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Class 12 Physics: Ray Optics and Optical Instruments — Chapter Test 1

Class 12 • Physics • Ray Optics and Optical Instruments • Chapter Test

MediumFREE

15

Questions

20 min

Duration

15

Marks (1 each)

No

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
The refractive index of a medium is:
A
vc\frac{v}{c}
B
cv\frac{c}{v}
C
cvcv
D
c−vc - v
View Correct Answer & Step-by-Step Solution
Correct Option:(B)cv\frac{c}{v}

Detailed explanation is available inside the official test attempt review.

Question 2 of 15
Total internal reflection occurs when light travels from a:
A
rarer to denser medium
B
denser to rarer medium at an angle greater than the critical angle
C
denser to rarer medium at any angle
D
vacuum into glass
View Correct Answer & Step-by-Step Solution
Correct Option:(B)denser to rarer medium at an angle greater than the critical angle

Detailed explanation is available inside the official test attempt review.

Question 3 of 15
For a medium with refractive index 2\sqrt{2}, the critical angle is:
A
30°
B
45°
C
60°
D
90°
View Correct Answer & Step-by-Step Solution
Correct Option:(B)45°

Detailed explanation is available inside the official test attempt review.

Question 4 of 15
Optical fibres work on the principle of:
A
refraction only
B
total internal reflection
C
diffraction
D
polarisation
View Correct Answer & Step-by-Step Solution
Correct Option:(B)total internal reflection

Detailed explanation is available inside the official test attempt review.

Question 5 of 15
The lens maker's formula is:
A
1f=(n−1)(1R1−1R2)\frac{1}{f} = (n - 1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)
B
1f=(n+1)(1R1+1R2)\frac{1}{f} = (n + 1)\left(\frac{1}{R_1} + \frac{1}{R_2}\right)
C
f=(n−1)(R1−R2)f = (n - 1)(R_1 - R_2)
D
1f=1R1+1R2\frac{1}{f} = \frac{1}{R_1} + \frac{1}{R_2}
View Correct Answer & Step-by-Step Solution
Correct Option:(A)1f=(n−1)(1R1−1R2)\frac{1}{f} = (n - 1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)

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: Ray Optics and Optical Instruments — 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 "Ray Optics and Optical Instruments" 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.