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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Water waves pass from deep into the shallow region and are then refracted. The characteristics of waves which will remain constant is _____...?

(A) Direction
(B) Frequency

(C) Speed
(D) Wavelength

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Number of electrons lost by atoms of group IIIA equals ______...?

(A) 1
(B) 2

(C) 3
(D) 4

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Animals that eat only plants are known as...?

(A) Carnivores
(B) Omnivores

(C) Herbivores
(D) None of these

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Sleeping sickness in the natives of Africa is caused by________...?

(A) Trichomonas
(B) Giardia

(C) Leishmania
(D) Trypanosoma

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Animal with the sharpest hearing ability...?

(A) Rat
(B) Greater wax moth

(C) Bat
(D) Squirrel

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A form of energy which flows from a region of high temperature to a region of low temperature is known as...?

(A) Heat
(B) Light

(C) Sound
(D) Work

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Fat provides _______ as much energy as the same amount of carbohydrate....?

(A) Half
(B) Twice

(C) Same
(D) One-quarter

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The instrument used to measure wind speed is...?

(A) Anemometer
(B) Barometer

(C) Hydrometer
(D) Hygrometer

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The activity in relation to changes in environment is ______...?

(A) Stimulus
(B) Response

(C) Both a & b
(D) None of these

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