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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

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Question 1 of 36

Physics

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

1. 4

2.3

3.1

4. 2

Question 1 of 36

Question 2 of 36

2. The specific heat of water is:

1.800 Jkg⁻¹ K⁻¹

2.1760Jkg⁻¹K⁻¹

3.4200 Jkg⁻¹K⁻¹

4.2500 Jkg⁻¹K⁻¹

Question 2 of 36

Question 3 of 36

3. Temperature of ice in freezer is:

1.– 18°C

2.– 8°C

3.0 °C

4.– 28°C

Question 3 of 36

Question 4 of 36

4. In solids, heat is transferred by:

1.radiation

2.conduction

3.convection

4.absorption

Question 4 of 36

Question 5 of 36

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

1.100°F

2.122°F

3.90°F

4.102°F

Question 5 of 36

Question 6 of 36

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

1.L = L₀(1 – ∆T)

2.L = L₀(1 + α∆T)

3.L = L₀(1 + ∆T)

4.L = L₀(1 – α∆T)

Question 6 of 36

Question 7 of 36

7. In gases, heat is mainly transferred by:

1.conduction

2. molecular collision

3. convection

4. radiation

Question 7 of 36

Question 8 of 36

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

1.273 – C

2.273 + F

3.273 + C

4.273 – F

Question 8 of 36

Question 9 of 36

9. Normal human body temperature is:

1.37°F

2.38°F

3.15°F

4.98.6°F

Question 9 of 36

Question 10 of 36

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

1.470.0

2.920.0

3.903.0

4.387.0

Question 10 of 36

Question 11 of 36

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

1.245

2. 105

3. 430

4. 400

Question 11 of 36

Question 12 of 36

12. 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 12 of 36

Question 13 of 36

13. Heat transfers through fluids by the method called:

1. absorption

2. radiation

3.conduction

4.convection

Question 13 of 36

Question 14 of 36

14. 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 14 of 36

Question 15 of 36

15. Rooms are heated using gas heaters by:

1. convection only

2.conduction only both

3. convection and radiation

4. radiation only

Question 15 of 36

Question 16 of 36

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

1.3.36 x 10⁵Jkg⁻¹

2.33.6 x 10⁵Jkg⁻¹

3.336 x 10⁵Jkg⁻¹

4.3.36 x 10³Jkg⁻¹

Question 16 of 36

Question 17 of 36

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

1.five times

2.two times

3.four times

4.three times

Question 17 of 36

Question 18 of 36

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

1.JkgK⁻¹

2.Jkg⁻¹ K⁻¹

3.JkgK

4.J⁻¹kg⁻¹ K⁻¹

Question 18 of 36

Question 19 of 36

19. 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 = cm∆T

4.∆Q = 2c∆T

Question 19 of 36

Question 20 of 36

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

1.F = 1.4 C – 32

2.F = 1.8 C + 32

3.F = 1.8 C – 32

4.F = 1.4 C + 32

Question 20 of 36

Question 21 of 36

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

1.uniform thermal expansion

2.low freezing point

3.small heat capacity

4.all the given properties

Question 21 of 36

Question 22 of 36

22. Example of a bad conductor is:

1. iron

2. graphite

3. gold

4. wool

Question 22 of 36

Question 23 of 36

23. 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=cm∆Qv

2.Hv = m/∆Qv

3.Hv = m∆Qv

4.Hv = ∆Qv/m

Question 23 of 36

Question 24 of 36

24. Water freezer at:

1.0K

2. 0°F

3.32°F

4.-273K

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. Reason of glider to remain in air is:

1.power

2.convection

3.conduction

4.radiation

Question 26 of 36

Question 27 of 36

27. Which surface is best reflector of heat?

1.dull black surface

2.coloured surface

3.white surface

4.shining silvered surface

Question 27 of 36

Question 28 of 36

28. The specific heat of water is:

1.2500 Jkg⁻¹ K⁻¹

2.4200 Jkg⁻¹ K⁻¹

3.2010 Jkg⁻¹ K⁻¹

4.2100 Jkg⁻¹ K⁻¹

Question 28 of 36

Question 29 of 36

29. Thermal conductivity of silver is:

1. 0.59 Wm⁻¹K⁻¹

2.0.2 Wm⁻¹K⁻¹

3. 0.08 Wm⁻¹K⁻¹

4. 1.7 Wm⁻¹K⁻¹

Question 29 of 36

Question 30 of 36

30. Which process produces cooling effect?

1.condensation

2. boiling

3. evaporation

4.freezing

Question 30 of 36

Question 31 of 36

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

1.Copper

2.ice

3.mercury

4.water

Question 31 of 36

Question 32 of 36

32. Absolute zero is equal to:

1.0°C

2.– 273°C

3.100 K

4.100 °C

Question 32 of 36

Question 33 of 36

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

1. β= ∆T/V₀∆V

2.β= ∆V/∆T

3. β= ∆T/∆V

4.β= ∆V/V₀∆T

Question 33 of 36

Question 34 of 36

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

1.H₂

2.NH₃

3.CO₂

4.N₂

Question 34 of 36

Question 35 of 36

35. False ceiling is done to:

1. insulate the ceiling

2. keep the roof clean

3.cool the room

4. lower the height of ceiling

Question 35 of 36

Question 36 of 36

36. Which of the following effects evaporation?

1.all of these

2.surface area of the liquid

3.air

4.temperature

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