#### Thermal Physics Important Questions

10th Standard

Reg.No. :
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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. Change in volume of a solid during heating is

(a)

Linear expansion

(b)

Superficial expansion

(c)

Cubical expansion

(d)

apparent expansion

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

(a)

length

(b)

area

(c)

volume

(d)

density

4. Fundamental laws of gases are

(a)

Boyle's law

(b)

Charles's law

(c)

(d)

all the above

5. At constant temperature volume is inversely proportional to pressure of a gas is known as

(a)

Boyle's law

(b)

Charles

(c)

(d)

None

6. 5 x 1 = 5
7. The SI unit of temperature is ______

()

kelvin

8. Temperature is an indication of the _____ of molecules.

()

average kinetic energy

9. The relation between celsius to kelvin

()

K = C+ 273

10. The amount of heat required to raise 1°c of 1 g of water is _____

()

1 calorie

11. Change in dimension due to raise in temperature is called _____

()

thermal expansion

12. 5 x 1 = 5
13. Heat transformation

14. (1)

Negative

15. Boltzmann constant

16. (2)

hot body to cold body

17. Heat is taken out of the body

18. (3)

Positive

19. Heat is given to a body

20. (4)

joule

21. Heat energy

22. (5)

1.381 x 10-23 JK-l

5 x 2 = 10
23. What is co-efficient of cubical expansion?

24. State Boyle’s law

25. State-the law of volume

26. Define temperature.

27. What is absolute temperature?

28. 5 x 3 = 15
29. Find the final temperature of a copper rod. Whose area of cross section changes from 10 m2 to 11 m2 due to heating. The copper rod is initially kept at 90 K. (Coefficient of superficial expansion is 0.0021 /K)

30. 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.

31. Define and describe thermal expansion.

32. With an illustration, explain the method of Calculation for cubical expansion of an object.

33. State and explain Boyle's law.

34. 2 x 5 = 10
35. Explain the experiment of measuring the real and apparent expansion of a liquid with a neat diagram.

36. If you keep ice at 0°C and water at 0°C in either of your hands, in which hand you will feel more chillness? Why?