#### Atomic Structure English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

9th Standard

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Science

Time : 00:10:00 Hrs
Total Marks : 10

Part A

10 x 1 = 10
1. The term nucleons refer to

(a)

Protons and electrons

(b)

only Neutrons

(c)

electrons and neutrons

(d)

Protons and neutrons

2. The correct electronic configuration of potassium is

(a)

2,8,9

(b)

2,8,1

(c)

2,8,8,1

(d)

2,8,8,3

3. Law of multiple proportions was proposed by _________

(a)

J. Ritcher

(b)

Rutherford

(c)

John Dalton

(d)

J.J Thomson

4. The compounds N20, N02, N204, N205 explains___________ law.

(a)

Law of definite proportion

(b)

Law of multiple proportion

(c)

Law of reciprocal proportion

(d)

Law of conservation of mass

5. Most of the fast moving $\alpha$  particles passed straight through the gold foil explains __________

(a)

An atom has nucleus

(b)

There is a large empty space around the nucleus.

(c)

Electrons move in circular paths

(d)

Nucleus is in the centre

6. Maximum number of electrons that can be accommodated in an energy level is given by the formula ___________

(a)

n2

(b)

2n2

(c)

3n2

(d)

2n3

7. Protons and neutrons are collectively called as ________

(a)

mesons

(b)

neutrino

(c)

Nucleons

(d)

Positrons

8. The outermost shell of an atom is called its________ shell.

(a)

inner

(b)

outer

(c)

valence

(d)

sub shell

9. Elements which have valence electrons 1 or 2 or 3 are ____________

(a)

metal

(b)

non-metal

(c)

rare metal

(d)

valuable metal

(a)

Potassium 40

(b)

Iodine 131

(c)

Cobalt 60

(d)

Carbon 14