RRB NTPC General Science 3

Question 1

Which force keeps planets in orbit around the Sun?

Accepted Answer

Gravitational force

Answer

Gravity is the force that keeps planets in orbit by constantly pulling them toward the Sun.

Question 2

The pH value of pure water is:

Accepted Answer

7

Answer

Pure water is neutral with a pH of exactly 7 at 25°C.

Question 3

Which blood group is called the universal donor?

Accepted Answer

O-

Answer

O negative (O−) blood can be given to anyone regardless of blood type, making it the universal donor.

Question 4

The process by which a solid directly converts to gas is called:

Accepted Answer

Sublimation

Answer

Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.

Question 5

Which part of the eye controls the amount of light entering it?

Accepted Answer

Iris

Answer

The iris controls the size of the pupil, thereby regulating the amount of light entering the eye.

RRB NTPC Practice Test