UPSC Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank

done Force of Gravity, Solids and Fluids Total Questions - 50

• question_answer1)
  The value of acceleration due to gravity
  A)
  is same on equator and poles done clear
  B)
  is least on poles done clear
  C)
  is least on equator done clear
  D)
  increases from pole to equator done clear
  View Solution play_arrow

• question_answer2)
        Two objects of different masses falling freely near the surface of moon would
  A)
  have same velocities at any instant done clear
  B)
  have different accelerations done clear
  C)
  experience forces of same magnitude done clear
  D)
  undergo a change in their inertia done clear
  View Solution play_arrow

• question_answer3)
        Which one among the following is the correct value of the gravitational force of the Earth acting on a body of mass 1 kg?
  A)
  8.9 N                done clear
  B)
       9.8 N done clear
  C)
  89 N                 done clear
  D)
       98 N done clear
  View Solution play_arrow

• question_answer4)
        A geostationary satellite
  A)
  can move about any axis done clear
  B)
  must move about the polar axis done clear
  C)
  must move on an axis in the equatorial plane done clear
  D)
  Both [b] and [c] done clear
  View Solution play_arrow

• question_answer5)
        An astronaut in the orbit in a spacecraft feels weightlessness
  A)
  due to the absence of gravity inside done clear
  B)
  due to the face that space craft has no energy done clear
  C)
  because acceleration in the orbit is equal to acceleration of gravity outside done clear
  D)
  their is no gravity outside done clear
  View Solution play_arrow

• question_answer6)
  The weight of a body is 9.8 N at the place where g = 9.8 \[m{{s}^{-2}}\]. Its mass is [NDA]
  A)
  zero                               done clear
  B)
  9.8 kg done clear
  C)
  10 kg                 done clear
  D)
  1kg done clear
  View Solution play_arrow

• question_answer7)
        If the moon is to escape from the gravitational field of the earth forever, it will require a velocity                                    [SSC CGL]
  A)
  11.2 km/s         done clear
  B)
       less than done clear
  C)
  slightly more than 111.2 km/s done clear
  D)
  22.4 km/s done clear
  View Solution play_arrow

• question_answer8)
        In respect of the difference of the gravitational force from electric and magnetic forces, which one of the following statements is true?
  A)
  Gravitational force is stronger than the other two. done clear
  B)
  Gravitational force is attractive only, whereas the electric and the magnetic forces are attractive as well as repulsive. done clear
  C)
  Gravitational force has a very short range. done clear
  D)
  Gravitational force is a long range force, while the other two are short range forces. done clear
  View Solution play_arrow

• question_answer9)
       

  Directions (Q.9) : Each of these questions contain two statements, Assertion and Reason. Each of these  questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes [a], [b], [c] and [d] given below.

  Assertion: The tidal waves in sea are primarily due to the gravitational effect of earth.

  Reason: The intensity of gravitational field of earth is maximum at the surface of earth.

  A)
  Assertion is correct, reason is correct; reason is a correct explanation for assertion. done clear
  B)
  Assertion is correct, reason is correct; reason is not a correct explanation for assertion done clear
  C)
  Assertion is correct, reason is incorrect done clear
  D)
  Assertion is incorrect, reason is correct. done clear
  View Solution play_arrow

• question_answer10)
        Consider the following statements:                         [NDA]

  1. The gravitational force exerted by the sun on the moon is greater than the gravitational force exerted by the earth on the moon.

  2. A heavy body falls at a faster rate than a light body in vacuum.

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

• question_answer11)
        A body weighs 5 kg on equator. At the poles it is likely to weight                               [NDA]
  A)
  5kg done clear
  B)
  less than 5 kg but not zero done clear
  C)
  0 kg done clear
  D)
  more than 5 kg done clear
  View Solution play_arrow

• question_answer12)
  A spring balance is graduated on sea level. A body of mass 1 kg is weighed at consecutively increasing heights from the earth's surface, then what would be the weight indicated by the balance?
  A)
  Weight will go on increasing continuously done clear
  B)
  Weight will go on decreasing continuously done clear
  C)
  Weight will remain same done clear
  D)
  Weight will first increase and then decreases done clear
  View Solution play_arrow

• question_answer13)
        The mass of a body on earth is 100 kg (acceleration due to gravity, \[{{g}_{e}}=10\,\,m/{{s}^{2}}\] .If acceleration due to gravity on the moon is \[{{g}_{e}}/6\], then the mass of the body on the moon is :                            [IAS Prelim]
  A)
  100/6 kg        done clear
  B)
       60 kg done clear
  C)
  100 kg               done clear
  D)
       600kg done clear
  View Solution play_arrow

• question_answer14)
  Match the columns I and II.

