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: 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.
Q: Natural source of Vitamin D
A) Fruits
B) Sunlight
C) Fish
D) Milk
✅ Correct Answer: B
Explanation: Sunlight helps the body synthesize Vitamin D through the skin.
Q: Instrument measuring air pressure
A) Thermometer
B) Altimeter
C) Barometer
D) Anemometer
✅ Correct Answer: C
Explanation: A barometer is used to measure atmospheric pressure.
Q: Human body’s largest internal organ
A) Lung
B) Heart
C) Liver
D) Stomach
✅ Correct Answer: C
Explanation: The liver is the largest internal organ and performs various metabolic functions.
Q: Blood component carrying oxygen
A) Red cells
B) White cells
C) Platelets
D) Plasma
✅ Correct Answer: A
Explanation: Red blood cells contain hemoglobin which carries oxygen.
Q: Layer protecting Earth from UV rays
A) Troposphere
B) Ozone layer
C) Stratosphere
D) Exosphere
✅ Correct Answer: B
Explanation: The ozone layer absorbs and blocks harmful ultraviolet radiation from the Sun.