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.
slope of line PQ
Reciprocal of either OP or OQ
Length OP or OQ
area under the graph E ratio OP/OQ
Correct answer is B
The intercept on either of the axes of the graph of \(\frac{1}{u}\) against \(\frac{1}{v}\) gives the value of \(\frac{1}{f}\). Hence, the reciprocal of this intercecpt gives the value of the focal length.
The wave motion above has a frequency
0.1Hz
0.2Hz
5Hz
10Hz
100Hz
Correct answer is C
No explanation has been provided for this answer.
The effect of closing the key K in the circuit shown above would be to
increase the current by 0.6A
reduce the current by 0.6A
increase the current by 0.4A
keep the current unchanged
Correct answer is C
When K is open, the total resistance
R = 8\(\Omega\) + 2\(\Omega\) = 10\(\Omega\)
I = \(\frac{V}{R}\) = \(\frac{6}{10}\)
= 0.6A
When K is closed, we have
\(\frac{1}{R}\) = \(\frac{1}{8}\) + \(\frac{1}{8}\)
⇒ \(\frac{1}{R}\) = \(\frac{1}{4}\)
⇒ R = 4\(\Omega\)
The total resistance R = 4\(\Omega\) + 2\(\Omega\)
= 6\(\Omega\)
I = \(\frac{6}{6}\)
= 1A
Hence, I = 1A - 0.6A = 0.4A increase
\( 15^{\circ} \)
\( 30^{\circ} \)
\( 45^{\circ} \)
\( 60^{\circ} \)
\( 75^{\circ} \)
Correct answer is B
No explanation has been provided for this answer.
\( \alpha = \beta \)
the efractive index of glass is \( \frac{sin\theta}{sin\alpha} \)
The ray suffers total internal reflection if \( \beta \) is greater than the critical angle
the efractive index of glass is \( \frac{sin\alpha}{sin\beta} \)
Correct answer is D
No explanation has been provided for this answer.