Question 1

A soldier requires approximately how many calories per day to maintain optimal physical fitness for military operations?

Accepted Answer

Active military personnel engaged in regular training and field operations require 2500–3500 calories daily to maintain strength, endurance, and combat readiness.

Question 2

Which of the following gases is primarily responsible for the depletion of the ozone layer in Earth's atmosphere?

Accepted Answer

CFCs release chlorine atoms in the stratosphere that catalytically destroy ozone molecules, causing the ozone hole.

Question 3

Which of the following diseases is primarily caused by the deficiency of Vitamin C in the diet?

Accepted Answer

Scurvy is caused by prolonged deficiency of Vitamin C, which was historically common among soldiers and sailors on long expeditions due to lack of fresh fruits and vegetables.

Question 4

Army ammunition depots store explosives in controlled environments. Gunpowder, a mixture of potassium nitrate, charcoal, and sulphur, undergoes rapid oxidation-reduction during combustion. What type of chemical reaction is this?

Accepted Answer

Gunpowder combustion is a redox reaction where sulphur and charcoal are oxidised by potassium nitrate, releasing energy rapidly.

Question 5

Which mineral deficiency causes goitre, a condition that can impair physical performance and is of concern in military recruitment?

Accepted Answer

Iodine deficiency leads to goitre (thyroid enlargement), which affects metabolism, energy levels, and cognitive function—critical factors in military fitness assessment.

Question 6

Which launch vehicle is primarily used by ISRO to place satellites into Geosynchronous Orbit (GEO)?

Accepted Answer

GSLV is specifically designed to launch satellites into Geosynchronous Orbits, while PSLV is used for polar orbits.

Question 7

During field operations, soldiers use water purification tablets containing chlorine compounds. Which of the following is the primary reason chlorine is effective in killing bacteria and pathogens in drinking water?

Accepted Answer

Chlorine is a strong oxidizing agent that disrupts microbial cell structures, making it an effective disinfectant for water purification in field conditions.

Question 8

Which organ in the human body is responsible for filtering blood and producing urine?

Accepted Answer

The kidneys filter waste products and excess water from the blood to form urine, which is essential for maintaining the body's water and electrolyte balance.

Question 9

Which of the following is the primary purpose of the Akash missile system used by the Indian Army?

Accepted Answer

The Akash is a surface-to-air missile system designed for air defence to neutralize hostile aircraft, helicopters, and incoming missiles.

Question 10

A soldier's water bottle feels cold to the touch when filled with ice water. The cold sensation occurs because heat flows from the soldier's hand to the ice water. Which mode of heat transfer is primarily responsible?

Accepted Answer

Heat transfer between the warm hand and cold bottle occurs through conduction, which is the direct transfer of thermal energy through physical contact between two objects.

Question 11

When a soldier aims a rifle at a target, the bullet follows a curved path downward after leaving the barrel. Which physics concept explains this curved motion?

Accepted Answer

A bullet fired horizontally experiences constant downward acceleration due to gravity (9.8 m/s²), creating a parabolic trajectory regardless of initial velocity.

Question 12

The Arjun Main Battle Tank (MBT) is primarily used by which branch of the Indian Armed Forces?

Accepted Answer

The Arjun MBT is the main battle tank of the Indian Army designed for armoured warfare and ground combat operations.

Question 13

Which Indian space agency is responsible for India's space programme and satellite launches?

Accepted Answer

ISRO is India's primary space agency that designs, develops, and launches satellites and space missions.

Question 14

What is the name of India's first lunar mission launched by ISRO in 2008?

Accepted Answer

Chandrayaan-1 was India's first lunar orbiter mission, successfully launched in 2008 and orbited the Moon.

Question 15

What is the maximum range of the BrahMos cruise missile, one of India's most advanced defence systems?

Accepted Answer

BrahMos is a supersonic cruise missile with a range of approximately 290 km, jointly developed by India and Russia.

Question 16

Soldiers deployed in high-altitude regions experience altitude sickness due to lower oxygen partial pressure. At sea level, the concentration of oxygen in air is approximately 21% by volume. What is this percentage called in chemistry?

Accepted Answer

Volume percentages of gases in mixtures like air are expressed as mole fractions or mole percentages, since at constant temperature and pressure, volume is proportional to moles.

Question 17

What is the normal resting heart rate range for a healthy adult human?

Accepted Answer

A healthy adult at rest typically has a heart rate between 60 and 100 beats per minute; athletes may have lower rates due to cardiovascular conditioning.

Question 18

How many bones are present in the adult human skeleton?

Accepted Answer

An adult human skeleton contains 206 bones; infants are born with approximately 270 bones, many of which are cartilage that fuse into 206 bones by adulthood.

Question 19

An army vehicle moving at 20 m/s suddenly applies brakes and comes to rest in 5 seconds. What is the magnitude of deceleration experienced by the vehicle?

Accepted Answer

Using the equation a = (v - u)/t, where v = 0 m/s, u = 20 m/s, and t = 5 s gives a = -20/5 = -4 m/s² (magnitude = 4 m/s²).

Question 20

In the context of ecosystem management, which of the following represents a biotic component of an environment?

Accepted Answer

Biotic components are all living organisms in an ecosystem, while abiotic components are non-living physical factors.

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