Physics Quiz Set 3

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Question 1

An iron ball and a wooden ball of same radius are released from a height ‘h’ in vacuum. Which of the two balls would take more time to reach the ground?

A	Iron ball
B	Both would take same time
C	Wooden ball
D	None of these

Question 2

If an object undergoes a uniform circular motion, then its

A	acceleration remains uniform
B	velocity changes
C	speed changes
D	velocity remains uniform

Question 3

Which one of the following remains constant while throwing a ball upward ?

A	Displacement
B	Kinetic energy
C	Acceleration
D	Velocity

Question 4

A passenger in a moving train tosses a five rupee coin. If the coin falls behind him, then the train must be moving with a uniform

A	acceleration
B	deceleration
C	speed
D	velocity

Question 5

An athlete diving off a high springboard can perform a variety of exercises in the air before entering the water below. Which one of the following parameters will remain constant during the fall?

A	The athlete’s linear momentum
B	The athlete’s moment of inertia
C	The athlete’s kinetic energy
D	The athlete’s angular momentum

Question 6

Statement A : While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper. Statement B : Friction always opposes motion.

A	Statement A is correct
B	Statement B is correct.
C	Both statements are correct.
D	Both statements are incorrect

Question 7

Kerosene oil rises up in a wick of lantern because of

A	capillarity
B	buoyant force
C	diffusion of oil through the wick
D	None of the above

Question 8

The tendency of a liquid drop to contract and occupy minimum area is due to :

A	surface tension
B	viscosity
C	density
D	vapour pressure

Question 9

Timbre is called the quality of sound. One can recognise the voice of a familiar human being or instrument without actually seeing them. This quality is associated with

A	material of the body
B	overtones present in the sound
C	shape of the body
D	all of the above

Question 10

In which one of the following cases Ohm’s law is not valid?

A	Wire bound resistor
B	Potentiometer
C	Junction diode
D	Electric bulb

Question 11

The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for

A	a microscope
B	a telescope
C	both microscope and telescope
D	neither microscope nor telescope

Question 12

Yellow colour light is used as fog light because yellow colour

A	light is most scattered by fog
B	has the longest wavelength among all colours
C	has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red
D	has the shortest wavelength among all colours not already reserved for other purpose

Question 13

The main constituent of biogas is

A	methane
B	carbon dioxide
C	hydrogen
D	hydrogen sulphide

Question 14

Propane is used instead of natural gas on many farms and in rural areas. Why is propane often used instead of natural gas?

A	It’s safer
B	It’s portable
C	It’s cleaner
D	It’s cheaper

Question 15

Which part of the solar cooker is responsible for green house effect?

A	Coating with black colour inside the box
B	Mirror
C	Glass sheet
D	Outer cover of the solar cooker

Question 16

At absolute zero, Si acts as

A	non-meta
B	metal
C	insulator
D	None of these

Question 17

If the focal length of the biconvex lens is 25 cm, then the power of the lens will be

A	+ 4 dioptre
B	– 4 dioptre
C	+ 0.04 dioptre
D	– 0.04 dioptre

Question 18

Which one among the following denotes the smallest temperature

A	1° on the Celsius scale
B	1° on the Kelvin scale
C	1° on the Fahrenheit scale
D	1° on the Reaumur scale

Question 19

Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent

A	reduces drastically the surface tension between water and oil
B	increases the surface tension between water and oil
C	increases the viscosity of water and oil
D	decreases the viscosity in detergent mixed water

Question 20

For a given mass and size, moment of inertia of a solid disc is

A	more than that of a ring
B	less than that of a ring
C	equal to that of a ring
D	depend on the material of ring and disc

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Physics Quiz Set 3

Physics Quiz Set 3

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Physics Quiz Set 3

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