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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

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Question 1 of 36

Physics

1. Which surface is best reflector of heat?

1.white surface

2.shining silvered surface

3.dull black surface

4.coloured surface

Question 1 of 36

Question 2 of 36

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

1.920.0

2.903.0

3.387.0

4.470.0

Question 2 of 36

Question 3 of 36

3. In gases, heat is mainly transferred by:

1. radiation

2. molecular collision

3.conduction

4. convection

Question 3 of 36

Question 4 of 36

4. Example of a bad conductor is:

1. wool

2. iron

3. gold

4. graphite

Question 4 of 36

Question 5 of 36

5. Reason of glider to remain in air is:

1.convection

2.power

3.radiation

4.conduction

Question 5 of 36

Question 6 of 36

6. False ceiling is done to:

1. insulate the ceiling

2. keep the roof clean

3. lower the height of ceiling

4.cool the room

Question 6 of 36

Question 7 of 36

7. 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 7 of 36

Question 8 of 36

8. 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 = cm∆T²

3.∆Q = 2c∆T

4.∆Q = m∆T

Question 8 of 36

Question 9 of 36

9. Bimetallic strip works on the principle of:

1.expansion of metals

2. contraction of metals

3. unequal expansion of metals

4. both A and B

Question 9 of 36

Question 10 of 36

10. Which process produces cooling effect?

1. boiling

2.freezing

3. evaporation

4.condensation

Question 10 of 36

Question 11 of 36

11. Temperature of ice in freezer is:

1.– 8°C

2.– 28°C

3.0 °C

4.– 18°C

Question 11 of 36

Question 12 of 36

12. Heat transfers through fluids by the method called:

1. radiation

2.convection

3. absorption

4.conduction

Question 12 of 36

Question 13 of 36

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

1.100°F

2.90°F

3.122°F

4.102°F

Question 13 of 36

Question 14 of 36

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

1.F = 1.8 C – 32

2.F = 1.4 C – 32

3.F = 1.8 C + 32

4.F = 1.4 C + 32

Question 14 of 36

Question 15 of 36

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

1.33.6 x 10⁵Jkg⁻¹

2.336 x 10⁵Jkg⁻¹

3.3.36 x 10⁵Jkg⁻¹

4.3.36 x 10³Jkg⁻¹

Question 15 of 36

Question 16 of 36

16. The specific heat of water is:

1.1760Jkg⁻¹K⁻¹

2.800 Jkg⁻¹ K⁻¹

3.2500 Jkg⁻¹K⁻¹

4.4200 Jkg⁻¹K⁻¹

Question 16 of 36

Question 17 of 36

17. Which of the following effects evaporation?

1.surface area of the liquid

2.temperature

3.all of these

4.air

Question 17 of 36

Question 18 of 36

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

1. 400

2. 430

3.245

4. 105

Question 18 of 36

Question 19 of 36

19. Water freezer at:

1. 0°F

2.0K

3.-273K

4.32°F

Question 19 of 36

Question 20 of 36

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

1.1

2. 4

3. 2

4.3

Question 20 of 36

Question 21 of 36

21. Absolute zero is equal to:

1.0°C

2.100 °C

3.– 273°C

4.100 K

Question 21 of 36

Question 22 of 36

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

1.β= ∆V/V₀∆T

2. β= ∆T/∆V

3.β= ∆V/∆T

4. β= ∆T/V₀∆V

Question 22 of 36

Question 23 of 36

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

1.ice

2.Copper

3.water

4.mercury

Question 23 of 36

Question 24 of 36

24. Rooms are heated using gas heaters by:

1. convection only

2.conduction only both

3. convection and radiation

4. radiation only

Question 24 of 36

Question 25 of 36

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

1.mc

2.c/m

3.mc²

4.m/c

Question 25 of 36

Question 26 of 36

26. In solids, heat is transferred by:

1.absorption

2.convection

3.conduction

4.radiation

Question 26 of 36

Question 27 of 36

27. 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 27 of 36

Question 28 of 36

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

1.273 + C

2.273 – C

3.273 – F

4.273 + F

Question 28 of 36

Question 29 of 36

29. Thermal conductivity of silver is:

1.0.2 Wm⁻¹K⁻¹

2. 0.59 Wm⁻¹K⁻¹

3. 1.7 Wm⁻¹K⁻¹

4. 0.08 Wm⁻¹K⁻¹

Question 29 of 36

Question 30 of 36

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

1.CO₂

2.NH₃

3.N₂

4.H₂

Question 30 of 36

Question 31 of 36

31. Normal human body temperature is:

1.98.6°F

2.15°F

3.37°F

4.38°F

Question 31 of 36

Question 32 of 36

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

1.JkgK

2.Jkg⁻¹ K⁻¹

3.J⁻¹kg⁻¹ K⁻¹

4.JkgK⁻¹

Question 32 of 36

Question 33 of 36

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

1. becomes one fourth

2.becomes half

3.becomes double

4.remains the same

Question 33 of 36

Question 34 of 36

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

1.five times

2.two times

3.three times

4.four times

Question 34 of 36

Question 35 of 36

35. 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 – α∆T)

3.L = L₀(1 + ∆T)

4.L = L₀(1 – ∆T)

Question 35 of 36

Question 36 of 36

36. The specific heat of water is:

1.2100 Jkg⁻¹ K⁻¹

2.2500 Jkg⁻¹ K⁻¹

3.2010 Jkg⁻¹ K⁻¹

4.4200 Jkg⁻¹ K⁻¹

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