KAS Prelims Mixed Practice Test #464

Question 1

Total CA sessions to complete Constitution:‌​‍

Accepted Answer

11 — 11 sessions.‌​‍

Answer

15

Answer

22

Answer

8

Question 2

Merryland Studios:‌​‍

Accepted Answer

TVM — TVM — Subramanyam Studios.‌​‍

Answer

Ernakulam

Answer

Thrissur

Answer

Alappuzha

Question 3

Group age mean 30. If one aged 60 leaves, new mean of 4 is 22.5. Total group was:

Accepted Answer

5 — Solve: original sum 30n. New sum 30n-60=22.5×4=90. 30n=150. n=5.

Answer

6

Answer

4

Answer

3

Question 4

Chilika Lake (Odisha):‌​‍

Accepted Answer

Largest brackish water in India — Largest coastal lagoon.‌​‍

Answer

Salt

Answer

Glacial

Answer

Fresh

Question 5

Serotonin role:‌​‍

Accepted Answer

Mood, digestion — Mood regulation, gut.‌​‍

Answer

Only mood

Answer

None

Answer

Only digestion

Question 6

Chain reaction in U-235 occurs because each fission produces:‌​‍

Accepted Answer

~2-3 neutrons (some cause further fissions) — Critical mass needed to sustain chain. ‌​‍Moderator slows neutrons to increase fission probability.

Answer

10 neutrons

Answer

0 neutrons

Answer

1 neutron

Question 7

Cardiac glycosides like Digoxin are known for their positive inotropic effect, which increases the force of myocardial contraction. This effect primarily involves:

Accepted Answer

B. Inhibiting the Na+/K+-ATPase pump. — Cardiac glycosides inhibit the Na+/K+-ATPase pump in cardiac muscle cells, leading to increased intracellular sodium. This in turn reduces the activity of the Na+/Ca2+ exchanger, resulting in increased intracellular calcium, which enhances myocardial contractility.

Answer

A. Blocking beta-adrenergic receptors.

Answer

C. Increasing cyclic AMP levels.

Answer

D. Dilating peripheral blood vessels.

Question 8

Plasma percentage in blood:

Accepted Answer

55% — About 55% is plasma.

Answer

40%

Answer

70%

Answer

90%

Question 9

Internet users India (approx):‌​‍

Accepted Answer

850+ million — ~850M users.‌​‍

Answer

500M

Answer

1 billion+

Answer

2 billion

Question 10

PCR (Polymerase Chain Reaction) is used for:

Accepted Answer

DNA amplification in vitro — Kary Mullis (Nobel 1993). Uses Taq polymerase (heat-stable). Denaturation 94°C, annealing 55°C, extension 72°C.

Answer

Protein synthesis

Answer

DNA degradation

Answer

Only sequencing

KAS Prelims Mixed Practice Test #464