CDS Physics and Science 3

Question 1

The unit of electrical resistance is named after which scientist?

Accepted Answer

Georg Ohm

Answer

The Ohm (Ω), the unit of electrical resistance, is named after German physicist Georg Simon Ohm.

Question 2

Which planet is known as the 'Red Planet'?

Accepted Answer

Mars

Answer

Mars is called the Red Planet because its surface is covered with iron oxide (rust), giving it a reddish appearance.

Question 3

What is the process by which plants make food using sunlight called?

Accepted Answer

Photosynthesis

Answer

Photosynthesis is the process by which plants convert sunlight, CO₂, and water into glucose and oxygen.

Question 4

Sonar technology uses which type of waves to detect underwater objects?

Accepted Answer

Sound waves

Answer

Sonar (Sound Navigation And Ranging) uses sound waves (ultrasonic) to detect and locate underwater objects.

Question 5

What is the atomic number of hydrogen?

Accepted Answer

1

Answer

Hydrogen has atomic number 1, meaning it has one proton in its nucleus; it is the simplest element.

CDS - Combined Defence Services