  	Column I		Column II
  A.	Weight	1.	Minimum
  B.	\[{{g}_{equator}}\]	2.	Zero
  C.	\[{{g}_{poles}}\]	3.	Vector
  D.	\[{{g}_{centre}}\]	4.	Maximum

   
  A)
  [A] \[\to \] (2);   [B] \[\to \] [1];   [C] \[\to \] (3);   [D] \[\to \] (4) done clear
  B)
  [A] \[\to \] (2);   [B] \[\to \] (2);   [C] \[\to \] (4);   [D] \[\to \] (3) done clear
  C)
  [A] \[\to \] (3);   [B] \[\to \] (1);   [C] \[\to \] (4);   [D] \[\to \] (2) done clear
  D)
  [A] \[\to \] (4);   [B] \[\to \] (3);   [C] \[\to \] (1);   [D] \[\to \] (2) done clear
  View Solution play_arrow

• question_answer15)
       

  Assertion [A]: The weight of a body decreases with the increase of altitude on earth.

  Reason [R]: The earth is not a perfect sphere. [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 hut R is false done clear
  D)
  A is false but R is true done clear
  View Solution play_arrow

• question_answer16)
  If the radius of the earth were to shrink by one percent, its mass remaining the same, the value of g on the earth's surface would: [IAS Prelim]
  A)
  increase by 0.5%            done clear
  B)
  increase by 2% done clear
  C)
  decrease by 0.5% done clear
  D)
  decrease by 2% done clear
  View Solution play_arrow

• question_answer17)
  An artificial satellite orbiting the earth does not fall down because the earth's attraction
  A)
  is balanced by the attraction of the moon done clear
  B)
  vanishes at such distances done clear
  C)
  is balanced by the viscous drag produced by the atmosphere done clear
  D)
  produces the necessary acceleration of its motion in a curved path done clear
  View Solution play_arrow

• question_answer18)
       

  Consider the following statements:

  A body weighs less at the equator than at the poles because:                        [NDA]

  1. earth rotates about its axis.

  2. the ice cap at the poles increases gravitational pull.

  3. equatorial diameter is greater than the polar diameter.

  4. of some unknown facts.

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

• question_answer19)
       

  Assertion [A]: Gravitational attraction is a central force and therefore in motion of planets in the solar system, the angular momentum is conserved.

  Reason [R]: In the motion of planets of the solar system, equal areas are swept in equal 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_answer20)
        Which one of the following statements regarding artificial satellite of the earth is incorrect?
  A)
  The orbital velocity depends on the mass of the satellite done clear
  B)
  A minimum velocity of 8 km/s is required by a satellite to orbit quite close to the earth done clear
  C)
  The period of revolution is large if the radius of its orbit is large done clear
  D)
  The height of a geostationary satellite is about 36000 km from the earth. done clear
  View Solution play_arrow

• question_answer21)
                                                                                                                                                                                           

  Assertion [A]: Space rocket are usually launched in the equatorial line from west to east

  Reason [R]: The acceleration due to gravity is minimum at the equator.

   
  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_answer22)
        A body is at rest on the surface of earth. Which of the following statements is correct?                          [SSC CGL]
  A)
  Only weight of the body acts on it. done clear
  B)
  Only upward force acts on the body. done clear
  C)
  Frictional force acts on the body. done clear
  D)
  Net upward force is equal to the net downward force. done clear
  View Solution play_arrow

• question_answer23)
        Consider a satellite going round the earth in a circular orbit. Which of the following statements is wrong?
  A)
  It is a freely falling body. done clear
  B)
  It is moving with constant speed done clear
  C)
  It is acted upon by a force directed away from the centre of the earth which counter-balances the gravitational pull. done clear
  D)
  It is an accelerated motion done clear
  View Solution play_arrow

• question_answer24)
       

  Assertion: The value of 'g' is greater at the equator than at the poles.

