7th Class Science Heat Question Bank

done Heat Total Questions - 118

• question_answer1)
  The direction of flow of heat is
  A)
  always from hotter body to a cooler body done clear
  B)
  always from cooler body to a hotter body. done clear
  C)
  always from a body at a lower temperature to a body at higher temperature done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer2)
  Which of the following devices is used for measurement of temperature of human body?
  A)
  Stethoscope done clear
  B)
  Clinical thermometer done clear
  C)
  Laboratory thermometer done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer3)
  The clinical thermometers presently in use in India are marked with a temperature scale. This scale corresponds to which of the following?
  A)
  Celsius             done clear
  B)
  Farenheit done clear
  C)
  Both (a) and (b)           done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer4)
  The normal temperature of human body is
  A)
   \[35{}^\circ C\]                                done clear
  B)
   \[37{}^\circ C\] done clear
  C)
   \[39{}^\circ C\]                                done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer5)
  The flow of heat by conduction is generally observed in case of
  A)
  solids               done clear
  B)
  liquids done clear
  C)
  gases                            done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer6)
  In which mode of heat transfer does the transfer of heat occur as a wave?
  A)
  Conduction                  done clear
  B)
  Convection done clear
  C)
  Radiation       done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer7)
  One feels sensation of heat when exposed to
  A)
  ultra violet rays            done clear
  B)
  infra-red rays done clear
  C)
  X-rays                          done clear
  D)
  gamma rays done clear
  View Solution play_arrow

• question_answer8)
  Which of the following is a good conductor of heat?
  A)
  Wood                           done clear
  B)
  Plastic done clear
  C)
  Aluminium      done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer9)
  In sea breeze
  A)
  cold air moves from sea towards land during day time done clear
  B)
  hot air moves from sea towards land during day time done clear
  C)
  cold air moves from land towards sea during day time done clear
  D)
  None of the above is correct done clear
  View Solution play_arrow

• question_answer10)
  In land breeze
  A)
  cold air moves from sea towards land during night. done clear
  B)
  hot air moves from sea towards land during night. done clear
  C)
  cold air moves from land towards sea during night. done clear
  D)
  None of the above is correct done clear
  View Solution play_arrow

• question_answer11)
  Mercury is generally used in thermometer because it has a
  A)
  high fluidity                  done clear
  B)
  high density done clear
  C)
  high conductivity         done clear
  D)
  high specific heat done clear
  View Solution play_arrow

• question_answer12)
  Nights are cooler in the deserts because
  A)
  sand radiates heat less quickly as compared to earth done clear
  B)
  the sky is generally clear done clear
  C)
  sand radiates heat more quickly as compared to earth done clear
  D)
  the sky is generally cloudy. done clear
  View Solution play_arrow

• question_answer13)
  Seema is in a hurry and wants her noodles to cool down faster. She should put it on a plate made of
  A)
  wood                           done clear
  B)
  paper done clear
  C)
  plastic                          done clear
  D)
  metal done clear
  View Solution play_arrow

• question_answer14)
  On a Fahrenheit scale
  A)
  Boiling point of water is \[212{}^\circ F\] done clear
  B)
  The temperature will be equal to that on the Celsius scale at \[-40{}^\circ C\] done clear
  C)
  The difference between the upper fixed point and the lower fixed point is divided into 180 equal parts done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer15)
  Expansion of a substance on heating depends on
  A)
  nature of the substance done clear
  B)
  rise in temperature done clear
  C)
  both A and B done clear
  D)
  color of the substance done clear
  View Solution play_arrow

• question_answer16)
  On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?
  A)
  On heating glass expands and lid contracts done clear
  B)
  Lid expands more than the neck and thus slides easily done clear
  C)
  Neck becomes slippery on heating done clear
  D)
  Lids of the bottles cannot bear the heat done clear
  View Solution play_arrow

• question_answer17)
  Process of change of state from gaseous state to liquid state is called
  A)
  freezing            done clear
  B)
  sublimation done clear
  C)
  boiling              done clear
  D)
  condensation done clear
  View Solution play_arrow

• question_answer18)
  When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at higher temperature to the body at lower temperature until them both acquire the same temperature. Assuming that there is no loss of heat to the surroundings, the heat
  A)
  gained by the hotter body will be equal to the heat lost by the colder body done clear
  B)
  the heat gained by the hotter body will be less than the heat lost by the colder body done clear
  C)
  the heat gained by the hotter body will be greater than the heat lost by the colder body done clear
  D)
  the heat lost by the hotter body will be equal to the heat gained by the colder body. done clear
  View Solution play_arrow

• question_answer19)
  We receive heat energy from the sun through ______ mode of transmission
  A)
  conduction      done clear
  B)
  convection done clear
  C)
  radiation         done clear
  D)
  yet to be found done clear
  View Solution play_arrow

• question_answer20)
  Conduction is possible
  A)
  when the bodies are apart from each other done clear
  B)
  when the bodies have same temperature and in thermal contact done clear
  C)
  when they have different temperatures maintaining distance between them done clear
  D)
  bodies should be in contact and should have different temperatures done clear
  View Solution play_arrow

