Class 12 Physics Chapter 12 Atoms MCQs

Access the latest Class 12 Physics MCQs for Chapter 12, along with their answers. The MCQ Questions with answers for Class 12 Physics are created as per the latest exam pattern. These questions will help students improve their critical thinking abilities and help them score good marks in board exams.

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Class 12 Atoms MCQs

Check the multiple-choice questions for the 12th Class Physics Atoms Chapter. Each MCQ will have four options here, out of which only one is correct. Students have to pick the correct option and check the answer provided here.

1. What did Rutherford’s alpha particle experiment prove?

1. Electrons
2. Protons
3. Neutrons
4. Nucleus

Answer: (d) Nucleus

Explanation: Rutherford’s alpha particle experiment proved the existence of the nucleus.

2. Why was Rutherford’s atomic model unstable?

1. Electrons do not remain in orbit.
2. Nuclei will break down.
3. The nucleus repels electrons.
4. Orbiting electrons radiate energy.

Answer: (a) Electrons do not remain in orbit.

Explanation: Rutherford’s atomic model was unstable because electrons do not remain in orbit.

3. Balmer series lies in which spectrum?

1. Ultraviolet
2. Visible
3. Infrared
4. Partially Visible

Answer: (b) Visible

Explanation: Balmer series lies in the visible spectrum.

4. According to the classical theory, the circular path of the electrons is

1. Circular
2. Parabolic
3. Spiral
4. Straight line

Answer: (c) Spiral

Explanation: According to classical theory, the circular path of the electrons is spiral.

5. Electrons in the atom are held to the nucleus by

1. Nuclear Force
2. Coulomb’s Force
3. Gravitational Force
4. Van Der Waal’s Force

Answer: (b) Columb’s Force

Explanation: Electrons in the atom are held to the nucleus by Coulomb’s Force.

6. The electrons of Rutherford’s model would be expected to lose energy because

1. They jump on the nucleus
2. They move randomly
3. Radiate electromagnetic waves
4. Escape from the atom

Answer: (c) Radiate electromagnetic waves.

Explanation: The electrons of Rutherford’s model would be expected to lose energy because they radiate electromagnetic waves.

7. Who discovered the first spectral series?

1. Lyman
2. Balmer
3. Paschen
4. Pfund

Answer: (b) Balmer

Explanation: Balmer discovered the first spectral series.

8. Which of the following did Bohr use to explain his theory?

1. Quantization of angular momentum
2. Conservation of Quantum frequency
3. Conservation of Mass
4. Conservation of Linear Momentum

Answer: (a) Quantization of angular momentum

Explanation: Bohr used the quantization of angular momentum to explain his theory.

9. The significant result deduced from Rutherford’s scattering experiment is that

1. the whole of the positive charge is concentrated at the centre of an atom
2. there are neutrons inside the nucleus
3. α-particles are hydrogen nuclei
4. electrons are embedded in the atom

Answer: (a) the whole of the positive charge is concentrated at the centre of an atom.

Explanation: The significant result deduced from Rutherford’s scattering is that whole of the positive charge is concentrated at the centre of the atom i.e. nucleus.

10. The first model of the atom was proposed by

1. Neils Bohr
2. Albert Einstein
3. J.J Thompson
4. Ernest Rutherford

Answer: (c) J.J Thompson

Explanation: J. J Thompson proposed the first model of the atom.

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