Refractive Index of a Glass Slab using a Travelling Microscope NEET Questions

Physics - Experimental Skills

Refractive Index of a Glass Slab using a Travelling Microscope MCQ Questions


13.
If the shift due to a glass slab of thickness 6 cm with n = 1.5 is:
A.
6 cm
B.
1 cm
C.
shift = 6 × (1 - 1/1.5) = 6 × 0.333 = 2 cm
D.
3 cm
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ANSWER :
C. shift = 6 × (1 - 1/1.5) = 6 × 0.333 = 2 cm
14.
Why does an object appear shallower under water?
A.
Water magnifies
B.
By chance
C.
Optical illusion only
D.
Refraction at water surface bends rays; brain perceives object position along straight-line extrapolation
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ANSWER :
D. Refraction at water surface bends rays; brain perceives object position along straight-line extrapolation
15.
A travelling microscope is:
A.
A microscope mounted on a vertical scale that allows precise vertical (or horizontal) movement; used to measure small distances
B.
A movable telescope
C.
A spectrometer
D.
A regular microscope
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ANSWER :
A. A microscope mounted on a vertical scale that allows precise vertical (or horizontal) movement; used to measure small distances
16.
The travelling microscope has:
A.
No scales
B.
Main scale (typically in mm or cm) and vernier scale for fine reading
C.
Only a screw
D.
Just a magnifying lens
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ANSWER :
B. Main scale (typically in mm or cm) and vernier scale for fine reading
17.
The least count (LC) of a travelling microscope is typically:
A.
1 cm
B.
1 m
C.
1 mm
D.
0.001 cm (or 0.01 mm = 10 Ξm)
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ANSWER :
D. 0.001 cm (or 0.01 mm = 10 Ξm)
18.
Least count of vernier scale is:
A.
Just 1 mm
B.
Number of divisions
C.
LC = (Smallest main scale division) / (Number of vernier scale divisions)
D.
Random
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ANSWER :
C. LC = (Smallest main scale division) / (Number of vernier scale divisions)