• question_answer21)
  Cups are not made of metals. The reason is
  A)
  metals are good conductors done clear
  B)
  metals are bad conductors done clear
  C)
  metals are expensive done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer22)
  Which of the following statement(s) is/are correct?
  A)
  Temperature is a measure of total amount of heat contained in an object. done clear
  B)
  Temperature is a measure of degree of hotness or coldness of a body. done clear
  C)
  Both the above are correct done clear
  D)
  None of the above is correct done clear
  View Solution play_arrow

• question_answer23)
  It is a reliable measure of degree of hotness of an object. It is
  A)
  heat                             done clear
  B)
  temperature done clear
  C)
  Both of these                done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer24)
  The movement of cold air from sea towards land during daytime is called
  A)
  air breeze        done clear
  B)
  sea breeze done clear
  C)
  land breeze      done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer25)
  Why stainless steel pans are generally provided with copper bottoms?
  A)
  Copper bottom makes the pan more durable done clear
  B)
  Copper bottom makes the pan appear beautiful done clear
  C)
  Copper is a better conductor of heat than steel done clear
  D)
  Copper can be cleaned more easily as compared to steel done clear
  View Solution play_arrow

• question_answer26)
  In places of hot climate it is advised that the outer walls of houses be painted white.
  A)
  White color is good reflector. So the heat falling on the wall gets reflected and wall is not heated done clear
  B)
  White makes the wall look beautiful done clear
  C)
  Other colors will be expensive done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer27)
  What do you mean by heat?
  A)
  Heat is a measure of temperature. done clear
  B)
  Heat is a form of potential. done clear
  C)
  It is form of energy which gets transferred from a hot to a cold body. done clear
  D)
  None of the above. done clear
  View Solution play_arrow

• question_answer28)
  Which of the following pairs may give equal numerical values of the temperature of a body?
  A)
  Fahrenheit and Celsius done clear
  B)
  Celsius and Kelvin done clear
  C)
  Kelvin and Platinum done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer29)
  On which of the following scales of temperature, the temperature is never negative?
  A)
  Celsius                         done clear
  B)
  Fahrenheit done clear
  C)
  Reamer                        done clear
  D)
  Kelvin done clear
  View Solution play_arrow

• question_answer30)
  The smallest and old unit of heat energy is:
  A)
  Calorie     done clear
  B)
  Calorie done clear
  C)
  Joule                            done clear
  D)
  none of the above done clear
  View Solution play_arrow

• question_answer31)
  More is the difference in temperature of the bodies in contact:
  A)
  More is the rate of flow of heat from a body at a higher temperature to a body at lower temperature. done clear
  B)
  More is the rate of flow of heat from a body at a lower temperature to a body at higher temperature. done clear
  C)
  There is no change in the rate of flow of heat done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer32)
  Near coastal regions, the sea breeze blows:
  A)
  during day time only done clear
  B)
  during night time only done clear
  C)
  throughout the day and night done clear
  D)
  none of the above done clear
  View Solution play_arrow

• question_answer33)
  In a vacuum flask, which methods of heat transfer are prevented by the vacuum?
  A)
  Conduction only done clear
  B)
  Convection only done clear
  C)
  Conduction and convection only done clear
  D)
  Conduction, convection and radiation done clear
  View Solution play_arrow

• question_answer34)
  The device used to measure temperature of human body and is provided with a scale of temperature range\[35{}^\circ C\]to\[42{}^\circ C\]is called......
  A)
  Thermometer done clear
  B)
  Clinical thermometer done clear
  C)
  Laboratory thermometer done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer35)
  It is a mode of transfer of heat from one part of a substance to another part and in it there is no movement of the substance. This mode is
  A)
  Conduction    done clear
  B)
  Convection done clear
  C)
  Radiation                     done clear
  D)
  all of these done clear
  View Solution play_arrow

• question_answer36)
  Sea breeze refers to
  A)
  Cold air that moves from sea towards land during night time. done clear
  B)
  Cold air that moves from sea towards land during day time. done clear
  C)
  Both the above. done clear
  D)
  None of the above. done clear
  View Solution play_arrow

• question_answer37)
  The final temperature of a mixture of water obtained by mixing equal volumes of water at \[2{}^\circ C\] and\[4{}^\circ C\] will be
  A)
   \[1{}^\circ C\]                                  done clear
  B)
   \[2{}^\circ C\] done clear
  C)
   \[3{}^\circ C\]         done clear
  D)
   \[4{}^\circ C\] done clear
  View Solution play_arrow

• question_answer38)
  For a clinical thermometer we use a solid and a liquid. The liquid used in a clinical thermometer is
  A)
  a metal done clear
  B)
  a non-metal done clear
  C)
  neither a metal nor a non-metal done clear
  D)
  none of the above is correct done clear
  View Solution play_arrow

• question_answer39)
  Which of the following is an insulator?
  A)
  Wood                           done clear
  B)
  Plastic done clear
  C)
  Both of these     done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer40)
  DIRECTION: Match Column-I with Column-II and select the correct answer using the code given below the columns.  

  Column-I	Column-II
  (A) Summer	(p) Land breeze blows
  (B) Winter	(q) Sea breeze blows
  (C) Day	(r) Dark colored clothes are preferred
  (D) Night	(s) Light colored clothes are preferred

  A)
  A\[\to \] (s), B\[\to \] (r), C\[\to \] (q), D\[\to \] (p) done clear
  B)
  A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) done clear
  C)
  A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) done clear
  D)
  A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear
  View Solution play_arrow

• question_answer41)
  DIRECTION: Match Column-I with Column-II and select the correct answer using the code given below the columns.

  Column - I (Transfer of heat)	Column - II (Medium)
  (A) Conduction	(p) Black surface
  (B) Convection	(q) Vacuum
  (C) Radiation	(r) Air
  (D) Absorption	(s) A solid medium

  A)
  A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear
  B)
  A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear
  C)
  A\[\to \] (s), B\[\to \] (r), C\[\to \] (q), D\[\to \] (p) done clear
  D)
  A\[\to \] (s), B\[\to \] (p), C\[\to \] (r), D\[\to \] (q) done clear
  View Solution play_arrow

• question_answer42)
  DIRECTION: Match Column-I with Column-II and select the correct answer using the code given below the columns.

  Column - I	Column - II
  (A) Clinical thermo-meter	(p) Kink
  (B) Laboratory thermometer	(q) Scale marked in \[{}^\circ C\]
  (C) Steel	(r) Good conductor
  (D) Plastic	(s) Bad conductor

  A)
  A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) done clear
  B)
  A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) done clear
  C)
  A\[\to \] (q), B\[\to \] (p), C\[\to \] (s), D\[\to \] (r) done clear
  D)
  A\[\to \] (p), B\[\to \] (q), C\[\to \] (s), D\[\to \] (r) done clear
  View Solution play_arrow

• question_answer43)
  DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A clinical thermometer is used to measure the body temperature of human beings. It consists of a long, narrow, uniform glass tube. It has a bulb at one end. The bulb contains mercury. This thermometer read temperatures from \[35{}^\circ C\] to\[42{}^\circ C\]. A clinical thermometer can be used to measure the body temperature of human beings. A person suffering with fever is likely to show which of the following readings on this thermometer?
  A)
   \[35{}^\circ C\]                                done clear
  B)
   \[36{}^\circ C\] done clear
  C)
   \[37{}^\circ C\]                                done clear
  D)
   \[39{}^\circ C\] done clear
  View Solution play_arrow

• question_answer44)
  DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A clinical thermometer is used to measure the body temperature of human beings. It consists of a long, narrow, uniform glass tube. It has a bulb at one end. The bulb contains mercury. This thermometer read temperatures from \[35{}^\circ C\] to\[42{}^\circ C\]. What for is a clinical thermometer provided with a kink?
  A)
  To keep the mercury within the range of \[35{}^\circ C\]-\[42{}^\circ C\] done clear
  B)
  To allow the temperature reading to remain unchanged after the use of temperature until a jerk is given. done clear
  C)
  To make the thermometer size smaller. done clear
  D)
  All of the above are correct. done clear
  View Solution play_arrow

• question_answer45)
  DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A clinical thermometer is used to measure the body temperature of human beings. It consists of a long, narrow, uniform glass tube. It has a bulb at one end. The bulb contains mercury. This thermometer read temperatures from \[35{}^\circ C\] to\[42{}^\circ C\]. Which of the following precautions should be used while using a clinical thermometer?
  A)
  It should be washed before use. done clear
  B)
  It should be washed after use. done clear
  C)
  It should be washed preferably with some antiseptic. done clear
  D)
  All the above. done clear
  View Solution play_arrow

• question_answer46)
  DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 Light a candle. Keep one hand above the candle flame and one hand on the side of the flame. Do you feel any difference in degree of hotness felt by two hands? Which hand feels hot?
  A)
  The hand that was kept above the flame. done clear
  B)
  The hand that was kept on the side of the flame. done clear
  C)
  Both hands feel equally hot. done clear
  D)
  None of these is correct. done clear
  View Solution play_arrow

• question_answer47)
  DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 Light a candle. Keep one hand above the candle flame and one hand on the side of the flame. Do you feel any difference in degree of hotness felt by two hands? In this activity the mode of transference of heat is
  A)
  Conduction                  done clear
  B)
  convection done clear
  C)
  Radiation                     done clear
  D)
  none of these done clear
  View Solution play_arrow

• question_answer48)
  DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 Light a candle. Keep one hand above the candle flame and one hand on the side of the flame. Do you feel any difference in degree of hotness felt by two hands? How does the heat travel in air?
  A)
  The air near the heat source gets hot and rises. done clear
  B)
  The air from sides comes to take its place. done clear
  C)
  In this way air gets heated. done clear
  D)
  All the above are correct. done clear
  View Solution play_arrow

