NEET UG Optics – Topic Test
NEET UG Optics – Topic Test is an online topic test in the NEET UG pattern, covering Optics. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.
Topics in this test
| Topic | Questions |
|---|---|
| Optics | 30 |
Difficulty: 15 medium · 15 hard
Optics MCQ questions with answers
The first 3 of 30 questions. Unlock the series for the rest, each with a solution.
Q1. Plane-polarised light of intensity I₀ is incident on an analyser whose transmission axis makes an angle of 30° with the plane of polarisation of the light. The intensity of the transmitted light is:
I₀ तीव्रता का समतल-ध्रुवित प्रकाश एक विश्लेषक पर आपतित होता है जिसका संचरण अक्ष प्रकाश के ध्रुवण तल से 30° का कोण बनाता है। संचरित प्रकाश की तीव्रता है:
- A. I₀/√2
- B. I₀/2
- C. I₀/4
- D. 3I₀/4
Solution
By Malus's law, I = I₀cos²θ = I₀cos²30° = I₀ × (3/4) = 3I₀/4.
मैलस के नियम से, I = I₀cos²θ = I₀cos²30° = I₀ × (3/4) = 3I₀/4।
Q2. An astronomical telescope has an objective of focal length 100 cm and an eyepiece of focal length 2 cm. In normal adjustment its magnifying power is:
एक खगोलीय दूरदर्शी में 100 cm फोकस दूरी का अभिदृश्यक (ऑब्जेक्टिव) और 2 cm फोकस दूरी का नेत्रिका (आईपीस) है। सामान्य समायोजन में इसकी आवर्धन क्षमता है:
- A. 200
- B. 102
- C. 50
- D. 25
Solution
In normal adjustment M = fo/fe = 100/2 = 50. The value 102 cm is the tube length (fo + fe), not the magnifying power.
सामान्य समायोजन में M = fo/fe = 100/2 = 50। मान 102 cm नली की लंबाई (fo + fe) है, आवर्धन क्षमता नहीं।
Q3. Consider the following. Assertion (A): The critical angle for diamond is smaller than that for ordinary glass. Reason (R): The refractive index of diamond is greater than that of glass. Choose the correct option.
निम्नलिखित पर विचार करें। अभिकथन (A): हीरे के लिए क्रांतिक कोण साधारण काँच की तुलना में छोटा होता है। कारण (R): हीरे का अपवर्तनांक काँच की तुलना में अधिक होता है। सही विकल्प चुनें।
- A. Both A and R are true but R is not the correct explanation of A / A और R दोनों सही हैं परन्तु R, A की सही व्याख्या नहीं है
- B. A is true but R is false / A सही है परन्तु R गलत है
- C. Both A and R are true and R is the correct explanation of A / A और R दोनों सही हैं तथा R, A की सही व्याख्या है
- D. A is false but R is true / A गलत है परन्तु R सही है
Solution
Since sin θc = 1/μ, a larger refractive index gives a smaller critical angle; diamond (μ ≈ 2.42) has a higher index than glass (μ ≈ 1.5), so A and R are both true and R correctly explains A.
चूँकि sin θc = 1/μ, अधिक अपवर्तनांक से छोटा क्रांतिक कोण मिलता है; हीरे (μ ≈ 2.42) का अपवर्तनांक काँच (μ ≈ 1.5) की तुलना में अधिक है, अतः A और R दोनों सही हैं तथा R, A की सही व्याख्या करता है।
Frequently asked questions
How many questions are in the NEET UG Optics – Topic Test?
30 questions for 30 marks, to be answered in 30 minutes.
Is there negative marking in the NEET UG Optics – Topic Test?
Yes — 0.25 marks are deducted for each wrong answer, as in the real exam pattern.
Which topics does the NEET UG Optics – Topic Test cover?
Optics (30 questions).
Is the NEET UG Optics – Topic Test free?
It is part of the NEET UG 2027 Mock Test Series (134 tests, ₹299). You can first try Biology in Human Welfare – Topic Test for free.
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