Plus 2 Lecturer Mixed Practice Test #427

Question 1

India assumed G20 presidency on:‌​‍

Accepted Answer

1 December 2022 — India assumed the G20 presidency on 1 December 2022, holding it until 30 November 2023.‌​‍

Answer

1 January 2023

Answer

15 August 2022

Answer

1 November 2022

Question 2

An antacid like magnesium hydroxide neutralises excess stomach acid by:‌​‍

Accepted Answer

Acid-base neutralisation — Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O (neutralising HCl in stomach).‌​‍

Answer

Oxidation

Answer

Reduction

Answer

Combustion

Question 3

Which matrix represents a counter-clockwise rotation by angle θ?‌​‍

Accepted Answer

[[cos,-sin],[sin,cos]] — Counter-clockwise rotation. ‌​‍Product of two rotations is a rotation by sum of angles.

Answer

Zero matrix

Answer

Identity

Answer

[[sin,cos],[-cos,sin]]

Question 4

An optical fiber transmits light efficiently based on the principle of Total Internal Reflection (TIR). Which of the following conditions is most essential for TIR to occur when light travels from the core (denser medium) to the cladding (rarer medium) of an optical fiber?

Accepted Answer

C. The angle of incidence must be greater than the critical angle. — Total Internal Reflection (TIR) occurs when two conditions are met: first, light must travel from an optically denser medium to an optically rarer medium. Second, the angle of incidence in the denser medium must be greater than the critical angle. If the angle of incidence is less than the critical angle, refraction will occur, and light will pass into the rarer medium. The angle of refraction being 90 degrees defines the critical angle itself, not the condition for TIR.

Answer

A. The angle of incidence must be less than the critical angle.

Answer

B. The angle of refraction must be exactly 90 degrees.

Answer

D. The refractive index of the cladding must be greater than that of the core.

Question 5

Chirality in organic molecules requires:

Accepted Answer

sp³ carbon bonded to four different groups — Stereocenter. Pair of enantiomers rotate plane of polarized light oppositely. Important in drugs (thalidomide disaster).

Answer

Double bond

Answer

sp² carbon

Answer

sp carbon

Question 6

What is the primary objective of microteaching in teacher training programs?

Accepted Answer

B. To develop specific teaching skills in a controlled, simplified setting. — Microteaching's core purpose is to isolate and develop individual teaching skills, such as questioning or explaining, within a simplified classroom environment. This controlled setting allows for focused practice and immediate feedback, making skill acquisition more manageable and effective than in a full classroom.

Answer

A. To provide extensive practice in managing large classrooms.

Answer

C. To replace traditional practice teaching with a more efficient method.

Answer

D. To evaluate a teacher's overall competence before full-time employment.

Question 7

Kerala Budget presented by:

Accepted Answer

Finance Minister — FM presents state budget.

Answer

CM

Answer

Governor

Answer

President

Question 8

The correctly spelled word is:‌​‍

Accepted Answer

Receive — 'I before E except after C' — receive, ceiling, deceive.‌​‍

Answer

Recive

Answer

Recieve

Answer

Receeve

Question 9

Which is called a board on which an artist mixes colours?

Accepted Answer

Palette — Palette — artist's mixing board. (Palate=mouth roof; Pallet=platform; Palliate=relieve)

Answer

Palate

Answer

Pallet

Answer

Palliate

Question 10

Expand (x − 2)²:

Accepted Answer

x² − 4x + 4 — (a−b)² = a² − 2ab + b².

Answer

x² − 4

Answer

x² + 4x + 4

Answer

x² − 4x

Plus 2 Lecturer Mixed Practice Test #427