RRB NTPC Science and Technology Basics

Question 1

Which instrument is used to measure atmospheric pressure?

Accepted Answer

Barometer

Answer

A Barometer is used to measure atmospheric (air) pressure. It was invented by Evangelista Torricelli in 1643.

Question 2

The chemical formula of common salt (table salt) is:

Accepted Answer

NaCl

Answer

Common table salt is Sodium Chloride (NaCl), formed by the ionic bond between sodium (Na) and chlorine (Cl) atoms.

Question 3

The speed of light in vacuum is approximately:

Accepted Answer

3 × 10⁸ m/s

Answer

The speed of light in vacuum (c) is approximately 3 × 10⁸ m/s (exactly 299,792,458 m/s). This is a fundamental constant of nature.

Question 4

Which vitamin is produced by the human body when exposed to sunlight?

Accepted Answer

Vitamin D

Answer

Vitamin D (also called the 'sunshine vitamin') is synthesized in the skin when exposed to UVB rays from sunlight through a process involving 7-dehydrocholesterol.

Question 5

Newton's First Law of Motion is also known as the Law of:

Accepted Answer

Inertia

Answer

Newton's First Law of Motion is called the Law of Inertia: an object at rest stays at rest, and an object in motion stays in motion unless acted upon by an external force.

RRB NTPC Practice Test

RRB NTPC Practice Test

RRB NTPC Science and Technology Basics