Class 12 Physics: Atoms — Chapter Test 1

Class 12 • Physics • Atoms • Chapter Test

MediumFREE

Questions

20 min

Duration

Marks (1 each)

Negative marking

Original practice questions with full solutions by ExamPortal.

Instructions

• Read each question carefully and pick the correct answer.
• You can mark questions for review and come back to them.
• Answers are saved automatically.
• The test is submitted automatically when time runs out.

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SYLLABUS & QUESTION BLUEPRINT

Sample Practice Questions

Preview 5 sample questions from this 15-question test. Test your knowledge below or take the full exam in timed CBT mode.

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Question 1 of 15

Rutherford's alpha-particle scattering experiment showed that:

the atom is uniformly positive

most of the atom's mass and positive charge is in a tiny nucleus

electrons are in the nucleus

atoms are indivisible

View Correct Answer & Step-by-Step Solution

Correct Option:(B)most of the atom's mass and positive charge is in a tiny nucleus

Detailed explanation is available inside the official test attempt review.

Question 2 of 15

In Bohr's model, the angular momentum of an electron is quantised as:

mvr = nh

mvr = \frac{nh}{2\pi}

mvr = \frac{h}{n}

mvr = 2\pi nh

View Correct Answer & Step-by-Step Solution

Correct Option:(B)

mvr = \frac{nh}{2\pi}

Detailed explanation is available inside the official test attempt review.

Question 3 of 15

The energy of an electron in the

n

th orbit of hydrogen is:

-\frac{13.6}{n^2}

-13.6n^2

\frac{13.6}{n}

-\frac{13.6}{n}

View Correct Answer & Step-by-Step Solution

Correct Option:(A)

-\frac{13.6}{n^2}

Detailed explanation is available inside the official test attempt review.

Question 4 of 15

The ionisation energy of a hydrogen atom in its ground state is:

3.4 eV

10.2 eV

13.6 eV

1.51 eV

View Correct Answer & Step-by-Step Solution

Correct Option:(C)13.6 eV

Detailed explanation is available inside the official test attempt review.

Question 5 of 15

The radius of the

n

th Bohr orbit is proportional to:

n

n^2

\frac{1}{n}

\frac{1}{n^2}

View Correct Answer & Step-by-Step Solution

Correct Option:(B)

n^2

Detailed explanation is available inside the official test attempt review.

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Frequently asked questions

How many questions are there in Class 12 Physics: Atoms — Chapter Test 1?

There are 15 questions to answer in 20 min. Each correct answer gives 1 mark, for a total of 15 marks.

Is there negative marking?

No. Wrong answers do not lose marks, so attempt every question.

Is this mock test free?

Yes, it is completely free. Just log in with your email to start.

What does this test cover?

It covers the chapter "Atoms" of Class 12 Physics. All questions are original, with a full solution for each.

Will I see my result and the solutions?

Yes. Right after you submit you get your score, accuracy, rank and percentile, and you can review every question with the correct answer and a step-by-step explanation.

Can I take this test again?

Yes, you can retake it as many times as you like and compare your scores.