Solved Multiple Choice Questions | Chapter 10 | 10th Physics | NBF New Book | Federal Board

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1. Why is water used in radiators of automobile as coolant?
(a) It is easily available (b) It is low coast or free
(c) It has large specific heat (d) It has oxygen
2. Which of the following situations is the best example of conduction?
(a) A metal spoon becomes hot when placed in boiling water
(b) Warm air rising near a heater
(c) Sunlight warming the surface of the Earth
(d) A microwave oven heating food
3. Which combination of heat transfer methods would be dominant when you place your hand near, but not touching, a fire?
(a) Conduction and radiation (b) Convection and conduction
(c) Radiation and convection (d) Conduction and insulation
4. What is symbol and what is unit for the heat capacity of an object?
(a) 𝐽°𝐶^(−1) (b) 𝐽〖𝑘𝑔〗^(−1) 𝐾^(−1)
(c) 𝐽𝑘𝑔𝐾^(−1) (d) 𝐽〖𝑘𝑔〗^(−1) 𝐾
5. If the same amount of heat energy is supplied to equal masses of water and copper, why does the temperature of copper increase faster?
(a) Copper has a lower specific heat capacity
(b) Water is poor conductor of heat
(c) Convection in water dissipates heat energy quickly
(d) Radiation from water is stronger
6. The transfer of heat takes place because of density difference in fluids is (a) Conduction (b) Radiation
(c) Convection (d) Insulation
7. Which of the following statements best explains why the Earth experiences more heat from the Sun than the moon, despite being almost the same distance away?
(a) Earth is better conductor than the moon
(b) The earth has greenhouse gases
(c) The Moon reflects most of the Sun’s radiation
(d) Moon traps heat effectively
8. Dull black colour on a surface is the best absorber of radiation, which of the followings is the best radiator?
(a) Dull black surface (b) Shining silver surface
(c) Red coloured surface (d) White surface
9. How does the enhanced greenhouse effect contribute to global warming?
(a) It increases the Earth’s ability to reflect solar radiation
(b) It traps more heat in the Earth’s atmosphere, raising global temperatures
(c) It blocks ultraviolet rays from entering the atmosphere
(d) It increases the Earth’s rotation speed, causing heat buidup
10. What is the primary driving force behind the movement of tectonic plates? (a) Gravitational pull of the Moon (b) Solar radiation
(c) Mantle convection currents (d) Magnetic field of the Earth
11. Which layer of the Earth is composed of partially molten rock that can flow slowly?
(a) Lithosphere (b) Asthenosphere
(c) Mesosphere (d) Outer core
12. Which of the following extreme weather events is most directly associated with rising sea levels?
(a) Tornadoes (b) Wildfires
(c) Hurricanes (d) Earthquakes