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A spherical body of area A and emissivity e 0.6is kept inside a perfectly black body. Total heat radiated by the body at temperature T

0.4 eAT4

0.8eAT4

0.6eAT4

1.0eAT4

Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1oC and it is defined under which of the following conditions?

From 14.5oC to 15.5oC at 760 mm of Hg

From 98.5oC to 99.5oC at 760 mm of Hg

From 13.5oC 14.5oC at 760 mm of Hg

From 3.5oC 4.5oC at 76 mm of Hg

A cylinder of radius R made of a material of thermal conductivity K1 is surroun ded by a cylindrical shell of inner radius R and outer radius 2 R made of a material of thermal conductivity K2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is

K1 + K2

K1K2/(K1+K2)

(K1+3K2)/4

(3K1+3K2)/4

Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K. The piston of A is heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 30 K. Then the rise in temperature of the gas in B is

30 K

18 K

50 K

42 K

A spherical black body with a radius of 12 cm radiates 450 W power at 500 K, if the radius were halved and the temperature doubled, the power radiated in watt would be

225

450

900

1800

In a given process on an ideal gas, dW=0 and dQ<0. Then for the gas

The temperature will decrease

The volume will increase

The pressure will remain constant

The temperature will increase

The intensity to radiation emitted by the sun has its maximum value at a wavelength of 510 nm and that emitted by the North Star has the maximum value at 350 nm. If these stars behave like blackbodies, then the ratio of the surface temperatures of the Sun and the North Star is

1.46

0.69

1.21

0.83

An ideal Black-body at room temperature is thrown into a furnace. It is observed that

Initially it is the darkest body and at later times the brightest

It is the darkest body at all times

It cannot be distinguished at all times

Initially it is the darkest body and at later times it cannot be distinguished

Three discs A, B and C having radii 2,4 and 6 cm respectively are coated with carbon black. Wavelengths for maximum intensity for the three discs are 300, 400 and 500 nm respectively. If QA, QB and QC are power emitted by A, B and D respectively, then

QA will be maximum

QB will be maximum

QC will be maximum

QA=QB=QC

An ideal gas is initially at P1 V1 is expanded to P2 V2 and then compressed adiabatically to the same volume V1 and pressure P3. If W is the net work done by the gas in complete process which of the following is true

W>0: P3> P1

W<0: P3>P1

W>0: P3 W<0:P3

0.4 eAT4

0.8eAT4

0.6eAT4

1.0eAT4

Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1oC and it is defined under which of the following conditions?

From 14.5oC to 15.5oC at 760 mm of Hg

From 98.5oC to 99.5oC at 760 mm of Hg

From 13.5oC 14.5oC at 760 mm of Hg

From 3.5oC 4.5oC at 76 mm of Hg

A cylinder of radius R made of a material of thermal conductivity K1 is surroun ded by a cylindrical shell of inner radius R and outer radius 2 R made of a material of thermal conductivity K2. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is

K1 + K2

K1K2/(K1+K2)

(K1+3K2)/4

(3K1+3K2)/4

Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K. The piston of A is heat is given to the gas in each cylinder. If the rise in temperature of the gas in A is 30 K. Then the rise in temperature of the gas in B is

30 K

18 K

50 K

42 K

A spherical black body with a radius of 12 cm radiates 450 W power at 500 K, if the radius were halved and the temperature doubled, the power radiated in watt would be

225

450

900

1800

In a given process on an ideal gas, dW=0 and dQ<0. Then for the gas

The temperature will decrease

The volume will increase

The pressure will remain constant

The temperature will increase

The intensity to radiation emitted by the sun has its maximum value at a wavelength of 510 nm and that emitted by the North Star has the maximum value at 350 nm. If these stars behave like blackbodies, then the ratio of the surface temperatures of the Sun and the North Star is

1.46

0.69

1.21

0.83

An ideal Black-body at room temperature is thrown into a furnace. It is observed that

Initially it is the darkest body and at later times the brightest

It is the darkest body at all times

It cannot be distinguished at all times

Initially it is the darkest body and at later times it cannot be distinguished

Three discs A, B and C having radii 2,4 and 6 cm respectively are coated with carbon black. Wavelengths for maximum intensity for the three discs are 300, 400 and 500 nm respectively. If QA, QB and QC are power emitted by A, B and D respectively, then

QA will be maximum

QB will be maximum

QC will be maximum

QA=QB=QC

An ideal gas is initially at P1 V1 is expanded to P2 V2 and then compressed adiabatically to the same volume V1 and pressure P3. If W is the net work done by the gas in complete process which of the following is true

W>0: P3> P1

W<0: P3>P1

W>0: P3

Students who are preparing for entrance examinations should find these revision tests useful TOPICS : HEAT AND THERMODYNAMICS Subtopics: work done in adiabatic process, black body radiation, sp.heat of gas,conductivity

AIEEE Physics: Heat and thermodynamics IIT JEE Physics AIPMT Physics: Heat and Thermodynamics Heat and Thermodynamics

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