Some fruits like mango, lemon, raw grapes, oranges, etc have a sour taste to the presence of _____...? Mcqs

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Some fruits like mango, lemon, raw grapes, oranges, etc have a sour taste to the presence of _____...?

(A) Tartaric acid
(B) Malic acid

(C) Oxalic acid
(D) Citric acid

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What is unit of conductivity...?

(A) Ohm
(B) Watt

(C) mho
(D) None of these

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____, days become shorter and nights become longer....?

(A) Summer
(B) Spring

(C) Autumn
(D) Winter

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Which gas is used to extract energy from food in respiration...?

(A) CO2
(B) N2

(C) O2
(D) H2

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The term ‘Geography’ was coined first time by a Greek scholar _________ in 234BC...?

(A) Herodotus
(B) Thales of Miletus

(C) Eratosthenes
(D) Plato

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An average human heart beats about time in a minute...?

(A) 72 times
(B) 85 times

(C) 90 times
(D) 120 times

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Sound is a form of _____...?

(A) Electrical energy
(B) Thermal energy

(C) Mechanical energy
(D) Chemical energy

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Monsoon is caused by____________________...?

(A) Seasonal reversal of winds
(B) Revolution of earth

(C) Movement of clouds
(D) Rise in temperature

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What happens when you put sand, salt and sawdust in glass of water...?

(A) Salt has dissolved in water
(B) Sand sank to the bottom

(C) Sawdust floated on the top
(D) All of these

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Enzyme changes in pH can cause enzymes to ______...?

(A) Denature
(B) Activate

(C) Inhibit
(D) Stabilize

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