UP Board Class 12 Physics Chapter 1. We covered all the UP Board Class 12 Physics Chapter 1 in this post for free so that you can practice well for the exam.
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Class 12 Physics MCQs for Competitive Exams
The average K.E. of gas molecules can be determined by knowing :
(A) The number of molecules in the gas
(B) The pressure of the gas-only
(C) The temperature of the gas-only
(D) None of the above is enough by itself
Option c – The temperature of the gas-only
If the RMS velocity of an oxygen molecule at a certain temperature is 0.5 km/s, the RMS velocity for a hydrogen molecule at the same temperature will be :
(A) 2 km/s
(B) 4 km/s
(C) 9 km/s
(D) 16 km/s
Option a – 2 km/s
The RMS velocity of a gas at a given temperature is 300 m/s. What will be the RMS velocity of a gas having twice the molecular weight and half the temperature in K?
(A) 300 m/s
(B) 600 m/s
(C) 75 m/s
(D) 150 m/s
Option d – 150 m/s
A gas is compressed isothermally. The r.m.s. the velocity of its molecules :
(A) increases
(B) decreases
(C) first increases then decrease
(D) remains the same
Option d – remains the same
The temperature of an ideal gas is increased from 120 K to 480 K. If at 120 K the RMS velocity of the gas molecules is V. at 480 K it becomes :
(A) 4V
(B) 2V
(C) V/2
(D) V/4
Option b – 2V
The temperature of a gas is 0°C. Its root mean square velocity will be doubled at
(A) 273 °C
(B) 1092 °C
(C) 819 °C
(D) 103 °C
Option c – 819 °C
To what temperature should hydrogen at 327°C be cooled at constant pressure, so that the root mean square velocity of its molecules becomes half of its previous value? :
(A) – 123 °C
(B) 123 °C
(C) – 100 °C
(D) 0 °C
Option a – – 123 °C
At what temperature is the root mean square velocity of gaseous hydrogen molecules equal to that of oxygen molecules at 47°C? :
(A) 20 K
(B) 80 K
(C) – 73 K
(D) 3 K
Option a – 20 K
The RMS velocity of hydrogen molecules at 300K is 1930 m/s. Then the RMS velocity of oxygen molecules at 1200 K will be :
(A) 482.5 m/s
(B) 965 m/s
(C) 1930 m/s
(D) 3860 m/s
Option b – 965 m/s
The temperature of hydrogen at which the RMS speed of its molecules is equal to that of oxygen molecules at a temperature of 31°C is :
(A) – 216 °C
(B) – 235 °C
(C) – 254 °C
(D) – 264 °C
Option c – – 254 °C
At what temperature the molecules of nitrogen will have the same RMS velocity as the molecules of oxygen at 127°C? :
(A) 77 °C
(B) 350 °C
(C) 273 °C
(D) 457 °C
Option a – 77 °C
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