# Thermal Properties of Matter MCQ Questions for Class 11 Physics Chapter 11 with Answers

NCERTCOURSE.COM given here the NCERT chapter-wise Multiple Choice Questions from Class 11 Physics book Chapter 11 Thermal Properties of Matter with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Thermal Properties of Matter. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

## Q1. S.I. unit of heat is

(i) Joule
(ii) Calorie
(iii) Kilo calorie
(iv) None of the above

(i) Joule

## Q2. Which of the following will radiate heat to large extent?

(i) Rough surface
(ii) Polished surface
(iii) Black rough surface
(iv) Black polished surface

(iii) Black rough surface

## Q3. Co-efficient of reflection, coefficient of absorption and coefficient transmission are related as

(i) a + r + 1 = 1
(ii) a + r + t1 1
(iii) a + r = -t
(iv) a1 r + 1

(i) a + r + 1 = 1

## Q4. Expansion during heating

(i) generally decreases the density of a material
(ii) None of these
(iii) increases the weight of a material
(iv) occurs only in solids

(i) generally decreases the density of a material

## Q5. A circular disc is heated. Its M.I. about an axis passing through its centre and perpendicular to its plane

(i) increases
(ii) decreases
(iii) remains same
(iv) first increases and then decreases

(i) increases

## Q6. In which process the rate of transfer of heat is maximum?

(i) Conduction
(ii) Convection
(iv) In all these heat is transferred with the same velocity

## Q7. The good absorber of heat are

(i) Non-emitter
(ii) Poor-emitter
(iii) Good-emitter
(iv) Highly polished

(iii) Good-emitter

## Q8. Which of the following will expand the most for same rise in temperature?

(i) Aluminium
(ii) Wood
(iii) Glass
(iv) All will expand same

(i) Aluminium

## Q9. When water is heated from 0°C to 10°C, its volume will:

(i) decrease
(ii) increase
(iii) first decrease then increase
(iv) not change

(iii) first decrease then increase

Q10. A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 3000°K, which of these will cool fastest?

(i) Sphere
(ii) Cube
(iii) Plate
(iv) None

(iii) Plate

(i) 1
(ii) 2
(iii) 5
(iv) 0

(i) 1

## Q12. A metal sheet with a circular hole is heated. The hole

(i) gets larger
(ii) gets deformed
(iii) gets smaller
(iv) None of these

(i) gets larger

## Q13. On which of the following property of the body, the coefficient of thermal expansion depends?

(i) Shape
(ii) Size
(iii) Temperature
(iv) P.E. curve

(iv) P.E. curve

## Q14. Newtons law of cooling is also applicable to

(i) Convection losses
(ii) Natural convection losses
(iii) Forced convection losses
(iv) None of the above

(iii) Forced convection losses

## Q15. 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

(i) (T14 – T24)
(ii) (T1 – T2)4
(iii) (T14 + T24)
(iv) (T13 – T23)

(i) (T14 – T24)

## Q16. Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in

(i) convection
(iii) conduction
(iv) None of these

(i) convection

## Q17. In the pressure cooker, the cooking is faster because the increase of vapour pressure :

(i) increases melting point
(ii) increases boiling point
(iii) decreases boiling point
(iv) decreases melting point

(ii) increases boiling point

(i) Zero
(ii) One
(iii) 0.5
(iv) 0.75

(i) Zero

(i) Conduction
(ii) Convection
(iv) Reflection

(ii) Convection

## Q20. Three bodies A, B and C have equal area which are painted red, yellow and black respectively. If they are at same temperature, then

(i) emissive power of C is maximum
(ii) emissive power of A is maximum
(iii) emissive power of B is maximum
(iv) emissive power of A, B and C are equal.

(i) emissive power of C is maximum

## Q21. An iron ball is heated. The percentage increase will be largest in

(i) density
(ii) surface area
(iii) diameter
(iv) volume

(iv) volume

## Q22. The good absorber of heat are

(i) Non-emitter
(ii) Poor-emitter
(iii) Good-emitter
(iv) Highly polished

(iii) Good-emitter

## Q23. The best ideal black body is

(i) Lamp of charcoal heated to high temperature
(ii) Metal coated with a black dye
(iii) Glass surface coated with coalter
(iv) Hollow enclosure blackened inside and having a small hole

(iv) Hollow enclosure blackened inside and having a small hole

## Q24. The latent heat of vaporization of a substance is always

(i) greater than its latent heat of fusion
(ii) less than its latent heat of fusion
(iii) greater than its latent heat of sublimation
(iv) equal to its latent heat of sublimation

(i) greater than its latent heat of fusion

## Q25. Two bars of copper having same length but an equal diameter are heated to the same temperature. The change in length will be:

(i) more in thicker bar
(ii) more in thinner bar
(iii) same for both
(iv) determined by the ratio of length and diameter of the bars

(iii) same for both

Q26. Two spheres made of same material have radii in the ratio 2 : 1. if both the spheres are at same temperature, then what is the ratio of heat radiation energy emitted per second by them?

(i) 1 : 4
(ii) 4 : 1
(iii) 3 : 4
(iv) 4 : 3

(ii) 4 : 1

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