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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

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Question 1 of 36

Physics

1. Heat transfers through fluids by the method called:

1. radiation

2.conduction

3.convection

4. absorption

Question 1 of 36

Question 2 of 36

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

1.mc

2.m/c

3.c/m

4.mc²

Question 2 of 36

Question 3 of 36

3. Reason of glider to remain in air is:

1.convection

2.conduction

3.radiation

4.power

Question 3 of 36

Question 4 of 36

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

1.four times

2.three times

3.two times

4.five times

Question 4 of 36

Question 5 of 36

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

1.JkgK⁻¹

2.Jkg⁻¹ K⁻¹

3.J⁻¹kg⁻¹ K⁻¹

4.JkgK

Question 5 of 36

Question 6 of 36

6. Thermal conductivity of silver is:

1. 0.59 Wm⁻¹K⁻¹

2. 1.7 Wm⁻¹K⁻¹

3. 0.08 Wm⁻¹K⁻¹

4.0.2 Wm⁻¹K⁻¹

Question 6 of 36

Question 7 of 36

7. In solids, heat is transferred by:

1.conduction

2.absorption

3.convection

4.radiation

Question 7 of 36

Question 8 of 36

8. Which process produces cooling effect?

1. evaporation

2.freezing

3.condensation

4. boiling

Question 8 of 36

Question 9 of 36

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

1.273 – F

2.273 + C

3.273 – C

4.273 + F

Question 9 of 36

Question 10 of 36

10. Which surface is best reflector of heat?

1.shining silvered surface

2.white surface

3.dull black surface

4.coloured surface

Question 10 of 36

Question 11 of 36

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

1.β= ∆V/V₀∆T

2.β= ∆V/∆T

3. β= ∆T/V₀∆V

4. β= ∆T/∆V

Question 11 of 36

Question 12 of 36

12. False ceiling is done to:

1. keep the roof clean

2. insulate the ceiling

3.cool the room

4. lower the height of ceiling

Question 12 of 36

Question 13 of 36

13. Absolute zero is equal to:

1.– 273°C

2.0°C

3.100 °C

4.100 K

Question 13 of 36

Question 14 of 36

14. 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 14 of 36

Question 15 of 36

15. 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∆T²

2.∆Q = m∆T

3.∆Q = 2c∆T

4.∆Q = cm∆T

Question 15 of 36

Question 16 of 36

16. Example of a bad conductor is:

1. iron

2. gold

3. graphite

4. wool

Question 16 of 36

Question 17 of 36

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

1.mercury

2.water

3.ice

4.Copper

Question 17 of 36

Question 18 of 36

18. Temperature of ice in freezer is:

1.– 8°C

2.0 °C

3.– 28°C

4.– 18°C

Question 18 of 36

Question 19 of 36

19. The specific heat of water is:

1.2010 Jkg⁻¹ K⁻¹

2.2500 Jkg⁻¹ K⁻¹

3.2100 Jkg⁻¹ K⁻¹

4.4200 Jkg⁻¹ K⁻¹

Question 19 of 36

Question 20 of 36

20. Rooms are heated using gas heaters by:

1. convection only

2.conduction only both

3. convection and radiation

4. radiation only

Question 20 of 36

Question 21 of 36

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

1.NH₃

2.N₂

3.CO₂

4.H₂

Question 21 of 36

Question 22 of 36

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

1.336 x 10⁵Jkg⁻¹

2.3.36 x 10³Jkg⁻¹

3.3.36 x 10⁵Jkg⁻¹

4.33.6 x 10⁵Jkg⁻¹

Question 22 of 36

Question 23 of 36

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

1. 4

2. 2

3.3

4.1

Question 23 of 36

Question 24 of 36

24. Which of the following effects evaporation?

1.all of these

2.surface area of the liquid

3.air

4.temperature

Question 24 of 36

Question 25 of 36

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

1.470.0

2.903.0

3.920.0

4.387.0

Question 25 of 36

Question 26 of 36

26. The specific heat of water is:

1.4200 Jkg⁻¹K⁻¹

2.2500 Jkg⁻¹K⁻¹

3.1760Jkg⁻¹K⁻¹

4.800 Jkg⁻¹ K⁻¹

Question 26 of 36

Question 27 of 36

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

1.becomes half

2.becomes double

3.remains the same

4. becomes one fourth

Question 27 of 36

Question 28 of 36

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

1.F = 1.4 C – 32

2.F = 1.8 C – 32

3.F = 1.4 C + 32

4.F = 1.8 C + 32

Question 28 of 36

Question 29 of 36

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

1.122°F

2.90°F

3.100°F

4.102°F

Question 29 of 36

Question 30 of 36

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

1.uniform thermal expansion

2.small heat capacity

3.low freezing point

4.all the given properties

Question 30 of 36

Question 31 of 36

31. Normal human body temperature is:

1.98.6°F

2.38°F

3.15°F

4.37°F

Question 31 of 36

Question 32 of 36

32. In gases, heat is mainly transferred by:

1.conduction

2. molecular collision

3. radiation

4. convection

Question 32 of 36

Question 33 of 36

33. Water freezer at:

1.32°F

2. 0°F

3.-273K

4.0K

Question 33 of 36

Question 34 of 36

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

1. 400

2.245

3. 430

4. 105

Question 34 of 36

Question 35 of 36

35. Bimetallic strip works on the principle of:

1.expansion of metals

2. both A and B

3. unequal expansion of metals

4. contraction of metals

Question 35 of 36

Question 36 of 36

36. 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 = ∆Qv/m

2.Hv=cm∆Qv

3.Hv = m∆Qv

4.Hv = m/∆Qv

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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