DCOA Mixed Practice Test #221

Question 1

The Prime Minister who started privatization in Britain was:‌​‍

Accepted Answer

Margaret Thatcher — Thatcher (PM 1979–1990) spearheaded large-scale privatization; also called the 'Iron Lady'.‌​‍

Answer

Winston Churchill

Answer

Tony Blair

Answer

John Major

Question 2

In the context of nuclear fission reactors, what is the primary purpose of a moderator like heavy water (D2O) in a thermal reactor?

Accepted Answer

B. To slow down fast neutrons to thermal energies for sustained fission reactions — A moderator slows down fast neutrons (with energies ~1 MeV) emitted during fission to thermal energies (~0.025 eV), which increases the probability of further fission reactions in U-235. Option A describes a control rod's function, C is incorrect as thermal energy conversion is handled by heat exchangers/turbines, and D refers to shielding materials like lead or concrete.

Answer

A. To absorb excess neutrons and prevent chain reactions from escalating

Answer

C. To convert thermal energy directly into electrical energy via thermionic emission

Answer

D. To shield the reactor core from gamma radiation emitted during fission

Question 3

Second law of thermodynamics:‌​‍

Accepted Answer

Entropy of universe tends to increase — ΔS_universe ≥ 0. Third law: entropy of perfect crystal at 0 K is zero.‌​‍

Answer

Heat flows cold to hot

Answer

Energy conserved

Answer

Absolute zero achievable

Question 4

Before beginning a new unit on the circulatory system, a biology teacher presents a short overview highlighting the main functions of the heart, blood vessels, and blood, and connects these to the students' prior knowledge of the human body. This teaching strategy is an example of applying which of Ausubel's concepts?

Accepted Answer

B. Advance organizer — David Ausubel emphasized the importance of meaningful learning and proposed advance organizers as a key tool. An advance organizer is introductory material presented before a new learning task, designed to help learners connect new information to their existing cognitive structures by providing a conceptual framework. Reciprocal teaching is a Vygotskian strategy, and rote learning is the opposite of meaningful learning.

Answer

A. Reciprocal teaching

Answer

C. Inductive reasoning

Answer

D. Rote learning

Question 5

Sabarimala review pending before:‌​‍

Accepted Answer

9-judge — Referred to 9-judge bench.‌​‍

Answer

11-judge

Answer

5-judge

Answer

7-judge

Question 6

Vallam Kali (boat race) is associated with:‌​‍

Accepted Answer

Onam — Vallam Kali (snake boat races) are held during Onam celebrations, especially in Alappuzha.‌​‍

Answer

Vishu

Answer

Christmas

Answer

Eid

Question 7

Crypto tax India:‌​‍

Accepted Answer

30% plus 1% TDS — Introduced in Budget 2022.‌​‍

Answer

5%

Answer

20%

Answer

Nil

Question 8

'Rihla' was written by:‌​‍

Accepted Answer

Ibn Battuta — Ibn Battuta wrote Rihla (Travels) about his journeys including his time in Muhammad bin Tughlaq's India.‌​‍

Answer

Al-Biruni

Answer

Marco Polo

Answer

Megasthenes

Question 9

The oldest irrigation project in Kerala is:‌​‍

Accepted Answer

Pothundi — Pothundi (Palakkad) is Kerala's oldest irrigation project, completed in 1927.‌​‍

Answer

Peechi

Answer

Neyyar

Answer

Malampuzha

Question 10

Methane gas was discovered by:‌​‍

Accepted Answer

Alessandro Volta — Volta discovered methane in 1776.‌​‍

Answer

Alexander Fleming

Answer

John Dalton

Answer

Thomas Alva Edison

DCOA Mixed Practice Test #221