LGS Mixed Practice Test #225

Question 1

Penicillins are a class of beta-lactam antibiotics. Their antibacterial activity is primarily due to the presence of the beta-lactam ring, which acts by:

Accepted Answer

D. Inhibiting bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs). — Penicillins, like other beta-lactam antibiotics, exert their bactericidal effect by inhibiting the synthesis of the bacterial cell wall. They achieve this by covalently binding to and inactivating penicillin-binding proteins (PBPs), which are transpeptidases essential for peptidoglycan cross-linking. The other options describe mechanisms of action of different classes of antibiotics.

Answer

A. Inhibiting bacterial protein synthesis by binding to the 50S ribosomal subunit.

Answer

B. Disrupting bacterial cell membrane integrity.

Answer

C. Interfering with bacterial DNA replication.

Question 2

Who won the Jnanpith Award in 1995?‌​‍

Accepted Answer

U.R. Ananthamurthy — U.R. Ananthamurthy (Kannada) won the 1994 Jnanpith, presented in 1995.‌​‍

Answer

Mahasweta Devi

Answer

O.N.V. Kurup

Answer

M.T. Vasudevan Nair

Question 3

Kerala's first CM after statehood:‌​‍

Accepted Answer

EMS Namboodiripad — EMS 1957 first elected.‌​‍

Answer

Pattom Thanu Pillai

Answer

Ikkanda Warrior

Answer

Sankar

Question 4

What is the probability of a certain event?‌​‍

Accepted Answer

1 — Impossible event: 0. All probabilities in [0,1]. Sum over sample space = 1.‌​‍

Answer

0.5

Answer

∞

Answer

0

Question 5

Pre-historic site in Kerala:‌​‍

Accepted Answer

Edakkal caves, Marayoor dolmens — Multiple sites.‌​‍

Answer

Only Edakkal

Answer

Only Marayoor

Answer

None

Question 6

Vaccine Maitri (diplomacy) involved India exporting vaccines to:‌​‍

Accepted Answer

~100 countries from Jan 2021 — India's Vaccine Maitri (Jan 2021 onwards) — exported COVISHIELD/COVAXIN to nearly 100 countries before focusing on domestic vaccination.‌​‍

Answer

Only SAARC nations

Answer

Only Africa

Answer

EU countries

Question 7

A walks 3m N, then 4m E. Displacement:‌​‍

Accepted Answer

5m — North and East are perpendicular. ‌​‍Displacement is the straight-line distance from start to end = √(3² + 4²) = √25 = 5m (by Pythagoras).

Answer

10m

Answer

1m

Answer

7m

Question 8

What does humanistic psychology primarily emphasise?‌​‍

Accepted Answer

Self-actualisation, growth (Maslow, Rogers) — 'Third force'. ‌​‍Maslow's hierarchy of needs. Carl Rogers' client-centered therapy.

Answer

Unconscious

Answer

Cognition only

Answer

Stimulus-response

Question 9

The Black Death (bubonic plague) killed what fraction of Europe's population?‌​‍

Accepted Answer

~30-50% (1347-51) — Black Death (1347-1351) killed 75-200 million globally; 30-50% of Europe's population. ‌​‍Transformed labour markets, ended serfdom in many regions.

Answer

~75%

Answer

~25%

Answer

~10%

Question 10

Swathi Thirunal ruled:‌​‍

Accepted Answer

Travancore — Musician king of Travancore (1829-46).‌​‍

Answer

Kochi

Answer

Cochin

Answer

Malabar

LGS Mixed Practice Test #225