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.
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
3m
5m
6m
10m
Correct answer is C
Objects distance (u) = image distance (v)
object distance = 3m
|uv| = 3 + 3 = 6m
4
3
2
1
Correct answer is B
f\(_{0}\) = 40H\(_{3}\)
1st overtone = 2f\(_{0}\) = 80H\(_{3}\)
2nd overtone = 3f\(_{0}\) = 120H\(_{3}\)
3rd overtone = 4f\(_{0}\) = 160H\(_{3}\)
4th overtone = 5f\(_{0}\) = 200H\(_{3}\)
\(\therefore\) Number of overtones between 40H\(_{3}\) and 180H\(_{3}\) = 3
If a sound wave goes from a cold air region to a hot air region, its wavelength will?
increase
decrease
decrease then increase
remain constant
Correct answer is A
No explanation has been provided for this answer.