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CBSE

Subject

Physics

NEET Physics : Thermal Properties of Matter

Multiple Choice Questions

61.

Two conductors having same width and length, thickness d₁ and d₂ thermal conductivity K₁ and K₂ are placed one above the another. Find the equivalent thermal conductivity.

$\frac{(d_{1} + d_{2}) (K_{1} d_{2} + K_{2} d_{1})}{2 (K_{1} + K_{2})}$
$\frac{(d_{1} - d_{2}) (K_{1} d_{2} + K_{2} d_{1})}{2 (K_{1} + K_{2})}$
$\frac{K_{1} d_{1} + K_{2} d_{2}}{d_{1} + d_{2}}$
$\frac{K_{1} + K_{2}}{d_{1_{}} + d_{2}}$

62.

Assertion: Maximum air flow due to convection does not occur at the north pole but it occurs at 30°N.

Reason: There is maximum temperature difference between equator and 30° N.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

63.

Dimensional formula of ΔQ, heat supplied to the system is given by

[ M¹ L² T^-2 ]
[ M¹ L¹ T^-2 ]
[ M¹ L² T^-1 ]
[M¹ L¹ T^-1 ]

64.

When a current is passed in a conductor, 3^o C rise in temperature is observed. If the strength of current is made thrice, then rise in temperature will approximately be

36^oC
27^o C
18^o C
9^o C

65.

Assertion: C_P is always greater than C_V in gases.

Reason: Work done at constant pressure is more than at constant volume

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

66.

Assertion: When hot water is poured in a beaker of thick glass, the beaker cracks.

Reason: Outer surface of the beaker expands suddenly.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false

67.

1 g of steam is sent into 1 g of ice. At thermal equilibrium, the resultant temperature of mixture is

270^oC
230^oC
100^oC
120^oC

68.

In a metal with positive Thomson coefficient, current is passed from the lower temperature to higher temperature to higher temperature side. The heat will be

absorbed
constant
evolved
either 'b' or 'c'

69.

Assertion: Water kept in an open vessel will quickly evaporate on the surface of the moon.

Reason: The temperature at the surface of the moon is much higher than the boiling point of water.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.

70.

Emissive and absorptive power of a material at 2000 K is 8 and 10 respectively, calculate the emissivity of IBB (Ideal black body)

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