UPSC Physics Heat Question Bank

done Sound, Oscillations, Heat and Thermodynamics Total Questions - 57

• question_answer1)
  In SONAR, we use                                  [CDS]
  A)
  ultrasonic waves done clear
  B)
  infrasonic waves done clear
  C)
  radio waves done clear
  D)
  audible sound waves  done clear
  View Solution play_arrow

• question_answer2)
                                     An oscilloscope is an instrument which allows us to see waves produced by                             [CDS]
  A)
  Visible light done clear
  B)
       X-rays done clear
  C)
  Sound       done clear
  D)
       Gamma rays done clear
  View Solution play_arrow

• question_answer3)
        The sound travels fastest in
  A)
  solids                 done clear
  B)
       liquids done clear
  C)
  gases                 done clear
  D)
       none of these done clear
  View Solution play_arrow

• question_answer4)
       

  Two identical piano wires have same fundamental frequency when kept under the same tension.

  What will happen if tension of one of the wire is slightly increased and both the wires are made to vibrate simultaneously?                                    [CDS]
  A)
  Noise                 done clear
  B)
       Beats done clear
  C)
  Resonance done clear
  D)
       Non-linear effects done clear
  View Solution play_arrow

• question_answer5)
        The turntable of a gramophone is rotated at a constant speed of x revolutions/minute. Which one of the following values of the revolutions per minute is not used?                                    [NDA]
  A)
  78 r.p.m.           done clear
  B)
       56 r.p.m. done clear
  C)
  45 r.p.m.           done clear
  D)
       33 r.p.m. done clear
  View Solution play_arrow

• question_answer6)
        Why is sound heard with more intensity through \[C{{O}_{2}}\] than through the air?                                    [NDA]
  A)
  Density of \[C{{O}_{2}}\] is more than that of air done clear
  B)
  Density of \[C{{O}_{2}}\] is less than that of air done clear
  C)
  Air is bad conductor of heat done clear
  D)
  \[C{{O}_{2}}\] is a compound, but air is a mixture of gases. done clear
  View Solution play_arrow

• question_answer7)
        Which one of the following properties distinguishes ultrasound from normal audible sound?                               [NDA]
  A)
  Intensity            done clear
  B)
       Speed of propagation done clear
  C)
  Frequency done clear
  D)
  Quality done clear
  View Solution play_arrow

• question_answer8)
       

  Consider the following statements:

  If the same note is played on a flute and a sitar, one can still distinguish between them because they differ in                              [NDA]

  1. frequency

  2. intensity

  3. quality

  Which of the statements given above is/are correct?
  A)
  1 and only       done clear
  B)
      2 and 3 only done clear
  C)
  3 only        done clear
  D)
       2 only done clear
  View Solution play_arrow

• question_answer9)
       

  Consider the following statements:

  Sound waves can undergo                                    [NDA]

  1. reflection

  2. refraction

  3.  interference

  A)
  1 and 2 only      done clear
  B)
       2 and 3 only done clear
  C)
  1 and 3 only      done clear
  D)
       1, 2 and 3 done clear
  View Solution play_arrow

• question_answer10)
        Consider the following parts of spectra                               [NDA]

  1. Visible

  2. Infrared

  3. Ultraviolet

  4. Microwave

  Which one of the following is the correct sequence in which their wavelengths increase?
  A)
  \[4-3-1-2\]          done clear
  B)
       \[4-1-2-3\] done clear
  C)
  \[3-2-1-4\]                      done clear
  D)
  \[3-1-2-4\] done clear
  View Solution play_arrow

• question_answer11)
        In a sitar wire which one of the following types of vibration is produced?                                 [NDA]
  A)
  Progressive longitudinal done clear
  B)
  Stationary longitudinal done clear
  C)
  Progressive transverse done clear
  D)
  Stationary transverse done clear
  View Solution play_arrow

• question_answer12)
        Which one of the following is not electromagnetic in nature?                         [NDA]
  A)
  Cathode-rays     done clear
  B)
       X-rays done clear
  C)
  Gamma-rays      done clear
  D)
       Infrared-rays done clear
  View Solution play_arrow

