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: Gas needed for fire to burn
A) Oxygen
B) Helium
C) Carbon dioxide
D) Nitrogen
✅ Correct Answer: A
Explanation: Oxygen supports combustion, making it essential for fire to burn.
Q: Smallest unit of an element
A) Molecule
B) Atom
C) Proton
D) Cell
✅ Correct Answer: B
Explanation: Atom is the smallest unit that retains the chemical properties of an element.
Q: Function of white blood cells
A) Aid digestion
B) Fight infections
C) Carry nutrients
D) Transport oxygen
✅ Correct Answer: B
Explanation: White blood cells defend the body against pathogens and disease.
Q: Part of eye controlling light entry
A) Retina
B) Iris
C) Cornea
D) Lens
✅ Correct Answer: B
Explanation: The iris regulates the size of the pupil to control the amount of light entering.
Q: Metal used in thermometers
A) Mercury
B) Iron
C) Copper
D) Silver
✅ Correct Answer: A
Explanation: Mercury is used in traditional thermometers due to its uniform expansion.