Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
rectification of signals
conversion of a.c to d.c
amplification of signals
conversion of d.c to a.c
Correct answer is C
transistor serve the same purpose as triode valve, which is amplification of signals.
5.0 x 1016 Hz
2.0 x 1016 Hz
5.0 x 1015 Hz
2.0 x 1015 Hz
No correct option
Correct answer is E
∆E = hf
f = (∆E)/h = (5.44 x 10-19)/6.6 x 10-34 = 8.24 x 1014
In a discharge tube, most of the gas is pumped out so that electricity is conducted at?
low voltage
steady voltage
high pressure
low pressure
Correct answer is C
pumping out of the gas in the discharge tube reduces the pressure inside the tube, therefore, electricity is conducted at low pressure
In alternating current circuit at resonance, the angle of lead or lag is?
π°
(π)/2°
(π)/3°
0°
Correct answer is D
Resonance occurs whenever the phase angle of the circuit is zero, The only way that f = 0 is if XL = XC
500.0J
250.0J
62.5J
50.0J
Correct answer is E
Total inductance,L = L1 + L2 = m
15 + 5 = 20mH = (20)H/1000
1 = 5A
Energy of inductor, (1)/2 L I2
= (1)/2 X (20)/1000 X 5-2
= 0.25 J