Science MCQs
Science MCQs cover physics, chemistry, and biology basics, ideal for SSC, HSSC, and job exams. They enhance understanding of scientific concepts, laws, anatomy, and problem-solving skills essential for competitive and academic success.
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.