# Online Test for Class 11 Physics Thermal Properties of Matter

## Thermal Properties of Matter Class 11 MCQs Questions with Answers

Welcome to this Free Online Mock Test Class 11 Physics Thermal Properties of Matter. This test contains MCQs for Chapter 11 Thermal Properties of Matter with Answers for Class 11 Physics. The MCQ questions were created using the most recent exam format. Practicing these questions would allow students to check their knowledge and have a good grasp of the concepts.

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

General Instructions

1. Your test contains multiple-choice questions with only one answer type questions. There are a total of 20 questions
2. This is a 30 min test. Please make sure you complete it in stipulated time
3. You can finish this test any time using the 'Submit' button.

1. Consider two rods of same length and different specific heats $(S_1 , S_2 )$, conductivities $(K_1 , K_2 )$ and area of cross-sections $(A_1 , A_2 )$ and both having temperature $T_1$ and $T_2$ at their ends. If the rate of loss of heat due to conduction is equal, then
2. Unit of Stefan’s constant is
3. On a cold morning, a metal surface will feel colder to touch than a wooden surface, because
4. The sprinkling of water reduces slightly the temperature of a closed room, because
5. The wavelength of radiation emitted by a body depends upon
6. Which of the following is more close to a black body?
7. If the temperature of the sun is doubled, the rate of energy received on earth will be increased by a factor
8. The ratio of the thermal conductivity of two rods of different material is 5 : 4. The two rods of same area of cross-section and same thermal resistance will have the length in the ratio
9. Three rods of equal length of thermal conductivities k, 2k and 3k are symmetrically joined to a point. If temperature of ends are 0° C, 50 ° C and 100 ° C respectively. What is the temperature of the junction?
10. Three discs, A, B and C having radii 2m, 4m and6m respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are 300nm, 400nm and 500 nm, respectively. The power radiated by them are $Q_A$, $Q_B$ and $Q_C$ respectively
11. In the following question, a statement of assertion is followed by a statement of reason. You are required to choose the correct one out of the given responses.

Assertion: Water kept in an open vessel will quickly evaporate on the surface of the moon.
Reason: The temperature at the surface of the moon is much higher than the boiling point of water.
12. In the following question, a statement of assertion is followed by a statement of reason. You are required to choose the correct one out of the given responses.

Assertion: A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation.
Reason: All metals act as a black body.
13. In the following question, a statement of assertion is followed by a statement of reason. You are required to choose the correct one out of the given responses.

Assertion: Blue star is at high temperature than red star.
Reason: Wein’s displacement law states that $T \alpha (1/ \lambda_m). 14. In the following question, a statement of assertion is followed by a statement of reason. You are required to choose the correct one out of the given responses. Assertion: A brass tumbler feels much colder than a wooden tray on a chilly day. Reason: The thermal conductivity of brass is less than that of wood. 15. An electric heater is used in a room with a total wall area of$137m^2$to maintain a temperature of +20 C inside it when the outside temperature is −10C. The walls have three different layers of materials. The innermost layer is of wood thickness 2.5cm, the middle layer is of cement of thickness 1.0cm and the outermost layer is of brick of thickness 25.0cm. Assume that there is no heat loss through the floor and the ceiling. The internal conductivities of wood, cement and brick are 0.125,1,5 and 1.0 watt/m/ ° C respectively. What is the equivalent thermal conductivity of the wall? 16. Find the power of the electric heater 17. The temperature of the sun is measured with 18. The coefficient of linear expansion of brass and steel are$\alpha _1$and$\alpha _2$. If we take a brass rod of length$l_1$and steel rod of length$l_2$at 0 ° C and their difference in length ($l_2 −l_1\$) will remain the same at all temperatures if
19. Woolen clothes keep the body warm because wool
20. Emissive and absorptive power of material at 2000K is 8 and 10 respectively, calculate the emissivity of IBB (ideal black body

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