set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

An astronaut in the orbit in a spacecraft feels weightlessness

a) because acceleration in the orbit is equal to acceleration of gravity outside

b) due to the face that space craft has no energy

c) due to the absence of gravity inside

d) their is no gravity outside

Question : 2

Purity of a metal can be determined with the help of

a) Archimedes principle

b) Boyle's law

c) Pascal's law

d) Conservation of mass principle

Question : 3

Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent

a) increases the viscosity of water and oil

b) increases the surface tension between water and oil

c) reduces drastically the surface tension between water and oil

d) decreases the viscosity in detergent mixed water

Question : 4

If the radius of the earth were to shrink by one percent, its mass remaining the same, the value of g on the earth’s surface would:

a) decrease by 0.5%

b) increase by 2%

c) increase by 0.5%

d) decrease by 2%

Question : 5

Consider the following statements:

1. The gravitational force exerted by the sun on the moon is greater than the gravitational force exerted by the earth on the moon.
2. A heavy body falls at a faster rate than a light body in vacuum.

a) Both 1 and 2

b) 2 only

c) 1 only

d) Neither 1 nor 2

Question : 6

For which one of the following is capillarity not the reason?

a) Spread a water drop on a cotton cloth

b) Rising of underground water

c) Blotting of ink

d) Rising of water from the roots of a plant to its foliage