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Punjab 9th Class Physics Model Paper 7 MCQs Test Online

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Question 1 of 36

Physics

1. 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 = cm∆T

3.∆Q = 2c∆T

4.∆Q = m∆T

Question 1 of 36

Question 2 of 36

2. Which surface is best reflector of heat?

1.dull black surface

2.shining silvered surface

3.coloured surface

4.white surface

Question 2 of 36

Question 3 of 36

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

1.NH₃

2.CO₂

3.H₂

4.N₂

Question 3 of 36

Question 4 of 36

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

1.F = 1.4 C + 32

2.F = 1.4 C – 32

3.F = 1.8 C + 32

4.F = 1.8 C – 32

Question 4 of 36

Question 5 of 36

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

1.mercury

2.ice

3.Copper

4.water

Question 5 of 36

Question 6 of 36

6. Temperature of ice in freezer is:

1.– 8°C

2.– 28°C

3.– 18°C

4.0 °C

Question 6 of 36

Question 7 of 36

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

1.102°F

2.122°F

3.90°F

4.100°F

Question 7 of 36

Question 8 of 36

8. Absolute zero is equal to:

1.100 °C

2.100 K

3.0°C

4.– 273°C

Question 8 of 36

Question 9 of 36

9. Which of the following effects evaporation?

1.all of these

2.surface area of the liquid

3.temperature

4.air

Question 9 of 36

Question 10 of 36

10. Rooms are heated using gas heaters by:

1.conduction only both

2. radiation only

3. convection only

4. convection and radiation

Question 10 of 36

Question 11 of 36

11. 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 = ∆Qv/m

3.Hv = m∆Qv

4.Hv = m/∆Qv

Question 11 of 36

Question 12 of 36

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

1. 4

2.3

3.1

4. 2

Question 12 of 36

Question 13 of 36

13. 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 + α∆T)

4.L = L₀(1 + ∆T)

Question 13 of 36

Question 14 of 36

14. In gases, heat is mainly transferred by:

1.conduction

2. molecular collision

3. convection

4. radiation

Question 14 of 36

Question 15 of 36

15. 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 15 of 36

Question 16 of 36

16. Normal human body temperature is:

1.15°F

2.98.6°F

3.37°F

4.38°F

Question 16 of 36

Question 17 of 36

17. Which process produces cooling effect?

1.condensation

2.freezing

3. boiling

4. evaporation

Question 17 of 36

Question 18 of 36

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

1.all the given properties

2.uniform thermal expansion

3.small heat capacity

4.low freezing point

Question 18 of 36

Question 19 of 36

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

1.903.0

2.920.0

3.387.0

4.470.0

Question 19 of 36

Question 20 of 36

20. Heat transfers through fluids by the method called:

1.conduction

2.convection

3. absorption

4. radiation

Question 20 of 36

Question 21 of 36

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

1.four times

2.three times

3.two times

4.five times

Question 21 of 36

Question 22 of 36

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

1.273 – F

2.273 – C

3.273 + F

4.273 + C

Question 22 of 36

Question 23 of 36

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

1.J⁻¹kg⁻¹ K⁻¹

2.JkgK⁻¹

3.JkgK

4.Jkg⁻¹ K⁻¹

Question 23 of 36

Question 24 of 36

24. Water freezer at:

1.-273K

2.32°F

3.0K

4. 0°F

Question 24 of 36

Question 25 of 36

25. Reason of glider to remain in air is:

1.convection

2.power

3.radiation

4.conduction

Question 25 of 36

Question 26 of 36

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

1. 430

2.245

3. 105

4. 400

Question 26 of 36

Question 27 of 36

27. In solids, heat is transferred by:

1.absorption

2.conduction

3.convection

4.radiation

Question 27 of 36

Question 28 of 36

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

1.c/m

2.mc²

3.mc

4.m/c

Question 28 of 36

Question 29 of 36

29. False ceiling is done to:

1. keep the roof clean

2. insulate the ceiling

3. lower the height of ceiling

4.cool the room

Question 29 of 36

Question 30 of 36

30. The specific heat of water is:

1.4200 Jkg⁻¹K⁻¹

2.800 Jkg⁻¹ K⁻¹

3.2500 Jkg⁻¹K⁻¹

4.1760Jkg⁻¹K⁻¹

Question 30 of 36

Question 31 of 36

31. 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 31 of 36

Question 32 of 36

32. Thermal conductivity of silver is:

1.0.2 Wm⁻¹K⁻¹

2. 1.7 Wm⁻¹K⁻¹

3. 0.59 Wm⁻¹K⁻¹

4. 0.08 Wm⁻¹K⁻¹

Question 32 of 36

Question 33 of 36

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

1.33.6 x 10⁵Jkg⁻¹

2.3.36 x 10⁵Jkg⁻¹

3.3.36 x 10³Jkg⁻¹

4.336 x 10⁵Jkg⁻¹

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. becomes one fourth

3.remains the same

4.becomes half

Question 34 of 36

Question 35 of 36

35. Example of a bad conductor is:

1. gold

2. wool

3. graphite

4. iron

Question 35 of 36

Question 36 of 36

36. Bimetallic strip works on the principle of:

1.expansion of metals

2. unequal expansion of metals

3. both A and B

4. contraction of metals

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