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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

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Question 1 of 36

Physics

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

1.3.36 x 10⁵Jkg⁻¹

2.336 x 10⁵Jkg⁻¹

3.3.36 x 10³Jkg⁻¹

4.33.6 x 10⁵Jkg⁻¹

Question 1 of 36

Question 2 of 36

2. 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 2 of 36

Question 3 of 36

3. 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 3 of 36

Question 4 of 36

4. Which surface is best reflector of heat?

1.shining silvered surface

2.coloured surface

3.white surface

4.dull black surface

Question 4 of 36

Question 5 of 36

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

1.mc

2.c/m

3.m/c

4.mc²

Question 5 of 36

Question 6 of 36

6. Rooms are heated using gas heaters by:

1. convection and radiation

2. convection only

3.conduction only both

4. radiation only

Question 6 of 36

Question 7 of 36

7. In solids, heat is transferred by:

1.radiation

2.convection

3.conduction

4.absorption

Question 7 of 36

Question 8 of 36

8. Example of a bad conductor is:

1. gold

2. graphite

3. wool

4. iron

Question 8 of 36

Question 9 of 36

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

1.becomes double

2. becomes one fourth

3.becomes half

4.remains the same

Question 9 of 36

Question 10 of 36

10. Normal human body temperature is:

1.98.6°F

2.15°F

3.37°F

4.38°F

Question 10 of 36

Question 11 of 36

11. Reason of glider to remain in air is:

1.radiation

2.convection

3.conduction

4.power

Question 11 of 36

Question 12 of 36

12. Which of the following effects evaporation?

1.surface area of the liquid

2.temperature

3.air

4.all of these

Question 12 of 36

Question 13 of 36

13. 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 13 of 36

Question 14 of 36

14. 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 14 of 36

Question 15 of 36

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

1.100°F

2.90°F

3.122°F

4.102°F

Question 15 of 36

Question 16 of 36

16. 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 16 of 36

Question 17 of 36

17. 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 17 of 36

Question 18 of 36

18. Which process produces cooling effect?

1.condensation

2. evaporation

3. boiling

4.freezing

Question 18 of 36

Question 19 of 36

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

1. 105

2.245

3. 430

4. 400

Question 19 of 36

Question 20 of 36

20. Temperature of ice in freezer is:

1.– 8°C

2.– 18°C

3.– 28°C

4.0 °C

Question 20 of 36

Question 21 of 36

21. The specific heat of water is:

1.4200 Jkg⁻¹ K⁻¹

2.2500 Jkg⁻¹ K⁻¹

3.2100 Jkg⁻¹ K⁻¹

4.2010 Jkg⁻¹ K⁻¹

Question 21 of 36

Question 22 of 36

22. Bimetallic strip works on the principle of:

1. unequal expansion of metals

2.expansion of metals

3. both A and B

4. contraction of metals

Question 22 of 36

Question 23 of 36

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

1.mercury

2.water

3.Copper

4.ice

Question 23 of 36

Question 24 of 36

24. In gases, heat is mainly transferred by:

1. convection

2. molecular collision

3.conduction

4. radiation

Question 24 of 36

Question 25 of 36

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

1.3

2.1

3. 4

4. 2

Question 25 of 36

Question 26 of 36

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

1.N₂

2.NH₃

3.CO₂

4.H₂

Question 26 of 36

Question 27 of 36

27. Thermal conductivity of silver is:

1. 0.59 Wm⁻¹K⁻¹

2. 0.08 Wm⁻¹K⁻¹

3. 1.7 Wm⁻¹K⁻¹

4.0.2 Wm⁻¹K⁻¹

Question 27 of 36

Question 28 of 36

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

1.920.0

2.470.0

3.387.0

4.903.0

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. Complete the equation T(K) = ___________.

1.273 – C

2.273 + F

3.273 + C

4.273 – F

Question 30 of 36

Question 31 of 36

31. Heat transfers through fluids by the method called:

1. radiation

2.conduction

3. absorption

4.convection

Question 31 of 36

Question 32 of 36

32. The specific heat of water is:

1.4200 Jkg⁻¹K⁻¹

2.1760Jkg⁻¹K⁻¹

3.2500 Jkg⁻¹K⁻¹

4.800 Jkg⁻¹ K⁻¹

Question 32 of 36

Question 33 of 36

33. Water freezer at:

1. 0°F

2.32°F

3.0K

4.-273K

Question 33 of 36

Question 34 of 36

34. Absolute zero is equal to:

1.100 °C

2.0°C

3.100 K

4.– 273°C

Question 34 of 36

Question 35 of 36

35. 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 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 = m/∆Qv

2.Hv=cm∆Qv

3.Hv = ∆Qv/m

4.Hv = m∆Qv

Question 36 of 36

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Test By Topics	9th Class Physics

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