DCOA Mixed Practice Test #234

Question 1

Nylon is a:

Accepted Answer

Synthetic polyamide polymer — Nylon (Wallace Carothers, 1935) is a synthetic polyamide — nylon-6, nylon-66.

Answer

Natural fibre

Answer

Natural polyester

Answer

Mineral

Question 2

Low thyroxine levels cause:‌​‍

Accepted Answer

Hypothyroidism (e.g., myxoedema, cretinism) — Insufficient thyroxine → low metabolism, weight gain, fatigue.‌​‍

Answer

Diabetes

Answer

Gigantism

Answer

Hyperthyroidism

Question 3

In a nuclear fission reactor, moderators like heavy water (D2O) or graphite play a crucial role. What is their primary function in sustaining a controlled chain reaction?

Accepted Answer

C. To slow down fast neutrons, thereby increasing the likelihood of their absorption by uranium-235 nuclei. — Moderators are used to slow down the fast neutrons produced during fission. These 'thermal' neutrons are much more likely to be absorbed by uranium-235 nuclei, which is essential for sustaining a controlled chain reaction. Absorbing excess neutrons is the role of control rods, while coolants remove heat, and reflectors reduce neutron leakage.

Answer

A. To absorb excess neutrons to prevent the reactor from going supercritical.

Answer

B. To convert kinetic energy of neutrons into heat for power generation.

Answer

D. To reflect neutrons back into the reactor core, reducing neutron leakage.

Question 4

Chipko Movement was:‌​‍

Accepted Answer

Forest conservation hugging trees (Uttarakhand, 1973) — Sunderlal Bahuguna, Chandi Prasad Bhatt. ‌​‍Women prominent (Gaura Devi). Inspired Appiko in Karnataka.

Answer

Sports

Answer

Political

Answer

Urban

Question 5

Which statements are correct about India's performance in Paris Olympics 2024? ‌​‍(i) India won six medals (ii) Manu Bhaker won the first medal (iii) Neeraj Chopra won silver in javelin (iv) Aman Sehrawat won bronze in wrestling

Accepted Answer

All statements are correct — India's Paris 2024 tally: 6 medals, Manu Bhaker first (10m pistol bronze), Chopra silver in javelin, Aman bronze in wrestling 57kg.‌​‍

Answer

Only (i) and (iii)

Answer

Only (iii) and (iv)

Answer

Only (i) and (ii)

Question 6

Kerala Legislative Assembly has:‌​‍

Accepted Answer

140 seats — Kerala has 140 assembly seats. ‌​‍Kerala has a unicameral legislature (no upper house).

Answer

120 seats

Answer

126 seats

Answer

150 seats

Question 7

The Battle of Colachel (1741) was fought between Travancore under Marthandavarma and which European power?‌​‍

Accepted Answer

Dutch — Marthandavarma defeated the Dutch at Colachel — the first battle where a European power lost to an Indian ruler.‌​‍

Answer

Portuguese

Answer

British

Answer

French

Question 8

Taiwan's political status:‌​‍

Accepted Answer

De facto independent, claimed by PRC; recognised by ~13 countries — Taiwan (ROC) self-governing since 1949. ‌​‍Most countries recognise PRC (One China policy). USA maintains unofficial relations + Taiwan Relations Act.

Answer

China's province

Answer

UN member

Answer

Recognised country by most

Question 9

Modern periodic law is based on:

Accepted Answer

Atomic number — Henry Moseley (1913) — properties are periodic function of atomic number. Replaced Mendeleev's mass-based law.

Answer

Atomic mass

Answer

Neutron number

Answer

Electrons in outermost shell only

Question 10

Who wrote the song Kottiyoor Ulsavapattu?

Accepted Answer

Chavara Kuriakose Elias — Composed by St. Kuriakose Elias Chavara.

Answer

Chattampi Swamikal

Answer

Vakkom Maulavi

Answer

Vagbhatananda

DCOA Mixed Practice Test #234