Which among the following waves is used for communication by artificial satellites ...? Mcqs

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Which among the following waves is used for communication by artificial satellites ...?

(A) Micro waves
(B) Radio waves

(C) A. M.
(D) Infra-red waves

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Approximate age of sun is _________...?

(A) 4.4 billion years
(B) 4.5 billion years

(C) 4.6 billion years
(D) 4.7 billion years

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Which one of the following is the softest...?

(A) sodium
(B) iron

(C) aluminium
(D) lithium

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The human eye acts like a ______...?

(A) Camera
(B) Telescope

(C) Projector
(D) Microscope

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The direction of electric force and electric field intensity is ______...?

(A) Parallel to each other
(B) Perpendicular to each other

(C) Opposite to each other
(D) In any direction

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Which bone in human body is not directly attached to other bones...?

(A) Ulna
(B) Hyoid

(C) Tibia
(D) Cranium

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The fourth state of matter is...?

(A) Water
(B) Salts

(C) Vapours
(D) Plasma

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Dielectric constant of water is...?

(A) 60
(B) 70

(C) 80
(D) None of these

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If proton number is 19, electron configuration will be ______...?

(A) 2, 8, 9
(B) 2, 8, 8, 1

(C) 2, 8, 1
(D) 2, 8, 3

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speed of sound in dry air at 20 °C is___________...?

(A) 353 m/s
(B) 345 m/s

(C) 343 m/s
(D) none of them

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