The S. I. unit of refractive index is _______...? Mcqs

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The S. I. unit of refractive index is _______...?

(A) meter
(B) cm

(C) watt
(D) no unit

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The Velocity of light in a diamond is (whereas the refractive index of a diamond with respect to vacuum is 2.5)...?

(A) 5x10^8m/s
(B) 2.5x10^8m/s

(C) 1.2x10^10m/s
(D) 1.2x10^8m/s

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Sound travels fastest in _______...?

(A) Air
(B) Water

(C) Diamond
(D) Steel

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Each day human body breathe in __________ liters of air....?

(A) 5,000 to 10,000
(B) 10,000 to 15,000

(C) 15,000 to 20,000
(D) 20,000 to 25,000

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Potassium nitrate is used in__________...?

(A) Medicine
(B) Fertilizer

(C) Salt
(D) Glass

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The SI unit of “pressure” is _________....?

(A) pascal
(B) joule

(C) tesla
(D) henry

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When the angle of refraction is 90° and the refractive index for water is 1. 33, the critical angle is ______...?

(A) 48.8°
(B) 50.0°

(C) 49.1°
(D) 51.0°

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The distance between Earth and Sun is greatest during ____________...?

(A) Apehelion
(B) Astronomical

(C) Lopsided
(D) Astronomi

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