Practice <strong>Railway RRB NTPC, Group D, ALP, Junior Engineer, Technician</strong> MCQs covering Mathematics, General Intelligence & Reasoning, General Science, and General Awareness. Aligned with the latest RRB exam syllabus.
The SI unit of electrical resistance is Ohm (Ω), named after Georg Simon Ohm.
Q.22Easy
At what temperature does water boil at standard atmospheric pressure?
Answer: B
Water boils at 100°C (373.15 K) at standard atmospheric pressure of 1 atm.
Q.23Easy
Which gas is essential for respiration in humans?
Answer: C
Oxygen is essential for aerobic respiration in humans. It is used by mitochondria to produce ATP.
Q.24Easy
What is the chemical formula of table salt?
Answer: B
Table salt is sodium chloride (NaCl), composed of sodium and chlorine ions.
Q.25Easy
Which organ in the human body is responsible for filtering blood and producing urine?
Answer: C
Kidneys filter waste products from the blood to produce urine. Each person typically has two kidneys.
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Q.26Easy
What is the acceleration due to gravity on Earth's surface?
Answer: B
The standard acceleration due to gravity at Earth's surface is approximately 9.8 m/s² or 10 m/s² for approximations.
Q.27Medium
Which of the following is a scalar quantity?
Answer: C
Distance is a scalar quantity as it has only magnitude. Velocity, acceleration, and displacement are vectors as they have both magnitude and direction.
Q.28Medium
What is the process by which plants make their own food using sunlight?
Answer: B
Photosynthesis is the process where plants convert sunlight, water, and carbon dioxide into glucose and oxygen.
Q.29Medium
Which metal is liquid at room temperature?
Answer: B
Mercury is the only metal that remains liquid at room temperature (25°C). Its melting point is -38.8°C.
Q.30Medium
What is the speed of light in vacuum?
Answer: B
The speed of light in vacuum is approximately 3 × 10⁸ m/s or 299,792,458 m/s to be precise.
Q.31Medium
Which of the following vitamins helps in calcium absorption?
Answer: C
Vitamin D helps in the absorption of calcium from the intestines, essential for bone health and development.
Q.32Medium
What is the process by which solids directly convert to gases without becoming liquids?
Answer: C
Sublimation is the process where a solid directly converts to a gas. Dry ice (solid CO₂) is a common example.
Q.33Medium
Which blood group is considered a universal donor?
Answer: C
O- blood type is the universal donor as it lacks A, B, and Rh antigens on red blood cells.
Q.34Medium
What is the chemical formula for sulfuric acid?
Answer: B
Sulfuric acid is H₂SO₄, one of the most important industrial chemicals with numerous applications.
Q.35Medium
In the context of Newton's Laws of Motion, which law states that action and reaction are equal and opposite?
Answer: C
Newton's Third Law states that for every action, there is an equal and opposite reaction.
Q.36Hard
Which of the following is an example of a heterogeneous mixture?
Answer: C
Sand and iron filings form a heterogeneous mixture as their components remain visibly distinct and can be easily separated.
Q.37Hard
What is the Doppler effect primarily related to?
Answer: B
The Doppler effect describes the change in frequency or wavelength of waves when the source or observer moves relative to each other.
Q.38Hard
Which type of lens is used to correct myopia (short-sightedness)?
Answer: B
Concave lenses are used to correct myopia by diverging light rays to focus them correctly on the retina.
Q.39Hard
Which of the following statements about entropy is correct?
Answer: B
According to the Second Law of Thermodynamics, entropy (disorder) of an isolated system always increases over time.
Q.40Easy
Which gas is primarily responsible for the greenhouse effect?
Answer: B
Carbon dioxide (CO₂) is the primary greenhouse gas responsible for global warming. It traps heat in the atmosphere.