• question_answer49)
  DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Heat always flows from a larger object to a smaller object. Reason (R): Various modes by which heat can flow are conduction, convection and radiation.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer50)
  DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): When a body A at temperature \[50{}^\circ C\] is brought in contact with a body B at temperature \[30{}^\circ C,\] heat flows from the body 4 to the body B. Reason (R): Heat always flows from a body at a low temperature to a body at a high temperature.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer51)
  DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Sea breeze blows during daytime. Reason (R): The air above the sea is hot and moves toward land.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer52)
  DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Two bodies at the same temperature may contain different amounts of heat. Reason (R): Two bodies may require different amounts of heat to maintain or acquire same temperature.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer53)
  DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): The flow of heat energy from one body to the other depends upon the amount of heat energy in them. Reason (R): Heat flows from lower temperature of the body to higher temperature of the body.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer54)
  DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Temperature is a measure of degree of hotness of our body. Reason (R): We use a clinical thermometer to measure the degree of hotness of our body.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer55)
  DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): A clinical thermometer has a scale in the range of \[37{}^\circ C\] to\[45{}^\circ C\]. Reason (R): The normal temperature of human body is\[37{}^\circ C\].
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer56)
  DIRECTIONS: Read the following two statements carefully and choose the correct options. Statement 1: In a room containing air, heat can go from one place to another by radiation only. Statement 2: In conduction & convection, heat is transferred from one place to other by actual motion of heated material.
  A)
  Statement (1) is correct while statement (2) is incorrect. done clear
  B)
  Statement (2) is correct while statement (1) is incorrect. done clear
  C)
  Both statements are correct done clear
  D)
  Both statements are incorrect. done clear
  View Solution play_arrow

• question_answer57)
  DIRECTIONS: Read the following two statements carefully and choose the correct options. Statement 1: Radiation is a method of transfer of heat. Statement 2: The process of heat transfer that does not require any medium is called convection.
  A)
  Statement (1) is correct while statement (2) is incorrect. done clear
  B)
  Statement (2) is correct while statement (1) is incorrect. done clear
  C)
  Both statements are correct done clear
  D)
  Both statements are incorrect. done clear
  View Solution play_arrow

• question_answer58)
  DIRECTIONS: On the basis of following diagram/picture answer the questions given below: In the pictures shown below boxes are mad of different materials. These boxes are left in the open under the sun for an hour. After one hour which of these boxes will be hottest?
  A)
  (i)                                 done clear
  B)
  (ii) done clear
  C)
  (iii)                               done clear
  D)
  (iv) done clear
  View Solution play_arrow

• question_answer59)
  DIRECTIONS: On the basis of following diagram/picture answer the questions given below: The diagram shows a vacuum flask and an enlarged view of a section through the flask wall. The main reason for the silvering is to reduce heat transfer by
  A)
  conduction only done clear
  B)
  conduction and convection done clear
  C)
  radiation only done clear
  D)
  radiation and convection done clear
  View Solution play_arrow

• question_answer60)
  DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Four metal cans are identical except for the color and texture of their outer surfaces. \[100\text{ }c{{m}^{3}}\] of water at \[70{}^\circ C\] is poured into each can. Which can cools most rapidly?
  A)
  A                      done clear
  B)
  B done clear
  C)
  C                                 done clear
  D)
  D done clear
  View Solution play_arrow

• question_answer61)
  One litre of water at \[30{}^\circ C\] is mixed with one litre of water at\[50{}^\circ C\]. The temperature of the mixture will be
  A)
   \[80{}^\circ C\] done clear
  B)
  more than \[50{}^\circ C\] but less than \[80{}^\circ C\] done clear
  C)
   \[20{}^\circ C\] done clear
  D)
  between \[30{}^\circ C\] and \[50{}^\circ C\] done clear
  View Solution play_arrow

• question_answer62)
  Black objects are
  A)
  good absorbers and bad emitters of heat done clear
  B)
  good absorbers and good emitters of heat done clear
  C)
  bad absorbers and good emitters of heat done clear
  D)
  bad absorbers and bad emitters of heat done clear
  View Solution play_arrow

• question_answer63)
  Four identical kettles, having the same amount of water, have bases made of different metals of same thickness. If these kettles are placed on identical flames, water will boil first in the kettle the base of which is made of
  A)
  Stainless steel               done clear
  B)
  brass done clear
  C)
  Aluminum       done clear
  D)
  copper done clear
  View Solution play_arrow

• question_answer64)
  The glass tube used for construction of a thermometer should be
  A)
  long                              done clear
  B)
  narrow done clear
  C)
  uniform            done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer65)
  When a liquid in a beaker is heated on a gas burner
  A)
  Heated molecules become less dense and rise done clear
  B)
  Colder molecules from above move down and get heated done clear
  C)
  The heat is transferred by convection done clear
  D)
  All of these are correct done clear
  View Solution play_arrow

• question_answer66)
  Two laboratory thermometers are marked as 'A' and 'B'. The bulb of thermometer 'A' is wrapped in a white cloth and that of thermometer 'B' in black cloth. Both the thermometers are placed in sunlight for an hour. After one hour:
  A)
  Both the thermometers will read the same temperature done clear
  B)
  Thermometer 'A' will show higher temperature than 'B' done clear
  C)
  Thermometer 'B' will show higher temperature than 'A' done clear
  D)
  None of the above is correct. done clear
  View Solution play_arrow

• question_answer67)
  Which one of the following will not help to cool down a cup of hot tea?
  A)
  Stirring the contents of cup continuously done clear
  B)
  Adding a piece of ice to the cup of hot tea done clear
  C)
  Pouring the hot tea in a saucer done clear
  D)
  Adding more sugar to the cup of tea. done clear
  View Solution play_arrow

