Which one of the following is not a sign of chemical change...? Mcqs

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Which one of the following is not a sign of chemical change...?

(A) No change in composition
(B) A release of gas

(C) Change in colour, temperature, smell
(D) Production of a new material

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Dermatophagia is a ____ condition....?

(A) Physiological
(B) Psychological

(C) Dermatological
(D) Genital

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The top atmosphere of the Earth directly reflects back into space nearly what part of the total amount of sun’s energy coming to it...?

(A) 10%
(B) 20%

(C) 30%
(D) 50%

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A wheel with pointed edges like teeth are...?

(A) Pulley
(B) Gear

(C) Axle
(D) Sprocket

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All are sources of calcium except...?

(A) Red meat
(B) Green leafy vegetables

(C) Broccoli
(D) Nuts

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Which one among the following is an example of decomposition reaction...?

(A) The formation of hydrogen and oxygen from water
(B) The formation of water from hydrogen and oxygen

(C) The formation of carbon dioxide from carbon and oxygen
(D) The formation of oxygen from nitrogen and oxygen

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In the ball and bowl system, the mean position is at ______...?

(A) The earth
(B) Floor of the bowl

(C) Center of bowl
(D) Extreme position

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A force that stops things from moving easily is known as:...?

(A) Fraction
(B) Friction

(C) Fission
(D) Flocculation

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Sound travels in air at an average speed of nearly________ ...?

(A) 1257 miles per hour
(B) 755 miles per hour

(C) 330 miles per hour
(D) None of these

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Plant cell loses water and cytoplasm shrinks in a process called...?

(A) Osmosis
(B) Deplasmolysis

(C) Cytolysis
(D) Plasmolysis

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