  Reason: Radius is more at the equator than at the poles.

  A)
  If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. done clear
  B)
  If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion. done clear
  C)
  If Assertion is correct but Reason is incorrect. done clear
  D)
  If Assertion is incorrect but Reason is correct. done clear
  View Solution play_arrow

• question_answer25)
        The substance which exhibits practically no elastic effect is
  A)
  rubber            done clear
  B)
       quartz done clear
  C)
  Fe                     done clear
  D)
       Cu done clear
  View Solution play_arrow

• question_answer26)
        Kerosene oil rises up in a wick of lantern because of
  A)
  capillarity done clear
  B)
  buoyant force done clear
  C)
  diffusion of oil through the wick done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer27)
        The tendency of a liquid drop to contract and occupy minimum area is due to:                                   [IAS Prelim]
  A)
  surface tension    done clear
  B)
      viscosity done clear
  C)
  density            done clear
  D)
       vapour pressure done clear
  View Solution play_arrow

• question_answer28)
        Which type/types of pen uses/use capillary action in addition to gravity for flow of ink?                                    [CDS]
  A)
  Fountain pen done clear
  B)
  Ballpoint pen done clear
  C)
  Gel pen done clear
  D)
  Both ballpoint and gel pens done clear
  View Solution play_arrow

• question_answer29)
  When pressure exerted on an enclosed liquid or gas at rest, is transmitted equally in all the directions, is in accordance with:
  A)
  Pascal's law done clear
  B)
  Boyle's law done clear
  C)
  Archimedes' principle done clear
  D)
  Principle of floatation done clear
  View Solution play_arrow

• question_answer30)
  Purity of a metal can be determined with the help of
  A)
  Pascal's law done clear
  B)
  Boyle's law done clear
  C)
  Archimedes principle done clear
  D)
  Conservation of mass principle done clear
  View Solution play_arrow

• question_answer31)
        Flow velocities in an incompressible fluid can be measured with which one of the following?                              [NDA]
  A)
  Barometer         done clear
  B)
       Venturi tube done clear
  C)
  Strain gauge       done clear
  D)
       Manometer done clear
  View Solution play_arrow

• question_answer32)
        If a gas is heated at constant pressure its isothermal compressibility
  A)
  increases with temperature done clear
  B)
  remains constant done clear
  C)
  decreases with temperature done clear
  D)
  decreases inversely with temperature. done clear
  View Solution play_arrow

• question_answer33)
        A liquid is flowing in a streamlined manner through a cylindrical pipe. Along a section containing the axis of the pipe, the flow profile will be :                            [IAS Prelim]
  A)
    done clear
  B)
       done clear
  C)
  done clear
  D)
       done clear
  View Solution play_arrow

• question_answer34)
        For which one of the following is capillarity not the reason?                           [IAS Prelim]
  A)
  Blotting of ink done clear
  B)
  Rising of underground water done clear
  C)
  Spread a water drop on a cotton cloth done clear
  D)
  Rising of water from the roots of a plant to its foliage done clear
  View Solution play_arrow

• question_answer35)
  In scuba-diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because of [CDS]
  A)
  Archimedes' principle done clear
  B)
  Boyle's law done clear
  C)
  Gay-Lussac's law of combining volumes done clear
  D)
  Graham's law of diffusion done clear
  View Solution play_arrow

• question_answer36)
        The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity?                                [NDA]
  A)
  Zero done clear
  B)
  More than that measured at the sea level done clear
  C)
  Less than that measured at the sea level done clear
  D)
  Same as that measured at the sea level done clear
  View Solution play_arrow

• question_answer37)
        A block of ice is floating in a beaker containing liquid of specific gravity greater than one. When ice melts completely what happens to the level of liquid in the beaker?                                    [NDA]
  A)
  It will remain the same as before done clear
  B)
  It will go down done clear
  C)
  It will rise up done clear
  D)
  It may or may not change depending upon size of beaker done clear
  View Solution play_arrow

• question_answer38)
       

  Assertion [A]: With the increase of temperature, the viscosity of glycerine increases. [NDA]

  Reason [R]: Rise of temperature increases kinetic energy of molecules.

