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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

Question 1 of 36

Physics

1. Thermal conductivity of rubber is _________ Wm⁻¹K⁻¹.

1. 400

2. 105

3.245

4. 430

Question 1 of 36

Question 2 of 36

2. On Celsius scale, 50°C is equal on Fahrenheit scale to:

1.90°F

2.100°F

3.122°F

4.102°F

Question 2 of 36

Question 3 of 36

3. The specific heat of water is:

1.2010 Jkg⁻¹ K⁻¹

2.4200 Jkg⁻¹ K⁻¹

3.2100 Jkg⁻¹ K⁻¹

4.2500 Jkg⁻¹ K⁻¹

Question 3 of 36

Question 4 of 36

4. In symbols, co-efficient of volume expansion is defined as:

1.β= ∆V/V₀∆T

2. β= ∆T/∆V

3. β= ∆T/V₀∆V

4.β= ∆V/∆T

Question 4 of 36

Question 5 of 36

5. In gases, heat is mainly transferred by:

1.conduction

2. convection

3. molecular collision

4. radiation

Question 5 of 36

Question 6 of 36

6. If the mass of a body is ‘m’ and change in its temperature is ∆T, then the heat absorbed or released is given by:

1.∆Q = cm∆T

2.∆Q = m∆T

3.∆Q = cm∆T²

4.∆Q = 2c∆T

Question 6 of 36

Question 7 of 36

7. Latent heat of fusion of 1 kg of ace at 0°C is:

1.3.36 x 10³Jkg⁻¹

2.33.6 x 10⁵Jkg⁻¹

3.3.36 x 10⁵Jkg⁻¹

4.336 x 10⁵Jkg⁻¹

Question 7 of 36

Question 8 of 36

8. Which process produces cooling effect?

1.freezing

2.condensation

3. boiling

4. evaporation

Question 8 of 36

Question 9 of 36

9. Celsius temperature is converted into Fahrenheit temperature using the formula:

1.F = 1.4 C + 32

2.F = 1.4 C – 32

3.F = 1.8 C + 32

4.F = 1.8 C – 32

Question 9 of 36

Question 10 of 36

10. Thermal conductivity of silver is:

1. 0.08 Wm⁻¹K⁻¹

2. 0.59 Wm⁻¹K⁻¹

3. 1.7 Wm⁻¹K⁻¹

4.0.2 Wm⁻¹K⁻¹

Question 10 of 36

Question 11 of 36

11. Which gas is used in spite of Freon gas in refrigerator?

1.N₂

2.NH₃

3.H₂

4.CO₂

Question 11 of 36

Question 12 of 36

12. Heat transfers through fluids by the method called:

1.conduction

2.convection

3. absorption

4. radiation

Question 12 of 36

Question 13 of 36

13. Which of the following material has large specific heat?

1.water

2.mercury

3.ice

4.Copper

Question 13 of 36

Question 14 of 36

14. What happens to the thermal conductivity of a wall if its thickness is doubled?

1.remains the same

2.becomes double

3.becomes half

4. becomes one fourth

Question 14 of 36

Question 15 of 36

15. Example of a bad conductor is:

1. wool

2. gold

3. iron

4. graphite

Question 15 of 36

Question 16 of 36

16. Normal human body temperature is:

1.37°F

2.15°F

3.98.6°F

4.38°F

Question 16 of 36

Question 17 of 36

17. Mercury is used as thermometric material because it has:

1.low freezing point

2.all the given properties

3.uniform thermal expansion

4.small heat capacity

Question 17 of 36

Question 18 of 36

18. Which surface is best reflector of heat?

1.coloured surface

2.dull black surface

3.shining silvered surface

4.white surface

Question 18 of 36

Question 19 of 36

19. In solids, heat is transferred by:

1.absorption

2.conduction

3.radiation

4.convection

Question 19 of 36

Question 20 of 36

20. False ceiling is done to:

1. lower the height of ceiling

2. keep the roof clean

3. insulate the ceiling

4.cool the room

Question 20 of 36

Question 21 of 36

21. The ways by which transfer of heat takes place are:

1.3

2. 4

3.1

4. 2

Question 21 of 36

Question 22 of 36

22. Unit of specific heat capacity in SI system is:

1.JkgK

2.J⁻¹kg⁻¹ K⁻¹

3.Jkg⁻¹ K⁻¹

4.JkgK⁻¹

Question 22 of 36

Question 23 of 36

23. Rooms are heated using gas heaters by:

1. convection only

2.conduction only both

3. radiation only

4. convection and radiation

Question 23 of 36

Question 24 of 36

24. If ‘m’ and change in its specific heat, then its heat capacity is given by:

1.mc

2.c/m

3.m/c

4.mc²

Question 24 of 36

Question 25 of 36

25. Water freezer at:

1. 0°F

2.32°F

3.-273K

4.0K

Question 25 of 36

Question 26 of 36

26. Absolute zero is equal to:

1.100 °C

2.– 273°C

3.100 K

4.0°C

Question 26 of 36

Question 27 of 36

27. Specific heat of iron in joules per kilogram per Kelvin is:

1.903.0

2.387.0

3.920.0

4.470.0

Question 27 of 36

Question 28 of 36

28. Bimetallic strip works on the principle of:

1. unequal expansion of metals

2.expansion of metals

3. contraction of metals

4. both A and B

Question 28 of 36

Question 29 of 36

29. Reason of glider to remain in air is:

1.radiation

2.power

3.conduction

4.convection

Question 29 of 36

Question 30 of 36

30. The specific heat of water is:

1.2500 Jkg⁻¹K⁻¹

2.1760Jkg⁻¹K⁻¹

3.4200 Jkg⁻¹K⁻¹

4.800 Jkg⁻¹ K⁻¹

Question 30 of 36

Question 31 of 36

31. Complete the equation T(K) = ___________.

1.273 + F

2.273 – F

3.273 + C

4.273 – C

Question 31 of 36

Question 32 of 36

32. Length of a rod is L₀ on temperature T₀. After heating up to temperature T, its length L becomes:

1.L = L₀(1 + α∆T)

2.L = L₀(1 – ∆T)

3.L = L₀(1 + ∆T)

4.L = L₀(1 – α∆T)

Question 32 of 36

Question 33 of 36

33. Temperature of ice in freezer is:

1.– 8°C

2.– 28°C

3.– 18°C

4.0 °C

Question 33 of 36

Question 34 of 36

34. Which of the following effects evaporation?

1.all of these

2.temperature

3.air

4.surface area of the liquid

Question 34 of 36

Question 35 of 36

35. If a liquid of mass ‘m’ requires thermal energy ‘∆Qv’ to completely change into gas at its boiling point without any change in its temperature, then its latent heat of vaporization can be calculated as following:

1.Hv = m∆Qv

2.Hv = m/∆Qv

3.Hv=cm∆Qv

4.Hv = ∆Qv/m

Question 35 of 36

Question 36 of 36

36. Specific heat of water is how many times greater than that of dry soil?

1.four times

2.two times

3.five times

4.three times

Question 36 of 36

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Test By Topics	9th Class Physics

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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

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Punjab 9th Class Physics Model Paper 7 MCQs Test Online