Here you will be provided with 60 well-researched and important physical science general knowledge questions for competitive exams. Here you will get 10 questions with detailed explanation. The rest of the 50 questions are in a PDF at the end of this article.
Physical science gk questions:
•1. What happens to the wavelength of light when it passes from air to water?•
a) Increases
b) Decreases
c) Remains the same
d) Doubles
•Answer•: b) Decreases
•Explanation•: The speed of light decreases in water that causes the wavelength to shorten while frequency remains unchanged.
•2. Which of the following phenomena proves the particle nature of light?•
a) Diffraction
b) Polarization
c) Photoelectric effect
d) Reflection
•Answer•: c) Photoelectric effect
•Explanation•: The photoelectric effect shows light’s particle nature as electrons emit when photons with enough energy hit a material.
•3. Why does an object appear red?•
a) It absorbs red light.
b) It reflects red light.
c) It absorbs all colors.
d) It reflects all colors.
•Answer•: b) It reflects red light.
•Explanation•: A red object reflects red light and absorbs all other wavelengths in the visible spectrum.
•4. What does the first law of thermodynamics state?•
a) Energy is destroyed.
b) Energy is created.
c) Energy can neither be created nor destroyed.
d) Heat is the only form of energy.
•Answer•: c) Energy can neither be created nor destroyed.
•Explanation•: The first law of thermodynamics, also called the law of energy conservation, states that energy is constant in an isolated system.
•5. What is the primary cause of tides on Earth?•
a) Wind
b) Sun’s gravity
c) Earth’s rotation
d) Moon’s gravity
•Answer•: d) Moon’s gravity
•Explanation•: The gravitational pull of the Moon on Earth’s oceans causes the rise and fall of tides.
•6. Which electromagnetic wave has the shortest wavelength?•
a) Radio waves
b) Microwaves
c) Gamma rays
d) Infrared
•Answer•: c) Gamma rays
•Explanation•: Gamma rays have the shortest wavelength and highest energy in the electromagnetic spectrum.
•7. What force is responsible for keeping planets in orbit around the Sun?•
a) Electromagnetic force
b) Gravitational force
c) Nuclear force
d) Tension force
•Answer•: b) Gravitational force
•Explanation•: Gravitational force attracts the planets toward the Sun, keeping them in stable orbits.
•8. Why does the sky appear blue?•
a) Sun emits blue light
b) Blue light is scattered least.
c) Blue light is scattered most.
d) The atmosphere absorbs blue light.
•Answer•: c) Blue light is scattered most.
•Explanation•: Shorter wavelengths like blue are scattered more by atmospheric particles, making the sky appear blue.
•9. What happens to the internal energy of a gas during compression?•
a) It decreases
b) It increases
c) It remains constant
d) It depends on the gas
•Answer•: b) It increases
•Explanation•: Compression raises the gas’s internal energy by doing work on it, which increases its temperature.
•10. Which of the following is an example of a vector quantity?•
a) Time
b) Energy
c) Velocity
d) Temperature
•Answer•: c) Velocity
•Explanation•: Velocity has both magnitude and direction, making it a vector quantity, unlike time, energy, or temperature.
Here we provide you 10 physical science gk questions with detailed explanation. To download the PDF of remaining 50 questions,
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General knowledge plays a vital role in all competitive exams. Among all the subjects, physical science GK questions are considered one of the toughest parts. If you do not prepare it properly then you will not be able to be in the merit list.