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: Substance responsible for rusting of iron
A) Both A and B
B) Carbon dioxide
C) Water
D) Oxygen
✅ Correct Answer: A
Explanation: Rusting occurs due to the reaction of iron with oxygen and water.
Q: Liquid metal used in thermometers
A) Copper
B) Mercury
C) Silver
D) Lead
✅ Correct Answer: B
Explanation: Mercury remains in liquid form at room temperature and expands with heat.
Q: Device used to see tiny objects
A) Microscope
B) Telescope
C) Periscope
D) Binoculars
✅ Correct Answer: A
Explanation: A microscope magnifies small objects invisible to the naked eye.
Q: Human eye is sensitive to
A) X-rays
B) Ultraviolet
C) Visible light
D) Infrared
✅ Correct Answer: C
Explanation: Visible light is the range of electromagnetic radiation detected by the human eye.
Q: Earth completes one rotation in
A) 12 hours
B) 24 hours
C) 48 hours
D) 36 hours
✅ Correct Answer: B
Explanation: One complete rotation of Earth takes 24 hours, resulting in day and night.
Q: Instrument used to detect earthquakes
A) Speedometer
B) Seismograph
C) Barometer
D) Thermometer
✅ Correct Answer: B
Explanation: A seismograph records seismic waves produced by earthquakes.
Q: Common salt’s chemical formula
A) CaCl₂
B) NaCl
C) NaCO₃
D) KCl
✅ Correct Answer: B
Explanation: NaCl represents sodium chloride, commonly known as table salt.
Q: Plant tissue responsible for food transport
A) Epidermis
B) Phloem
C) Cambium
D) Xylem
✅ Correct Answer: B
Explanation: Phloem distributes the food made during photosynthesis to plant parts.
Q: Smallest bone in human body
A) Stapes
B) Femur
C) Tibia
D) Radius
✅ Correct Answer: A
Explanation: The stapes bone in the middle ear is the smallest bone in the human body.
Q: Total number of teeth in adult humans
A) 30
B) 36
C) 28
D) 32
✅ Correct Answer: D
Explanation: Adult humans typically have 32 permanent teeth.