Thermal Physics Important Questions

10th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. The value of universal gas constant

(a)

3.81 mol–1 K–1

(b)

8.03 mol–1 K–1

(c)

1.38 mol–1 K–1

(d)

8.31 mol–1 K–1

2. Temperature is the average ______ of the molecules of a substance

(a)

difference in K.E and P.E

(b)

sum of P.E and K.E

(c)

difference in T.E and P.E

(d)

difference in K.E and T.E

3. Linear expansion is the change in _____ when object is heated or cooled.

(a)

length

(b)

area

(c)

volume

(d)

density

4. If the atoms or molecules of a gas do not interact with each other, then the gas is said to be an ____

(a)

Inert gas

(b)

Ideal gas

(c)

Imperfect fas

(d)

Pure gas

5. Thermal conduction in metal is due to

(a)

Free electrons

(b)

bound electrons

(c)

Vibration of molecules

(d)

vibration of atoms

6. 6 x 2 = 12
7. State-the law of volume

8. Distinguish between ideal gas and real gas.

9. What is thermal energy?

10. Define coefficient of linear expansion. Write its equation.

11. What is meant by real expansion?

12. Does a substance that heats up quickly have a high or a low specific heat capacity?

13. 3 x 4 = 12
14. Calculate the coefficient of cubical expansion of a zinc bar. Whose volume is increased 0.25 m3 from 0.3 m3 due to the change in its temperature of 50 K.

15. Define and describe thermal expansion.

16. With an illustration, explain the method of Calculation for arial expansion of an object.

17. 3 x 7 = 21
18. Keeping the temperature as constant, a gas is compressed four times of its initial pressure. The volume of gas in the container changing from 20cc (V1 cc) to V2 cc. Find the final volume V2.

19. An aluminium sheet of length 30 m is made into cone for temperature range ΔT = 300 k. Find the change in length of AI sheet?

20. At 303 k the volume of an aluminium sphere is 0.3 m3. The coefficient linear expansion αL=24 K-1. If the final volume is 0.35 m3. What is the final temperature of aluminium sphere?