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Class 11 Physics
Thermal Properties Of Matter
Quiz 1
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Absorptive power of perfectly black body is
0%
Zero
0%
Infinity
0%
One
0%
Constant
Explanation
One
A black body at hot temperature at 227°C radiates heat at a rate of 5 cal/cm²s. at a temperature of 727°C the rate of heat radiated per unit area will be
0%
50 cal/cm²s
0%
250 cal/cm²s
0%
80 cal/cm²s
0%
100 cal/cm²s
Explanation
80 cal/cm²s
A body cools from 50°C to 46°C in 5 minutes and to 40°C in the next 10 minutes. The surrounding temperature is
0%
30°C
0%
28°C
0%
36°C
0%
32°C
Explanation
30°C
For which of the following process, the thermal conduction is maximum?
0%
Combustion
0%
Radiation
0%
Convection
0%
Conduction
Explanation
Radiation
A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in t1 minutes from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes; then
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t1 - t2 = t3
0%
t1 < t2 < t3
0%
t1 > t2 > t3
0%
t1 < t2 > t3
Explanation
t1 < t2 < t3
The good absorber of heat are
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Non-emitter
0%
Poor-emitter
0%
Good-emitter
0%
Highly polished
Explanation
Good-emitter
Two stars A and B radiate maximum energy at 3600°A and 3600°A respectively. Then the ratio of absolute temperatures of A and B is
0%
256 : 81
0%
81 : 256
0%
3 : 4
0%
4 : 3
Explanation
4 : 3
A person with dark skin as compared to a person with white skin will experience
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Less heat and less cold
0%
More heat and more cold
0%
More heat and less cold
0%
Less heat and more cold.
Explanation
More heat and more cold
A cup of tea cools from 80°C to 60°C in one minute. The ambient temperature is 30°C. in cooling from 60°C to 50°C, it will take.
0%
50 sec
0%
90 sec
0%
60 sec
0%
30 sec
Explanation
50 sec
The best ideal black body is
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Lamp of charcoal heated to high temperature
0%
Metal coated with a black dye
0%
Glass surface coated with coalter
0%
Hollow enclosure blackened inside and having a small hole
Explanation
Hollow enclosure blackened inside and having a small hole
The earth intercepts approximately one billionth of the power radiated by the sun. if the surface temperature of the sun were to drop by a factor of 2, the average radiant energy incident on earth per second would reduce by factor of
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2
0%
4
0%
8
0%
16
Explanation
16
The process of heat transfer in which heat is transferred with actual migration of medium particles is known as (AFMC-94)
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Conduction
0%
Convection
0%
Radiation
0%
Reflection
Explanation
Convection
Unit of Stefans constant is given by
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W/ m K²
0%
W/ m² K²
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W²/ m² K
4
0%
W/ mK
Explanation
W/ m² K²
A metal piece heated to T1°K. The temperature of the surrounding is T2°K. the heat in the surrounding due to radiation is proportional to
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(T14 - T24)
0%
(T1 - T2)4
0%
(T14 + T24)
0%
(T13 - T23)
Explanation
(T14 - T24)
The earth receives at its surface radiation from the sun at the rate of 1400 W/m². the distance of the centre of the sun from the surface of the earth is 1.5 1011 m and the radius of the sun is 7.0 108 m. treating sun as a black body, it follows from the above data that its surface temperature is,
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5801 K
0%
106 K
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50.1 K
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2801 C
Explanation
5801 K
A surface at temperature T0°K receives power P by radiation from a small sphere at temperature T >> T0 and at a distance d. if both T and d are doubled, the power received by surface will becomes approximately
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P
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2p
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4p
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16p
Explanation
4p
The temperature of a piece of metal is raised from 27°C to 51.2°C. the rate at which metal radiates energy increases nearly
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1.36 times
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2.36 times
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3.36 times
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4.36 times
Explanation
1.36 times
Emissivity of perfectly black body is
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1
0%
2
0%
5
0%
0
Explanation
1
Co-efficient of reflection, coefficient of absorption and coefficient transmission are related as
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a + r + 1 = 1
0%
a + r + t
1
1
0%
a + r = -t
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a
1
r + 1
Explanation
a + r + 1 = 1
The wavelength of radiation emitted by a body depends upon
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The nature of the surface
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The area of the surface
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the temperature of the surface
0%
All the above
0 h : 0 m : 1 s
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