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# Physics Topic-wise Test - 10

## 45 Questions MCQ Test NEET Mock Test Series & Past Year Papers | Physics Topic-wise Test - 10

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This mock test of Physics Topic-wise Test - 10 for NEET helps you for every NEET entrance exam. This contains 45 Multiple Choice Questions for NEET Physics Topic-wise Test - 10 (mcq) to study with solutions a complete question bank. The solved questions answers in this Physics Topic-wise Test - 10 quiz give you a good mix of easy questions and tough questions. NEET students definitely take this Physics Topic-wise Test - 10 exercise for a better result in the exam. You can find other Physics Topic-wise Test - 10 extra questions, long questions & short questions for NEET on EduRev as well by searching above.
QUESTION: 1

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QUESTION: 2

Solution:
QUESTION: 3

### An ideal gas is heated from 270  to 6270C  at constant pressure. If initial volume was 4m3then the final volume of gas will be

Solution:
QUESTION: 4

When we heat a gas sample from to 3270C then the initial average kinetic energy of the molecules was E. What will be the average kinetic energy after heating?

Solution:
QUESTION: 5
If at the same temperature and pressure,the densities of two diatomic gases are and respectively,then the ratio of velocities of sound in these gases is
Solution:
QUESTION: 6

A molecule of mass m of an ideal gas collides with the wall of the vessel with the same velocity. The change in the linear momentum of the molecule will be

Solution:
QUESTION: 7
Rate of diffusion is
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QUESTION: 8
The instrument used to measure the temperature of the source from its thermal radiation is
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QUESTION: 9

A Centigrade and Fahrenheit thermometers are dipped in boling water. The Fehrenheit thermometer registers a temperature of 1400.The temperature as registered by the centigrade thermometer is

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QUESTION: 10
Which one of the following is not a thermodynamical co-ordinate ?
Solution:
QUESTION: 11

The mean kinetic energy of a molecule of a gas at 300 K is 6.21 x 10-21J  The root mean square velocity of a molecule of Hgas at this temperature will be (R = 8.3 J/mole K, N = 6.02 x 1023 / mole mass of the hydrogen moleucle = 2 x 1.67 x 10-27 kg

Solution:
QUESTION: 12

At what temperautre will the rms velocity of oxygen moleucle be sufficient, so as to escape from the earth? Escape velocity from the earth is 11.0 km/s and the mass of 1 moleucle of oxygen 5.34 x 10-26 (Boltzman constant k = 1.38 x 10-23 J/K)

Solution:
QUESTION: 13

A steel rod 25 cm lo (Y = 20 x 1011 dyne/cm2)ng has a cross-sectional area of 0.8 cm2. What would be the force required to strech this rod by the same amount as the expansion produced by heating it through 100C ? (α = 10-5/0C

Solution:
QUESTION: 14

A steel scale measures the lenght of a copper wire as 80.0 cm, when both are at 200C the calibration temperature for the scale. What would the scale read for the lenght of the rod when both are at 400  (Given: α for steel = 11 x 10-6/0C and α for Cu = 17 x 10-6/0C)

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QUESTION: 15

A sample of gas expands from volume V1 to V2. The amount of work done by the gas is greatest, when the expansion is

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QUESTION: 16
During the adiabatic expansion of 2 moles of a gas the internal energy of a gas is found to decrease by 2J. The work done during the process on gas will be equal to
Solution:
QUESTION: 17

In an adiabatic change, the pressure and temperature of a monoatomic gas are related with relation as P α TC where C is equal to

Solution:
QUESTION: 18

Two samples of air X and Y having same composition and initially at the same temperature and pressure are compressed from volume V to V/2. X is compressed isothermally and Y adiabatically. Then, the final pressure will be

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QUESTION: 19
Magnitude of slope of an adiabatic curve is always
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QUESTION: 20

Air is filled in a bottle at atmoshperic pressure and it is cordked at 350C . If the cork can come out at 3 atmospheric pressure then up to what temperature should the bottle be heated in order to remove the cork?

Solution:

Solution :- P1 V1 / T1 = P2 V2 / T2

Volume is constant (bottle volume). So,

P1 / T1 = P2 / T2

1 / (273+35) = 3 / T2

So temperature to be heated is, 651 deg C.