• question_answer68)
  A wooden spoon is dipped in a cup of ice cream. Its other end
  A)
  becomes cold by the process of conduction; done clear
  B)
  becomes cold by the process of convection; done clear
  C)
  becomes cold by the process of radiation; done clear
  D)
  does not become cold. done clear
  View Solution play_arrow

• question_answer69)
  In a car, radiator and fan are used to cool the engine. The heat transfer modes involved are
  A)
  conduction and convection done clear
  B)
  convection and radiation done clear
  C)
  conduction and radiation done clear
  D)
  conduction, convection and radiation done clear
  View Solution play_arrow

• question_answer70)
  The minimum possible temperature beyond which water cannot be cooled is
  A)
   \[-98.5{}^\circ C\]                done clear
  B)
   \[100{}^\circ C\] done clear
  C)
   \[-273.15{}^\circ C\]       done clear
  D)
   \[-469.5{}^\circ C\] done clear
  View Solution play_arrow

• question_answer71)
  Why are two blankets warmer than one?
  A)
  Two blankets have more wool and hence provide greater warmth. done clear
  B)
  Two blankets enclose air which does not allow the cold to penetrate. done clear
  C)
  Two blankets compress the air in between the body and the blankets and this compression produces heat. done clear
  D)
  None of these. done clear
  View Solution play_arrow

• question_answer72)
  The freezer in a refrigerator is fitted near the top
  A)
  To keep it away from the hot compressor which is near the bottom? done clear
  B)
  so that it can cool the whole interior by setting up convection currents done clear
  C)
  for the sake of convenience done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer73)
  We cannot use mercury thermometer at low temperatures because:
  A)
  glass might break down at low temperature done clear
  B)
  heat does not flow from the body whose measurement we are taking with the thermometer done clear
  C)
  at low temperatures mercury becomes transparent and it becomes difficult to take the readings done clear
  D)
  Mercury freezes at low temperatures done clear
  View Solution play_arrow

• question_answer74)
  Iron glows in red color when it is heated to very high temperature because:
  A)
  Heat we supply assumes red color at high temperature done clear
  B)
  Mechanical energy is being converted into heat energy done clear
  C)
  All me fats glow in red color when heated done clear
  D)
  Heat energy is being converted into light energy done clear
  View Solution play_arrow

• question_answer75)
  Gaps are left between railway tracks because:
  A)
  gaps give the space to the tracks to expand in summer heat done clear
  B)
  gaps hold the tracks firmly done clear
  C)
  to produce gentle rhythmic sound when the train moves on the track done clear
  D)
  it is customary to leave the gaps done clear
  View Solution play_arrow

• question_answer76)
  The temperature of the substance remains constant when it is melting and boiling though some quantity of heat is supplied. What happens to this energy?
  A)
  It is dissipated as sound energy done clear
  B)
  It is consumed to increase the energy of the molecules done clear
  C)
  It is used to change the state of the substance done clear
  D)
  It is still an unsolved problem in science done clear
  View Solution play_arrow

• question_answer77)
  A coin is dipped in the molten wax in a glass tube. When we heat the upper part of the glass tube, the wax around the coin will not melt because:
  A)
  wax has a very high melting point done clear
  B)
  wax is a good conductor of heat done clear
  C)
  glass is a good conductor of heat done clear
  D)
  wax and glass are bad conductors done clear
  View Solution play_arrow

• question_answer78)
  Rooms are fitted with ventilators to let the air move around. The phenomenon involved is:
  A)
  conduction                   done clear
  B)
  convection done clear
  C)
  radiation         done clear
  D)
  condensation done clear
  View Solution play_arrow

• question_answer79)
  Reflecting solar films are used on the top of the cars to:
  A)
  produce electricity done clear
  B)
  to absorb more light done clear
  C)
  to prevent heating by radiation done clear
  D)
  to make to strong done clear
  View Solution play_arrow

• question_answer80)
  Which of the following is correct?
  A)
  We can easily find the degree of hotness of a body by using the sense of touch. done clear
  B)
  We prefer to wear white clothes made of cotton during winter because cotton is a bad conductor of heat. done clear
  C)
  The thermometer that we use to measure body temperature is called clinical thermometer. done clear
  D)
  All the above are correct done clear
  View Solution play_arrow

• question_answer81)
  Which of the following is correct?
  A)
  The range of clinical thermometer is \[35{}^\circ C~-\,45{}^\circ C\] done clear
  B)
  The normal body temperature of human body is \[39{}^\circ C.\] done clear
  C)
  Heat flows from a body containing larger amount of heat to a body containing lesser amount of heat. done clear
  D)
  All the above are correct. done clear
  View Solution play_arrow

• question_answer82)
  Why does a clinical thermometer have a range of\[35{}^\circ C-42{}^\circ C\]?
  A)
  To keep its size compact done clear
  B)
  The temperature of human body can normally fluctuate between these two extreme ranges of lower and higher temperatures. done clear
  C)
  Both the above. done clear
  D)
  None of these. done clear
  View Solution play_arrow

• question_answer83)
  In which case rate of flow of heat form P to Q is least:
  A)
   \[P-100{}^\circ C,\] \[Q-40{}^\circ C\]      done clear
  B)
   \[P-90{}^\circ C,\] \[Q-10{}^\circ C\] done clear
  C)
   \[P-50{}^\circ C,\] \[Q-10{}^\circ C\]        done clear
  D)
   \[P-60{}^\circ C,\] \[Q-50{}^\circ C\] done clear
  View Solution play_arrow

• question_answer84)
  A body P at a higher temperature is placed in contact with another body Q at lower temperature, till an equilibrium stage is reached. At this stage:
  A)
  the heat will stop flowing from P to Q done clear
  B)
  the heat will stop flowing from Q to P done clear
  C)
  the heat continue flowing from P to Q and vice versa done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer85)
  Two bodies P and Q are in contact with each other, such that P is at a higher temperature than Q. When equilibrium temperature is reached "X" units of heat energy is given by the body P. The heat energy received by the body Q is:
  A)
  More than X                 done clear
  B)
  Less than X done clear
  C)
  Equal to X       done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer86)
  The land breeze blows from land to sea in coastal regions, because, the land:
  A)
  cools slowly as compared to seawater done clear
  B)
  cools rapidly as compared to seawater done clear
  C)
  cools at the same rate as seawater done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer87)
  A fan produces a feeling of comfort because
  A)
  a fan supplies cool air done clear
  B)
  the evaporation of sweat done clear
  C)
  fan increases the humidity in air done clear
  D)
  fan decreases the humidity in air done clear
  View Solution play_arrow

• question_answer88)
  Which of the following statement is true?
  A)
  Metal are bad conductors done clear
  B)
  In gases, heat is transferred by conduction done clear
  C)
  In conduction, molecules move from hotter to colder parts transmitting energy. done clear
  D)
  Metals conduct heat better than the gases done clear
  View Solution play_arrow

• question_answer89)
  Good absorbers of heat are
  A)
  Poor emitters               done clear
  B)
  non-emitters done clear
  C)
  Good emitters      done clear
  D)
  highly polished done clear
  View Solution play_arrow

• question_answer90)
  The temperature of the sun is measured with
  A)
  Platinum thermometer done clear
  B)
  Gas thermometer done clear
  C)
  Pyrometer done clear
  D)
  Vapor pressure thermometer done clear
  View Solution play_arrow

• question_answer91)
  Temperature is a
  A)
  microscopic concept done clear
  B)
  macroscopic concept done clear
  C)
  space-time concept done clear
  D)
  none of the above done clear
  View Solution play_arrow

• question_answer92)
  How is heat transferred through the base of a metal saucepan?
  A)
  by conduction only done clear
  B)
  by radiation only done clear
  C)
  by conduction and convection done clear
  D)
  by convection and radiation done clear
  View Solution play_arrow

• question_answer93)
  Why do we wear woolen clothes in winter?
  A)
  Wool is a poor conductor of heat done clear
  B)
  Wool is a good conductor of heat done clear
  C)
  Both the above are correct done clear
  D)
  None of the above is correct done clear
  View Solution play_arrow

• question_answer94)
  Why stainless steel pans are generally provided with copper bottoms?
  A)
  Copper bottom makes the pan more durable done clear
  B)
  Copper bottom makes the pan appear beautiful done clear
  C)
  Copper is a better conductor of heat than steel done clear
  D)
  Copper can be learned more easily as compared to steel done clear
  View Solution play_arrow

• question_answer95)
  In the process of flow of heat by conduction
  A)
  There is no movement of the substance done clear
  B)
  The heat transfer takes place from higher temperature part of body to lower temperature part of body done clear
  C)
  Occurs when one end of an iron rod is heated on a burner done clear
  D)
  All the above are correct done clear
  View Solution play_arrow

• question_answer96)
  Suppose we take two identical size rods (one wooden rod and another iron rod) and wrap each one of them in a piece of paper, and heat, these rods with a candle flame. On being heated, the paper around the iron rod does not bum but the one around wooden rod catches fire. Which of the following is the possible reason for this?
  A)
  Iron being a good conductor, conducts away heat given to paper. done clear
  B)
  Wood being an insulator, takes away all the heat. done clear
  C)
  In case of iron rod, the candle is near the paper. done clear
  D)
  Paper around iron rod is thicker. done clear
  View Solution play_arrow

• question_answer97)
  DIRECTION: Match column-I with Column-II and select the correct answer using the code given below the columns.  

  Column - I	Column - II
  (A) Range of clinical thermometer	(p) \[\text{35 }\!\!{}^\circ\!\!\text{ C}\,\,\text{to 42}{}^\circ \text{C}\]
  (B) Range of Laboratory thermometer	(q) \[-10{}^\circ C\]to \[110{}^\circ C\]
  (C) Normal body temperature	(r) \[37{}^\circ C\]
  (D) A liquid metal	(s) Mercury

  A)
  A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s). done clear
  B)
  A\[\to \] (q), B\[\to \] (r), C\[\to \] (s), D\[\to \] (p) done clear
  C)
  A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear
  D)
  A\[\to \] (s), B\[\to \] (p), C\[\to \] (q), D\[\to \] (r) done clear
  View Solution play_arrow

• question_answer98)
  DIRECTION: Match column-I with Column-II and select the correct answer using the code given below the columns.

