KAS Prelims Mixed Practice Test #937

Question 1

In the context of environmental biotechnology, what is the most significant advantage of employing genetically engineered microorganisms (GEMs) compared to naturally occurring microbial strains for the bioremediation of complex industrial waste containing recalcitrant organic compounds?

Accepted Answer

C. GEMs can be specifically designed to possess novel metabolic pathways or enhanced expression of existing enzymes, leading to more efficient and targeted degradation of specific recalcitrant pollutants. — The primary advantage of genetically engineered microorganisms (GEMs) in bioremediation is their ability to be specifically designed. This engineering allows them to acquire novel metabolic pathways or enhance existing enzymatic activities, enabling more efficient and targeted breakdown of recalcitrant organic pollutants that natural microbes struggle to degrade. While other options present potential outcomes or features, they are either overstatements, not universally true, or secondary to the fundamental engineered capability.

Answer

A. GEMs can naturally adapt to a broader spectrum of extreme pH and temperature conditions, making them universally applicable without prior site assessment.

Answer

B. GEMs are capable of completely mineralizing pollutants into inert inorganic compounds, thereby eliminating all secondary environmental impacts.

Answer

D. GEMs require significantly less incubation time and nutrient supplementation in situ, making them a more cost-effective solution for large-scale environmental clean-up projects.

Question 2

If three 60 W bulbs operate for 5 hours daily for 30 days, energy consumed is:‌​‍

Accepted Answer

27 kWh — Total power = 180 W; E = 180 × 5 × 30 = 27,000 Wh = 27 kWh.‌​‍

Answer

90 kWh

Answer

54 kWh

Answer

9 kWh

Question 3

The printing press was invented by:‌​‍

Accepted Answer

Gutenberg — Johannes Gutenberg invented the movable-type printing press (~1440) in Germany.‌​‍

Answer

Caxton

Answer

Edison

Answer

Marconi

Question 4

Continuity of f at c means:

Accepted Answer

Both exist and are equal — lim f(x) as x→c equals f(c). Differentiable → continuous (reverse not necessarily).

Answer

f(c) exists

Answer

lim(x→c) f(x) exists

Answer

No jump

Question 5

Critical temperature of a gas is:‌​‍

Accepted Answer

Temperature above which it cannot be liquefied by pressure alone — For water 647 K; CO₂ 304 K. Below T_c, apply pressure → liquefies.‌​‍

Answer

Melting point

Answer

Boiling point

Answer

Triple point

Question 6

Rajaraja I Chola (r. 985-1014) built the great temple at:

Accepted Answer

Thanjavur (Brihadeeshwara / Rajarajeshwaram) — UNESCO Great Living Chola Temples. Vimana ~66m, capstone ~80 tonnes. Son Rajendra I extended empire to Ganga (Gangaikonda Cholapuram) and SE Asia (Srivijaya).

Answer

Madurai

Answer

Kanchipuram

Answer

Chidambaram

Question 7

Which region in Kerala is famous for its natural sandalwood forests?‌​‍

Accepted Answer

Marayoor — Marayoor (Idukki) has Kerala's only natural sandalwood forest.‌​‍

Answer

Meenachil

Answer

Peermed

Answer

Nenmara

Question 8

Tense — present perfect:

Accepted Answer

I have eaten (action completed with present relevance) — 'Have/has + past participle'. Just, already, yet, since, for. Connects past to present.

Answer

I eat

Answer

I was eating

Answer

I will eat

Question 9

Sati (widow immolation) banned by:‌​‍

Accepted Answer

British Lord William Bentinck (1829) — Regulation XVII of 1829. ‌​‍Raja Ram Mohan Roy's campaign. Sati (Prevention) Act 1987 reinforced after Roop Kanwar case.

Answer

Aurangzeb

Answer

Akbar

Answer

Jawaharlal Nehru

Question 10

Purna Swaraj declared at (1929):‌​‍

Accepted Answer

Lahore — Lahore, Jawaharlal Nehru as president.‌​‍

Answer

Calcutta

Answer

Nagpur

Answer

Karachi

KAS Prelims Mixed Practice Test #937