Which of the following is the main characteristic of electromagnets that makes them useful in cranes and doorbells...? Mcqs

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Which of the following is the main characteristic of electromagnets that makes them useful in cranes and doorbells...?

(A) They are very strong
(B) They are permanent

(C) They can be switched on and off
(D) They are very heavy

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The part of an eye acting as a black point of camera is ______...?

(A) Sclera
(B) Retina

(C) Optic disc
(D) Choroid

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Leach has ________ number of brains....?

(A) Zero
(B) 32

(C) 36
(D) None of these

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Speed of sound in air is _______km/h...?

(A) 1347
(B) 243

(C) 1235
(D) 1495

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Our atmosphere comprises of __________ Nitrogen...?

(A) 38% Nitrogen
(B) 58% Nitrogen

(C) 78% Nitrogen
(D) None of these

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Twinkling of stars is caused by ...?

(A) Reflection of light
(B) Polarization of light

(C) refraction of light
(D) Interference of light

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Mycology is a study of_______...?

(A) Virus
(B) Bacteria

(C) Anti virus
(D) Fungi

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In the word GPS, letter G stands for ____...?

(A) Geographic
(B) General

(C) Global
(D) Geostationary

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Most important effect of the moon on earth is that it___________...?

(A) Causes weather change
(B) Causes earthquakes

(C) Causes solar and lunar eclipse
(D) Effects tides of the ocean

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Ionic crystals have ______...?

(A) High melting points
(B) Moderate melting points

(C) Low melting points
(D) None of above

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