61)

In the Millikan’s Oil Drop experiment, the oil drop is subjected to such forces whose nature does NOT fall under the category of:

SSC CPO 2020

A)

electrostatic

B)

gravitational

C)

viscous

D)

magnetostatic

62)

If the size of the nucleus of an atom is compared with a cricket ball, then the radius of the atom is approximately equal to how many kilometres?

SSC CPO 2020

A)

0.5

B)

0.005

C)

5

D)

0.05

63)

What is the Atomic Number of the element Einsteinium?

SSC CPO 2020

A)

98

B)

101

C)

100

D)

99

64)

Iron nails become ______ after being dipped in copper sulphate solution.

SSC CPO 2020

A)

greenish

B)

brownish

C)

greyish

D)

bluish

65)

Saltpetre is another name for ______.

SSC CPO 2020

A)

potassium chloride

B)

sodium chloride

C)

potassium nitrate

D)

sodium hydroxide

66)

Which of the following is NOT a fossil fuel ?

SSC CPO 2020

A)

Bitumen

B)

Biomass

C)

Petroleum

D)

Asphalt

67)

What is the chemical symbol of Arsenic ?

SSC CPO 2020

A)

Ar

B)

As

C)

An

D)

Ac

68)

Which among the following is NOT true about a solution and the solute concerned?

SSC CPO 2020

A)

The particles of the solute settle down at the bottom when the solution is kept undisturbed.

B)

The particles of the solute do not scatter a beam of light.

C)

The particles of the solute cannot be seen with unaided eyes.

D)

A solution is a homogeneous mixture.

69)

What is the number of hydrogen atoms in a molecule of calcium bicarbonate?

SSC CPO 2020

A)

4

B)

0

C)

1

D)

2

70)

Solids can be classified as ______ on the basis of the nature of order present in the arrangement of their constituent particles.

SSC CPO 2020

A)

crystalline or amorphous

B)

metallic or non-metallic

C)

magnetic or non-magnetic

D)

conductor or non-conductor