Govt Exam — Railway RRB / NTPC
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Showing 31–40 of 208 questions
Q.31 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.32 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.33 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.34 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.35 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.36 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.37 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.38 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.39 Medium General Science
Which of the following best describes the process of photosynthesis?
A Breakdown of glucose to produce energy and CO₂
B Conversion of light energy into chemical energy using CO₂ and water
C Production of glucose without involving chlorophyll
D Release of oxygen as a waste product only
Correct Answer:  B. Conversion of light energy into chemical energy using CO₂ and water
Explanation:

Photosynthesis is the process by which plants convert light energy into chemical energy in the form of glucose, using carbon dioxide and water. The overall equation is 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.

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Q.40 Medium General Science
Which of the following is an endothermic reaction?
A Combustion of fuel
B Melting of ice
C Condensation of water vapor
D Rusting of iron
Correct Answer:  B. Melting of ice
Explanation:

Melting of ice is an endothermic reaction as it requires absorption of heat energy. Combustion and rusting are exothermic reactions that release heat; condensation is also exothermic.

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