DCOA Mixed Practice Test #404

Question 1

Which metal is extracted by electrolysis of alumina in cryolite?‌​‍

Accepted Answer

Aluminium (Hall-Héroult) — Al₂O₃ dissolved in molten cryolite (Na₃AlF₆) is electrolysed at ~1000 °C to yield Al.‌​‍

Answer

Iron

Answer

Zinc

Answer

Copper

Question 2

Which metal is used to make electromagnet?‌​‍

Accepted Answer

Soft iron — Soft iron has high magnetic permeability and low retentivity — ideal core for electromagnets.‌​‍

Answer

Copper

Answer

Cobalt

Answer

Stainless steel

Question 3

The alloy of copper and tin is:‌​‍

Accepted Answer

Bronze — Bronze = Copper + Tin. ‌​‍Brass = Copper + Zinc. Steel = Iron + Carbon. ‌​‍Solder = Lead + Tin.

Answer

Brass

Answer

Steel

Answer

Solder

Question 4

PVC stands for:‌​‍

Accepted Answer

Polyvinyl Chloride — PVC = polymer of vinyl chloride (CH₂=CHCl); used in pipes, wires, flooring.‌​‍

Answer

Plastic Vinyl Cover

Answer

Polymer Vinyl Compound

Answer

Polymerised Vaporised Carbon

Question 5

Keratin in:‌​‍

Accepted Answer

Hair, nails, skin — Structural protein.‌​‍

Answer

Blood

Answer

Muscles

Answer

Bones

Question 6

The school Malala attended, founded by her father, was called:‌​‍

Accepted Answer

Khushal School — Ziauddin Yousafzai ran Khushal Public School where Malala studied.‌​‍

Answer

Taliban School

Answer

Mingora School

Answer

Swat School

Question 7

Water is made up of which two elements?‌​‍

Accepted Answer

Hydrogen and Oxygen — Water (H₂O) is made up of Hydrogen and Oxygen — 2 atoms of Hydrogen and 1 atom of Oxygen.‌​‍

Answer

Oxygen and Carbon

Answer

Hydrogen and Nitrogen

Answer

Nitrogen and Oxygen

Question 8

Periyar Wildlife Sanctuary is in:‌​‍

Accepted Answer

Idukki — Periyar Tiger Reserve in Thekkady, Idukki district.‌​‍

Answer

Wayanad

Answer

Palakkad

Answer

Thrissur

Question 9

Ayyankali founded the Sadhu Jana Paripalana Sangham in:‌​‍

Accepted Answer

1907 — Ayyankali founded the Sadhu Jana Paripalana Sangham in 1907 at Venganoor, fighting for the rights of Dalits in Travancore.‌​‍

Answer

1903

Answer

1905

Answer

1910

Question 10

Which statement is INCORRECT about the Malabar Rebellion? ‌​‍(I) First All Kerala Provincial Conference at Manjeri 1921 (II) Presided over by T. Prakasham (III) Malabar Rebellion also broke out 1921 (IV) First direct attack held at Pookkottur in August 1921

Accepted Answer

Only (II) — The First All Kerala Provincial Conference at Manjeri 1921 was presided over by T.K. ‌​‍Madhavan, not T. Prakasham.

Answer

Only (IV)

Answer

Only (III)

Answer

Only (I)

DCOA Mixed Practice Test #404