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.
Which of the following properties is not applicable to X-rays? They
travel in straight lines
travel with the speed of light
are deflected by magnetic field
affect photographic films
Correct answer is C
No explanation has been provided for this answer.
For photoelectric emission, the threshold frequency is the
maximum frequency of incident radiation that will eject electrons
minimum fraquency of incident radiation required to eject electrons
frequency which results in the emission of the greater number of electrons
fraquency whch impacts greatest kinetic energy to emitted electrons
Correct answer is B
No explanation has been provided for this answer.
Which of the following practices will lead to losses in electrical power transmission?
using transmission cables of large diameter
transmitting at high voltage and low current
transmitting at relatively low voltage and high current
using a set-up transformer at the production end
Correct answer is C
No explanation has been provided for this answer.
0.15V
0.24V
2.70V
24.00V
Correct answer is B
No explanation has been provided for this answer.
\(\mathit{P} = \frac{RA}{l}\)
\(\mathit{P} = \frac{l}{RA}\)
\(\mathit{P} = \frac{Rl}{A}\)
\(\mathit{P} = \frac{R}{Al}\)
Correct answer is A
resistivity P is directly proportional to the product of resistance and cross-sectional area and inversely proportional to the length of the wire