Natural Radioactivity was discovered by Becquerel in ____________...? Mcqs

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Natural Radioactivity was discovered by Becquerel in ____________...?

(A) 1766
(B) 1896

(C) 1935
(D) 2001

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A normal platelets count range ...?

(A) 1.5 lac  – 4.5 lac platelets per liter blood.
(B) 1.5 lac – 4.5 lac platelets per micro-liter of blood.

(C) 1.5 million  – 4.5 million platelets per liter of blood.
(D) 1.5 million  – 4.5 million platelets per micro-liter of blood.

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NH3 can be a base according to ______...?

(A) Arrhenius theory
(B) Bronsted-Lowery theory

(C) Lewis theory
(D) Both b and c

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Total mass of the reactants and products will remain conserved during a chemical reaction, this statement is called _____...?

(A) Law of definite proportions
(B) Law of conservation of mass

(C) Law of multiple proportions
(D) Law of reciprocal proportions

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Percentage of water in a tomato is__________...?

(A) 94%
(B) 90%

(C) 47%
(D) None of these

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Why does cytosine not form a bond with adenine...?

(A) Cytosine is unable to form hydrogen bonds with adenine.
(B) Adenine and cytosine have incompatible hydrogen bond donors and acceptors.

(C) Cytosine only pairs with thymine due to their complementary structures.
(D) Adenine is a pyrimidine and cannot bond with cytosine.

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If the ratio of solute to solvent is high, the solution is said to be ______...?

(A) Aqueous Solution
(B) Unsaturated Solution

(C) Concentrated Solution
(D) Saturated Solution

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Which gas is produced when trees and fossil fuels are burnt...?

(A) Carbon monoxide
(B) Carbon dioxide

(C) Nitrogen oxide
(D) Oxygen

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The process of vaporizing a solid substance and condensing the vapours to form the solid directly is known as...?

(A) Distillation
(B) Sublimation

(C) Filtration
(D) Crystallization

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The materials required for photosynthesis are _______...?

(A) Water (H2O) and Oxygen (O2)
(B) Water (H2O) and Carbon Dioxide (CO2)

(C) Carbon Dioxide (CO2) and Light Energy
(D) Glucose (C6H12O6) and Oxygen (O2)

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