Sun revolves around milky way in about _____ million years....? Mcqs

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Sun revolves around milky way in about _____ million years....?

(A) 225
(B) 230

(C) 245
(D) 250

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In the structure of fiber, the light is guided through the core due to total internal:...?

(A) Reflection
(B) Refraction

(C) Diffraction
(D) None of these

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Escape velocity of a rocket fired from the earth towards the moon is a velocity to get rid of the _______...?

(A) Centripetal force due to the earth’s rotation
(B) Earth’s gravitational pull

(C) Pressure of the atmosphere
(D) Moon’s gravitational pull

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The distance between the optical centre of a convex lens and its principal focus is called its_______...?

(A) Focal Length
(B) Radius of Curvature

(C) Power
(D) Magnification

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Which type of wastes are classified as Biodegradable waste...?

(A) Waste from plastic industries
(B) Vegetables waste from farms

(C) Wasted water from homes
(D) None

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Which part of a D.C motor reverses the direction of current through the coil every half-cycle...?

(A) The armature
(B) The commutator

(C) The brushes
(D) The slip rings

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Binocular work on the principle of which one of the following...?

(A) Refraction of Light
(B) Diffraction of Light

(C) Total Internal Reflection of Light
(D) Transmission of Sound

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The atmospheric air is held to the Earth by...?

(A) gravity
(B) winds

(C) clouds
(D) rotation of the Earth

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Science of diagnosis and treatment of diseases ____...?

(A) Agriculture
(B) Medicine

(C) Surgery
(D) Both B and C

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Which one of the following is not a sign of physical change...?

(A) Change that can be reversed
(B) The substance does not turn into a new substance

(C) A release of gas
(D) None

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