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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Dead cells of xylem vessels arranged vertically have empty space inside called...?

(A) Cell wall
(B) Lumen

(C) Cytoplasm
(D) Chlorophyll

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The most abundant element in sea water is...?

(A) Chlorine
(B) Sodium

(C) Sulfur
(D) Magnesium

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By which process does the smell of cooking spread to all the rooms in a house...?

(A) Distillation
(B) Diffusion

(C) Decomposition
(D) Displacement

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In BTU system, one BTU is equal to__________...?

(A) 2055 Joule
(B) 1155 Joule

(C) 2155 Joule
(D) 1055 Joule

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Blood is cleaned by __________...?

(A) Lungs
(B) Liver

(C) Heart
(D) Kidneys

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Which formula helps in the determination of the maximum number of electrons present in an orbit...?

(A) 2n^2
(B) 2n

(C) n^2
(D) n/2

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Marasmus disease is caused due to serve deficiency of...?

(A) Vitamins
(B) Proteins

(C) Carbohydrates
(D) None

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The harvesting is most important step of ______...?

(A) Preparation of soap
(B) Preparation of cold drinks

(C) Preparation of sugar
(D) Preparation of medicines

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Which present in the yogurt start changing the milk into yogurt...?

(A) Bacteria
(B) Fungi

(C) Algae
(D) None

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