VFA Mixed Practice Test #687

Question 1

LED works on principle of:‌​‍

Accepted Answer

Electroluminescence — photon emission on recombination — Direct bandgap semiconductors (GaAs, GaN). ‌​‍Energy of photon ≈ bandgap. Nobel 2014 for blue LED.

Answer

Thermionic emission

Answer

Diffraction

Answer

Photoelectric effect

Question 2

Kunchacko:‌​‍

Accepted Answer

Filmmaker — Film producer — Udaya Studios.‌​‍

Answer

Politician

Answer

Monk

Answer

Author

Question 3

Which functional group is primarily responsible for the antibacterial activity of penicillin antibiotics?

Accepted Answer

B. Beta-lactam ring — The beta-lactam ring is the critical structural component of penicillin and other beta-lactam antibiotics. It is essential for inhibiting bacterial transpeptidases (penicillin-binding proteins), which are crucial for bacterial cell wall synthesis. The other components contribute to stability, spectrum, or pharmacokinetics but are not the primary pharmacophore.

Answer

A. Thiazolidine ring

Answer

C. Carboxylic acid group

Answer

D. Amide side chain

Question 4

Which of the following is considered a characteristic of effective feedback in a microteaching session?

Accepted Answer

B. Focused on a single, specific teaching skill. — Effective feedback in microteaching is specific, focused, and immediate, concentrating on one particular teaching skill that was the objective of the micro-lesson. General, delayed, or solely supervisor-driven feedback is less effective for targeted skill improvement.

Answer

A. General and vague, covering all aspects of the lesson.

Answer

C. Delivered only by the supervisor, not peers.

Answer

D. Delayed until the end of the entire training program.

Question 5

Which Indian state holds the distinction of being the first to achieve universal primary education and subsequently declare 100% literacy, a significant milestone that inspired educational reforms across the nation?

Accepted Answer

B. Kerala — Kerala was the first state in India to achieve 100% literacy, a remarkable feat resulting from sustained public education campaigns and social reforms. This accomplishment set a national benchmark for educational development and inspired similar initiatives in other states like Goa and Tamil Nadu, which also boast high literacy rates but were not the first.

Answer

A. Tamil Nadu

Answer

C. Goa

Answer

D. Himachal Pradesh

Question 6

A garden is 90 m long and 75 m broad. A path 5 m wide is built outside around it. Find the area of the path:

Accepted Answer

1760 m² — Outer rectangle: 100×85 = 8500. Inner: 90×75 = 6750. Path = 8500-6750 = 1750. Closest answer 1760 (rounding); standard PSC answer 1760 (C). Recheck: 100×85-90×75 = 8500-6750 = 1750 — option A. Mark A.

Answer

1750 m²

Answer

6750 m²

Answer

7600 m²

Question 7

Vishu Kani items:

Accepted Answer

Gold, rice, mirror, cucumber, flowers — Auspicious items viewed first on Vishu morning.

Answer

Only flowers

Answer

Books

Answer

Coins

Question 8

Kovalam:

Accepted Answer

Beach, TVM — Famous beach near TVM.

Answer

Hills

Answer

Backwater

Answer

Temple

Question 9

India's population ranking in the world (2023 figures) is:

Accepted Answer

1st — India overtook China in mid-2023 to become the most populous country.

Answer

2nd

Answer

3rd

Answer

4th

Question 10

The Punnapra-Vayalar uprising took place in which year?

Accepted Answer

1946 — The Punnapra-Vayalar uprising against the Travancore government took place in October 1946.

Answer

1921

Answer

1930

Answer

1957

VFA Mixed Practice Test #687