RRB NTPC Science and Technology Basics 2

Question 1

Which of the following is an example of a chemical change?

Accepted Answer

Burning of wood

Answer

Burning of wood is a chemical change (combustion) because new substances (CO₂, water vapor, ash) are formed and the change is irreversible.

Question 2

The unit of electrical resistance is:

Accepted Answer

Ohm

Answer

The SI unit of electrical resistance is the Ohm (symbol: Ω), named after German physicist Georg Simon Ohm who formulated Ohm's Law.

Question 3

Which planet has the most moons in our solar system?

Accepted Answer

Saturn

Answer

Saturn has the most confirmed moons in our solar system, with 146 confirmed moons as of 2023, surpassing Jupiter's 95 moons.

Question 4

The process by which plants make food using sunlight is called:

Accepted Answer

Photosynthesis

Answer

Photosynthesis is the process by which green plants, algae, and some bacteria use sunlight, water, and CO₂ to produce glucose and oxygen.

Question 5

Which type of mirror is used in the headlights of vehicles?

Accepted Answer

Concave mirror

Answer

Concave (converging) mirrors are used in vehicle headlights. The light source is placed at the focal point, and the reflected beam comes out as a parallel, focused beam of light.

RRB NTPC Practice Test

RRB NTPC Practice Test

RRB NTPC Science and Technology Basics 2