# NCERT Class 9/Class 9 Science Chapter 4 Structure of the Atom Sample Test,Sample questions

## Question: `An alpha particle is also known as:`

1.subatomic particle

2.an unionised helium atom

3.a neutral particle

4.a doubly-charged helium ion

1.3

2.7

3.1

4.4

## Question: ```Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order (i) Rutherfordâ€™s atomic model (ii) Thomsonâ€™s atomic model (ii) Bohrâ€™s atomic model```

1.(i), (ii) and (iii)

2.(ii), (iii) and (i)

3.(ii), (i) and (iii)

4.(iii), (ii) and (i)

1.5

2.8

3.12

4.18

1.protons

2.electrons

3.neutrons

4.nucleons

## Question: `Rutherfordâ€™s â€˜alpha (Î±) particles scattering experimentâ€™ resulted in the discovery of`

1.electron

2.proton

3.nucleus in the atom

4.atomic mass

## Question: `The charge on an electron is equal to:`

1.1.6 Ã— 10-19 C of -ve charge

2.2.6 Ã— 10-19 C of -ve charge

3.1.6 Ã— 10-22 C of -ve charge

4.1.6 Ã— 10-23 C of -ve charge

1.N. Bohr

2.E. Goldstein

3.Rutherford

4. J.J. Thomson

1.13

2.10

3.14

4.16

## Question: ```Which of the following are true for an element? (i) Atomic number = number of protons + number of electrons (ii) Mass number = number of protons + number of neutrons (iii) Atomic mass = number of protons = number of neutrons (iv) Atomic number = number of protons = number of electrons```

1.(i) and (ii)

2. (i) and (iii)

3. (ii) and (iii)

4.(ii) and (iv)

1.3, 8, 1

2.2, 8, 2

3.1, 8, 3

4.8, 2, 2

1.P-32

2. I-131

3. Co-60

4.any of these

## Question: `Which of the following statement is always correct?`

1.An atom has equal number of electrons and protons.

2. An atom has equal number of electrons and neutrons.

3.An atom has equal number of protons and neutrons.

4.An atom has equal number of electrons, protons and neutrons.

1. (i) and (iii)

2.(ii) and (iii)

3.(i) and (iv)

4. only (i)

## More MCQS

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