Prepare effectively for Assam government competitive exams like APSC, ADRE, TET, B.Ed , and various other recruitment tests with the Top 50 Basic Science MCQs. This comprehensive collection covers Assam’s history all updated and curated to boost your exam success
1. The unit of electric current is:
Answer: c) Ampere
Explanation: The ampere (A) is the SI unit of electric current.
2. Which law explains the relationship between pressure and volume of a gas
at constant temperature?
Answer: a) Boyle’s Law
Explanation: Boyle’s Law states that pressure of a given mass of gas is
inversely proportional to its volume when temperature is kept constant.
3. The speed of light in vacuum is approximately:
Answer: b) 3 × 10⁸ m/s
Explanation: Light travels at ~299,792,458 m/s in vacuum, often approximated
as 3 × 10⁸ m/s.
4. Which type of mirror is used in vehicle headlights?
Answer: b) Concave mirror
Explanation: Concave mirrors focus light into a beam, making them ideal for
vehicle headlights.
5. Which phenomenon is responsible for the blue color of the sky?
Answer: c) Scattering of light
Explanation: Rayleigh scattering causes shorter (blue) wavelengths to
scatter more in the atmosphere.
6. The device used to measure atmospheric pressure is:
Answer: c) Barometer
Explanation: Barometers, like mercury or aneroid types, measure atmospheric
pressure.
7. Which scientist first explained the law of gravitation?
Answer: b) Newton
Explanation: Isaac Newton formulated the universal law of gravitation in the
17th century.
8. What is the main source of energy in the Sun?
Answer: b) Nuclear fusion
Explanation: Hydrogen nuclei fuse to form helium, releasing energy in the
Sun's core.
9. In which medium does sound travel fastest?
Answer: c) Steel
Explanation: Sound velocity is highest in solids like steel due to closely
packed particles.
10. The S.I. unit of force is:
Answer: c) Newton
Explanation: One Newton is the force that gives a 1 kg mass an acceleration
of 1 m/s².
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