Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 69

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Weekly Quiz Competition

Question 1
4 / -1

The temperature of sun is 5500 K and it emits maximum intensity radiation in the yellow region (5.5 × 10^–7 m). The maximum radiation from a furnace occurs at wavelength 11 × 10^–7 m. The temperature of furnace is

A
1125 K

B
2750 K

C
5500 K

D
11000 K

Solution
Question 2
4 / -1

The surface temperature of the sun is

A
2900 K

B
4000 K

C
5800 K

D
9000 K
Question 3
4 / -1

A metal ball of surface area 200 cm² and temperature 527^oC is surrounded by a vessel at 27^oC. If the emissivity of the metal is 0.4, then the rate of loss of heat from the ball is (σ = 5.67 × 10^–8 J/m²–s–K⁴)

A
108 J approx

B
168 J approx

C
182 J aprox

D
192 J approx

Solution
Question 4
4 / -1

The temperature of a piece of iron is 27^oC and it is radiating energy at the rate of Q kWm^–2. If its temperature is raised to 151^oC, the rate of radiation of energy will become approximately

A
2 Q kWm^–2

B
4 Q kWm^–2

C
6 Q kWm^–2

D
8 Q kWm^–2

Solution
Question 5
4 / -1

The temperature of two bodies A and B are 727^oC and 127^oC. The ratio of rate of emission of radiations will be

A
727/127

B
625/16

C
1000/400

D
100/16

Solution
Question 6
4 / -1

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

A
–65^oC

B
65^oC

C
65 K

D
None of these

Solution
Question 7
4 / -1

The tungsten filament of an electric lamp has a surface area A and a power rating P. If the emissivity of the filament is ϵ and σ is Stefan\'s constant, the steady temperature of the filament will be

A

B

C

D

Solution
Question 8
4 / -1

A thin square steel plate with each side equal to 10 cm is heated by a blacksmith. The rate of radiates energy by the heated plate is 1134 W. The temperature of the hot steel plate is (Stefan\'s constant σ = 5.67 × 10^–8 watt m^–2K^–4, emissivity of the plate = 1)

A
1000 k

B
1189 K

C
2000 K

D
2378 K

Solution
Question 9
4 / -1

The energy emitted per second by a black body at 27^oC is 10 J. If the temperature of the black is increased to 327^oC, the energy emitted per second will be

A
20 J

B
40 J

C
80 J

D
160 J

Solution
Question 10
4 / -1

A spherical black body with a radius of 12 cm radiates 440 W power at 500 K. If the radius were halved and the temperatures doubled, the power radiated in watt would be

A
225

B
450

C
900

D
1800

Solution