The metallurgical process in which a metal is obtained in a fused state is called

The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by

A

Electrolysis

B

Electrolytic reduction

C

Electrolytic oxidation

D

None of these

__________ is an ore concentrating metallurgical process involving a chemical change.

A

Electromagnetic separation

B

Froth floatation

C

Roasting

D

None of these

Hot face insulating linings of high purity alumina fused mullite are used, where

A

Very high temperatures are involved

B

Highly reducing conditions are involved

C

Presence of iron or silica is harmful

D

All of the above

In birds, some of the vertebrae are fused to form

A

Keel

B

Furcula

C

Syncytium

D

Synsacrum

The average mark obtained by 15 students was 10 and the average mark obtained by 10 students was 15. What was the average mark obtained by all students?

A

10

B

8

C

12

D

15

The average mark obtained by 10 students was 6 and the average mark obtained by 6 other students was 10. What was the average mark obtained by all 16 students?

A

10

B

8

C

7.5

D

8.5

The average mark obtained by 10 students was 6 and the average mark obtained by 6 students was 10. What is the average mark obtained by all 16 students ?

A

10

B

8

C

7.5

D

8.5

The total number obtained by a student in Physics, Chemistry and Mathematics together is 120 more than the marks obtained by him in Chemistry. What is the average mark obtained by him in Physics and Mathematics together?

A

40

B

60

C

120

D

Cannot be determined

Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?

A

Pyrometer

B

Thermocouple

C

Thermometer

D

Thermistor

Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?

A

NO_x

B

Hg

C

SO₂

D

F

The metallurgical process in which a metal is obtained in a fused state is called

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