QUESTION: 21

A perfect gas goes from state A to another state B by absorbing 8 x 105J of heat and doing 6.5 x 105J external work. It is now transferred between the same two states in another process in which it absorbs 105J of heat. Then, in the second process

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QUESTION: 22
If a system undergoes contraction of volume, then the work done by the system will be
Solution:
QUESTION: 23

First law of thermodynamics is a special case of

Solution:
QUESTION: 24

An ideal refrigerator has a freezer at a temperature of -130CThe coefficient of performance of the engine is 5. The temperature of the air (to which heat is rejected) will be

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QUESTION: 25
A Carnot reversible engine converts 1/6 of heat input work. When the temperature of the sink is reduced by 62 K, the efficiency of Carnot’s cycle becomes1/3. The temperature of the source and sink will be
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QUESTION: 26

Compressional wave pules are sent to the bottom of sea from a ship and echo is heard after 2s. If bulk modulus of elasticity of water is 2 x 109N/m2 and density of water at 40C is 1 x 103kg/m3 The depth of the sea will be

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QUESTION: 27

A quantity of heat required to change the unit mass of a solid substance to its liquid state, while the temperature remains constant, is known as

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QUESTION: 28
When a solid is converted into a gas,directly by heating then this process is known as
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QUESTION: 29
The latent heat of vapourization of water is 2240 J.If the work done in the process of vapourization of 1 g is 168 J, then increase in internal energy will be
Solution:
QUESTION: 30

If the temperature of a black body increases from 70C to 2870C then, the rate of energy of radiation is

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QUESTION: 31
When the thermal conductivity of a rod is 2. What is its thermal resistivity ?
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QUESTION: 32

On a cold morning, a metal surface on touching is felt colder than a wooden surface, because the metal has

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QUESTION: 33
Heat travels through vaccum by
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QUESTION: 34
The sum emits a light with maximum wavelength 510 nm while another star emits a light with maximum wavelength of 350 nm. The ratio of surface temperature of sun and the star will be
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QUESTION: 35

A black body radiates heat energy at the rate of 2 x 105J/s-m2  at 400 K. The temperature of the black body at which rate of heat radiation is 32 x 105 J/s-m2 will be

Solution:
QUESTION: 36

A star will appear blue, if the wavelength of maximum emission is in the range 450 to 490 nm. The range of temperature corresponding to which a star will appear blue, will be (Wien’s constant b = 2.897 x 10-3mK)

Solution:
QUESTION: 37

Direction : Read the following question and choose
A. If both Assetion and Reason are correct and reason is the correct exaplanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : A body that is a good ratiator is also a good absorber of radiation at a given wavelength
Reason : According to Kirchhoff ’s law the absorptivity of a body is equal to its emissivity at a given wavelength

Solution:
QUESTION: 38
Direction : Read the following question and choose
A. If both Assetion and Reason are correct and reason is the correct exaplanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : Temperatures near the sea coast are moderate.
Reason : Water has a high thermal conductivity
Solution:
QUESTION: 39
Direction : Read the following question and choose
A. If both Assetion and Reason are correct and reason is the correct exaplanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : It is hotter over the top of a fire than at the same distance on the sides
Reason : Air surrounding the fire conducts more heat upward
Solution:
QUESTION: 40
Direction : Read the following question and choose
A. If both Assetion and Reason are correct and reason is the correct exaplanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : Air quickly leaking out of a balloon becomes coolers
Reason : The leaking air undergoes adiabatic expansion
Solution:
QUESTION: 41
Direction : Read the following question and choose
A. If both Assetion and Reason are correct and reason is the correct exaplanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : Work and heat are two equivalent form of energy
Reason : Work is the transfer of mechanical energy irrespective of temperature difference, whereas heat is the transfer of thermal energy beacuse of temperature difference only
Solution:
QUESTION: 42
Direction : Read the following question and choose
A. If both Assetion and Reason are correct and reason is the correct exaplanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : Specific heat of a body is always greater than its thermal capacity
Reason : Thermal capacity is the heat required for raising temperature of unit mass of the body through unit degree
Solution:
QUESTION: 43
Direction : Read the following question and choose
A. If both Assetion and Reason are correct and reason is the correct explanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : The molecules at 0oC ice and water will have same potential energy
Reason : Potential energy depends only on temperature of the system
Solution:
QUESTION: 44
Direction : Read the following question and choose
A. If both Assertion and Reason are correct and reason is the correct explanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : In the upper part of the atmosphere, the temperature of air is of the order of 1000 K, even than it is quite cold there
Reason : Molecule density at high altitudes is low
Solution:
QUESTION: 45

Direction : Read the following question and choose
A. If both Assertion and Reason are correct and reason is the correct explanation of assertion
B. If both Assertion and Reason are true, but Reason is not correct explanation of the Assertion
C. If Assertion is true, but the Reason is false
D. If Assertion is false, but the Reason is true
E. If both assertion and reason are false
Assertion : The ratio of specific heat of gas at constant pressure and specific heat at constant volume is more for helium gas, than for hydrogen gas
Reason : Atomic mass of helium is more than that of hydrogen

Solution: