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.
If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
30o
42o
45o
50o
Correct answer is A
sin c = \(\frac{1}{n}\) = \(\frac{1}{2}\)
c = sin-1\((\frac{1}{n})\)
= 30o
1.5 x 108ms-1
3.0 x 108ms-1
2.0 x 108ms-1
6.0 x 108ms-1
Correct answer is C
1.5 = \(\frac{3 \times 10^8}{v}\)
v = 2.0 x 108ms-1
Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?
He cannot see distant objects clearly
Rays of light from a close object are focused in front of his retina
His eye ball is too long
Parallel rays of light are focused behind his retina
Correct answer is D
No explanation has been provided for this answer.
12cm
24cm
48cm
108cm
Correct answer is B
F = \(\frac{uv}{u + v}\)
v = 3u
18 = \(\frac{3u \times u}{3u + u}\)
u = 24cm
When an object is placed very close to the pole of a concave mirror, the virtual image obtained is
diminished and upright
diminished and inverted
enlarged and inverted
enlarged and upright
Correct answer is D
No explanation has been provided for this answer.