Plus 2 Lecturer Mixed Practice Test #738

Question 1

'Wings of Fire' is the autobiography of:‌​‍

Accepted Answer

Abdul Kalam — A.P.J. ‌​‍Abdul Kalam wrote Wings of Fire — his autobiography describing his life and career.

Answer

Vikram Sarabhai

Answer

Homi Bhabha

Answer

C.V. Raman

Question 2

India has ___% of world's land but ___% of biodiversity:‌​‍

Accepted Answer

2.4% land, 8% biodiversity — Very high biodiversity density. ‌​‍4 hotspots: Himalaya, Western Ghats, Indo-Burma, Sundaland (Nicobar).

Answer

50/50

Answer

10% land, 10%

Answer

0.1/1

Question 3

A student provides a brief and incomplete answer when asked about the causes of soil erosion. To encourage a more detailed and analytical response, the teacher should use the 'Probing Questions Skill' by asking:

Accepted Answer

C. 'That's a good start. Can you explain *how* deforestation contributes to soil erosion and what other factors are involved?' — The 'Probing Questions Skill' aims to elicit deeper, more comprehensive, or clarified responses from students. Option C effectively probes by asking for elaboration ('how deforestation contributes') and seeking additional information ('what other factors are involved?'), encouraging critical thinking and a more complete answer. Options A, B, and D are less effective for encouraging the initial student to provide a deeper response.

Answer

A. 'Is that all you can tell me about soil erosion?'

Answer

B. 'Can anyone else add to what was just said?'

Answer

D. 'Let's move on. Perhaps we can discuss this further in the next class.'

Question 4

'An expert team will visit our school next week.' Passive:‌​‍

Accepted Answer

Our school will be visited by an expert team next week — Future simple passive: will + be + past participle.‌​‍

Answer

Our school will visit by an expert team

Answer

Our school is visited by an expert team

Answer

Our school is being visited by an expert team

Question 5

Surface area of a cylinder open at top (base + curved) of radius r, height h:

Accepted Answer

2πrh + πr² — Open cylinder surface = curved (2πrh) + one circular base (πr²).

Answer

πr²

Answer

2πrh

Answer

πr(r+h)

Question 6

The drug thalidomide is known for its tragic history due to severe teratogenic effects. Chemically, thalidomide exists as a racemic mixture of two enantiomers. Which statement best explains the pharmacological significance of these enantiomers?

Accepted Answer

C. The enantiomers readily interconvert in vivo, making their separation for clinical use impractical. — While one enantiomer (R-thalidomide) was initially thought to be responsible for the sedative effect and the other (S-thalidomide) for teratogenicity, it's crucial that these enantiomers rapidly interconvert in vivo under physiological conditions. This interconversion means that even if a single enantiomer were administered, both forms would be present in the body, making it impossible to avoid the teratogenic effects by administering only one isomer.

Answer

A. Both enantiomers are equally potent and have similar therapeutic and toxic effects.

Answer

B. One enantiomer is therapeutically active, while the other is responsible for the teratogenic effects.

Answer

D. The therapeutic effect is solely due to the R-enantiomer, and the S-enantiomer is inactive.

Question 7

Smallest 3-digit prime:

Accepted Answer

101 — 101.

Answer

103

Answer

107

Answer

109

Question 8

A newborn infant receives antibodies from its mother through breast milk. This type of immunity is best described as:

Accepted Answer

C. Naturally acquired passive immunity. — Naturally acquired passive immunity occurs when antibodies are transferred from one individual to another without stimulating an immune response in the recipient, such as a mother passing antibodies to her child through breast milk or across the placenta. Active immunity involves the individual's own immune system producing antibodies.

Answer

A. Naturally acquired active immunity.

Answer

B. Artificially acquired active immunity.

Answer

D. Artificially acquired passive immunity.

Question 9

Which blood cells have no nucleus?‌​‍

Accepted Answer

RBC — Mature RBCs (Red Blood Cells) have no nucleus — they lose it during development to carry more haemoglobin.‌​‍

Answer

WBC

Answer

Platelets

Answer

All have nucleus

Question 10

Thyroid gland location:

Accepted Answer

Neck — Front of neck.

Answer

Chest

Answer

Kidney

Answer

Brain

Plus 2 Lecturer Mixed Practice Test #738