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.
Which of the following electromagnetic waves is most energetic?
Radio waves
X-ray
Gamma rays
Ultra-violet rays
Correct answer is C
The gamma rays have the shortest wavelength and therefore, impart the highest photon energy.
meter per second
seconds
hertz
farad
Correct answer is C
The unit of frequency is hertz, abbreviated Hz.
3.3°C
7.0°C
13°C
30.0°C
Correct answer is D
Let the room temperature be X.
We have, \(\frac{3-0}{10-0} = \frac{X-0}{100-0}\)
\(\frac{3}{10} = \frac{X}{100}\)
\(X = \frac{3 \times 100}{10}\)
= 30°C
0.125Hz
1.25Hz
7.50Hz
8.00Hz
Correct answer is B
10 complete oscillations = 8.0s
1 complete oscillation (period) = \(\frac{8}{10}\)s
Frequency = \(\frac{1}{period}\) = \(\frac{1}{0.8} = 1.25Hz\)
Which of the following factors does not increase the rate of evaporation of water in a lake?
Increase in the pressure of the atmosphere
Rise in temperature
Increase in the surface area of the lake
Increase in the speed of the wind
Correct answer is A
The rate of evaporation is increased by the lowering of atmospheric pressure and not its increase. Every other factor stands, for the increase of evaporation process.