TNPSC Group 4 Online Mock Test 2020-21 - 1

Question: 1

Which one of the following laws directly explains the law of conservation of mass?

(A) Avogadro’s law

(B) Dalton’s law

(C) Berzelius hypothesis

(D) Hund’s rule

Ans: A

Avogadro’s law

Question: 2

According to the modern periodic Law, the properties of elements are periodic functions of their

(A) Atomic number

(B) Atomic mass

(C) Number of neutrons

(D) Valency

Ans: A

Atomic number

Question: 3

Brass is an alloy of

(A) Nickel and copper

(B) Copper and Silver

(C) Zinc and Copper

(D) Nickel and Zinc

Ans: C

Zinc and Copper

Question: 4

From which one among the following water sources, the water is likely to be contaminated with fluoride?

(A) Rain water

(B) Pond water

(C) River water

(D) Groundwater

Ans: D

Groundwater

Question: 5

Actinides are the elements with atomic numbers from

(A) 36 to 43

(B) 89 to 103

(C) 97 to 114

(D) 101 to 115

Ans: B

89 to 103

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