11)

Who among the following scientists invented Kevlar?

SSC CGL 2020

A)

Marry Anderson

B)

George Eastman

C)

Stephanie Louise Kwolek

D)

Steve Wozniak

12)

Which of the following is used to remove the green colour from glass?

SSC CGL 2020

A)

Silicon dioxide

B)

Titanium dioxide

C)

Sulphur dioxide

D)

Manganese dioxide

13)

How many types of isotopes does Scandium have?

SSC CGL 2020

A)

7

B)

10

C)

9

D)

13

14)

What is the atomic mass of Zirconium?

SSC CGL 2020

A)

89.22

B)

90.22

C)

91.22

D)

88.22

15)

Which of the following gases is consistently seen to be most abundant in a volcanic eruption?

SSC CGL 2020

A)

Water vapour

B)

Carbon Dioxide

C)

Sulphur Dioxide

D)

Hydrogen Sulphide

16)

Which of the following is used as a substitute of mercury in thermometers?

SSC CGL 2020

A)

Arsenic

B)

Galinstan

C)

Selenium

D)

Bromine

17)

Which of the following acids is NOT present in grapes?

SSC CGL 2020

A)

Malic acid

B)

Acetic acid

C)

Tartaric acid

D)

Citric acid

18)

Which of the following is also known as Epsom salt?

SSC CGL 2020

A)

Sodium Sulphate

B)

Magnesium Sulphate

C)

Calcium Sulphate

D)

Ferrous Sulphate

19)

Which of the following is NOT an ore of iron?

SSC CGL 2020

A)

Cuprite

B)

Haematite

C)

Magnetite

D)

Siderite

20)

______ are homogeneous mixtures of two or more components.

SSC CGL 2020

A)

Amalgams

B)

Solutions

C)

Enzymes

D)

Emulsions