General Science Physics MCQ-8

The elastic potential energy of a body is
1. Work done by the external force against the deforming force
2.Work done against the external force by the deforming force
3. The sum of work done by the external force and the deforming force.
Which one option is true?

(A) 1
(B) 1 and 3
(C) 1, 2 and 3
(D) None of these

Match List I (Electromagnetic Wave) with List II (Discoverer) and select the correct answer using the codes given below
List I————— List II
A. Infrared waves 1. Bitter
B. Ultraviolet rays 2. Newton
C. X-rays 3. Herschell
D. Visible rays 4. W.Roentgen
Codes
ABCD

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

Assertion (A) If a piece of ice floats on a water surface, then its [1/10] th part of the total volume remains above the surface and[9/10] th part remains submerged.
Reason (R) This is because the ratio of the density” of ice to the density of water is equal to the ratio of total volume of ice inside water to the total volume of ice.

(A) Both A and R are individually true, but’ R is the correct explanation of A
(B) Both A and R are individually 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

Consider the following statements
1. If a body completely gains its original shape after removal of force, it is elastic body.
2. The property to restore the natural shape of a body is elasticity.
3. When a body partially reagains its original shake after removal of deforming force it is partially elastic.
Which one of the option is correct?

(A) 1 and 2
(B) 1 and 3
(C) 2 and 3
(D) Ail are correct

A wave undergoes reflection from a rigid boundary. One of its characteristic parameters that changes is

(A) frequency
(B) phase
(C) velocity
(D) wavelength

Surface tension depends on

(A) atmospheric pressure
(B) nature of the liquid
(C) temperature of the liquid
(D) All of the above

Elasticity in the material in due to
1. The change is effective radius of the molecules
2. The change in intermolecular distance and restoring forces starts acting on the molecules.
3. The deforming forces acting on it. Which option is true?

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

X-rays are used for the study of crystal structure because

(A) X-rays are completely absorbed by the crystal
(B) the wavelength of X-rays is of the same order of magnitude as the interatomic spacing in crystals
(C) the wavelength of X-rays is very small in comparison with the interatomic spacing in crystals
(D) the crystals are completely transparent to X-rays

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

(A) surface tension
(B) viscosity
(C) density
(D) vapour pressure

The breaking stress of a wire depends on

(A) Material of the wire
(B) Length of the wire
(C) Radius of the wire
(D) Shape of cross-section of the wire

An echo will be heard if the minimum distance between the source of sound and obstacle is

(A) 10 m
(B) 1 m
(C) 15 m
(D) 17 m

Two capillary tubes of different diameters are dipped in water. The rise of wafer is

(A) same in both tubes
(B) greater in the tube of smaller diameter
(C) greater in the tube of larger diameter
(D) None of the above

Consider the following statements
1. If a body completely gains its original shape after removal of forces, it is elastic body.
2. The property to restore the natural shape of a body is elasticity.
3. When a body partially regains its original shape after removal of deforming force it is partially elastic.
Which one of the options is/are correct?

(A) 1 and 2
(B) 1 and 3
(C) 2 and 3
(D) All are correct

Which of the following types of wave is used by computed tomography employed for visualization of the internal structure of human body?

(A) X-rays
(B) Sound waves
(C) Magnetic resonance
(D) Radioisotopes

With the rise of temperature, the surface tension of a liquid

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

Elasticity in the material is due to
1. The change in effective radius of the molecules.
2. The change in intermolecular distance and restoring forces starts acting on the molecules.
3. The deforming forces acting on it. Which option is true?

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

Consider the following statements
1. A flute of smaller length produces waves of lower frequency.
Sound travels in rocks in the form of longitudinal elastic waves only.
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