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 has the highest frequency?
utra - violet rays
radio waves
x - rays
infrared - rays
Correct answer is C
r - rays has the highest frequency followed by X - rays, ultraviolet ray, visible light intra - red and the least is radio weaves
Which of the following types of waves needs a medium for propagation?
sound waves
light waves
radio waves
x - rays
Correct answer is A
Sound is the only mechanical wave among the rest which are electromagnetic waves.
Which of the following could be effectively used to reduce friction?
kerosene
grease
water
petrol
Correct answer is B
grease is more viscous than the rest of the liquids
I and II only.
II and III only.
I, II and III only.
I and III only.
Correct answer is A
Pressure in liquid is independent of cross sectional area of the container/ liquid
∴ the correct options are I & II
80 J
500 J
300 J
120 J
Correct answer is B
Efficiency = \( \frac{\text{work output}}{\text{work input}} \times \frac{100}{1} \)
= 40 = \( \frac{20 \times 10 }{x} \times \frac{100}{1} \)
= 500J