Home Subjects Railway RRB / NTPC General Science

Railway RRB / NTPC
General Science

NTPC, Group D, JE — all sections

48 Q 5 Topics Take Mock Test
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Difficulty: All Easy Medium Hard 11–20 of 48
Topics in Railway RRB / NTPC
Q.11 Medium General Science
Which gland produces insulin in the human body?
A Thyroid gland
B Pancreas
C Pituitary gland
D Adrenal gland
Correct Answer:  B. Pancreas
EXPLANATION

The pancreas produces insulin, a hormone that regulates blood glucose levels. Beta cells in the pancreas secrete insulin.

Test
Q.12 Medium General Science
What is the process of conversion of iron into rust primarily called?
A Reduction
B Oxidation
C Corrosion
D All of the above
Correct Answer:  C. Corrosion
EXPLANATION

Corrosion is the process of rust formation. Iron oxidation in the presence of moisture and oxygen leads to rust (Fe2O3).

Test
Q.13 Medium General Science
Which planet in our solar system has the most moons?
A Saturn
B Jupiter
C Uranus
D Neptune
Correct Answer:  B. Jupiter
EXPLANATION

Jupiter has 95 confirmed moons (as of 2024), making it the planet with the most moons in our solar system.

Test
Q.14 Medium General Science
What is the SI unit of electrical current?
A Volt
B Ohm
C Ampere
D Watt
Correct Answer:  C. Ampere
EXPLANATION

The Ampere (A) is the SI unit of electrical current, named after physicist André-Marie Ampère.

Test
Q.15 Medium General Science
Which disease is caused by iodine deficiency?
A Scurvy
B Goiter
C Anemia
D Rickets
Correct Answer:  B. Goiter
EXPLANATION

Goiter is caused by insufficient iodine in the diet, leading to thyroid gland enlargement. Iodine is essential for thyroid hormone production.

Test
Q.16 Medium General Science
What is the percentage of oxygen in the Earth's atmosphere?
A 15%
B 21%
C 31%
D 42%
Correct Answer:  B. 21%
EXPLANATION

Oxygen comprises approximately 21% of Earth's atmosphere. Nitrogen makes up about 78%, with other gases comprising the remainder.

Test
Q.17 Medium General Science
Which of the following is an example of a conductor?
A Rubber
B Copper
C Glass
D Plastic
Correct Answer:  B. Copper
EXPLANATION

Copper is an excellent electrical conductor that allows electricity to flow through it easily. Rubber, glass, and plastic are insulators.

Test
Q.18 Medium General Science
Which of the following diseases is caused by a deficiency of Vitamin C?
A Beriberi
B Scurvy
C Rickets
D Pellagra
Correct Answer:  B. Scurvy
EXPLANATION

Scurvy is caused by vitamin C deficiency, leading to weak connective tissue and poor wound healing.

Test
Q.19 Medium General Science
What is the process by which a liquid changes into a solid?
A Condensation
B Freezing
C Sublimation
D Deposition
Correct Answer:  B. Freezing
EXPLANATION

Freezing is the phase change from liquid to solid, typically occurring at the freezing point of a substance.

Test
Q.20 Medium General Science
Which blood cell is responsible for carrying oxygen throughout the body?
A White blood cells
B Red blood cells
C Platelets
D Lymphocytes
Correct Answer:  B. Red blood cells
EXPLANATION

Red blood cells (erythrocytes) contain hemoglobin and transport oxygen from lungs to body tissues.

Test
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