DCOA Mixed Practice Test #251

Question 1

Class system is characterised by:‌​‍

Accepted Answer

Achieved status, mobility, economic basis — Class: socio-economic groupings based on wealth/income/occupation. ‌​‍Allows social mobility; distinguishes modern industrial societies from caste-based traditional ones.

Answer

Religious sanction

Answer

Birth-based

Answer

Hereditary

Question 2

The Tyndall effect is exhibited by:‌​‍

Accepted Answer

Colloids — Colloidal particles scatter light, making beam visible — Tyndall effect.‌​‍

Answer

Gases only

Answer

Pure liquids

Answer

True solutions

Question 3

In Bohr's model of the atom, electrons revolve in:

Accepted Answer

Fixed circular orbits with quantised energy — Bohr (1913) postulated quantised, stable circular orbits to explain hydrogen's spectrum.

Answer

Random paths

Answer

Elliptical orbits only

Answer

Cloud-like regions

Question 4

The loudness of sound is measured in:‌​‍

Accepted Answer

Decibel (dB) — Decibel is a logarithmic unit: 10 dB = whisper, 90 dB = traffic, 120+ dB = pain.‌​‍

Answer

Watt

Answer

Joule

Answer

Hertz

Question 5

Odd one: Oxygen, Nitrogen, Carbon Dioxide, Hydrogen‌​‍

Accepted Answer

Carbon Dioxide — CO₂ is a compound. Others are elements.‌​‍

Answer

Oxygen

Answer

Nitrogen

Answer

Hydrogen

Question 6

Dimensional analysis CANNOT:

Accepted Answer

Derive constants' numerical values — Dimensionless constants (like ½ in ½mv²) cannot be determined by dimensional analysis.

Answer

Check equations

Answer

Find dimensional formulas

Answer

Convert units

Question 7

The period of Emergency declared in India from 1975 to 1977 represented a significant challenge to the country's democratic institutions. Which of the following statements most accurately reflects a key constitutional consequence or debate that emerged directly from this period?

Accepted Answer

B. The introduction of the 42nd Amendment Act, which significantly curtailed judicial review and strengthened the executive's powers, prompting debates on the basic structure doctrine. — The 42nd Amendment Act, passed during the Emergency, significantly altered the Indian Constitution by attempting to curtail judicial review and strengthen the executive's powers. This controversial act prompted crucial debates and subsequent judicial pronouncements upholding the 'Basic Structure Doctrine' to protect the fundamental features of the Constitution. Option A is incorrect as fundamental rights were suspended, not permanently abolished, and C and D describe constitutional changes or bodies that did not materialize in the manner suggested.

Answer

A. The immediate and permanent abolition of fundamental rights, leading to a complete overhaul of the judicial system.

Answer

C. A shift from a parliamentary to a presidential system of government to prevent future political instability.

Answer

D. The establishment of a new independent body specifically to oversee and approve all future declarations of national emergency.

Question 8

Who made the Temple Entry Proclamation in Travancore?‌​‍

Accepted Answer

Sree Chithira Thirunal — Sree Chithira Thirunal Balarama Varma proclaimed temple entry on 12 November 1936.‌​‍

Answer

Sree Moolam Thirunal

Answer

Rani Gowri Lakshmi Bai

Answer

Swathi Thirunal

Question 9

Marthanda Varma defeated the Dutch at the Battle of:‌​‍

Accepted Answer

Colachel — The Battle of Colachel (1741) saw Travancore king Marthanda Varma defeat the Dutch, ending their colonial power in Kerala.‌​‍

Answer

Kayamkulam

Answer

Ambalapuzha

Answer

Poovar

Question 10

Which is the only district in Kerala without a coastline on the Arabian Sea?

Accepted Answer

Both Idukki and Wayanad — Both Idukki and Wayanad are landlocked districts with no Arabian Sea coastline.

Answer

Idukki

Answer

Wayanad

Answer

Pathanamthitta

DCOA Mixed Practice Test #251