General Science - Physics MCQs - Set 6

1)   Which of the following factors do not affect the value of modulus of elasticity of a body?

a. Nature of material
b. Temperature of the body
c. Length and volume and of the body
d. None of the above
Answer  Explanation 

ANSWER: Length and volume and of the body

Explanation:
Modulus of elasticity (E) depends upon the nature of material of the body and the manner in which the body is deformed. Modulus of elasticity (E) depends upon the temperature of the body. Modulus of elasticity (E) is independent of the dimensions (length, volume etc.) of the body


2)   What is the shape of meniscus when angle of contact is greater than 90°?

a. Concave
b. Convex
c. Plane
d. None of the above
Answer  Explanation 

ANSWER: Convex

Explanation:
When angle of contact is greater than 90°, the shape of meniscus is convex. When angle of contact is less than 90°, the shape of meniscus is concave. When angle of contact is equal to 90°, the shape of meniscus is plain.


3)   Which is correct about the height of a capillary column of a liquid, at a particular temperature, as per Jurin’s law?

a. equal to the diameter of the tube
b. directly proportional to the diameter of the tube
c. inversely proportional to the diameter of the tube
d. half of the diameter of the tube
Answer  Explanation 

ANSWER: inversely proportional to the diameter of the tube

Explanation:
Jurin’s law: the height of a capillary column of a liquid at a particular temperature is inversely proportional to the diameter of the tube.


4)   What do we call the potential energy of surface molecules per unit area of the surface?

a. Surface energy
b. Surface Tension
c. Reynolds number
d. Potential constant
Answer  Explanation 

ANSWER: Surface energy

Explanation:
The potential energy of surface molecules per unit area of the surface is called as surface energy. Some work is required to be done, in bringing a molecule from the interior of the liquid to the free surface, against the intermolecular force of attraction. This work which is stored as potential energy of the molecule on the surface.


5)   Which of the following is the SI unit of Kinematic viscosity?

a. m³/s
b. Kg/s
c. m s-¹
d. m²/s
Answer  Explanation 

ANSWER: m²/s

Explanation:
The SI unit of kinematic viscosity is the square meter per second [m²/s]. It is denoted by ν(nu).


6)   Which of these is a physical quantity which completely express the position and direction of motion of the particle?

a. Frequency
b. Displacement
c. Phase
d. Time period
Answer  Explanation 

ANSWER: Phase

Explanation:
Phase of a vibrating particle at any instant is a physical quantity, which completely express the position and direction of motion, of the particle at that instant with respect to its mean position.


7)   What is the phase of a vibrating particle at t = 0 known as?

a. epoch
b. eon
c. path difference
d. period
Answer  Explanation 

ANSWER: epoch

Explanation:
Initial phase or epoch is the phase of a vibrating particle at t = 0. When t = 0; Phase is the angle of epoch.


8)   When are the two particles said to be in same phase?

a. if the phase difference between them is an even multiple of π
b. if the path difference is an even multiple of (λ / 2)
c. if the time interval is an even multiple of (T/ 2)
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
Two vibrating particle are said to be in same phase, if the phase difference between them is an even multiple of π or path difference is an even multiple of (λ / 2) or time interval is an even multiple of (T/ 2).


9)   Which of these is correct about Simple Harmonic Motion?

a. Restoring force is directly proportional to the displacement from mean position
b. Restoring force is equal to the displacement from mean position
c. Restoring force is inversely proportional to the displacement from mean position
d. Restoring force is half of the displacement from mean position
Answer  Explanation 

ANSWER: Restoring force is directly proportional to the displacement from mean position

Explanation:
Simple harmonic motion is a special type of periodic motion, in which a particle moves to and fro repeatedly about a mean position under a restoring force which is always directed towards the mean position and whose magnitude at any instant is directly proportional to the displacement of the particle from the mean position at that instant. Restoring force Displacement of the particle from mean position.


10)   What are the oscillations of a body whose amplitude goes on decreasing with time called as?

a. Free oscillation
b. Maintained oscillation
c. Forced oscillation
d. Damped oscillation
Answer  Explanation 

ANSWER: Damped oscillation

Explanation:
The oscillation of a body whose amplitude goes on decreasing with time are defined as damped oscillation.