All Free Physics MCQs with Answers
Every Physics question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,934 questions · page 686 of 697
- A. Zero
- B. E/8
- C. E/4
- D. E/2
Explanation: K.E=E=1/2mv2K.E=1/2mvx2 (horizontal velocity)K.E= 1/2m x (vcos 60)2K.E=1/2mv2 (0.5)2K.E=1/2mv2 (o.25)K.E=1/2mv2 (¼)K.E= ¼ ( ½ mv2)K.E = ¼…
Correct answer: E/413702. Two projectiles are in flight at the same time. The acceleration of one relative to the other:
- A. Is always 9.8 m/s2
- B. Can be as large as 19.8 m/s2
- C. Can be horizontal
- D. Is zero
Explanation: The correct answer is that the acceleration of one projectile relative to the other is zero.
Correct answer: Is zero- A. 0o
- B. 45o
- C. 90o
- D. None of the above
Explanation: When the projectile reaches the highest point of its trajectory, the angle between its velocity and acceleration is 90 degrees.
Correct answer: 90o- A. Space
- B. Inertial frame of reference
- C. Speed of light
- D. Time
Explanation: In Physics, a dimension can be defined as the magnitude of something in a particular direction.
Correct answer: Time- A. 0.511 MeV
- B. 1 MeV
- C. 8.0x10 J
- D. None of the above
Explanation: Eo=moc^2Where,c2= velocity of light which is 3×10^8 m/smo=rest mass of an electron which is 9.11×10−31 kgEo=rest mass energyPut value of…
Correct answer: 0.511 MeV- A. Slower
- B. Faster
- C. Same
- D. Clicks negative time
Explanation: According to Einstein's Special Theory of Relativity, Time for a moving reference frame actually slows down compared to a "stationary"…
Correct answer: Slower- A. will shift towards the longer wavelength
- B. will shift towards the shorter wavelength
- C. will not change
- D. None of these
Explanation: As the temperature of the blackbody increases, the peak wavelength decreases (Wien's Law).
Correct answer: will shift towards the shorter wavelength- A. Remain constant
- B. Become zero
- C. Become equal to rest mass of particle
- D. Become infinite
Explanation: Using the formula for mass dilationWhen an object travels at v = c, the factor becomes equal to zero.Dividing mo by zero leads to mass…
Correct answer: Become infinite13709. LASER light is the result of
- A. Spontaneous emission
- B. Ordinary emission
- C. Absorption of radiation
- D. Stimulated emission
Explanation: Laser stands for Light Amplification by Stimulated Emission of Radiation. Laser light utilizes stimulated emission.
Correct answer: Stimulated emission- A. ΔpΔx = h
- B. ΔEΔI=h
- C. Both (a) and (b)
- D. None
Explanation: The Heisenberg uncertainty principle explains that momentum and position of a particle cannot be simultaneously at the same time with 100%…
Correct answer: Both (a) and (b)- A. 0.511 MeV
- B. 1 MeV
- C. 8.0 x 10^-14 J
- D. None of the above
Explanation: The rest mass energy of a particle is calculated by the formula E = mc2, where m is the rest mass and c is the speed of light.
Correct answer: 0.511 MeV13712. To an observer stationary on a plateform a compared to a stationary clock and a moving clock clicks:
- A. slower
- B. faster
- C. same rate as stationary clock
- D. clicks negative time
Explanation: The correct answer is that the moving clock ticks slower as observed from a stationary platform.
Correct answer: slower- A. Infinite
- B. Zero m
- C. 2 meter
- D. None of above.
Explanation: Formula for length contraction is L=L0√1−v2/c2, where: • L = new length (m) • L0 = original length (m) • v = speed of object (ms−1) • c =…
Correct answer: Zero m- A. 0.51 joule
- B. 1.02 joule
- C. 9.11 x 10^-32 joule
- D. 8.2 x 10^-14 joule
Explanation: The rest mass energy of an electron can be calculated using Einstein's equation:E = mc²E = 9.11 × 10-31 × (3 × 108)²E = 9.11 × 10-31 × 9 ×…
Correct answer: 8.2 x 10^-14 joule- A. Equal to the speed of light
- B. Greater than speed of light
- C. Comparable to the speed of light
- D. None of these
Explanation: When a charge moves at a relativistic speed, it means it is moving at a significant fraction of the speed of light, approaching but not…
Correct answer: Comparable to the speed of light- A. ionized state
- B. stimulations
- C. population inversion
- D. all of these
Explanation: GROUND STATE: The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron.
Correct answer: population inversion- A. photoelectric effect
- B. compton effect
- C. penetrating effect
- D. diffraction
Explanation: The wave nature of an electron is illustrated by its electron diffraction, as explained by davisson germer experiment.
Correct answer: diffraction13718. If the temperature of the black body doubles, the intensity of radiation from it will become:
- A. double
- B. four times
- C. six times
- D. sixteen times
Explanation: BLACK BODY: A blackbody is a theoretical or model body that absorbs all radiation falling on it, reflecting or transmitting none.
Correct answer: sixteen times- A. penetrating power of x-ray increases
- B. intensity of x-rays increases
- C. wavelength of x-rays increases
- D. all of these
Explanation: X-RAY TUBE: An X-ray tube is a vacuum tube that converts electrical input power into X-rays.
Correct answer: intensity of x-rays increases- A. Photon
- B. Roton
- C. Positron
- D. Antineutrino
Explanation: Antimatter is a type of matter made up of antiparticles. A positron is the antiparticle of an electron, making it the correct answer.
Correct answer: Positron