Physics XII Chapter Heat & Thermodynamics

Physics XII

Heat & Thermodynamics

1. According to kinetic theory of gases the size of the molecule is:

a) None of these
b) Much smaller than the separation between the molecules
c) Much larger than the separation between molecules
d) Both a and b
2. Collision between gas molecules are perfectly:

a) In-elastic
b) Elastic
c) Both elastic and In-elastic
d) None of these
3. ' R' is called :

a) Universal gas constant
b) Liquid constant
c) Constant for Entropy
d) Heat constant
4. Temperature of human body in Kelvin scale is:

a) 310 K
b) 20 K
c) 273 K
d) 325 K
5. Hotness or coldness of an object is expressed as:

a) Thermal energy
b) Temperature
c) Heat
d) Chemical energy
6. On a hot day or in hot climate white clothes or the clothes with light colour are worn because:

a) Best radiator
b) Good absorber
c) Good Emitter
d) They are good reflectors
7. In all natural processes where heat flows from one system to another, there is always a net increase in :

a) Work
b) Volume
c) Pressure
d) Entropy
8. The temperature of a normal human body is 98.6 F, this temperature in centigrade is:

a) 29.5 °C
b) 37 °C
c) 42.5 °C
d) 33.5 °C
9. One °C is equal to:

a) 1 div F
b) 1.8 div F
c) 2.16 div F
d) 13.5 div F
10. If the volume of given mass of a gas is doubled at atmospheric pressure at 150 centigrade then its new temperature will be:

a) 300 °C
b) 573 °C
c) 745 °C
d) 600 °C
11. When we heat a substance, energy associated with its atoms & molecules:

a) Doest not change
b) Increases
c) None of these
d) Decreases
12. If the work done by the system is at the cost of its internal energy than,

a) Internal energy of the system increases
b) Internal energy of the system decreases
c) None of these
d) Does not change
13. Work done on the system is considered as:

a) Positive
b) Negative
c) None of these
d) Remains unchanged
14. Adiabatic change occurs when the gas expands or compressed:

a) Rapidly
b) Moderately
c) Slowly
d) Gradually
15. The curve representing as isothermal process is called:

a) Isotherm
b) Adiabatic
c) Hyperbola
d) Parabola
16. The process in which pressure remains constant is called:

a) Isothermal
b) Adiabatic
c) Isobaric
d) Isotropic
17. Heat required to raise the temperature of one mole of a substance through one deg Kelvin is called:

a) Molar specific heat
b) Molar specific heat capacity
c) Molar heat capacity
d) All of these
18. The efficiency of a heat engine whose low temperature is at 17C and the high temperature 200C is:

a) 23%
b) 38%
c) 45%
d) 70%
19. For a gas obeys Boyles Law if the pressure increases by 1%, then volume decreased by:

a) 1 /100
b) 1/2 %
c) 2%
d) 100/ 1 %
20. When a gas is heated in a sealed container, then which statement is applicable:

a) Force of attraction between the molecules increases
b) All are applicable
c) The average speed of gas molecules remains the same
d) The average distance between gas molecules
21. The efficiency of Carnot engine depends upon on the:

a) Both a & b
b) Nature of working substance
c) Temperature of hot and cold reservoirs
d) None of these
22. The unit of thermodynamic scale is:

a) Centigrade
b) Kelvin
c) None of these
d) Fahrenheit
23. How many process does a four stroke engine undergoes:

a) 4
b) 3
c) 1
d) 2
24. The concept of entropy was introduces into the study of thermodynamics:

a) Celsius
b) Carnot
c) Coulombs
d) Kelvin
25. Entropy is:

a) State
b) Both a & b
c) State function
d) None of these
26. When heat is added into the system entropy is:

a) Constant process
b) Positive
c) Negative
d) None of these
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