1)

Protium, deuterium and tritium are the naturally occurring isotopes of :

SSC CGL 2020

A)

Hydrogen

B)

Nitrogen

C)

Carbon

D)

Gold

2)

In which of the following is citric acid present ?

 

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A)

Black Gram

B)

Curd

C)

Lemon

D)

Tamarind

3)

Constantan is an alloy of copper and _______.

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A)

Iron

B)

Nickel

C)

Aluminium

D)

Tin

4)

Which of the following is an inert gas most commonly found in light bulbs?

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A)

Oxygen

B)

Hydrogen

C)

Radon

D)

Argon

5)

Name the densest stable element known on earth.

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A)

Rhodium

B)

Osmium

C)

Aluminium

D)

Tungsten

6)

How many carbon and hydrogen atoms are there in Propane, respectively?

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A)

2, 6

B)

2, 4

C)

4, 7

D)

3, 8

7)

What is the bond angle (in degrees) in the structure of a benzene molecule?

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A)

120

B)

90

C)

150

D)

60

8)

Which one of the following statements is INCORRECT?

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A)

The measurable unit of pressure is denoted in Metre.

B)

Matter is made up of small particles.

C)

Evaporation causes cooling.

D)

Brass is a mixture of 30% zinc and 70% copper.

9)

Which of the following is used for removing permanent hardness of water?

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A)

Baking soda

B)

Lime

C)

Bleaching powder

D)

Washing soda

10)

Which of the following has the lowest melting point?

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A)

Lead

B)

Zinc

C)

Silver

D)

Tin