JavaScript is disabled on your browser. Enable JavaScript to use this site. Learn More

The amount of radiation emitted by a perfectly black body is proportional to ____.

temperature on ideal gas scale

fourth root of temperature on ideal gas scale

fourth power of temperature on ideal gas scale

source of temperature on ideal gas scale

A metal ball of surface area and temperature is surrounded by a vessel at. If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is ____.

108 joules approx

168 joules approx

182 joules approx

192 joules approx.

The rate of radiation of a black body at 0°C is. The rate of radiation of this black body at is ____.

An object is at a temperature of. At what temperature would it radiate energy twice as fast? The temperature of the surroundings may be assumed to be negligible ____.

800 K

A black body at a temperature of radiates heat energy at the rate of . At a temperature of, the rate of heat radiated per unit area in cal / cm2 is ____.

80

160

200

150

Energy is being emitted from the surface of a black body at temperature at the rate of . Temperature of the black body at which the rate of energy emission is is ____.

If temperature of a black body increases from to , then the rate of energy radiation increases by ____.

16

4

2

The temperature of a piece of iron is and it is radiating energy at the rate of . If its temperature is raised to , the rate of radiation of energy is come approximately ____.

The temperatures of two bodies A and B are and. The ratio of rate of emission of radiations is ____.

The temperature at which a black body of unit area loses its energy at the rate of 1 joule/second is ____.

65 K

None of the above

The area of a hole of heat furnace is . It radiates calories of heat per hour. If the emissivity of the furnace is 0.80, then its temperature is ____.

1500 K

2000 K

2500 K

3000 K

Two spheres and, of same colour having radii and are maintained at temperatures and respectively. The ratio of energy radiated by and is ____.

0.054

0.0034

1

2

A body radiates energy at a temperature of . If the temperature is increased to, then it radiates energy at the rate of ____.

A thin square steel plate with each side equal to 10 cm is heated by a blacksmith. The rate of radiated energy by the heated plate is 1134 W. The temperature of the hot steel plate is ____. (Stefan's constant, emissivity of the plate = 1)

The temperatures of two bodies and are respectively and. The ratio of the rates of heat radiated by them is ____.

5 : 3

25 : 9

625 : 81

The energy emitted per second by a black body at is . If the temperature of the black body is increased to , the energy emitted per second is ____.

The radiant energy from the sun incident normally at the surface of earth is. What would have been the radiant energy incident normally on the earth, if the sun had a temperature twice of the present one?

A spherical black body with a radius of radiates power at. If the radius was halved and the temperature doubled, the power radiated in watt would be ____.

225

450

900

1800

If the temperature of the sun (black body) is doubled, the rate of energy received on earth is increased by a factor of ____.

2

4

8

16

The ratio of energy of emitted radiation of a black body at and is ____.

1 : 4

1 : 16

1 : 64

1 : 256

temperature on ideal gas scale

fourth root of temperature on ideal gas scale

fourth power of temperature on ideal gas scale

source of temperature on ideal gas scale

A metal ball of surface area and temperature is surrounded by a vessel at. If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is ____.

108 joules approx

168 joules approx

182 joules approx

192 joules approx.

The rate of radiation of a black body at 0°C is. The rate of radiation of this black body at is ____.

An object is at a temperature of. At what temperature would it radiate energy twice as fast? The temperature of the surroundings may be assumed to be negligible ____.

800 K

A black body at a temperature of radiates heat energy at the rate of . At a temperature of, the rate of heat radiated per unit area in cal / cm2 is ____.

80

160

200

150

Energy is being emitted from the surface of a black body at temperature at the rate of . Temperature of the black body at which the rate of energy emission is is ____.

If temperature of a black body increases from to , then the rate of energy radiation increases by ____.

16

4

2

The temperature of a piece of iron is and it is radiating energy at the rate of . If its temperature is raised to , the rate of radiation of energy is come approximately ____.

The temperatures of two bodies A and B are and. The ratio of rate of emission of radiations is ____.

The temperature at which a black body of unit area loses its energy at the rate of 1 joule/second is ____.

65 K

None of the above

The area of a hole of heat furnace is . It radiates calories of heat per hour. If the emissivity of the furnace is 0.80, then its temperature is ____.

1500 K

2000 K

2500 K

3000 K

Two spheres and, of same colour having radii and are maintained at temperatures and respectively. The ratio of energy radiated by and is ____.

0.054

0.0034

1

2

A body radiates energy at a temperature of . If the temperature is increased to, then it radiates energy at the rate of ____.

A thin square steel plate with each side equal to 10 cm is heated by a blacksmith. The rate of radiated energy by the heated plate is 1134 W. The temperature of the hot steel plate is ____. (Stefan's constant, emissivity of the plate = 1)

The temperatures of two bodies and are respectively and. The ratio of the rates of heat radiated by them is ____.

5 : 3

25 : 9

625 : 81

The energy emitted per second by a black body at is . If the temperature of the black body is increased to , the energy emitted per second is ____.

The radiant energy from the sun incident normally at the surface of earth is. What would have been the radiant energy incident normally on the earth, if the sun had a temperature twice of the present one?

A spherical black body with a radius of radiates power at. If the radius was halved and the temperature doubled, the power radiated in watt would be ____.

225

450

900

1800

If the temperature of the sun (black body) is doubled, the rate of energy received on earth is increased by a factor of ____.

2

4

8

16

The ratio of energy of emitted radiation of a black body at and is ____.

1 : 4

1 : 16

1 : 64

1 : 256

This test is on Heat transmission chapter in Thermodynamics

ALL THE QUESTIONS ARE OF SAME MODEL TRY TO GIVE DIFFERENT MODELS

4423 days 4 hours 5 minutes ago

**
XII_Physics_Electromagnetic Induction_7**

10 Questions
| 408 Attempts

**
XII_Physics_Electromagnetic Induction_6**

10 Questions
| 459 Attempts

**
XII_Physics_Electromagnetic Induction_5**

10 Questions
| 204 Attempts

Price:$175

Price:$100

**
PHYSICAL CHEMISTRY [Chapter 4: Thermodynamics]**

Price:$27.27274

Post Cancel