Physics Top MCQs – 15

For seeing objects at the surface of water from a submarine under water, the instrument used is
(A) Kaleidoscope
(B) Periscope
(C) Spectroscope
(D) Telescope
Answer: Option B

If speed of rotation of the earth increases, weight of the body
(A) Increases
(B) Remains unchanged
(C) Decreases
(D) May decrease or increase
Answer: Option C

The largest planet of the solar system is
(A) Earth
(B) Mars
(C) Jupiter
(D) Saturn
Answer: Option C

Which is the closest planet to Sun?
(A) Mars
(B) Venus
(C) Jupiter
(D) Mercury
Answer: Option D

What is the instrument that determines specific gravity of liquids?
(A) Hygrometer
(B) Hydrometer
(C) Gravimeter
(D) Hypsometer
Answer: Option C

Primitive man first learnt
(A) To make fire
(B) To tame animals
(C) To make a wheel
(D) To grow grain
Answer: Option A

In the visible spectrum, the colour having the shortest wavelength is
(A) Green
(B) Yellow
(C) Violet
(D) Blue
Answer: Option C

On a cold day when a room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because
(A) Metals have higher thermal capacity than plastics
(B) Plastics have a lower density than metals
(C) Metals are good conductor of heat
(D) Plastics have a higher thermal conductivity than metals
Answer: Option C