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.
The process of energy production in the sun is?
nuclear fission
nuclear fusion
electron collision
radioactive decay
Correct answer is B
The process of energy production in the sun is generally by nuclear fusion of hydrogen nuclei, the reaction of which takes place at a tremendous high temperature.
200\(\Omega\)
50\(\Omega\)
\(\frac{100}{\pi}\)
\(\frac{25}{\pi \Omega}\)
Correct answer is A
Given;
L = 2H
F = \(\frac{50}{\pi}\) H\(_{2}\)
X\(_{L}\) = ?
X\(_{L}\) = 2\(\pi\)fL = 2\(\pi\) x \(\frac{50}{\lambda}\) x 2
= 200\(\Omega\)
An astronomical telescope is said to be in normal adjustment when the?
eye is accommodated
focal length of an object lens is longer than that of eye piece
final image is at the near point of eye
final image is at infinity
Correct answer is D
A normal arrangement is an arrangement where the principal focus of objective coincides with the eyepiece so that the final image is at infinity
0.33
0.50
0.67
0.75
Correct answer is D
\(\frac{\text {sin i}}{\text {sin r}}\) = \(\frac{\text {velocity in air}}{\text {velocity in glass}}\)
\(\frac{\text {sin i}}{\text {sin 30}}\) = \(\frac{3 \times 10^{8}}{2 \times 10^{8}}\)
Sin i = \(\frac{3}{4}\) = 0.75
concave mirror of focal length 5cm
concave mirror of focal length 10cm
convex mirror of focal length 5cm
convex mirror of focal length 10cm
Correct answer is C
Concave Mirror: It is a spherical mirror whose outer surface is polished and inner or concave side is reflecting surface.
Convex Mirror: It is a spherical mirror whose inner surface is polished and outer side or convex side is the reflecting surface.
f = \(\frac{m}{4}\) = f = \(\frac{d}{4}\)
f = \(\frac{20}{4}\) = 5cm