Subatomic Particles : Class 9 Science MCQ Practice Questions & Answers (Urdu)

1.

Which of the following is true about the electron?

A

It has a positive charge

B

It is located in the nucleus

C

It has a mass equal to that of a proton

D

It is found in orbitals outside the nucleus

View Answer

Correct Answer: D — It is found in orbitals outside the nucleus

Explanation:

Electrons move in orbitals outside the nucleus and carry a negative charge.

2.

What is the mass of a neutron?

A

1 kg

B

9.1 × 10^-31 kg

C

1 amu

D

0 amu

View Answer

Correct Answer: C — 1 amu

Explanation:

A neutron has a mass approximately equal to 1 atomic mass unit (amu).

3.

What is the mass of an electron?

A

1 amu

B

1836 amu

C

1/1836 amu

D

0 amu

View Answer

Correct Answer: C — 1/1836 amu

Explanation:

The mass of an electron is about 1/1836 of the mass of a proton.

Subatomic Particles in Class 9 Science : Practice MCQ Questions & Answers with Explanations