Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 11

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

Two spherical black bodies of radii r₁ and r₂ and with surface temperatures T₁ and T₂ respectively radiate the same power. Then, the ratio of r₁ and r₂ will be

A

B

C

D
Question 2
4 / -1

The temperatures of two bodies A and B are respectively 727°C and 327°C. The ratio H_A : H_B of the rates of heat radiated by them is

A
727 : 327

B
5 : 3

C
25 : 9

D
625 : 81
Question 3
4 / -1

Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. The first and third plates are maintained at temperatures 2T and 3T respectively. The temperature of the middle (i.e. second ) plate under steady state condition, is

A

B

C

D
Question 4
4 / -1

Two spheres of radii 8 cm and 2 cm are cooling. Their temperatures are 127°C and 527°C respectively. Find the ratio of energy radiated by them in the same time

A
0.06

B
0.5

C
1

D
2
Question 5
4 / -1

'Good emitters are good absorbers' is a statement concluded from

A
Newton's law of cooling

B
Stefan's law of radiation

C
Provost's theory

D
Kirchoff's law
Question 6
4 / -1

A black body at a temperature of 227°C radiates heat at the rate of 5 cal cm^-2s ^-1. At a temperature of 727°C, the rate of heat radiated per unit area in cal cm ²s^-1 is

A
400

B
80

C
40

D
15
Question 7
4 / -1

The wavelength X. = 5.5 × 10^-7m when temperature of the sun is 5500 K. If the furnace has wavelength λ_m equal to 1 is 10^-7m, then temperature of furnace is

A
5000 K

B
1750 K

C
3750 K

D
2750 K

Solution
Question 8
4 / -1

We consider the radiation emitted by the human body. Which of the following statement is true?

A
The radiation is emitted during the summers and absorbed during the winters

B
The radiation emitted lies in the ultraviolet region and hence is not visible

C
The radiation emitted is in the infrared region

D
The radiation is emitted only during the day
Question 9
4 / -1

The temperature at which a black body ceases to radiate energy, is

A
zero

B
273 K

C
30 K

D
100 K
Question 10
4 / -1

In which mode of transmission, the heat waves travel along straight line with the speed of light?

A
Thermal radiation

B
Forced convection

C
Natural convection

D
Thermal conduction