Which statement is incorrect about chemical reactions...? Mcqs

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Which statement is incorrect about chemical reactions...?

(A) States of matter does not change during chemical reactions
(B) Chemical reactions produce new substances

(C) Chemical reactions occur with the absorption or emission of energy
(D) Chemical reactions may be fast, moderate or slow

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What causes mumps...?

(A) Fungus
(B) Bacterium

(C) Deficiency of vitamins
(D) Virus

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The gas used in a refrigerator to cool water is___________...?

(A) Nitrogen
(B) Carbon dioxide

(C) Methane
(D) Tetrafluoroethane

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Solar panels contain Solar Cell which are called ____...?

(A) Photo-voltaic cells
(B) photo - electric cells

(C) photo- septic cell
(D) None

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Which among the following is responsible for producing color of human skin ___...?

(A) Insulin
(B) Vitamin K

(C) Melanin
(D) DNA

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what are stars mainly made of ...?

(A) Balls of gass
(B) Rock

(C) Ice
(D) Light

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Which part of a D.C motor reverses the direction of current through the coil every half-cycle...?

(A) The armature
(B) The commutator

(C) The brushes
(D) The slip rings

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What is the frequency formula...?

(A) check in details
(B) empty

(C) empty
(D) empty

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A piece of matter in pure form is termed as ______...?

(A) Redical
(B) Mixture

(C) Compound
(D) Substance

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Trypsin is an enzyme which digests protein produced by_____________...?

(A) Liver
(B) Pancreas

(C) Stomach
(D) Small intestine

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