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Railway RRB / NTPC

NTPC, Group D, JE — all sections

208 Q 5 Topics Take Test
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Difficulty: All Easy Medium Hard 171–180 of 208
Topics in Railway RRB / NTPC
Q.171 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.

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Q.172 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).

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Q.173 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.

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Q.174 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.

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Q.175 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.

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Q.176 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.

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Q.177 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.

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Q.178 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.

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Q.179 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.

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Q.180 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.

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