MCQs on Physics

[Set - 3]

1. Which concept in physics explains the behavior of very cold atoms?

A) Thermodynamics
B) Quantum Mechanics
C) Classical Mechanics
D) Electrodynamics

Correct Answer: B) Quantum Mechanics
Explanation: Quantum mechanics is the branch of physics that explains the behavior of particles at very small scales, including the behavior of atoms at very low temperatures.

2. What property of sound is primarily affected by temperature?

A) Pitch
B) Loudness
C) Speed
D) Timbre

Correct Answer: C) Speed
Explanation: The speed of sound is affected by the temperature of the medium through which it travels. Higher temperatures typically increase the speed of sound in air.

3. In which device is the principle of the conservation of momentum applied?

A) Electric Motor
B) Refrigerator
C) Rocket
D) Battery

Correct Answer: C) Rocket
Explanation: Rockets operate on the principle of conservation of momentum. The momentum of the ejected exhaust gas from a rocket in one direction gives an equal and opposite momentum to the rocket itself.

4. What is the primary cause of tides in the earth's oceans?

A) Wind
B) Sun
C) Moon
D) Centrifugal force

Correct Answer: C) Moon
Explanation: The primary cause of tides in Earth’s oceans is the gravitational pull of the moon, which pulls the water towards it, creating tidal forces.

5. What type of circuit prevents the flow of direct current while allowing alternating current to pass?

A) Resistor
B) Capacitor
C) Inductor
D) Transformer

Correct Answer: B) Capacitor
Explanation: A capacitor blocks direct current (DC) but allows alternating current (AC) to pass through it, making it an essential component in various electronic circuits.

6. Who is credited with the invention of the dynamo?

A) Thomas Edison
B) Nikola Tesla
C) Michael Faraday
D) James Watt

Correct Answer: C) Michael Faraday
Explanation: Michael Faraday is credited with the invention of the dynamo, which is a device that converts mechanical energy into electrical energy.

7. Which instrument is used to measure atmospheric pressure?

A) Anemometer
B) Barometer
C) Hygrometer
D) Thermometer

Correct Answer: B) Barometer
Explanation: A barometer is used to measure atmospheric pressure. It is a crucial tool in meteorology for weather prediction.

8. What phenomenon results from the interference of light waves from different coherent sources?

A) Polarization
B) Refraction
C) Diffraction
D) Interference

Correct Answer: D) Interference
Explanation: Interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude.

9. What is the change in direction of a wave passing from one medium to another called?

A) Reflection
B) Refraction
C) Diffraction
D) Dispersion

Correct Answer: B) Refraction
Explanation: Refraction is the change in direction of a wave passing from one medium to another caused by its change in speed.

10. What is it called when light changes direction as it passes at an angle from one medium to another?

A) Reflection
B) Refraction
C) Absorption
D) Scattering

Correct Answer: B) Refraction
Explanation: Refraction occurs when light waves change direction due to passing through different mediums at an angle, altering their speed.

11. What term describes the bending of light waves around obstacles?

A) Reflection
B) Refraction
C) Diffraction
D) Dispersion

Correct Answer: C) Diffraction
Explanation: Diffraction refers to the bending of light waves around obstacles and the spreading out of waves past small openings.

12. Which law states that equal volumes of all gases, at the same temperature and pressure, contain the same number of molecules?

A) Charles’s Law
B) Gay-Lussac’s Law
C) Boyle’s Law
D) Avogadro’s Law

Correct Answer: D) Avogadro’s Law
Explanation: Avogadro’s Law states that equal volumes of all gases, at the same temperature and pressure, contain the same number of molecules.

13. What device converts electrical energy into mechanical energy?

A) Generator
B) Motor
C) Battery
D) Transformer

Correct Answer: B) Motor
Explanation: An electric motor converts electrical energy into mechanical energy, typically by electromagnetic interactions.

14. What is the SI unit of luminous intensity?

A) Candela
B) Lux
C) Lumen
D) Watt

Correct Answer: A) Candela
Explanation: The candela is the SI unit of luminous intensity; it measures the perceived power emitted by a light source in a particular direction.

15. Which physicist introduced the concept of contact electrification?

A) Albert Einstein
B) Charles-Augustin de Coulomb
C) Benjamin Franklin
D) Alessandro Volta

Correct Answer: C) Benjamin Franklin
Explanation: Benjamin Franklin introduced the concept of contact electrification, which involves the transfer of electric charge between two materials when they are brought into contact and then separated.

16. Which of the following is not a vector quantity?

A) Velocity
B) Acceleration
C) Energy
D) Force

Correct Answer: C) Energy
Explanation: Energy is a scalar quantity because it does not have a direction associated with it, unlike vector quantities such as velocity, acceleration, and force.

17. What is the phenomenon of an electron emitting from a metal surface due to heat called?

A) Photoelectric effect
B) Compton scattering
C) Cathode ray emission
D) Thermionic emission

Correct Answer: D) Thermionic emission
Explanation: Thermionic emission is the release of electrons from a heated metal surface, an effect used in vacuum tubes and cathode ray tubes.

18. What principle is used to measure the speed of an object using the Doppler effect?

A) Bernoulli’s principle
B) Archimedes’ principle
C) Doppler radar
D) Radar gun

Correct Answer: C) Doppler radar
Explanation: Doppler radar utilizes the Doppler effect to measure the speed of an object by analyzing the change in frequency of the returned radar signal.

19. Which law states that the induced electromotive force in any closed circuit is equal to the rate of change of the magnetic flux through the circuit?

A) Ohm’s Law
B) Faraday’s Law of emi
C) Lenz’s Law
D) Kirchhoff’s Voltage Law

Correct Answer: B) Faraday’s Law of emi
Explanation: Faraday’s Law of Electromagnetic Induction states that the induced electromotive force in any closed circuit is equal to the rate of change of the magnetic flux through the circuit, a fundamental principle in electromagnetism.

20. What is the measure of the total amount of kinetic energy due to molecular motion in a substance?

A) Heat
B) Temperature
C) Energy
D) Entropy

Correct Answer: A) Heat
Explanation: Heat is the transfer of thermal energy from one system to another and is a measure of the total kinetic energy of particles in a substance.

Share this with your friends

Solve More MCQs on Physics

    •   Back
    • MCQs History
    • MCQs Geography
    • MCQs Polity
    • MCQs Economy
    • MCQs Physics
    • MCQs Chemistry
    • MCQs Biology
    • MCQs Art and Culture
    • MCQs Science and Technology
    • MCQs Environment and Ecology
    • MCQs Inventions and Discoveries
    • MCQs Awards and Honors
    • MCQs Important days and dates
    • MCQs Famous Personalities
Show All
Lorem Ipsum is simply dumy text of the printing typesetting industry lorem ipsum.

Subscribe to our Newsletter

Subscribe to our Newsletter

& stay ahead of your competitors!

You have been successfully Subscribed! Ops! Something went wrong, please try again.
Subscribe Form

* Subscribe to our email newsletter to get the latest posts delivered right to your email.

© MCQs 4 Exams. All rights reserved.