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Railway RRB / NTPC

NTPC, Group D, JE — all sections

132 Q 5 Topics Take Mock Test
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Difficulty: All Easy Medium Hard 111–120 of 132
Topics in Railway RRB / NTPC
Q.111 Easy General Science
Which hormone regulates blood sugar levels in the human body?
A Adrenaline
B Thyroxine
C Insulin
D Cortisol
Correct Answer:  C. Insulin
EXPLANATION

Insulin, produced by the pancreas, regulates blood glucose levels by promoting glucose uptake and storage.

Test
Q.112 Easy General Science
What is the speed of light in vacuum (approximately)?
A 3 × 10^8 m/s
B 3 × 10^6 m/s
C 3 × 10^10 m/s
D 3 × 10^5 m/s
Correct Answer:  A. 3 × 10^8 m/s
EXPLANATION

The speed of light in vacuum is approximately 3 × 10^8 meters per second or 300,000 km/s.

Test
Q.113 Easy General Science
Which of the following is the hardest naturally occurring substance on Earth?
A Graphite
B Diamond
C Quartz
D Feldspar
Correct Answer:  B. Diamond
EXPLANATION

Diamond is the hardest naturally occurring substance, rating 10 on the Mohs hardness scale.

Test
Q.114 Easy General Science
Which of the following is a non-renewable energy source?
A Solar energy
B Wind energy
C Coal
D Hydroelectric energy
Correct Answer:  C. Coal
EXPLANATION

Coal is a fossil fuel and non-renewable energy source. Solar, wind, and hydroelectric are renewable sources.

Test
Q.115 Easy General Science
What is the boiling point of water at standard atmospheric pressure?
A 90°C
B 100°C
C 110°C
D 80°C
Correct Answer:  B. 100°C
EXPLANATION

Water boils at 100°C (212°F) at standard atmospheric pressure of 1 atm or 101.325 kPa.

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Q.116 Easy General Science
Which element has the atomic number 6?
A Oxygen
B Nitrogen
C Carbon
D Helium
Correct Answer:  C. Carbon
EXPLANATION

Carbon has atomic number 6, meaning it has 6 protons in its nucleus. It is the basis of all organic compounds.

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Q.117 Easy General Science
Which vitamin is produced by the skin when exposed to sunlight?
A Vitamin A
B Vitamin B
C Vitamin D
D Vitamin E
Correct Answer:  C. Vitamin D
EXPLANATION

Vitamin D is synthesized in the skin upon exposure to ultraviolet (UV) radiation from sunlight.

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Q.118 Easy General Science
What is the chemical formula for table salt?
A NaCl
B KCl
C CaCl₂
D MgCl₂
Correct Answer:  A. NaCl
EXPLANATION

Table salt is sodium chloride (NaCl), composed of sodium and chlorine ions in a 1:1 ratio.

Test
Q.119 Easy General Science
Which gas is primarily responsible for the greenhouse effect?
A Nitrogen
B Carbon dioxide
C Oxygen
D Argon
Correct Answer:  B. Carbon dioxide
EXPLANATION

Carbon dioxide (CO₂) is the primary greenhouse gas responsible for global warming. It traps heat in the atmosphere.

Test
Q.120 Easy General Science
What is the acceleration due to gravity on Earth's surface?
A 8.8 m/s²
B 9.8 m/s²
C 10.8 m/s²
D 11.8 m/s²
Correct Answer:  B. 9.8 m/s²
EXPLANATION

The standard acceleration due to gravity at Earth's surface is approximately 9.8 m/s² or 10 m/s² for approximations.

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