Free NCERT Solutions, Notes & MCQs for Class 9–12

STRUCTURE OF THE ATOM-True/False

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Q 01 / 25

An atom is electrically neutral because the number of protons equals the number of electrons.

✔ True ✘ False

Q 02 / 25

J.J. Thomson discovered the neutron.

✔ True ✘ False

Q 03 / 25

The nucleus of an atom contains protons and neutrons.

✔ True ✘ False

Q 04 / 25

Electrons are found in the nucleus of an atom.

✔ True ✘ False

Q 05 / 25

Rutherford's alpha particle experiment led to the discovery that most of the atom’s space is empty.

✔ True ✘ False

Q 06 / 25

Bohr’s atomic model says electrons revolve in fixed energy levels or orbits.

✔ True ✘ False

Q 07 / 25

The charge of a proton is equal in magnitude but opposite to the charge of an electron.

✔ True ✘ False

Q 08 / 25

Isotopes have the same number of protons but different number of neutrons.

✔ True ✘ False

Q 09 / 25

The mass number of an atom is the sum of its protons and electrons.

✔ True ✘ False

Q 10 / 25

Only hydrogen atoms have no neutrons.

✔ True ✘ False

Q 11 / 25

The value of atomic number (Z) can be same for two different elements.

✔ True ✘ False

Q 12 / 25

All canal rays are composed of neutrons.

✔ True ✘ False

Q 13 / 25

The electron was discovered by J.J. Thomson using cathode ray experiment.

✔ True ✘ False

Q 14 / 25

Electrons are negatively charged particles.

✔ True ✘ False

Q 15 / 25

In the modern atomic model, protons and neutrons are confined to the nucleus.

✔ True ✘ False

Q 16 / 25

The sum of protons and neutrons is called the atomic number.

✔ True ✘ False

Q 17 / 25

Lewis symbols represent atoms using their valence electrons.

✔ True ✘ False

Q 18 / 25

Valency refers to the combining capacity of an atom.

✔ True ✘ False

Q 19 / 25

Dalton believed atoms are indivisible.

✔ True ✘ False

Q 20 / 25

The first atomic model was given by Rutherford.

✔ True ✘ False

Q 21 / 25

An element with atomic number 8 has 8 protons and 8 electrons.

✔ True ✘ False

Q 22 / 25

The number of neutrons in atom can be found by subtracting atomic number from mass number.

✔ True ✘ False

Q 23 / 25

Isobars have the same atomic number but different mass numbers.

✔ True ✘ False

Q 24 / 25

Shells in an atom are represented as K, L, M, N.

✔ True ✘ False

Q 25 / 25

The central core of an atom is called nucleus.

✔ True ✘ False

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STRUCTURE OF THE ATOM-True/False

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