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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

Question 1 of 36

Physics

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

1.J⁻¹kg⁻¹ K⁻¹

2.JkgK

3.JkgK⁻¹

4.Jkg⁻¹ K⁻¹

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.mc²

2.c/m

3.m/c

4.mc

Question 2 of 36

Question 3 of 36

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

1.F = 1.8 C + 32

2.F = 1.8 C – 32

3.F = 1.4 C – 32

4.F = 1.4 C + 32

Question 3 of 36

Question 4 of 36

4. Water freezer at:

1.-273K

2.0K

3. 0°F

4.32°F

Question 4 of 36

Question 5 of 36

5. Reason of glider to remain in air is:

1.convection

2.radiation

3.conduction

4.power

Question 5 of 36

Question 6 of 36

6. Absolute zero is equal to:

1.– 273°C

2.0°C

3.100 K

4.100 °C

Question 6 of 36

Question 7 of 36

7. 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 = m∆T

2.∆Q = cm∆T²

3.∆Q = 2c∆T

4.∆Q = cm∆T

Question 7 of 36

Question 8 of 36

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

1.β= ∆V/V₀∆T

2. β= ∆T/V₀∆V

3. β= ∆T/∆V

4.β= ∆V/∆T

Question 8 of 36

Question 9 of 36

9. 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=cm∆Qv

3.Hv = ∆Qv/m

4.Hv = m/∆Qv

Question 9 of 36

Question 10 of 36

10. In solids, heat is transferred by:

1.convection

2.radiation

3.conduction

4.absorption

Question 10 of 36

Question 11 of 36

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

1.102°F

2.90°F

3.122°F

4.100°F

Question 11 of 36

Question 12 of 36

12. Heat transfers through fluids by the method called:

1. radiation

2. absorption

3.conduction

4.convection

Question 12 of 36

Question 13 of 36

13. Which surface is best reflector of heat?

1.dull black surface

2.shining silvered surface

3.white surface

4.coloured surface

Question 13 of 36

Question 14 of 36

14. The specific heat of water is:

1.1760Jkg⁻¹K⁻¹

2.2500 Jkg⁻¹K⁻¹

3.4200 Jkg⁻¹K⁻¹

4.800 Jkg⁻¹ K⁻¹

Question 14 of 36

Question 15 of 36

15. Rooms are heated using gas heaters by:

1. convection and radiation

2.conduction only both

3. radiation only

4. convection only

Question 15 of 36

Question 16 of 36

16. Thermal conductivity of silver is:

1. 0.08 Wm⁻¹K⁻¹

2.0.2 Wm⁻¹K⁻¹

3. 0.59 Wm⁻¹K⁻¹

4. 1.7 Wm⁻¹K⁻¹

Question 16 of 36

Question 17 of 36

17. In gases, heat is mainly transferred by:

1.conduction

2. molecular collision

3. convection

4. radiation

Question 17 of 36

Question 18 of 36

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

1.small heat capacity

2.low freezing point

3.all the given properties

4.uniform thermal expansion

Question 18 of 36

Question 19 of 36

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

1.470.0

2.920.0

3.387.0

4.903.0

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

1.H₂

2.N₂

3.NH₃

4.CO₂

Question 21 of 36

Question 22 of 36

22. False ceiling is done to:

1.cool the room

2. lower the height of ceiling

3. keep the roof clean

4. insulate the ceiling

Question 22 of 36

Question 23 of 36

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

1. 400

2.245

3. 105

4. 430

Question 23 of 36

Question 24 of 36

24. 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 + α∆T)

4.L = L₀(1 + ∆T)

Question 24 of 36

Question 25 of 36

25. Example of a bad conductor is:

1. gold

2. wool

3. graphite

4. iron

Question 25 of 36

Question 26 of 36

26. Normal human body temperature is:

1.38°F

2.15°F

3.98.6°F

4.37°F

Question 26 of 36

Question 27 of 36

27. Bimetallic strip works on the principle of:

1. contraction of metals

2. both A and B

3. unequal expansion of metals

4.expansion of metals

Question 27 of 36

Question 28 of 36

28. Temperature of ice in freezer is:

1.– 28°C

2.0 °C

3.– 8°C

4.– 18°C

Question 28 of 36

Question 29 of 36

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

1.two times

2.four times

3.three times

4.five times

Question 29 of 36

Question 30 of 36

30. Which of the following effects evaporation?

1.surface area of the liquid

2.all of these

3.air

4.temperature

Question 30 of 36

Question 31 of 36

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

1.3.36 x 10⁵Jkg⁻¹

2.3.36 x 10³Jkg⁻¹

3.336 x 10⁵Jkg⁻¹

4.33.6 x 10⁵Jkg⁻¹

Question 31 of 36

Question 32 of 36

32. 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 32 of 36

Question 33 of 36

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

1.273 – C

2.273 + C

3.273 + F

4.273 – F

Question 33 of 36

Question 34 of 36

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

1.becomes double

2.remains the same

3.becomes half

4. becomes one fourth

Question 34 of 36

Question 35 of 36

35. Which process produces cooling effect?

1.freezing

2.condensation

3. boiling

4. evaporation

Question 35 of 36

Question 36 of 36

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

1.Copper

2.ice

3.water

4.mercury

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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