About Physics


As a result of its incorporation of astronomy, physics is one of the oldest academic sciences. While these natural sciences have been part of natural philosophy for much of the past two millennia, they emerged as distinct research endeavors during the Scientific Revolution of 17th-century Europe. Biophysics and quantum chemistry are only two examples of areas where physics crosses with other, more multidisciplinary fields of study. These and other academic subjects such as mathematics and philosophy can benefit from new ideas in physics since they frequently explain the underlying mechanisms explored by other sciences

Introduction & Meaning

Physics is a branch of study concerned with the structure of matter and the interactions of the universe's fundamental elements. The largest definition of physics (from the Greek physikos) is the study of nature at all scales, from the macro to the micro. Beyond seeing how objects behave when subjected to a specific force, astrophysics studies gravitational, electromagnetic, and nuclear force fields in depth. Its ultimate goal is to develop a few fundamental concepts that can explain and unite all of these different aspects.


A natural science, physics focuses on the matter, its basic elements, its mobility and behavior over time and space, and the associated phenomena of energy and force. In physics, understanding how the world works is the primary objective, making it one of the most fundamental scientific fields.

Following are some of the multiple choice questions on the Physics with answers that will help the students in developing their knowledge.

Physics MCQ

1. What is acceleration?

  • The speed and direction of an object's motion. 
  • An increase or decrease in speed, or a change in direction. 
  • The tendency of an object to resist change in its motion. 
  • none of the above

2. What is velocity?

  • the quickness of an object
  • the location of an object
  • acceleration
  • speed in a specific direction

3. What is current?

  • The flow of charge
  • The potential of motion
  • The flow of energy
  • Motion of energy

4. What is Resistance?

  • An electrical quantity that measures how a device resist to motion
  • An electrical quantity that measures how a device or material reduces electric current
  • An electrical quantity that measures how a device resist to energy
  • An electrical quantity that measures how a device reduces energy

5. What is voltage?

  • What creates electricity
  • What creates energy
  • What creates current
  • What creates volts

6. De Broglie equation

  • relates the momentum of a mass to its wavelength
  • relates the energy of a mass to its wavelength
  • relates the frequency of a mass to its wavelength
  • relates the work function of a mass to its wavelength

7. What is Newton's First Law

  • F=ma
  • Every action has an equal and opposite reaction
  • An object at rest stays at rest, an object in motion stays in motion. 
  • Friction 

8. The gravitational force between two bodies is

  • repulsive at large distances
  • attractive at all places
  • repulsive at short distances
  • attractive at short distances

9. How do solar panels work?

  • Sun hits the solar panel and releases quarks
  • Light hits the solar panel and releases photons
  • Photons hit the solar panel and release electrons
  • Electrons jump energy levels and release photons

10. How does a star form?

  • Contraction of a large amount of gas into heavier element by way of nuclear fusion
  • Contraction of a large amount of gas into heavier element by way of nuclear fission
  • Expansion of large amount of gas by nuclear fission
  • Expansion of large amount of gas by nuclear fusion

11. What is the unit of Astronomical Distance ?

  • Light year
  • Angstrom
  • Weber
  • Lux

12. What is radioactive decay?

  • The spontaneous breakdown of an atomic nucleus resulting in only energy release
  • The spontaneous breakdown of an atomic nucleus resulting in only matter release
  • The spontaneous breakdown of an atomic nucleus resulting in a release of energy and matter
  • The decay of the use of radios and the increased use of televisions.

13. Which is an example of zero acceleration?

  • A merri-go-round moving at a constant rate
  • A car coming to a stop
  • A boat speeding up
  • A person running on a treadmill at a rate of 6 MPH

14. What separates the outer ear from the middle ear?

  • Auricle
  • The ear wall
  • Eardrum
  • Cochlea

15. What is the mass of an alpha particle?

  • 1
  • 2
  • 3
  • 4

16. The function representing matter waves must be ________

  • Complex
  • Real
  • Zero
  • Infinity

17. Which law is also called the law of inertia ?

  • Newton's Second Law
  • Newton's Third Law
  • Newton's first law
  • All of the above

18. Which one is correct Schrodinger time dependent equation?

  • H = E
  • H = Eψ
  • Hψ = ψ
  • Hψ = Eψ

19. A lens that is thicker in the middle and thinner on the ends is a

  • Focal lens
  • Convex lens
  • diverging lenses
  • All of above

20. What is the definition of an isotope?

  • An atom with different electron number to proton number
  • An atom with different proton number from neutron number
  • An atom with different number of protons from the periodic table
  • An atom with a different number of neutrons from the periodic table