  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_answer39)
        Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to an equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first?                              [IAS Prelim]
  A)
  Vessel B done clear
  B)
  All the vessels A, B and C will be emptied simultaneously done clear
  C)
  Vessel A done clear
  D)
  Vessel C done clear
  View Solution play_arrow

• question_answer40)
        Consider the following statements:                         [IAS Prelim]

  1. If there were no phenomenon of capillarity it would be difficult to use a kerosene lamp

  2. one would not be able to use a straw to consume a soft drink

  3. the blotting paper would fail to function

  4. the big trees that we see around would not have grown on the Earth

  Which of the statements given above are correct?
  A)
  1, 2 and 3 only               done clear
  B)
  1, 3 and 4 only done clear
  C)
  2 and 4 only      done clear
  D)
       1, 2, 3 and 4 done clear
  View Solution play_arrow

• question_answer41)
        Raw mangoes shrivel when pickled in brine. The phenomenon is associated with                                  [CDS]
  A)
  osmosis done clear
  B)
  reverse osmosis done clear
  C)
  increase of surface tension of fluid done clear
  D)
  decrease of surface tension of fluid done clear
  View Solution play_arrow

• question_answer42)
       

  Assertion [A]: An iron ball floats on mercury but gets immersed in water.

  Reason [R]: The specific gravity of iron is more than that of mercury. [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_answer43)
        A liquid is kept in a regular cylindrical vessel up to a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will                            [CDS]
  A)
  remain unaffected done clear
  B)
  be reduced to half the earlier pressure done clear
  C)
  be increased to twice the earlier pressure done clear
  D)
  be reduced to one-fourth the earlier pressure done clear
  View Solution play_arrow

• question_answer44)
        Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent                                    [CDS]
  A)
  reduces drastically the surface tension between water and oil done clear
  B)
  increases the surface tension between water and oil done clear
  C)
  increases the viscosity of water and oil done clear
  D)
  decreases the viscosity in detergent mixed water done clear
  View Solution play_arrow

• question_answer45)
        A liquid rises to a certain length in a capillary tube. The tube is inclined to an angle of \[45{}^\circ \]. The length of the liquid column will                                [NDA]
  A)
  increase done clear
  B)
  decrease done clear
  C)
  remain unchanged done clear
  D)
  first decrease and then increase done clear
  View Solution play_arrow

• question_answer46)
        Two identical blocks of ice, A and B, float in water as shown in the figure given below. Which one among the following statements in this regard is correct?                                    [NDA]
  A)
  Block A displaces a greater volume of water since the pressure acts on a smaller bottom area done clear
  B)
  Block A displaces a greater volume of water since its submerged end is lower in the water. done clear
  C)
  Block B displaces a greater volume of water since its submerged end has a greater area in water done clear
  D)
  The two blocks displace equal volumes of water since they have the same specific gravity and same mass done clear
  View Solution play_arrow

• question_answer47)
        When a ship floats on water                                 [NDA]
  A)
  it displaces no water done clear
  B)
  the mass of water displaced is equal to the mass of the ship done clear
  C)
  the mass of water displaced is lesser than the mass of the ship done clear
  D)
  the mass of water displaced is greater than the mass of the ship done clear
  View Solution play_arrow

• question_answer48)
        Why do two ice blocks join to form one block when pressed together?                         [NDA]
  A)
  Melting point of ice is lowered with increase in pressure done clear
  B)
  Melting point of ice increases with increase in pressure done clear
  C)
  Melting point of ice remains unchanged with increase in pressure done clear
  D)
  Melting point of ice is \[0{}^\circ C\] done clear
  View Solution play_arrow

• question_answer49)
        Consider two hollow glass spheres, one containing water and the other containing mercury. Each liquid fills about one-tenth of the volume of the sphere. In zero gravity environment                                  [NDA]
  A)
  water and mercury float freely inside the sphere done clear
  B)
  water forms a layer on the glass, while mercury floats done clear
  C)
  mercury forms a layer on the glass, while water floats done clear
  D)
  water and mercury both form a layer on the glass done clear
  View Solution play_arrow

• question_answer50)
       

  Assertion [A]: A beaker filled with water at \[4{}^\circ C\]overflows if the temperature is decreased or increased.

  Reason [R]: Density of water is maximum at \[4{}^\circ C\].

  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 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