• question_answer13)
  'Pitch' is a characteristic of sound that depends upon its [NDA]
  A)
  intensity done clear
  B)
  frequency done clear
  C)
  quality               done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer14)
        Timbre is called the quality of sound. One can recognise the voice of a familiar human being or instrument without actually seeing them. This quality is associated with
  A)
  material of the body done clear
  B)
  overtones present in the sound done clear
  C)
  shape of the body done clear
  D)
  all of the above done clear
  View Solution play_arrow

• question_answer15)
  Match the column - I and Column - II.

  	Column-I		Column-II
  A.	Audible range in humans	P.	greater than 20,000 Hz
  B.	Ultrasonic waves	Q	20 Hz - 20,000 Hz
  C.	Infrasonic waves	R.	1498 m/s
  D.	Speed of sound in water (distilled)	S.	343.2m/s
  E.	Speed of sound in air	T.	less than 20 Hz

   
  A)
  A-Q;   B-P;   C-T;   D-S;   E-R done clear
  B)
  A-Q;   B-P;   C-T;   D-R;   E-S done clear
  C)
  A-P;   B-Q;   C-T;   D-R;   E-S done clear
  D)
  A-Q;   B-T;   C-P;   D-R;   E-S done clear
  View Solution play_arrow

• question_answer16)
        Suppose a tunnel is dug along a diameter of the earth. A particle is dropped from a point, a distance h directly above the tunnel, the motion of the particle is
  A)
  simple harmonic  done clear
  B)
       parabolic done clear
  C)
  oscillatory  done clear
  D)
       non-periodic done clear
  View Solution play_arrow

• question_answer17)
        Which one of the following types of waves are used in a night vision apparatus?                                  [IAS Prelim]
  A)
  Radio waves      done clear
  B)
       Microwaves done clear
  C)
  Infra-red waves   done clear
  D)
       None of the above done clear
  View Solution play_arrow

• question_answer18)
        Figure given above shows the part of a long string in which transverse waves are produced. Which pair of points is in phase?                                    [NDA]
  A)
  A and E             done clear
  B)
       B and J done clear
  C)
  D and J             done clear
  D)
       C and G done clear
  View Solution play_arrow

• question_answer19)
        Consider the following statements with reference to observations made by an astronaut on the surface of moon:

  1. The astronaut finds that a simple pendulum continues to oscillate for a much longer time, than that on the earth.

  2. No atmosphere exists there.

  Which of the statements given above is/are correct?                         [NDA]
  A)
  Only 1 done clear
  B)
       Only 2 done clear
  C)
  Both 1 and 2      done clear
  D)
       Neither 1 nor 2 done clear
  View Solution play_arrow

• question_answer20)
        If the length of second's pendulum is increased by 2%, how many seconds will it lose per day?                          [NDA]
  A)
  3600 s               done clear
  B)
       3456 s done clear
  C)
  1728 s               done clear
  D)
       846 s done clear
  View Solution play_arrow

• question_answer21)
  A man standing between two parallel hills fires a gun and hears two echoes, one 2.5 s and the other 3.5 s after the firing. If the velocity of sound is \[330\,\,m{{s}^{-1}}\], how long will it take him to hear the third echo? [NDA]
  A)
  4 s                    done clear
  B)
  5 s done clear
  C)
  6 s                     done clear
  D)
  8 s done clear
  View Solution play_arrow

• question_answer22)
        The simple harmonic motion of a particle is given by y = 3 sin \[\omega \,t\]+ 4 cos\[\omega \,t\]. Which one of the following is the amplitude of this motion?                            [NDA]
  A)
  1                      done clear
  B)
       5 done clear
  C)
  7                      done clear
  D)
       12 done clear
  View Solution play_arrow

• question_answer23)
        The standing wave pattern along a string of length 60 cm is shown in the above diagram. If the speed of the transverse waves on this string is 300 m/s, in which one of the following modes is the string vibrating?                             [NDA]
  A)
  Fundamental       done clear
  B)
      First overtone      done clear
  C)
        Second overtone done clear
  D)
      Third overtone done clear
  View Solution play_arrow

