General Science Physics MCQ-9

Insects can move on the surface of water without sinking due to

(A) viscosity of water
(B) surface tension of water
(C) Both (a) and (b)
(D) None of the above

Longitudinal strain is defined when

(A) under a large force change in length is smaller
(B) under a weak force change in length be smaller
(C) under a large force, change in length is larger
(D) None of the above

Assertion (A) Radio waves bend in a magnetic field.
Reason (R) Radio waves are electromagnetic in nature.

(A) Both A and R are individually true and R is the correct explanation of A
(B) Both A and R are individually true, but R is not the correct explanation of A
(C) A is true, but R is false
(D) A is false, but R is true

Kerosene oil rises up in the wick of lantern because of

(A) surface tension
(B) buoyant force of air
(C) diffusion of the oil through the wick
(D) the gravitational pull of the wick

The breaking stress of a wire depend s en

(A) material of the wire
(B) length of the wire
(C) radius of the wire
(D) shape of the cross-section on of the wire

The light wave is

(A) mechanical wave
(B) non-mechanical wave
(C) either mechanical or non-mechanical wave depends upon the medium through which it passes
(D) Only (a) and (c) is correct

The excess of pressure inside a dropper bubble is

(A) directly proportional to its radius
(B) inversely proportional to its surface tension
(C) directly proportional to its mass
(D) inversely proportional to its radius

When deep sea fishes are brought to the surface of the sea, their bodies burst. This is because the blood in their bodies flows at very

(A) high speed
(B) high pressure
(C) low speed
(D) low pressure

The technique used to transmit audio signals in television broadcasts is

(A) amplitude modulation
(B) frequency modulation
(C) pulse code modulation
(D) time division multiplexing

When some detergent is added to water, the surface tension

(A) increases
(B) remains unaffected
(C) decreases
(D) None of the above

lt is difficult to cut things with a blunt knife because

(A) the pressure exerted by knife for a” given force increases with increase in bluntness
(B) a sharp edge decreases the pressure exerted by knife for a given force
(C) a blunt knife decreases the pressure for a given force
(D) a blunt knife decreases the area of intersection

When a stone is dropped on the surface of still water, the waves produced are

(A) longitudinal
(B) transverse
(C) stationary
(D) partly transverse and partly longitudinal

If a liquid wets a solid surface, the angle of contact is

(A) 00,C
(B) less than 900,
(C) greater than 900,
(D) 900,

Assertion (A) Pulling a lawn roller is easier than pushing it. Reason (R) Pushing increases the apparent weight and hence the force of friction.

(A) Both A and R are true and R is the correct explanation of A
(B) Both A and R are true and R is not the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true

Velocity of sound in air
1. decreases with temperature
2. increases with temperature
3. increases with pressure
4. is independent of pressure
5. is independent of temperature Which of the above are true?

(A) 2 and 3
(B) 1, 2 and 3.
(C) 2 and 4
(D) 1,2, 3 and 4

The angle of contact of a liquid with a solid does not depend on

(A) the nature of the liquid and the solid
(B) the medium which exists above the free surface of the liquid
(C) the angle of inclination of the solid to the solid-liquid surface
(D) None of the above

When ice melts, its

(A) volume decreases
(B) volume increases
(C) volume and mass both decrease
(D) volume decreases while mass increases