Physics Past Questions and Answers

In alternating current circuit at resonance, the angel of lead or lag is

A Ï€Â°
B (π)/2°
C (Ï€)/3Â°
D 0Â°

Question 32:

In a discharge tube, most of the gas is pumped out so that electricity is conducted at

A Low voltage
B Steady voltage
C High pressure
D Low pressure

Question 33:

The ground stated energy for the hydrogen atom is 5.44 x 10^-19J . If an electron drops from zero energy to ground state, calculate the frequency of the emitted radiation.
[h = 6.6 x 10^-34 Js]

A 5.0 x 10¹⁶ Hz
B 2.0 x 10¹⁶ Hz
C 5.0 x 10¹⁵ Hz
D 2.0 x 10¹⁵ Hz
E No correct option

Question 34:

The ground stated energy for the hydrogen atom is 5.44 x 10^-19J . If an electron drops from zero energy to ground state, calculate the frequency of the emitted radiation.
[h = 6.6 x 10^-34 Js]

A 5.0 x 10¹⁶ Hz
B 2.0 x 10¹⁶ Hz
C 5.0 x 10¹⁵ Hz
D 2.0 x 10¹⁵ Hz
E No correct option

Question 35:

Two cars moving in the same direction have speeds of 100 kmh^-1 and 130 kmh^-1 what is the velocity of the faster car as measured by an observer in the slower car?

A 30 kmh^-1
B 130 kmh^-1
C 200 kmh[sup][/sup]
D 230 kmh^-1