KAS Prelims Mixed Practice Test #1059

Question 1

Which of these is a noble gas?‌​‍

Accepted Answer

Helium — Noble gases: He, Ne, Ar, Kr, Xe, Rn — inert Group 18 elements.‌​‍

Answer

Hydrogen

Answer

Oxygen

Answer

Nitrogen

Question 2

The minimum age to contest for the Rajya Sabha is:‌​‍

Accepted Answer

30 — Rajya Sabha age: 30 years minimum.‌​‍

Answer

25

Answer

21

Answer

35

Question 3

For uniform acceleration, relation v² = u² + 2as assumes:‌​‍

Accepted Answer

Constant a along straight line — Third equation of kinematics under constant acceleration on a straight path.‌​‍

Answer

Circular motion

Answer

Only free fall

Answer

Variable a

Question 4

The greenhouse gas with the highest contribution to global warming is:‌​‍

Accepted Answer

Carbon dioxide — CO₂ is the largest contributor to anthropogenic greenhouse effect by volume.‌​‍

Answer

Methane

Answer

CFCs

Answer

Nitrous oxide

Question 5

In a Pressurized Water Reactor (PWR), which of the following statements accurately describes the primary function of the control rods and the moderator material?

Accepted Answer

B. Control rods absorb excess thermal neutrons to regulate the chain reaction, while the moderator slows down fast neutrons to thermal energies. — Control rods, typically made of neutron-absorbing materials like cadmium or boron, are used to absorb excess thermal neutrons, thereby regulating the rate of the nuclear chain reaction. The moderator material, such as heavy water or graphite, slows down the high-energy (fast) neutrons released during fission to lower (thermal) energies, increasing the probability of them being absorbed by fissile nuclei and sustaining the chain reaction.

Answer

A. Control rods absorb fast neutrons to slow them down, while the moderator absorbs excess thermal neutrons.

Answer

C. Control rods reflect neutrons back into the core, while the moderator removes fission products.

Answer

D. Control rods increase the rate of fission, while the moderator cools the reactor core.

Question 6

Hindi Divas:‌​‍

Accepted Answer

14 Sep — 14 September (Hindi adopted as official language, 1949).‌​‍

Answer

26 Jan

Answer

15 Aug

Answer

2 Oct

Question 7

Beats frequency between two waves of frequencies 256 Hz and 260 Hz is:‌​‍

Accepted Answer

4 Hz — Beat frequency = |f1 - f2| = 4 Hz. Audible if beats <~10 Hz.‌​‍

Answer

2 Hz

Answer

0

Answer

516 Hz

Question 8

Incomplete dominance is shown in:‌​‍

Accepted Answer

Mirabilis jalapa (4 o'clock) — pink F1 — Red × white → pink. ‌​‍F2: 1:2:1 (red:pink:white). Co-dominance: ABO blood group (both A and B expressed).

Answer

Mendel's pea

Answer

Human blood

Answer

Drosophila eye

Question 9

Takshashila (Taxila) in:‌​‍

Accepted Answer

Gandhara (Pakistan) — Ancient centre of learning.‌​‍

Answer

Bihar

Answer

UP

Answer

Tamil Nadu

Question 10

Gabriel García Márquez's magic realism masterpiece:‌​‍

Accepted Answer

One Hundred Years of Solitude — Colombian. ‌​‍Nobel 1982. Buendía family, Macondo town. ‌​‍Defined Latin American Boom.

Answer

Ulysses

Answer

1984

Answer

Don Quixote

KAS Prelims Mixed Practice Test #1059