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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

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Question 1 of 36

Physics

1. In gases, heat is mainly transferred by:

1.conduction

2. convection

3. molecular collision

4. radiation

Question 1 of 36

Question 2 of 36

2. 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 = ∆Qv/m

3.Hv=cm∆Qv

4.Hv = m/∆Qv

Question 2 of 36

Question 3 of 36

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

1.Copper

2.ice

3.water

4.mercury

Question 3 of 36

Question 4 of 36

4. Heat transfers through fluids by the method called:

1. absorption

2.conduction

3. radiation

4.convection

Question 4 of 36

Question 5 of 36

5. Reason of glider to remain in air is:

1.conduction

2.radiation

3.convection

4.power

Question 5 of 36

Question 6 of 36

6. Thermal conductivity of silver is:

1. 0.08 Wm⁻¹K⁻¹

2. 0.59 Wm⁻¹K⁻¹

3.0.2 Wm⁻¹K⁻¹

4. 1.7 Wm⁻¹K⁻¹

Question 6 of 36

Question 7 of 36

7. 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 7 of 36

Question 8 of 36

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

1.three times

2.four times

3.two times

4.five times

Question 8 of 36

Question 9 of 36

9. In solids, heat is transferred by:

1.convection

2.conduction

3.absorption

4.radiation

Question 9 of 36

Question 10 of 36

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

1. β= ∆T/V₀∆V

2.β= ∆V/V₀∆T

3. β= ∆T/∆V

4.β= ∆V/∆T

Question 10 of 36

Question 11 of 36

11. Which surface is best reflector of heat?

1.white surface

2.shining silvered surface

3.coloured surface

4.dull black surface

Question 11 of 36

Question 12 of 36

12. 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 12 of 36

Question 13 of 36

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

1.low freezing point

2.small heat capacity

3.all the given properties

4.uniform thermal expansion

Question 13 of 36

Question 14 of 36

14. 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∆T

3.∆Q = 2c∆T

4.∆Q = cm∆T²

Question 14 of 36

Question 15 of 36

15. Which of the following effects evaporation?

1.surface area of the liquid

2.all of these

3.temperature

4.air

Question 15 of 36

Question 16 of 36

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

1.273 + F

2.273 – C

3.273 + C

4.273 – F

Question 16 of 36

Question 17 of 36

17. Normal human body temperature is:

1.38°F

2.37°F

3.15°F

4.98.6°F

Question 17 of 36

Question 18 of 36

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

1. 2

2.3

3.1

4. 4

Question 18 of 36

Question 19 of 36

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

1.Jkg⁻¹ K⁻¹

2.J⁻¹kg⁻¹ K⁻¹

3.JkgK

4.JkgK⁻¹

Question 19 of 36

Question 20 of 36

20. Bimetallic strip works on the principle of:

1. contraction of metals

2. unequal expansion of metals

3.expansion of metals

4. both A and B

Question 20 of 36

Question 21 of 36

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

1.m/c

2.mc

3.mc²

4.c/m

Question 21 of 36

Question 22 of 36

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

1.100°F

2.122°F

3.102°F

4.90°F

Question 22 of 36

Question 23 of 36

23. Temperature of ice in freezer is:

1.0 °C

2.– 8°C

3.– 18°C

4.– 28°C

Question 23 of 36

Question 24 of 36

24. 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 24 of 36

Question 25 of 36

25. The specific heat of water is:

1.800 Jkg⁻¹ K⁻¹

2.1760Jkg⁻¹K⁻¹

3.2500 Jkg⁻¹K⁻¹

4.4200 Jkg⁻¹K⁻¹

Question 25 of 36

Question 26 of 36

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

1. 430

2. 400

3. 105

4.245

Question 26 of 36

Question 27 of 36

27. Which process produces cooling effect?

1. evaporation

2.freezing

3.condensation

4. boiling

Question 27 of 36

Question 28 of 36

28. Absolute zero is equal to:

1.– 273°C

2.0°C

3.100 K

4.100 °C

Question 28 of 36

Question 29 of 36

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

1.remains the same

2.becomes half

3. becomes one fourth

4.becomes double

Question 29 of 36

Question 30 of 36

30. The specific heat of water is:

1.2010 Jkg⁻¹ K⁻¹

2.2100 Jkg⁻¹ K⁻¹

3.4200 Jkg⁻¹ K⁻¹

4.2500 Jkg⁻¹ K⁻¹

Question 30 of 36

Question 31 of 36

31. Example of a bad conductor is:

1. iron

2. graphite

3. gold

4. wool

Question 31 of 36

Question 32 of 36

32. Water freezer at:

1.0K

2.-273K

3. 0°F

4.32°F

Question 32 of 36

Question 33 of 36

33. Rooms are heated using gas heaters by:

1.conduction only both

2. convection only

3. convection and radiation

4. radiation only

Question 33 of 36

Question 34 of 36

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

1.CO₂

2.N₂

3.H₂

4.NH₃

Question 34 of 36

Question 35 of 36

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

1.920.0

2.387.0

3.470.0

4.903.0

Question 35 of 36

Question 36 of 36

36. 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 36 of 36

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Test By Topics	9th Class Physics

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