  Column - I	Column - II
  (A) Melting	(p) Solid to gas
  (B) Sublimation	(q) Solid to liquid
  (C) Condensation	(r) Gas to liquid
  (D) Vaporization	(s) Liquid to gas

  A)
  A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) done clear
  B)
  A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) done clear
  C)
  A\[\to \] (s), B\[\to \] (p), C\[\to \] (q), D\[\to \] (r) done clear
  D)
  A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear
  View Solution play_arrow

• question_answer99)
  DIRECTIONS: Read the passage given below an answer the questions that follow. Passage - 1 Substances that conduct heat very well are called good conductors of heat or thermal conductors. All the metals such as silver, copper, aluminum, iron, mercury and metal alloys such as brass, steel and stainless steel are good conductors of heat. Though all the metals are good conductors of heat, some metals are better conductors of heat than the others. Among metals, silver metal is the best conductor of heat, next is copper and lowest is lead. Substances that do not conduct heat very welfare called bad conductors or poor conductors or insulators of heat. Some of the examples of heat or thermal insulators are plastic, wood, paper, cloth, thermocol, rubber, etc. Liquids like water are poor conductors and gases are very poor conductors of heat. Thus, air is a very good insulator of heat. It is observed that when glass is heated, it cracks while metal does not. Which of the following statements explain this phenomenon?
  A)
  Metal is a poor conductor of heat. done clear
  B)
  The expansion of the glass after heating is uniform and therefore it cracks. done clear
  C)
  In case of glass the heat is transmitted quickly when heated. done clear
  D)
  Glass is a poor conductor of heat. done clear
  View Solution play_arrow

• question_answer100)
  DIRECTIONS: Read the passage given below an answer the questions that follow. Passage - 1 Substances that conduct heat very well are called good conductors of heat or thermal conductors. All the metals such as silver, copper, aluminum, iron, mercury and metal alloys such as brass, steel and stainless steel are good conductors of heat. Though all the metals are good conductors of heat, some metals are better conductors of heat than the others. Among metals, silver metal is the best conductor of heat, next is copper and lowest is lead. Substances that do not conduct heat very welfare called bad conductors or poor conductors or insulators of heat. Some of the examples of heat or thermal insulators are plastic, wood, paper, cloth, thermocol, rubber, etc. Liquids like water are poor conductors and gases are very poor conductors of heat. Thus, air is a very good insulator of heat. Which of the following is the best insulator of heat?
  A)
  air                done clear
  B)
  silver done clear
  C)
  iron                              done clear
  D)
  water done clear
  View Solution play_arrow

• question_answer101)
  DIRECTIONS: Read the passage given below an answer the questions that follow. Passage - 1 Substances that conduct heat very well are called good conductors of heat or thermal conductors. All the metals such as silver, copper, aluminum, iron, mercury and metal alloys such as brass, steel and stainless steel are good conductors of heat. Though all the metals are good conductors of heat, some metals are better conductors of heat than the others. Among metals, silver metal is the best conductor of heat, next is copper and lowest is lead. Substances that do not conduct heat very welfare called bad conductors or poor conductors or insulators of heat. Some of the examples of heat or thermal insulators are plastic, wood, paper, cloth, thermocol, rubber, etc. Liquids like water are poor conductors and gases are very poor conductors of heat. Thus, air is a very good insulator of heat. When we touch a steel rod and a paper simultaneously, we feel that the rod is colder because:
  A)
  Iron being a good conductor conducts more heat from our body done clear
  B)
  Paper being a good conductor conducts more heat from our body done clear
  C)
  More heat flows from the iron to our body done clear
  D)
  More heat flows from the paper to our body done clear
  View Solution play_arrow

• question_answer102)
  DIRECTIONS: Read the passage given below an answer the questions that follow. Passage ? 2 The thermometers showed the temperature of the water in cup A and cup B at the beginning of a heat-flow experiment. Over the next 15 minutes, which changes would most likely occur?
  A)
  The temperature in cup A will decrease and the temperature in cup B will increase. done clear
  B)
  The temperature in cup A will decrease and the temperature in cup B will decrease. done clear
  C)
  The temperature in cup A will increase and the temperature in cup B will increase. done clear
  D)
  The temperature in cup A will increase and the temperature in cup B will decrease. done clear
  View Solution play_arrow

• question_answer103)
  DIRECTIONS: Read the passage given below an answer the questions that follow. Passage ? 2 The thermometers showed the temperature of the water in cup A and cup B at the beginning of a heat-flow experiment. Which process is most responsible for the temperature changes that will take place?
  A)
  Radiation of heat from the water in the cups to the thermometers done clear
  B)
  Conduction of heat through the aluminum bar done clear
  C)
  Radiation of heat from the water in the cups into the air done clear
  D)
  Conduction of heat through the air to the Water in the cups done clear
  View Solution play_arrow

