Microscope resolution improved by: MCQ with Answer and Explanation

Question
Microscope resolution improved by:
A. Oil immersion
B. Longer wavelength light
C. Lower magnification
D. Smaller numerical aperture
Answer: Option A
Solution (By JKExamLibrary)
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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Practice More Physics Questions

Question #1
A 100 W bulb is used for 10 hours. Energy consumed is
A. 10 kWh
B. 0.1 kWh
C. 100 kWh
D. 1 kWh
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Correct Answer: Option D

Explanation:
Energy = 0.1 kW × 10 h = 1 kWh.
This question belongs to: Science Physics
Question #2
A charged particle enters a magnetic field at 90° to the field. Its kinetic energy
A. Remains constant
B. Increases
C. Decreases
D. Becomes zero
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Correct Answer: Option A

Explanation:
Magnetic force does no work, speed constant, so KE constant. Path circular.
This question belongs to: Science Physics
Question #3
The work done by a conservative force acting on a particle moving around any closed path is:
A. Zero
B. Positive
C. Depends on the path taken
D. Negative
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Correct Answer: Option A

Explanation:
By definition, a force is conservative if the work done by it on an object moving between two points is completely independent of the path taken. A direct consequence of this is that the total work done by a conservative force (like gravity or electrostatic force) in moving an object around a closed loop (returning to the starting point) is exactly zero.
This question belongs to: Science Physics
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