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.
In a compound microscope, the objective and the eye piece focal lengths are
At infinity
Long
Short
The same
Correct answer is C
No explanation has been provided for this answer.
The focal length of a concave mirror is 2.0cm. If an object is placed 8.0cm from it, the image is at
2.7m
2.0m
2.3m
2.5m
Correct answer is A
\(\frac{1}{U} + \frac{1}{V} = \frac{1}{f}\)
\(\frac{1}{8} + \frac{1}{V} = \frac{1}{2}\)
\(V = \frac{8}{3}\)
\(V = 2.7cm\)
An object is placed 10m from a pinhole camera of length 25cm. Calculate the linear magnification.
2.5x102
2.5x10-2
2.5x10-1
2.5x101
Correct answer is B
\(\text{Linear Magnification} = \frac{\text{Length of Camera}}{\text{Distance of the Object}}\)
\(\text{Linear Magnification} = \frac{25}{1000}\)
\(\text{Linear Magnification} = 2.5 \times 10^{-2}\)
528m
66m
136m
264m
Correct answer is C
Time for echo both ways = 0.8
Therefore time for echo in 1 way = 0.8/2 = 0.4
Distance = Speed x time
Distance = 340 x 0.4
Distance = 136m
2.0x102Hz
4.5x103Hz
2.0x103Hz
4.5x102Hz
Correct answer is C
Wavelength = 15cm = 0.15m
Velocity = 300m/s
V = fx
F = V/Wavelength
F = 300/0.15 Hertz
F = 2 x 103Hz