21. The operator ∇2 is called _______ operator

  • Hamiltonian
  • Laplacian
  • Poisson
  • Vector

22. The square of the magnitude of the wave function is called_________

  • Current density
  • Probability density
  • Zero density
  • Volume density

23. What is the definition of magnitude?

  • To continue moving.
  • The strength of an object or event.
  • Energy in motion.
  • The sum of all the forces exerted on an object

24. Newton's Second Law states.........................

  • that an object in motion, stays in motion; an object at rest stays at rest. 
  • For every action there is an equal and opposite reaction.
  • that acceleration occurs when a force acts upon an object. 
  • none of the above

25. Balanced Force

  • The net force of an object does not equal zero which results in a change in the motion of the object.
  • The net force on an object is zero and the object’s motion does not change.
  • The sum of all the forces acting on an object,
  • The sum of the the forces stored in energy.

26. What happens when two forces act in the same direction?

  • They cancel each other out.
  • The stronger one prevails.
  • Their strengths are added.
  • Their sum divided by two is the total force.

27. The normalized wave function must have ________ norm

  • Infinite
  • Zero
  • Finite
  • Complex

28. Which of the following would produce the loudest sound?

  • jet plane
  • pin falling
  • doorbell
  • whisper

29. When an object rolls over a surface.

  • Sliding Friction 
  • Rolling Friction 
  • Fluid Friction 
  • All of above

30. Ball pen works on principle of

  • Boyle's law
  • Newton's law
  • Viscosity
  • Capillarity and surface tension

31. Which of the following is unit of force ?

  • Newton
  • Dyne
  • Joule
  • Both A & B

32. What is a beta particle made of?

  • One proton
  • A helium particle
  • One electron
  • One proton and one neutron

33. A ____ is a discrete, quantized bundle of energy

  • Photoelectric effect
  • Photon
  • Quantized
  • Proton

34. A jet engine works on the principle of conservation of

  • Linear momentum
  • Angular momentum
  • Energy Mass
  • Mass Velocity

35. What does pitch depend on?

  • amplitude 
  • frequency
  • intensity 
  • volume of sound

36. Morgan walks 10 miles South. Trevor walks 10 miles North in the same amount of time. They have:

  • Different average speeds
  • Different velocities
  • Same velocity
  • Same motion

37. When you make sounds by plucking a rubber band, you make the rubber band move back and forth very quickly. This movement is called.

  • loudness
  • amplitude
  • pitch
  • vibration

38. What is the name of the process of heat transfer using electromagnetic waves?

  • conduction
  • convection
  • evaporation
  • radiation

39. Forces can be added together only if they are

  • acting on the same object
  • unaffected by gravity
  • balanced forces
  • substantial

40. The force of gravity on a person or object on the surface of a planet is called

  • mass.
  • weight.
  • terminal velocity
  • free fall.

41. How many variables should be changed in an experiment?

  • 1
  • 2
  • 3
  • doesn't matter

42. When does radioactive decay occur?

  • When the nucleus of an isotope is unstable
  • When the nucleus of an isotope is stable
  • When the electrons of an isotope are spinning
  • When the electrons of an isotope are shared with another isotope

43. What is a force that pulls objects together?

  • Friction Force
  • Gravity Force
  • Buoyant Force
  • Centripetal Force

44. What happens when an object accelerates?

  • Its speed or direction changes
  • Only its speed changes
  • Only its direction changes
  • Its speed and direction do not change

45. A disturbance that travels through a medium as a longitudinal wave

  • sound
  • wavelength
  • pitch
  • frequency

46. What are the SI units for power?

  • Watts
  • Ohms
  • Volts
  • Amperes

47. What are the SI units for resistance?

  • Watts
  • Ohms
  • Volts
  • Amperes

48. Which of the following quantities has dimensional formula M L-3 T0?

  • Force
  • Weight
  • Volume
  • Density

49. According to Newton’s third law of motion, the strength of a reaction force is ____________________ the strength of the action force.

  • equal to
  • negative to
  • positive to
  • greater than

50. When you see the word "MOVING" what should you think?

  • Unbalanced
  • Balanced
  • Potential Energy
  • No Work

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