DCOA Mixed Practice Test #180

Question 1

Kerala gold smuggling case:

Accepted Answer

2020 — 2020 UAE consulate case.

Answer

2018

Answer

2022

Answer

2019

Question 2

Laughing gas is:‌​‍

Accepted Answer

N₂O — N₂O (Nitrous Oxide) = Laughing Gas. Used as anaesthetic.‌​‍

Answer

CO

Answer

CO₂

Answer

NO

Question 3

India's first indigenous semiconductor fab announced in:‌​‍

Accepted Answer

Gujarat — Dholera, Gujarat — semiconductor fab under India Semiconductor Mission.‌​‍

Answer

Maharashtra

Answer

Karnataka

Answer

Tamil Nadu

Question 4

Which statement about the impact of the French Revolution is WRONG?

Accepted Answer

Little improvement in the condition of middle class — The French Revolution greatly expanded middle-class political and economic rights.

Answer

End of autocratic rule of Bourbon Kings

Answer

Decline in the supremacy of the Church

Answer

Declaration of Human Rights

Question 5

Number of amino acids coded by 64 codons:‌​‍

Accepted Answer

20 (with some redundancy — several codons per amino acid) — Degeneracy: leucine, serine, arginine have 6 codons each. ‌​‍Wobble hypothesis explains tRNA flexibility.

Answer

100

Answer

64

Answer

10

Question 6

A 6-month-old infant receives antibodies from their mother through breastfeeding, providing temporary protection against certain infections. This type of immunity is known as:

Accepted Answer

C. Naturally acquired passive immunity — Naturally acquired passive immunity occurs when antibodies are transferred from a mother to her child, either across the placenta during pregnancy or through breast milk. This provides immediate but temporary protection as the infant's own immune system is not actively producing antibodies. Active immunity involves the body's own immune response, while artificial immunity involves medical intervention like vaccines or antibody injections.

Answer

A. Naturally acquired active immunity

Answer

B. Artificially acquired active immunity

Answer

D. Artificially acquired passive immunity

Question 7

Blood group that is universal donor:‌​‍

Accepted Answer

O — O negative — universal donor (no A, B antigens, no Rh factor).‌​‍

Answer

A

Answer

B

Answer

AB

Question 8

V.D. Satheesan:‌​‍

Accepted Answer

Leader of Opposition (Kerala 2021+) — LoP in Kerala Assembly.‌​‍

Answer

CM

Answer

Governor

Answer

Speaker

Question 9

Total internal reflection used in:‌​‍

Accepted Answer

Optical fibres — Light stays inside fibre. Also mirage.‌​‍

Answer

Batteries

Answer

Mirrors

Answer

Speakers

Question 10

The gas used in fire extinguishers is:‌​‍

Accepted Answer

Carbon Dioxide — Carbon Dioxide (CO₂) is used in fire extinguishers because it is heavier than air, non-combustible, and smothers the fire by cutting off oxygen supply.‌​‍

Answer

Oxygen

Answer

Hydrogen

Answer

Nitrogen

DCOA Mixed Practice Test #180