• question_answer104)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Glass tumbler breaks in winter when hot water is poured to it. Reason (R): When hot water is poured, the outer surface of glass expands.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer105)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Temperature decreases with increasing height above sea level. Reason (R): Atmosphere is mainly heated by conduction from the earth.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer106)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): The temperature of a body is\[10{}^\circ C\]. Its temperature in Fahrenheit scale is\[50{}^\circ F\]. Reason (R): Celsius (C) and Fahrenheit (F) are related as \[F=\frac{9}{5}C+32\]
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer107)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Land and sea breezes are caused in coastal regions. Reason (R): The specific heat of land is about 4 times less than sea water.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer108)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Two bodies at different temperatures, if brought in thermal contact do not necessary settle to the mean temperature. Reason (R): The two bodies may have different thermal capacities.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer109)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): A brass tumbler feels much colder than a wooden tray on a chilly day. Reason (R): The ability to conduct heat of brass is less than that of wood.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer110)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Snow is better insulator than ice. Reason (R): Snow contain air packet and air is good insulator of heat.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer111)
  DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Sea breeze refers to the movement of cold air from sea towards land during day time. Reason (R): Land breeze refers to the movement of cold air from land towards sea during night time.
  A)
  Both A and R are true and R is the correct explanation of A. done clear
  B)
  Both A and R are true but R is not the correct explanation of A. done clear
  C)
  A is true but R is false. done clear
  D)
  A is false but R is true. done clear
  View Solution play_arrow

• question_answer112)
  DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement-1: Room heaters and refrigerators lose most of their heat by convection. Statement-2: A hot surface heat the air next to it. The hot air rises, to be replaced by cooler air which then heat, and so on. Statement-3: Radiation is a method of transfer of heat.
  A)
  Statement (1) and (3) are incorrect while statement (2) is correct. done clear
  B)
  Statement (1) and (2) are incorrect while (3) is correct. done clear
  C)
  All the statements are correct. done clear
  D)
  All the statements are incorrect. done clear
  View Solution play_arrow

• question_answer113)
  DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement-1: The bulb of one thermometer is spherical while that of the other is cylindrical. Both have equal amount of mercury. The response of the cylindrical bulb thermometer will be quicker. Statement-2: Heat conduction in a body is directly proportional to cross-sectional area. Statement-3: The range of clinical thermometer is \[35{}^\circ C\] to \[42{}^\circ C\]
  A)
  Statement (1) and (3) are incorrect while statement (2) is correct. done clear
  B)
  Statement (1) and (2) are incorrect while (3) is correct. done clear
  C)
  All the statements are correct. done clear
  D)
  All the statements are incorrect. done clear
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• question_answer114)
  DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Consider the figures of a metal ball and a metal ring given below: The metal ball can just pass through the hole of a metal ring formed out of a strip. When the ball is heated it gets stuck. But when the metal ring is heated.
  A)
  The ball will not pass through because there is no change in the ring. done clear
  B)
  The ball can now pass through it because the ring diameter expands on heating. done clear
  C)
  The ball gets stuck because the diameter of the hole decreases on expansion. done clear
  D)
  None of the above done clear
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• question_answer115)
  DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: The figure shows air-filled bulbs connected by a U-tube partly filled with alcohol. What happens to the levels of alcohol in the limbs X and Y when an electric bulb is placed midway between the painted air filled bulbs and electric bulb is lighted?
  A)
  The level of alcohol falls in both limbs. done clear
  B)
  The level of alcohol in the limb X rises while that in limb Y falls. done clear
  C)
  The level of alcohol in limb X falls while that in limb Y rises. done clear
  D)
  There is no change in the levels of alcohol in the two limbs. done clear
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• question_answer116)
  DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Carefully study the pictures shown below In picture (i) it is shown a hand dipping in ice cold water and in picture (iii) it is shown another hand dipping in hot water. In picture (ii) shown two hands being taken out from ice cold water and hot water and then dipped simultaneously in water at room temperature. Which of the following statement(s) is/are correct?
  A)
  Both hands give the same feeling about hotness of water to both the hands. done clear
  B)
  The hand taken out from ice cold water will tell that the water in (ii) is hot while the other hand will tell the water in (ii) is cold. done clear
  C)
  The hand taken out from ice cold water will tell that the water in (ii) is cold while the other hand will tell that water in (ii) is hot. done clear
  D)
  None of the above is correct. done clear
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• question_answer117)
  DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: Four beakers given below contain same liquid. Which of the following beakers contain the more amount of heat energy? (A)          (B) (C)         (D)
  A)
  A                                  done clear
  B)
  B done clear
  C)
  C                     done clear
  D)
  D done clear
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• question_answer118)
  DIRECTIONS: On the basis of following diagram/ picture answer the questions given below: A cook makes the pudding 'baked Alaska'. The pudding is placed in a very hot oven until the top of the egg whites turns brown. It is then removed from the oven. Why does the ice-cream stay cold?
  A)
  Air is a good conductor of heat and conducts the heat away from the ice cream. done clear
  B)
  Air is a poor conductor of heat and stops the heat from reaching the ice cream. done clear
  C)
  The metal dish is a good conductor of heat and conducts the heat away from the ice cream. done clear
  D)
  The metal dish is a poor conductor of heat and stops the heat from reaching the ice cream. done clear
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