Why the needle of iron swims on water surface when it is kept gently ...? Mcqs

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Why the needle of iron swims on water surface when it is kept gently ...?

(A) It will remain under the water, when it will displace more water than its weight
(B) the density of needle is less than that of water

(C) due to surface tension
(D) due to its shape

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Ozone layer protects the Earth from __________ radiations from the Sun....?

(A) microwaves
(B) infrared

(C) X-rays
(D) ultraviolet

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Wind energy is the __________ energy....?

(A) Potential
(B) Transverse

(C) Kinetic
(D) Mechanical

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When light changes in direction when entering one transparent medium to another is known as...?

(A) Reflection
(B) Diffraction

(C) Refraction
(D) Absorption

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An astronaut sees the colour of the sky as: _________...?

(A) Blue
(B) White

(C) Red
(D) Black

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Which of these is NOT an example of a renewable energy source...?

(A) Wind energy
(B) solar

(C) Coal
(D) Hydroelectric power

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A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls _________...?

(A) behind him
(B) in front of him

(C) into his hand
(D) by his side

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In general, the most destructive earthquake waves are the __________ ...?

(A) P waves
(B) S waves

(C) Surface waves
(D) All of the above

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Which bird weighs less than a penny...?

(A) Goldcrest
(B) Weebill

(C) Hummingbird
(D) None of these

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Stomata present in leaves help the plant in ______...?

(A) Absorption
(B) Evaporation

(C) Chlorophyll
(D) Chromoplast

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