Enzymes catalyze chemical reaction by _____ the activation energy....? Mcqs

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Enzymes catalyze chemical reaction by _____ the activation energy....?

(A) Raising
(B) Lowering

(C) Maintaining
(D) Ignoring

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Water covers __________ of the Earth’s surface...?

(A) 61%
(B) 67%

(C) 71%
(D) 76%

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A mature, large ovary and seed are _____...?

(A) Stem
(B) Leaf

(C) Flower
(D) Fruit

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Which of the following is the purpose of connecting a battery in an electric circuit...?

(A) To maintain resistance across the conductor
(B) To vary resistance across the conductors

(C) To maintain constant potential difference across the conductor
(D) To maintain varying potential difference across the conductor

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Intensity of gravitational field of earth is maximum at...?

(A) Poles
(B) Equator

(C) Center of earth
(D) Surface

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Ultrasound has several uses in medicine and industry. Which one has use of ultrasound...?

(A) Absorption
(B) Pre-natal scanning

(C) Dispersion
(D) Measuring humidity of air

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Which gas does a Photocopier machine produce...?

(A) Ozone
(B) carbon dioxide

(C) Sulfur dioxide
(D) None of these

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Which takes place when sex cells are divided and gametes are formed during the process of reproduction in humans...?

(A) Mitosis
(B) Respiration

(C) Meiosis
(D) Photosynthesis

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What does a cylinder measure...?

(A) Length and width
(B) Width and height

(C) Height and diameter
(D) Diameter and circumference

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Which Gas is included in Fry Chips Packets for safety...?

(A) Nitrogen gas
(B) Carbon dioxide

(C) Oxygen
(D) Hydrogen

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