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

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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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Friction can be reduced by changing from _________...?

(A) Rolling to sliding
(B) Sliding to rolling

(C) Dynamic to static
(D) Potential energy to kinetic energy

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Which of the following atmospheric layers help in radio communication...?

(A) Exosphere
(B) Ionosphere

(C) Troposphere
(D) Stratosphere

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The human eye forms the image of an object at its________...?

(A) Cornea
(B) Pupil

(C) Iris
(D) Retina

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The Mirror used in the Automobiles are___________...?

(A) Concave
(B) Convex

(C) Plains
(D) Reflective

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What is the most abundant form of matter in the universe...?

(A) Plasma
(B) Liquid

(C) Gas
(D) Solid

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When was the polio vaccine first launched in Pakistan...?

(A) 1961
(B) 1974

(C) 1988
(D) 1994

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How many elements are in modern periodic table...?

(A) 118
(B) 181

(C) 108
(D) 188

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Bryophytes are ____plants...?

(A) Genotype
(B) Non-vascular

(C) Alleles
(D) Chromosomes

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Remote sensing is the science of obtaining information about objects or areas on earth from space by using ____...?

(A) Satellite
(B) Radar

(C) Telescope
(D) Aircraft

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