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Free download in PDF Class 11 Physics Chapter 11 Thermal Properties of Matter Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(1)
A person with dark skin as compared to a person with white skin will experience
[A]
Less heat and less cold
[B]
More heat and more cold
[C]
More heat and less cold
[D]
Less heat and more cold.
Answer: More heat and more cold
(2)
The best ideal black body is
[A]
Lamp of charcoal heated to high temperature
[B]
Metal coated with a black dye
[C]
Glass surface coated with coalter
[D]
Hollow enclosure blackened inside and having a small hole
Answer: Hollow enclosure blackened inside and having a small hole
(3)
The process of heat transfer in which heat is transferred with actual migration of medium particles is known as (AFMC-94)
[A]
Conduction
[B]
Convection
[C]
Radiation
[D]
Reflection
(4)
The flow of heat from a hot body to a cold body is an example of
[A]
Isothermal process
[B]
Reversible process
[C]
Adiabatic process
[D]
Irreversible process
Answer: Irreversible process
(5)
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
[A]
50 cal/cm²s
[B]
250 cal/cm²s
[C]
80 cal/cm²s
[D]
100 cal/cm²s
(6)
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
[A]
t1 – t2 = t3
[B]
t1 < t2 < t3
[C]
t1 > t2 > t3
[D]
t1 < t2 > t3
(7)
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
[A]
256 : 81
[B]
81 : 256
[C]
3 : 4
[D]
4 : 3
(8)
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.
[A]
50 sec
[B]
90 sec
[C]
60 sec
[D]
30 sec
(9)
Unit of Stefans constant is given by
[A]
W/ m K²
[B]
W/ m² K²
[C]
W²/ m² K4
[D]
W/ mK
(10)
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,
[A]
5801 K
[B]
106 K
[C]
50.1 K
[D]
2801 C
(11)
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
[A]
1.36 times
[B]
2.36 times
[C]
3.36 times
[D]
4.36 times
(12)
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
(13)
Emissivity of perfectly black body is
(14)
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
[A]
30°C
[B]
28°C
[C]
36°C
[D]
32°C
(15)
Absorptive power of perfectly black body is
[A]
Zero
[B]
Infinity
[C]
One
[D]
Constant
(16)
For which of the following process, the thermal conduction is maximum?
[A]
Combustion
[B]
Radiation
[C]
Convection
[D]
Conduction
(17)
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
[A]
(T14 – T24)
[B]
(T1 – T2)4
[C]
(T14 + T24)
[D]
(T13 – T23)
(18)
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
[A]
P
[B]
2p
[C]
4p
[D]
16p
(19)
The good absorber of heat are
[A]
Non-emitter
[B]
Poor-emitter
[C]
Good-emitter
[D]
Highly polished
(20)
Co-efficient of reflection, coefficient of absorption and coefficient transmission are related as
[A]
a + r + 1 = 1
[B]
a + r + t1 1
[C]
a + r = -t
[D]
a1 r + 1
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