General Science - Physics MCQs - Set 5

1)   Which of the following states of matter has the weakest Intermolecular forces?

a. Solids
b. Liquids
c. Gases
d. It is same in solids, liquids and gases
Answer  Explanation 

ANSWER: Gases

Explanation:
The three states of matter varies from each other due to the following factors. (1) The different magnitudes of the interatomic and intermolecular forces. (2) The extent of random thermal motion of atoms and molecules of a substance (which depends upon temperature). The Intermolecular force is strongest in solids and weakest in gases.

2)   What is the fourth state of matter called?

a. Solid
b. Liquid
c. Gas
d. Plasma
Answer  Explanation 

ANSWER: Plasma

Explanation:
The fourth state of matter is called as Plasma. In Plasma, the medium is in the form of positive and negative ions. Plasma occurs in the atmosphere of stars (including the sun) and in discharge tubes.

3)   Which of the following strains is produced in a body if the deforming force produces a change in the shape of the body without changing its volume?

a. Linear
b. Volumetric
c. Shearing
d. All of the above
Answer  Explanation 

ANSWER: Shearing

Explanation:
If the deforming force produces a change in the shape of the body without changing its volume, the strain produced in the body is called as shearing strain. Shearing strain is defined as angle in radians through which a plane perpendicular to the fixed surface of the cubical body gets turned under the effect of tangential force.

4)   What is the name given to the linear strain produced in the direction of deforming force?

a. Linear strain
b. Longitudinal strain
c. Directional strain
d. Zero strain
Answer  Explanation 

ANSWER: Longitudinal strain

Explanation:
Linear strain: If the deforming force produces a change in length alone, the strain produced in the body is called linear strain or tensile strain. Linear strain in the direction of deforming force is called longitudinal strain and in a direction perpendicular to force is called lateral strain.

5)   What is the force that is required to produce unit elongation in a wire known as?

a. Bulk modulus
b. Thermal strain
c. Thermal stress
d. Force constant
Answer  Explanation 

ANSWER: Force constant

Explanation:
Force constant of material of wire is the force required to produce unit elongation in a wire. It is denoted by k. K = F/l or K = YA/l

6)   What is the equilibrium distance for Hydrogen atoms?

a. 0.54 Å
b. 0.64 Å
c. 0.74 Å
d. 0.84 Å
Answer  Explanation 

ANSWER: 0.74 Å

Explanation:
When the interatomic force between two atoms is zero, the distance between them is called as normal or equilibrium distance. The equilibrium distance for Hydrogen atoms is 0.74 Å.

7)   Which of the following is the correct equivalent of 1 atmosphere?

a. 1 atmosphere = 1.013 × 10⁵Pa
b. 1 atmosphere = 1.013 × 10⁴Pa
c. 1 atmosphere = 1.013 × 10³Pa
d. 1 atmosphere = 1.013 × 10²Pa
Answer  Explanation 

ANSWER: 1 atmosphere = 1.013 × 10⁵Pa

Explanation:
A common unit of pressure is the atmosphere (atm), i.e. the pressure exerted by the atmosphere at sea level (1 atm = 1.013 × 10⁵Pa).

8)   What is the upward force experienced by a body, when it is immersed in a fluid, known as?

a. Tangential force
b. Buoyant force
c. Centrifugal force
d. Hydraulic force
Answer  Explanation 

ANSWER: Buoyant force

Explanation:
When a body is immersed in a fluid (liquid or gas) it exerts an upward force on that body. This upward force is called up thrust or buoyant force, The whole phenomenon is called as buoyancy.

9)   What happens to a body when its density is greater than the density of the fluid?

a. it floats
b. it sinks
c. it stays at rest
d. None of the above
Answer  Explanation 

ANSWER: it sinks

Explanation:
The body sinks in the fluid in case its density is greater than the density of the fluid. For example, an iron nail has greater density than water, therefore it sinks in water.

10)   Which of the following factors affect the Surface Tension?

a. Nature of liquid
b. Area of Surface
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Nature of liquid

Explanation:
The Surface tension depends only on the nature of liquid and is independent of the area of surface or length of line considered. Surface tension of a liquid is measured by the force acting per unit length on either side of an imaginary line drawn on the free surface of liquid.

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