• question_answer24)
        A sonometer wire having a length of 50 cm is vibrating in the fundamental mode with a frequency of 100 Hz. Which of the following is the type of propagating wave and its speed?                               [NDA]
  A)
  Longitudinal, 50 m/s       done clear
  B)
  Transverse, 50 m/s done clear
  C)
  Longitudinal, 100 m/s      done clear
  D)
  Transverse, 100 m/s done clear
  View Solution play_arrow

• question_answer25)
        The Visible light has a wavelength range from about 380 nm (violet) to 780 nm (red). If an excited object emits light with wavelength of 15 nm, to which one of the following ranges does it belongs?                            [NDA]
  A)
  X-ray                done clear
  B)
       Gamma ray done clear
  C)
  Infrared             done clear
  D)
       Ultraviolet done clear
  View Solution play_arrow

• question_answer26)
        Which one among the following statements is not correct?                            [NDA]
  A)
  In progressive waves, the amplitude may be constant and neighbouring points are out of phase with each other done clear
  B)
  In air or other gases, a progressive antinode occurs at a displacement node and a progressive node occurs at a displacement antinode done clear
  C)
  Transverse wave can be polarised while longitudinal wave cannot be polarised done clear
  D)
  Longitudinal wave can be polarised while transverse wave cannot be polarised done clear
  View Solution play_arrow

• question_answer27)
        Sound moves with higher velocity if                                   [NDA]
  A)
  pressure of the medium is decreased done clear
  B)
  temperature of the medium is increased done clear
  C)
  humidity of the medium is increased done clear
  D)
  Both [b] and [c] above done clear
  View Solution play_arrow

• question_answer28)
        Bats can ascertain distance, directions, nature and size of the obstacles at night. This is possible by reflection of the emitted                                    [NDA]
  A)
  ultrasonic waves from the bat done clear
  B)
  ultrasonic waves from the distant objects done clear
  C)
  supersonic waves from the bat done clear
  D)
  supersonic waves from the distant objects done clear
  View Solution play_arrow

• question_answer29)
        The regions of compressions and rare fractions of sound wave are-established because
  A)
  the sound wave undergoes diffraction behind obstacles done clear
  B)
  the reflected sound wave at fixed end interferes with the incident wave done clear
  C)
  the longitudinal movement of air molecules produce pressure fluctuations done clear
  D)
  the speed of the sound wave changes as it travels through a medium done clear
  View Solution play_arrow

• question_answer30)
       

  Assertion [A]: A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near the sea level.

  Reason [R]: The velocity of sound depends on the temperature of the surrounding medium. [IAS Prelim]

  A)
  Both A are R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is not a 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_answer31)
       

  Assertion [A]: Radio waves bend in a magnetic field.

  Reason [R]: Radio waves are electromagnetic in nature. [IAS Prelim]

  A)
  Both A are R are true and R is the correct explanation of A done clear
  B)
  Both A and R are true but R is not a 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_answer32)
        The sound from an open pipe is more pleasant than the sound from a closed pipe. This is because:
  A)
  sound is heard from both the sides of an open pipe done clear
  B)
  there are more overtone combinations in an open pipe than in a closed one done clear
  C)
  it is very easy to operate an open pipe done clear
  D)
  the length of the open pipe is shorter done clear
  View Solution play_arrow

• question_answer33)
        Which one of the following is the mode of heat transfer in which warm material is transported so as to displace a cooler material?                                   [NDA]
  A)
  Conduction only done clear
  B)
  Convection only done clear
  C)
  Radiation done clear
  D)
  Both conduction and convection done clear
  View Solution play_arrow

• question_answer34)
        Low temperatures (cryogenics) find application in:                           [IAS Prelim]
  A)
  space travel, surgery and magnetic levitation done clear
  B)
  surgery, magnetic levitation and telemetry done clear
  C)
  space travel, surgery and telemetry done clear
  D)
  space travel, magnetic levitation and telemetry done clear
  View Solution play_arrow

