Microscope resolution improved by: MCQ with Answer and Explanation

Question
Microscope resolution improved by:
A. Oil immersion
B. Longer wavelength light
C. Smaller numerical aperture
D. Lower magnification
Answer: Option A
Solution (By JKSSB Mock Tests)
Oil immersion increases numerical aperture (NA) by matching refractive indices, improving resolution d = λ/(2NA). Memory tip: 'Higher NA or shorter λ ⇒ better resolution'. Optical instrument concept frequently tested in competitive exams.
This question belongs to: Science Physics
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Question #1
A typical LED converts electrical energy into light with efficiency around
A. 80-90%
B. 10%
C. 50-60%
D. 100%
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Correct Answer: Option A

Explanation:
LEDs are highly efficient, converting ~80-90% of electrical energy into light, rest heat. Incandescent bulbs ~10% efficient. LED long life, low power. Blue LED Nobel prize 2014.
This question belongs to: Science Physics
Question #2
A stone is dropped from a height of 80 m. Time to reach ground (g=10) is
A. 8 s
B. 4 s
C. 16 s
D. 2 s
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Correct Answer: Option B

Explanation:
h = ½gt² => 80 = 5t² => t²=16 => t=4 s.
This question belongs to: Science Physics
Question #3
The device which converts mechanical energy into electrical energy is
A. Generator
B. Transformer
C. Motor
D. Rectifier
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Correct Answer: Option A

Explanation:
Generator uses electromagnetic induction to produce electricity from mechanical motion.
This question belongs to: Science Physics
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