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Chapter 1: Heat and Temperature MCQ-5 (in Hindi)
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In this lesson discuss the most important questions of Heat and temperature.

Vishal Garg
Mechanical Engineer | Unacademy Plus Educator | Railway Category Expert | Follow me to learn Reasoning |

U
Unacademy user
thnks a lot mam very helpful
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  4. Triple point of water is (a) 273.16 F (c) 27316 C Which of the following will expand the most for same rise in temperature? (a) Aluminium (c) Wood 9. (b) 273.16K (d) 273.16 R 10. (b) (d) Glass All will expand same 11. Which of the following is a poor conductor of heat? (a) Copper (c) Mercury (b) Concrete (d) Air 12. Which of the following is the unit of specific heat (a) (c) Jkg C-1 kg C/J (b) J/kg C (d) J/kg C-2


  5. TF -32 180 , relates the Fahrenheit and = 13. The equation 100 Cels us scale temperature. The TF versus Tc graph will be a (a) straight line parallel to x-axis (b) straight line parallel to y-axis (c) straight line inclined to x-axis (d) parabolic curve The value of molar heat capacity at constant temperature is (a) zero (c) unity 14. (b) infinity (d) 4.2 15. The latent heat of vaporization of a substance is always (a) greater than its latent heat of fusion (b) greater than its latent heat of sublimation (c) equal to its latent heat of sublimation (d) less than its latent heat of fusion


  6. d...B... ofheat energy required some material as a 16 transport medium Hear, A and B refer to (a) conduction, radiation (b) radiation, convection (c) conduction, convection (d) radiation, evaporation Which law is obeyed when temperature difference between the body and the surroundings is small? (a) Stefan's law (c) Planck's law 17. (b) (d) Newton's law of cooling All of these 18. Heat is transmitted from higher to lower temperature through al mass motion of the molecules in actu (a) conduction (c) radiation (b) convection (d) None of these


  7. 19. Lamp black absorbs radiant heat which is near about (a) (c) 90% 100% (b) 98% (d) 50% 20. At temperature T, the emissive power and absorptiorn power of a body for certain wavelength are ei and a, respectively, then (a) ei - a (b) ei ai (c) ei * ai (d) there will not be any difinite relation between ej and 21. Newton's law of cooling is applicable for (a) any excess of temperature over the surrounding. (b) small excess of temperature over the surrounding. (c) large excess of temperature over the surrounding. (d) very large excess of temperature over the surrounding


  8. 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


  9. 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


  10. 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.