• question_answer35)
        Which zone of a candle flame is the hottest?                                   [NDA]
  A)
  Dark innermost zone done clear
  B)
  Outermost zone done clear
  C)
  Middle luminous zone done clear
  D)
  Central zone done clear
  View Solution play_arrow

• question_answer36)
        Which one among the following denotes the smallest temperature?                             [NDA]
  A)
  \[1{}^\circ \] on the Celsius scale done clear
  B)
  \[1{}^\circ \] on the Kelvin scale done clear
  C)
  \[1{}^\circ \] on the Fahrenheit scale done clear
  D)
  \[1{}^\circ \] on the Reaumur scale done clear
  View Solution play_arrow

• question_answer37)
       

  Assertion [A]: Steam is more harmful for human body than the boiling water in case of bum.

  Reason [R]: Boiling water contains more heat than steam. [CDS]

  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_answer38)
       

  Assertion [A]: In a pressure cooker food is cooked above boiling point.

  Reason [R]: Boiling point of water increases as the pressure increases. [CDS]

  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_answer39)
        Strips of two metals A and B are firmly jointed together as shown in the figure.                                   [IAS Prelim] On heating, A expands more than B does. If this jointed strip is heated, then it will appear as
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
           done clear
  View Solution play_arrow

• question_answer40)
        Which one among the following statements about thermal conductivity is correct?                               [NDA]
  A)
  Steel > Wood > Water done clear
  B)
  Steel > Water > Wood done clear
  C)
  Water > Steel > Wood done clear
  D)
  Water > Wood > Steel done clear
  View Solution play_arrow

• question_answer41)
        Cloudy nights are warmer compared to clear cloudless nights, because clouds:                         [IAS Prelim]
  A)
  prevent clod waves from the sky from descending on earth done clear
  B)
  reflect back the heat given off by earth done clear
  C)
  produce heat and radiate it towards earth done clear
  D)
  absorb heat from the atmosphere and send it towards earth done clear
  View Solution play_arrow

• question_answer42)
        A solid is melted (above the melting point) and allowed to cool down at normal condition. Its variation of temperature as a function of times is as shown in the figure given below. What is the reason for the plateau (flat position) in the central region of the cooling curve as shown in the figure?                            [NDA]
  A)
  Latent heat of fusion of the solid done clear
  B)
  Specific heat of the solid done clear
  C)
  Thermal conductivity of the solid done clear
  D)
  Thermal capacity of the solid. done clear
  View Solution play_arrow

• question_answer43)
        If the door of a running refrigerator in a closed room is kept open, what will be the net effect on the room?                                  [CDS]
  A)
  It will cool the room done clear
  B)
  It will heat the room done clear
  C)
  It will make no difference on the average done clear
  D)
  It will make the temperature go up and down done clear
  View Solution play_arrow

• question_answer44)
        The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?                               [IAS Prelim]
  A)
  Ice is a bad conductor of heat. done clear
  B)
  Since the surface of the lake is at the same temperature as the air, no heat is lost. done clear
  C)
  The density of water is maximum at \[4{}^\circ C\]. done clear
  D)
  None of the statements [a], [b] and [c] given is correct. done clear
  View Solution play_arrow

• question_answer45)
        Which of the following properties are most desirable for a cooking pot?                                   [NDA]
  A)
  High specific heat capacity and low conductivity done clear
  B)
  Low specific heat capacity and high conductivity done clear
  C)
  High specific heat capacity and high conductivity done clear
  D)
  Low specific heat capacity and low conductivity done clear
  View Solution play_arrow

• question_answer46)
        The graph given above indicates change in temperature (\[\Delta t\]) when heat (\[Q\]) was given to a substance. Which among the following parts of the graph correctly depict the latent heat of the substance?                                 [NDA]
  A)
  AB and BC                    done clear
  B)
  BC and DE done clear
  C)
  CD and DE done clear
  D)
       DE and AB done clear
  View Solution play_arrow

• question_answer47)
        Consider the following statements:                         [CDS]

  1. Steam at \[100{}^\circ C\] and boiling water at \[100{}^\circ C\] contain same amount of heat.

  2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water.

