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.
A transistor is used in the amplification of signals because it
controls the flow of current
consumes a lot of power
allows doping
contains electron and hole carriers
Correct answer is A
No explanation has been provided for this answer.
The particle that is responsible for the nuclear fission in a nuclear reactor is
neutron
proton
electron
photon
Correct answer is A
In a nuclear reaction, neutron is used as a bullet fired into 23592U, to trigger off nuclear chain reaction, which of course is controlled
hysteresis loss
eddy current loss
magnetic flux leakage
heating in the cells
Correct answer is B
No explanation has been provided for this answer.
8%
5%
3%
1%
Correct answer is C
After 5 half-lives, the fraction of any radio-active substance left = (1/2)5 = 1/32
Thus the percentage of the original nuclie = 1/32/1 x 100/1
assuming the original amount is unity percentage left
= 1/32 x 1400/1 = 3.12
The energy associated with the photon of a radio transmission at 3 x 105 Hz is
[h = 6.63 x 10-34Js]
2.00 x 10-28J
1.30 x 10-28J
2.00 x 10- 29J
1.30 x 10-29J
Correct answer is A
A photon of energy E = hf
= 6.63 x 10-34 x 3 x 105
= 19.89 x 10-29
= 2.0 x 10-28J