21)

What is the molecular formula for hydrochloric acid?

SSC CHSL 2021

A)

H₂SO₄

B)

HCl

C)

KOH

D)

HNO₃

22)

Chemicals called ______ link to form proteins.

SSC CHSL 2021

A)

citric acids

B)

oxalic acids

C)

nitric acids

D)

amino acids

23)

Which of the following has a tetragonal crystal system?

SSC CHSL 2021

A)

Potassium nitrate

B)

Cadmium sulphide

C)

Calcium sulphate

D)

Zinc oxide

24)

Which of the following cells is NOT used in watches?

SSC CHSL 2021

A)

Zinc air cell

B)

Silver oxide cell

C)

Lead acid cell

D)

Mercury cell

25)

Which of the following quantities is measured using a torsion balance?

SSC CHSL 2021

A)

Magnetism

B)

Force

C)

Charge

D)

Pressure

26)

India's first lithium refinery, which will process lithium ore to produce battery-grade material, will be set up in:

SSC CHSL 2021

A)

Madhya Pradesh

B)

Uttar Pradesh

C)

Rajasthan

D)

Gujarat

27)

‘PVC’ is a high strength thermoplastic material widely used in applications, such as pipes, medical devices, wire and cable insulation. What is the full form of PVC?

SSC CHSL 2021

A)

Polyvinyl Carbazole

B)

Polyvinyl Carbonate

C)

Polyvinyl Calcium

D)

Polyvinyl Chloride

28)

What is the pH value of acidic substances?

SSC CHSL 2021

A)

Below 1.0

B)

Below 2.0

C)

Below 7.0

D)

Below 4.0

29)

 ______ is a process of forming a thick oxide layer of aluminium.

SSC CHSL 2021

A)

Ductility

B)

Galvanisation

C)

Anodising

D)

Corrosion

30)

Which fibre among the following is used to make rayon clothing?

SSC CHSL 2021

A)

Pectin

B)

Mucilage

C)

Cellulose

D)

Gum