Relaxation of heart muscles and allowing the chambers to fill with blood called...? Mcqs

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Relaxation of heart muscles and allowing the chambers to fill with blood called...?

(A) Diastole
(B) Systole

(C) Cardiac arrest
(D) Heart failure

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Pure limestone is called _______...?

(A) Aluminum Oxide
(B) Calcium Carbonate

(C) Calcium Sulphate
(D) None of these

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Each day human body breathe in __________ liters of air....?

(A) 5,000 to 10,000
(B) 10,000 to 15,000

(C) 15,000 to 20,000
(D) 20,000 to 25,000

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How many times the proton is heavier than an electron...?

(A) 1030
(B) 1205

(C) 1650
(D) 1836

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Speed of sound in water at 20 °C is___________...?

(A) 1450 m/s
(B) 1474 m/s

(C) 1498 m/s
(D) 1500+ m/s

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A tight-rope walker carries a long pole which he holds across his body. The purpose of this pole is to____________...?

(A) Prop him up if he falls
(B) Spread out his weight and reduce the pressure on the rope

(C) Add extra weight to keep the rope tightly stretched
(D) To keep the centre of gravity always vertically above the rope

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A part of maize seed that contains stored food is called...?

(A) Embryo
(B) Endosperm

(C) Seed coat
(D) Cotyledon

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Salt dissolution in water, actually represents solute and solvent combination of _____...?

(A) Solid liquid solution
(B) Solid solid solution

(C) Liquid liquid solution
(D) Gas liquid solution

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Which one of the following is a non-luminous object(s)...?

(A) Sun
(B) Stars

(C) Moon
(D) Fireflies

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Which of the following scientific instruments is used to measure the atmospheric pressure...?

(A) Odometer
(B) Barometer

(C) Seismograph
(D) Audiometer

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