Science Physics RRB,IAS,TNPSC,MPSC,UPPSC,NCERT,IES,UPSC,SSC

General Science Physics MCQ-2

Consider the following statements'”*” If there were no capillarity
1. |t would be impossible to use a kerosene lamp.
2. One would not be able to use a straw to consume a soft drink.
3. The blotting paper would fail to function.
4. There would have been no plants on the earth.
Which of the statements given above are correct?

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

The ratio of the speed of X-rays to that of gamma rays is

(A) <1
(B) >1
(C) 1
(D) depends upon the ratio of their frequencies

Match List I (Type of Electromagnetic radiation) with List II (Corresponding Frequency) and select the correct answer using the codes given below
List I- List II
A. Radio waves 1. 1016-1014 Hz
B. Ultraviolet waves 2. 1010 -108 Hz
C. Visible light 3. 106 -103 Hz
D. X-rays 4. 1014 -7×1012Hz
5 . 1018-1016Hz
Codes
ABCD

(A) 2 1 4 5
(B) 1 2 3 4
(C) 5 4 3 2
(D) 1 2 4 3

An inflated balloon rises to a definite height once it starts going up. This balloon cannot rise any further because at that height Pressure

(A) atmosphere pressure reduces to zero
(B) apparent weight of the balloon-reduces to zero
(C) density of the balloon reduces to zero
(D) acceleration due to gravity reduces to zero

Consider the following statements
1. Surface tension of liquid depends on length but not on the area, like the elastic property.
2. SI unit of surface tension is N/m.
3. Surface tension is a scalar quantity because it has no specific direction for a given liquid.
Which of the statement(s) given above is/are correct?

(A) 1 and 2
(B) Only 3
(C) 2 and 3
(D) 1, 2 and 3-

Electromagnetic waves are produced by

(A) charge less particle
(B) a static charge
(C) a moving charge
(D) an acceleration charge

The velocity of sound in air is affected by change in the
1. moisture content of air
2. temperature of air
3. composition of air
4. atmospheric pressure

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

An ideal liquid flows through a horizontal tube of variable diameter. The pressure is lowest where the

(A) velocity is lowest
(B) velocity is highest
(C) diameter is largest
(D) None of the above

Viscosity is the property of liquids by virtue of which they

(A) attract other molecules
(B) become conducting
(C) oppose the relative motion of its parts
(D) push neighbouring molecules

The ozone layer absorbs radiation of wavelength

(A) less than 3x 10 -5 m
(B) more than 3 x 10 -7 m
(C) more than 3×10 -5 m
(D) less than 3 x 10 -7 m

Assertion (A) The velocity of sound in air increases due to the presence of moisture in it.
Reason (R) The presence of moisture in air lowers the density of air.

(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

If we want to calculate the pressure of a liquid at the bottom of vessel, the quantity which is not required to determine it, is

(A) surface area of the bottom of the vessel
(B) height of the liquid column
(C) density of the liquid
(D) acceleration due to gravity at the bottom of the vessel

Bernoulli’s theorem is based on the conservation of

(A) energy
(B) mass
(C) momentum
(D) All of these

Which one of the following has highest frequency?

(A) Cosmic rays
(B) X-rays
(D) Microwaves

When two sound waves are superimposed, beats are produced when they have

(A) different velocities
(B) different phases
(C) different frequencies
(D) different amplitudes and phases

Consider the following statements
1. At any point inside the liquid the pressure exerted by the liquid is directly proportional to its depth from the free surface.
2. At every point and in every direction, the pressure exerted inside the liquid at rest is same.
Which of the statement(s) given above is/are correct?

(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2

The velocity of rain drop attains constant value because of

(A) up thrust of air
(B) surface tension
(C) viscous force exerted by air
(D) air currents