  3. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected out at the condenser coils.

  Which of these statements is/are correct?
  A)
  1 and 2                         done clear
  B)
  2 and 3 done clear
  C)
  Only 2               done clear
  D)
       Only 3 done clear
  View Solution play_arrow

• question_answer48)
        Mr X was advised by an architect to make outer walls of his house with hollow bricks. The correct reason is that such walls                                    [CDS]
  A)
  make the building stronger done clear
  B)
  help keeping inside cooler in summer and warmer in winter done clear
  C)
  prevent seepage of moisture from outside done clear
  D)
  protect the building from lightning done clear
  View Solution play_arrow

• question_answer49)
        Why are inner lining of hot water geysers made up of copper?                                   [CDS]
  A)
  Copper has low heat capacity done clear
  B)
  Copper has high electrical conductivity done clear
  C)
  Copper does not react with steam done clear
  D)
  Copper is good conductor of both heat and electricity done clear
  View Solution play_arrow

• question_answer50)
        A Centigrade thermometer and Fahrenheit thermometer are dipped in boiling water. The temperature of water is lowered till the Fahrenheit thermometer registers half of its upper fixed point. What is the corresponding fall temperature registered by the Centrigrade thermometer?                        [NDA]
  A)
  Half of its range of temperature between the upper and the lower fixed points done clear
  B)
  Approximately \[41{}^\circ C\] done clear
  C)
  Approximately \[59{}^\circ C\] done clear
  D)
  \[18{}^\circ C\] done clear
  View Solution play_arrow

• question_answer51)
          When water is heated from \[0{}^\circ C\] to \[20{}^\circ C\], how does its volume change?
  A)
  It shall increase done clear
  B)
  It shall decrease done clear
  C)
  It shall first increase and then decrease done clear
  D)
  It shall first decrease and then increase done clear
  View Solution play_arrow

• question_answer52)
        Thermal conductivity of aluminium, copper and stainless steel increases in the order
  A)
  Copper < Aluminium < Stainless Steel done clear
  B)
  Stainless Steel < Aluminium < Copper done clear
  C)
  Aluminium < Copper < Stainless Steel done clear
  D)
  Copper < Stainless Steel < Aluminium done clear
  View Solution play_arrow

• question_answer53)
        Which of the following statements is/ are false about mode of heat transfer?

  I. In radiation, heat is transferred from one medium to another without affecting the intervening medium

  II. Radiation and convection are possible in vacuum while conduction requires material medium.

  III. Conduction is possible in solids while convection occurs in liquids and gases.

  A)
  I only                done clear
  B)
       II only done clear
  C)
  II and III             done clear
  D)
       I, II and III done clear
  View Solution play_arrow

• question_answer54)
        When pressure on piece of ice is increases its melting point
  A)
  decreases done clear
  B)
  increases done clear
  C)
  remains unchanged done clear
  D)
  first increases and then decreases done clear
  View Solution play_arrow

• question_answer55)
        Consider the following three statements

  1. Heating 1 kg of water from \[10{}^\circ C\] to \[50{}^\circ C\]

  2. Melting 600 g of ice at \[0{}^\circ C\]

  3. Converting 300 g of ice at \[0{}^\circ C\] to water at \[50{}^\circ C\]

  Which one of the following shows the correct arrangement of the quantity of heat required in the above process in increasing order of magnitude? Choose the correct answer from the codes give below
  A)
  1, 2, 3              done clear
  B)
       2, 1, 3 done clear
  C)
  3, 2, 1              done clear
  D)
       3, 1, 2 done clear
  View Solution play_arrow

• question_answer56)
       

  Assertion [A]: The boiling point of water decreases as the altitude increases.

  Reason [R]: The atmospheric pressure increases with altitude. [IAS Prelim]

  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 a 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_answer57)
       

  Assertion [A]: A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece.

  Reason [R]: The density of copper is more than that of glass. [IAS Prelim]

  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 a 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