DCOA Mixed Practice Test #104

Question 1

Sustainable Development was defined by Brundtland Commission (1987) as:

Accepted Answer

Meeting present needs without compromising future generations — Our Common Future (1987): sustainable development balances economic, social, and environmental needs across generations.

Answer

Economic growth

Answer

Zero growth

Answer

Environmentalism only

Question 2

Which hypothesis links poor foetal nutrition to adult diseases like type-2 diabetes and hypertension?

Accepted Answer

Barker Hypothesis — David Barker's hypothesis — the foetal origins of adult disease (DOHaD).

Answer

Germ Theory

Answer

Miasma Theory

Answer

Central Dogma

Question 3

Kasaragod formed:‌​‍

Accepted Answer

1984 — 24 May 1984.‌​‍

Answer

1980

Answer

1990

Answer

1956

Question 4

Mangrove forests in India:‌​‍

Accepted Answer

Sundarbans, Bhitarkanika, Pichavaram — Coastal mangroves.‌​‍

Answer

Thar

Answer

Himalayas

Answer

Nilgiris

Question 5

Maximum range of projectile for fixed initial speed occurs at angle:

Accepted Answer

45° — R = u² sin(2θ)/g is maximum when sin(2θ)=1 i.e. θ=45° (neglecting air resistance).

Answer

30°

Answer

60°

Answer

90°

Question 6

Which Kerala social reformer is popularly known as a 'saint without saffron and kamandalu'?‌​‍

Accepted Answer

Sree Narayana Guru — Sree Narayana Guru was called a 'saint without saffron and kamandalu' for rejecting such external trappings.‌​‍

Answer

Ayya Swamikal

Answer

Chattampi Swamikal

Answer

Vagbhatananda Swamikal

Question 7

TVM Science and Tech Museum:‌​‍

Accepted Answer

VSSC proximity — Near VSSC in Thiruvananthapuram.‌​‍

Answer

NH-66

Answer

Fort

Answer

Kovalam

Question 8

Chemmeen by:‌​‍

Accepted Answer

Thakazhi — Thakazhi Sivasankara Pillai (1956).‌​‍

Answer

Basheer

Answer

Vijayan

Answer

M.T.

Question 9

In an experiment demonstrating the photoelectric effect, it is observed that electrons are only ejected from a metal surface if the incident light's frequency exceeds a specific threshold, irrespective of the light's intensity. Furthermore, for frequencies above this threshold, increasing the light's intensity increases the *number* of ejected electrons, but not their *maximum kinetic energy*. This set of observations provides strong evidence for which of the following?

Accepted Answer

C. The quantum nature of light, where energy is transferred in discrete packets called photons. — Option C accurately reflects that the quantum nature of light, specifically the photon concept (E=hν), is required to explain the observed phenomena of the photoelectric effect. The existence of a threshold frequency implies that energy is transferred in discrete packets (photons), each needing sufficient energy to overcome the metal's work function. Classical wave theory (Option B) fails to explain the threshold frequency and predicts that electron kinetic energy should increase with light intensity, contradicting observations. Options A and D are unrelated or do not provide the fundamental e

Answer

A. The inverse square law governing the intensity of light.

Answer

B. The classical wave theory of light, predicting continuous energy transfer to electrons.

Answer

D. The principle of conservation of momentum in light-matter interactions.

Question 10

Brexit (UK leaving EU) officially happened on:‌​‍

Accepted Answer

31 January 2020 — Referendum 23 June 2016 voted Leave. ‌​‍UK officially left EU 31 January 2020. Transition period ended 31 December 2020. ‌​‍First country to leave EU.

Answer

Not yet

Answer

23 June 2016 (vote)

Answer

31 December 2020

DCOA Mixed Practice Test #104