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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 191–200 of 208
Topics in Railway RRB / NTPC
Q.191 Medium General Science
Which organ in the human body produces insulin?
A Liver
B Pancreas
C Kidney
D Stomach
Correct Answer:  B. Pancreas
EXPLANATION

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

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Q.192 Medium General Science
In the context of Newton's Laws of Motion, which law states that action and reaction are equal and opposite?
A First Law
B Second Law
C Third Law
D Fourth Law
Correct Answer:  C. Third Law
EXPLANATION

Newton's Third Law states that for every action, there is an equal and opposite reaction.

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Q.193 Medium General Science
What is the chemical formula for sulfuric acid?
A H₂SO₃
B H₂SO₄
C HSO₄
D H₃SO₄
Correct Answer:  B. H₂SO₄
EXPLANATION

Sulfuric acid is H₂SO₄, one of the most important industrial chemicals with numerous applications.

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Q.194 Medium General Science
Which blood group is considered a universal donor?
A AB+
B O+
C O-
D B-
Correct Answer:  C. O-
EXPLANATION

O- blood type is the universal donor as it lacks A, B, and Rh antigens on red blood cells.

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Q.195 Medium General Science
What is the process by which solids directly convert to gases without becoming liquids?
A Melting
B Evaporation
C Sublimation
D Condensation
Correct Answer:  C. Sublimation
EXPLANATION

Sublimation is the process where a solid directly converts to a gas. Dry ice (solid CO₂) is a common example.

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Q.196 Medium General Science
Which of the following vitamins helps in calcium absorption?
A Vitamin A
B Vitamin B
C Vitamin D
D Vitamin E
Correct Answer:  C. Vitamin D
EXPLANATION

Vitamin D helps in the absorption of calcium from the intestines, essential for bone health and development.

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Q.197 Medium General Science
What is the speed of light in vacuum?
A 2 × 10⁸ m/s
B 3 × 10⁸ m/s
C 4 × 10⁸ m/s
D 5 × 10⁸ m/s
Correct Answer:  B. 3 × 10⁸ m/s
EXPLANATION

The speed of light in vacuum is approximately 3 × 10⁸ m/s or 299,792,458 m/s to be precise.

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Q.198 Medium General Science
Which metal is liquid at room temperature?
A Iron
B Mercury
C Aluminum
D Copper
Correct Answer:  B. Mercury
EXPLANATION

Mercury is the only metal that remains liquid at room temperature (25°C). Its melting point is -38.8°C.

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Q.199 Medium General Science
What is the process by which plants make their own food using sunlight?
A Respiration
B Photosynthesis
C Fermentation
D Decomposition
Correct Answer:  B. Photosynthesis
EXPLANATION

Photosynthesis is the process where plants convert sunlight, water, and carbon dioxide into glucose and oxygen.

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Q.200 Medium General Science
Which of the following is a scalar quantity?
A Velocity
B Acceleration
C Distance
D Displacement
Correct Answer:  C. Distance
EXPLANATION

Distance is a scalar quantity as it has only magnitude. Velocity, acceleration, and displacement are vectors as they have both magnitude and direction.

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