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Chapter 1: Heat and Temperature MCQ-4 (in Hindi)
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In this lesson discuss the Heat and temperature most important MCQ's.

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

U
K
Thaks sir
Sir, I think Q.7 ka ans (b) aayega. Q ki 0 to 4 degree pucha hai, 4 degree tak volume decrease hoga aur uske baad me increase hoga
Vishal Garg
a year ago
b nii hoga... because Usme only decrease kha h... but 4 degree se Inc b hone lgega....
Vishal Garg
a year ago
exact 4 degree nii hota... Usse kuch Phle se start ho jata h...
thanks
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4. Heat is associated with (a) (b) (c) 1. kinetic energy of random motion of molecules kinetic energy of orderly motion of molecules total kinetic energy of random and orderly motion of molecules (d) None of these Heat content of a body depends on (a) mass of the body (b) temperature of the body (c) specific heat capacity (d) all of the above Which of the following is not a unit of heat energy? (a) joule (c) calorie 2. 3. (b) kelvin (d) None of these

5. 4. Choose the correct equation for interconversion of temperature scales (a) 100 180 -32 Tc-0 TF -32 TK +273.15 100 (b)180 TK-273.15 180 TE-32 C) 80 TF-32 1C-0 -180 - (d) 100 l

6. 5 Which of the following pairs may give equal numerical values of the temperature of a body? (a) Fahrenheit and Celsius (b) Celsius and Kelvin (c) Kelvin and Reaumur (d) None of these Expansion during heating (a) occurs only in solids b) increases the weight of a material (c) generally decreases the density of a material (d) occurs at the same rate for all liquids and solids 6.

7. 7. When water is heated from 0 C to 4 C, its volume (a) increases (b) decreases (c) does not change (d) first decreases and then increases 4200 J of work is required for (a) 8. increasing the temperature of 10 g of water through 10 C increasing the temperature of 100 g of water through 10 C (b) Cincreasing the temperature of i kg of water through 1o C (d) increasing the temperature of 1O g of water through O C

8. 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

9. 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

10. 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

11. 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

12. 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.