Which of the following is helpful for removal of permanent hardness...? Mcqs

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Which of the following is helpful for removal of permanent hardness...?

(A) Na2CO3
(B) Ca(OH)2

(C) CaCO2
(D) Na2SO4

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Which living thing would decrease, if the number of frogs increased...?

(A) Hawks
(B) Snakes

(C) Plants
(D) None

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Deficiency of vitamin E in the human body causes __________...?

(A) Muscle weakness and vision problem
(B) Bone problem

(C) Rickets
(D) Osteoporosis

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How many planets in Solor Syestem...?

(A) 4
(B) 5

(C) 6
(D) 8

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Comets are made mostly of ______________...?

(A) Ice and dust
(B) Dust and lights

(C) Ice, dust and lights
(D) All of the above

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The radiant energy having lowest energy is...?

(A) gamma rays
(B) UV rays

(C) visible light
(D) Radio waves

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An iron nail/steel rod can be magnetize by...?

(A) By passing an electric current around it
(B) By heating it on a high flame

(C) By hammering
(D) By keeping it with an iron rod

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Which of the following is true of bile salts...?

(A) They are enzymes
(B) They are manufactured by the pancreas

(C) They emulsify fats in the duodenum
(D) They increase the efficiency of pepsin action

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The variety of coal in which the deposit contains recognizable traces of the original plant material is____________...?

(A) bitumen
(B) anthracite

(C) lignite
(D) peat

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What is the degree of rotation of the earth each hour...?

(A) 1°
(B) 5°

(C) 7.5°
(D) 15°

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