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Chapter 1: Heat and Temperature MCQ-6 (in Hindi)
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In this lesson discuss the Heat and temperature most important MCQ's for Railway AlP CBT2.

Vishal Garg
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3. 22. Newton's law of cooling is also applicable to (a) convection losses. (b) natural convection losses (c) forced convection losses. (d) conduction losses. If a substance is hot, its particles (a) (b) (c) (d) Metals are best (a) (b) (c) (d) 23. move more faster than the cooler object move more slower than the cooler object move at the same rate as the cooler object May move faster it slower than the cooler object. 24. insulators of heat conductors of heat sharers of heat insulators of electricity

4. An example of conductor of heat is (a) paper (c) air 25. (b) cloth (d) aluminum 26. Heat capacity depends on (a) change in temperature (b) Mass of body (c) Nature of substance (d) All the above 27. Heat bring change (a) physical (c) reversible The temperature at which liquid changes into vapour is called as: (a) melting point (c) expansion point (b) chemical (d) periodic 28. (b) boiling point (d) expansion point

5. 28. The temperature at which liquid changes into vapour is called as: (a) melting point (c) expansion point It is the process of heat transfer from a hot body to a colder body without heating the space between the two is called as: (a) Conduction (c) concection point At what factor heat absorbed on radiation by body depends on? (a) distance between body (b) source of heat (c) its colour (d) All the above b) boiling point (d) expansion point 29. (b) Radiation (d) absorption 30.

6. A cold steel spoon is dipped in a cup ofhot milk. It transfers heat to its other end by the process of (a) Convection (c) Absorption Why conduction is only possible in solids: (a) (b) 31. (b) Conduction (d) Radiation 32. particles of solids are closely packed heat is transferred from the hotter end to the colder end of an object heat is transferred from the colder end to the hotter end of an object (c) (d) both (a) and (b)

7. An iron ball at 40 C is dropped in a mug containing water at 40 C. The heat will (a) not flow from iron ball to water or from water to iron 33. (b) (c) (d) ball flow from iron ball to water flow from water to iron ball none of the above 34. Clothes of colours absorb heat better than clothes colours. (b) dark, light (d) none of the above (a) light, dark (c) soft, dark The water is poor conductors of heat so do not heated by: (a) absorption (c) radiation 35. (b) conduction (d) convection

8. The materials which allow heat to pass through them easily are called as: (a) insulators . (b) conductors of heat (c) semi conductors (d) none of the above 36. 37. Stainless steel pans are usually provided with copper bottoms. The reason for this could that. (a) copper bottom makes the pan more durable such pans appear colorful copper is a better conductor of heat than the stainless steel (c) (d) none of the above

9. The equation relating the heat transfer rate glass window consists of: (a) surface area (b) thickness (c) thermal conductivity value (d) All the above Absolute zero on Kelvin scale is equal to (a) 373K (c) 0K 38. 39. (b) (d) 273 K None of above

10. 40. Temperature of core of earth is equal to 3727 C. This temperature in Kelvins is equal to (a) 4000K (c) 3454HK Boiling point of mercury is equal to 630 K. This temperature in Celsius is equal to (a) 357 C (c) 903 0 (b) 3727K (d) None of above 41. (b) 630 0C (d) None of above

11. Heat applied to a piece of metal will cause (a) (b) (c) (d) Heat capacity of a substance is equal to (a) amount of heat required to raise temperature ofa 1 kg 44. increase in its mass increase in its volume increase in its density increase in its internal energy 45. (b) amount of heat required to raise temperature of a (c) amount of heat required to change phase of a (d) amount of heat required to change phase of a of a substance by 1 K substance by 1 K substance from solid to liquid without any change in temperature substance from liquid to gas without any change in temperature