Plus 2 Lecturer Mixed Practice Test #245

Question 1

The reflection of sound heard as echo requires the reflecting surface to be at least approximately:

Accepted Answer

17 metres away — For echo, reflected sound must arrive ≥0.1 s later: distance ≥ 343×0.1/2 ≈ 17 m.

Answer

1 metre away

Answer

100 metres

Answer

1000 metres

Question 2

Longyearbyen, the northernmost human settlement, is in:

Accepted Answer

Svalbard Islands (Norway) — Longyearbyen is on Spitsbergen island of the Svalbard archipelago, Norway.

Answer

Greenland

Answer

Alaska

Answer

Siberia

Question 3

Antonym of DARK:

Accepted Answer

Light — Dark ↔ light.

Answer

Dim

Answer

Black

Answer

Shadow

Question 4

Which literary form is best suited for summarizing a complex concept through a short, rhythmic verse or rhyme, making it easier for students to recall information?

Accepted Answer

B. Poem — A poem uses rhythmic and rhyming language to condense complex ideas into a memorable format, aiding retention. Essays and reports are prose-based and less rhythmic, while drama relies on performance rather than concise recall.

Answer

A. Essay

Answer

C. Drama

Answer

D. Report

Question 5

President's salary:

Accepted Answer

₹5 lakh — ₹5 lakh per month.

Answer

₹1.5 lakh

Answer

₹3 lakh

Answer

₹10 lakh

Question 6

'Each of the boys (A) have (B) completed (C) their work (D).' Error is in:‌​‍

Accepted Answer

B — 'Each' is singular → 'has' not 'have'. ‌​‍Correct: 'Each of the boys has completed his work.'

Answer

A

Answer

C

Answer

D

Question 7

Positive deviation from Raoult's law:‌​‍

Accepted Answer

ΔH_mix > 0 (weaker A-B forces); forms min-boiling azeotrope — Ethanol + water. Negative deviation (HCl + water) → max-boiling azeotrope.‌​‍

Answer

ΔH = 0

Answer

ΔH < 0

Answer

No change

Question 8

'Torah' is the sacred book of which religion?‌​‍

Accepted Answer

Judaism — The Torah is the central reference of Judaism.‌​‍

Answer

Zoroastrianism

Answer

Buddhism

Answer

Jainism

Question 9

K. Karunakaran:

Accepted Answer

CM (multiple terms) — Former CM, senior Congress leader.

Answer

Actor

Answer

Writer

Answer

Industrialist

Question 10

Barium sulfate is widely used as a radiocontrast agent for imaging the gastrointestinal tract. Despite the inherent toxicity of soluble barium compounds, barium sulfate is safe for this application due to which key chemical property?

Accepted Answer

C. Its extreme insolubility in water and biological fluids. — Barium sulfate is safe as a contrast agent because it is highly insoluble in water and biological fluids. This insolubility prevents the absorption of toxic barium ions into the bloodstream from the gastrointestinal tract. If it were soluble, the barium ions would be absorbed and cause significant toxicity.

Answer

A. Its high solubility in water and biological fluids.

Answer

B. Its rapid absorption into the systemic circulation from the GI tract.

Answer

D. Its strong chelating properties with heavy metals.

Plus 2 Lecturer Mixed Practice Test #245