Physics 12th Important Questions for State Board. We covered all the Physics 12th Important Questions for State Board in this post for free so that you can practice well for the exam.
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12th Important Objective Questions for Students
Heat is transferred most rapidly by the process of
(A) Conduction
(B) Convection
(C) Radiation
(D) Combustion
Option c – Radiation
For a perfectly black body, its absorptive power is :
(A) 1
(B) 0.5
(C) 0
(D) infinity
Option a – 1
Heat is transmitted from higher to lower temperatures through the actual mass motion of the molecules in
(A) Conduction
(B) Convection
(C) Radiation
(D) Combustion
Option b – Convection
An electric heater, kept in a vacuum, is heated continuously by passing an electric current. Its temperature :
(A) Will go on rising with time
(B) Will stop rising after some time as it will lose heat to the surroundings by conduction
(C) Will rise for some time and thereafter will start falling
(D) Will become constant after some time because of loss of heat due to radiation
Option d – Will become constant after some time because of loss of heat due to radiation
Calculate the RMS velocity of molecules of a gas of which the ratio of two specific heats is 1.42 and the velocity of sound in the gas is 500 m/s :
(A) 727 m/s
(B) 527 m/s
(C) 927 m/s
(D) 750 m/s
Option a – 727 m/s
Sun’s heat reaches us by
(A) Conduction
(B) Convection
(C) Radiation
(D) Scattering
Option c – Radiation
The ratio of specific heat of a gas is 1.4. Its specific heat at a constant volume is 4.96 cal/mol K. Then the universal gas constant is
(A) 8.3 cal/mol K
(B) 0.0821 cal/mol K
(C) 1.984 cal/mol K
(D) 62.3 cal/mol K
Option c – 1.984 cal/mol K
Specific heats of carbon dioxide at constant pressure and constant volume are 833 J/kg Kand 641 J/kg K respectively. The universal gas constant Ris :
(A) 192 J/kmol K
(B) 0.821 J/kmol K
(C) 8.31 J/kmol K
(D) 8448 J/kmol K
Option d – 8448 J/kmol K
We covered all the physics 12th important questions for state board above in this post for free so that you can practice well for the exam.
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