Punjab 9th Class Physics Model Paper 7 MCQs Test Online

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∆T

2.∆Q = m∆T

3.∆Q = cm∆T²

4.∆Q = 2c∆T

Question 1 of 36

Question 2 of 36

2. The specific heat of water is:

1.4200 Jkg⁻¹K⁻¹

2.2500 Jkg⁻¹K⁻¹

3.800 Jkg⁻¹ K⁻¹

4.1760Jkg⁻¹K⁻¹

Question 2 of 36

Question 3 of 36

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

1.273 – F

2.273 + F

3.273 + C

4.273 – C

Question 3 of 36

Question 4 of 36

4. 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 4 of 36

Question 5 of 36

5. Thermal conductivity of silver is:

1. 1.7 Wm⁻¹K⁻¹

2. 0.59 Wm⁻¹K⁻¹

3.0.2 Wm⁻¹K⁻¹

4. 0.08 Wm⁻¹K⁻¹

Question 5 of 36

Question 6 of 36

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

1.mc²

2.m/c

3.c/m

4.mc

Question 6 of 36

Question 7 of 36

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

1.122°F

2.100°F

3.102°F

4.90°F

Question 7 of 36

Question 8 of 36

8. False ceiling is done to:

1.cool the room

2. keep the roof clean

3. lower the height of ceiling

4. insulate the ceiling

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 = ∆Qv/m

2.Hv=cm∆Qv

3.Hv = m/∆Qv

4.Hv = m∆Qv

Question 9 of 36

Question 10 of 36

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

1.N₂

2.CO₂

3.H₂

4.NH₃

Question 10 of 36

Question 11 of 36

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

1.remains the same

2.becomes double

3.becomes half

4. becomes one fourth

Question 11 of 36

Question 12 of 36

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

1.ice

2.Copper

3.mercury

4.water

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. Example of a bad conductor is:

1. gold

2. iron

3. wool

4. graphite

Question 14 of 36

Question 15 of 36

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

1.β= ∆V/∆T

2. β= ∆T/V₀∆V

3.β= ∆V/V₀∆T

4. β= ∆T/∆V

Question 15 of 36

Question 16 of 36

16. In gases, heat is mainly transferred by:

1.conduction

2. convection

3. molecular collision

4. radiation

Question 16 of 36

Question 17 of 36

17. Normal human body temperature is:

1.98.6°F

2.38°F

3.37°F

4.15°F

Question 17 of 36

Question 18 of 36

18. Absolute zero is equal to:

1.0°C

2.100 °C

3.100 K

4.– 273°C

Question 18 of 36

Question 19 of 36

19. Which surface is best reflector of heat?

1.shining silvered surface

2.white surface

3.coloured surface

4.dull black surface

Question 19 of 36

Question 20 of 36

20. Reason of glider to remain in air is:

1.convection

2.radiation

3.conduction

4.power

Question 20 of 36

Question 21 of 36

21. 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 21 of 36

Question 22 of 36

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

1.245

2. 430

3. 400

4. 105

Question 22 of 36

Question 23 of 36

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

1.Jkg⁻¹ K⁻¹

2.JkgK

3.JkgK⁻¹

4.J⁻¹kg⁻¹ K⁻¹

Question 23 of 36

Question 24 of 36

24. 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 24 of 36

Question 25 of 36

25. Water freezer at:

1. 0°F

2.32°F

3.-273K

4.0K

Question 25 of 36

Question 26 of 36

26. 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 26 of 36

Question 27 of 36

27. Which process produces cooling effect?

1.freezing

2. boiling

3.condensation

4. evaporation

Question 27 of 36

Question 28 of 36

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

1.920.0

2.387.0

3.470.0

4.903.0

Question 28 of 36

Question 29 of 36

29. 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 29 of 36

Question 30 of 36

30. Temperature of ice in freezer is:

1.– 28°C

2.0 °C

3.– 18°C

4.– 8°C

Question 30 of 36

Question 31 of 36

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

1.low freezing point

2.all the given properties

3.uniform thermal expansion

4.small heat capacity

Question 31 of 36

Question 32 of 36

32. Rooms are heated using gas heaters by:

1.conduction only both

2. radiation only

3. convection only

4. convection and radiation

Question 32 of 36

Question 33 of 36

33. In solids, heat is transferred by:

1.conduction

2.absorption

3.convection

4.radiation

Question 33 of 36

Question 34 of 36

34. Which of the following effects evaporation?

1.temperature

2.surface area of the liquid

3.air

4.all of these

Question 34 of 36

Question 35 of 36

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

1.3

2. 4

3.1

4. 2

Question 35 of 36

Question 36 of 36

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

1.three times

2.four times

3.five times

4.two times

Question 36 of 36

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Punjab 9th Class Physics Model Paper 7 MCQs Test Online