LGS Mixed Practice Test #854

Question 1

In the context of nuclear fission reactors, what is the primary purpose of a moderator like heavy water (D2O) in a thermal reactor?

Accepted Answer

B. To slow down fast neutrons to thermal energies for sustained fission reactions — A moderator slows down fast neutrons (with energies ~1 MeV) emitted during fission to thermal energies (~0.025 eV), which increases the probability of further fission reactions in U-235. Option A describes a control rod's function, C is incorrect as thermal energy conversion is handled by heat exchangers/turbines, and D refers to shielding materials like lead or concrete.

Answer

A. To absorb excess neutrons and prevent chain reactions from escalating

Answer

C. To convert thermal energy directly into electrical energy via thermionic emission

Answer

D. To shield the reactor core from gamma radiation emitted during fission

Question 2

Which of the following is a common adverse effect associated with benzodiazepine use, particularly in elderly patients, and can lead to serious injuries?

Accepted Answer

C. Falls due to sedation and impaired coordination — Benzodiazepines cause central nervous system depression, leading to sedation, dizziness, and impaired motor coordination. In elderly patients, these effects significantly increase the risk of falls and subsequent injuries such as fractures. While insomnia can be a rebound effect upon withdrawal, benzodiazepines are typically used to treat insomnia. Tremors and diarrhea are not common primary adverse effects of benzodiazepines.

Answer

A. Tremors

Answer

B. Insomnia

Answer

D. Diarrhea

Question 3

Mathrubhumi founder K.P. Kesava Menon was:‌​‍

Accepted Answer

Freedom fighter — Freedom fighter and journalist.‌​‍

Answer

Actor

Answer

Politician

Answer

Saint

Question 4

Which Kerala social reformer is popularly known as a 'saint without saffron and kamandalu'?

Accepted Answer

Sree Narayana Guru — Sree Narayana Guru was called a 'saint without saffron and kamandalu' for rejecting such external trappings.

Answer

Chattampi Swamikal

Answer

Ayya Swamikal

Answer

Vagbhatananda Swamikal

Question 5

Heart has chambers:‌​‍

Accepted Answer

4 — 4 chambers — 2 atria + 2 ventricles.‌​‍

Answer

5

Answer

3

Answer

2

Question 6

A walks 5 km North, turns right, walks 3 km. He is facing:‌​‍

Accepted Answer

East — North → turn right = facing East.‌​‍

Answer

North

Answer

South

Answer

West

Question 7

A patient undergoing a 12-hour fasting period before surgery requires energy. Which of the following is the primary immediate source of glucose for the body during the initial hours of fasting?

Accepted Answer

B. Liver glycogen stores — During the initial hours of fasting, the liver breaks down its stored glycogen (glycogenolysis) to release glucose into the bloodstream, maintaining blood sugar levels. Free fatty acids become a major energy source later, and muscle protein breakdown occurs during prolonged starvation. Adipose tissue triglycerides are broken down into fatty acids and glycerol, with glycerol being a substrate for gluconeogenesis, but liver glycogen is the immediate primary source of glucose.

Answer

A. Muscle protein breakdown

Answer

C. Free fatty acids

Answer

D. Adipose tissue triglycerides

Question 8

Which of the following are the components of prejudice?‌​‍

Accepted Answer

Cognitive (stereotype) + Affective (prejudice) + Behavioral (discrimination) — Stereotype = belief. ‌​‍Prejudice = attitude. Discrimination = behavior. ‌​‍Contact hypothesis reduces prejudice (Allport).

Answer

None

Answer

Only action

Answer

Only belief

Question 9

Sedimentary rock example:‌​‍

Accepted Answer

Sandstone, shale, limestone — Deposition, compaction, cementation. ‌​‍Often layered. Contain fossils. ‌​‍Coal, oil found in sedimentary.

Answer

Granite

Answer

Marble

Answer

Gneiss

Question 10

Federal structure was borrowed from:‌​‍

Accepted Answer

Canada — The idea of a federation with a strong centre was borrowed from Canada.‌​‍

Answer

USA

Answer

Australia

Answer

Switzerland

LGS Mixed Practice Test #854