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 661 of 697
- A. aS = vf2 - vi2
- B. 2aS = vf2 - vi2
- C. 2S = a(vf2 - vi2)
- D. aS = 2(vf2 - vi2)
Explanation: The correct answer is Option B: 2aS = vf2 - vi2. This is the third equation of motion, which is crucial for determining the maximum height…
Correct answer: 2aS = vf2 - vi2- A. X-ray
- B. Proton.
- C. Electron.
- D. Photon.
Explanation: Heating the metal filament in the cathode ray tube causes an increase in energy of the filament which enables electrons to be released…
Correct answer: Electron.- A. AM radio
- B. Long radio
- C. Shorter
- D. Both A and C
Explanation: When the temperature of an object is increased it emits light of shorter wavelength according to E=hc/lambda, since the energy of the…
Correct answer: Shorter- A. Mass variation
- B. Energy - mass relationship
- C. Inertia forces
- D. All of these
Explanation: In this case, we look at mass alteration as the speed of object increases.The mathematical expression can be given as, m=mo/√(1-v2/ c2)If…
Correct answer: All of these- A. 4.28 x 10^-7 Wm-2K-4
- B. 4.28 x 10^-4 Wm-2K-4
- C. 3.62 x 10^-4 Wm-2K-4
- D. 5.67 x 10^-8 Wm-2K-4
Explanation: Explanation: The value of Stefan's Boltzmann constant is 5.67 × 10-8Wm-2K-4.
Correct answer: 5.67 x 10^-8 Wm-2K-4- A. 1.68 x 10^-27 m
- B. 1.65 x 10^-29 m
- C. 1.70 x 10^-25 m
- D. 1.66 x 10^-29 m
Explanation: Explanation: The de Broglie's wavelength (λ) of a particle is given by the equation: λ = h / pWhere h is the planck's constant and p is…
Correct answer: 1.66 x 10^-29 m- A. Intense beam of light
- B. Coherent beam of light
- C. Intense, Coherent, Monochromatic beam of light
- D. