Science MCQs
Science MCQs offer a general overview of multiple scientific disciplines such as physics, chemistry, and biology. These questions are ideal for students, job seekers, and competitive exam candidates looking to enhance their scientific knowledge. Whether you're preparing for SSC, HSSC, or general job tests, these MCQs provide a mix of theoretical and practical science questions. This category is particularly useful for testing concepts related to laws of motion, periodic table, cell structure, human anatomy, electricity, and more. The MCQs are curated to support concept building and revision. They also help in developing problem-solving abilities and logical analysis skills, which are crucial in science-based exams.
Q: Boiling point of pure water at sea level is
A) 100°C
B) 120°C
C) 90°C
D) 80°C
✅ Correct Answer: A
Explanation: Boiling point of water at sea level is 100°C due to standard atmospheric pressure.
Q: Planet known as the Red Planet
A) Venus
B) Saturn
C) Mars
D) Jupiter
✅ Correct Answer: C
Explanation: Mars is called the Red Planet because of its reddish surface due to iron oxide.
Q: Largest organ in the human body
A) Liver
B) Heart
C) Skin
D) Brain
✅ Correct Answer: C
Explanation: Skin is the largest organ, providing a protective outer layer for the body.
Q: Chemical symbol for Sodium
A) S
B) So
C) Na
D) Sn
✅ Correct Answer: C
Explanation: The symbol 'Na' is derived from the Latin word 'Natrium' for Sodium.
Q: Basic unit of heredity
A) Chromosome
B) DNA
C) Nucleus
D) Gene
✅ Correct Answer: D
Explanation: Gene is the hereditary unit located on chromosomes.
Q: Speed of light in vacuum
A) 150,000 km/s
B) 450,000 km/s
C) 300,000 km/s
D) 600,000 km/s
✅ Correct Answer: C
Explanation: Speed of light in vacuum is nearly 300,000 kilometers per second.
Q: Human blood is composed of plasma and
A) Cells
B) Lymph
C) Cartilage
D) Bone
✅ Correct Answer: A
Explanation: Blood consists of red and white blood cells and platelets in plasma.
Q: Instrument used to measure temperature
A) Anemometer
B) Altimeter
C) Thermometer
D) Barometer
✅ Correct Answer: C
Explanation: Thermometers are used to measure body and environmental temperatures.
Q: Primary gas found in Earth's atmosphere
A) Carbon dioxide
B) Hydrogen
C) Oxygen
D) Nitrogen
✅ Correct Answer: D
Explanation: Nitrogen forms approximately 78% of Earth’s atmosphere.
Q: Newton’s third law deals with
A) Acceleration
B) Gravity
C) Inertia
D) Action and reaction
✅ Correct Answer: D
Explanation: Newton’s third law states every action has an equal and opposite reaction.