Primary cosmic rays are composed largely of very fast__________...? Mcqs

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Primary cosmic rays are composed largely of very fast__________...?

(A) Protons
(B) Neutrons

(C) Electrons
(D) Gamma rays

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Which layer of the atmosphere reflects radio waves back to the earth’s surface...?

(A) Troposphere
(B) Stratosphere

(C) Ozone layer
(D) Ionosphere

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Materials for rain-proof coats and tents owe their water proof properties to________...?

(A) Surface tension
(B) Viscosity

(C) Specific gravity
(D) Elasticity

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When the wire is disconnected and the bulb is off, this is called...?

(A) Open Circuit
(B) Close Circuit

(C) Short Circuit
(D) Series Circuit

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Air contains volume of carbon dioxide approximately...?

(A) 3%
(B) 33%

(C) 0.3%
(D) 0.03%

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The time in which Earth completes its revolution around the Sun is________...?

(A) 365.25 days
(B) 340 days

(C) 325 days
(D) 360 days

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Numerical value of ______ remains constant every where....?

(A) g
(B) G

(C) F
(D) W

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Which of the following are non-biodegradable materials ______...?

(A) Dead Animals
(B) Plastics

(C) Bread
(D) None of these

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Coke is made by heating coal in the absence of air at__________...?

(A) 700 °C
(B) 900 °C

(C) 1300 °C
(D) 1700 °C

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Which of the following use movable pulleys...?

(A) Water wells
(B) Flags

(C) Bicycles
(D) Cranes

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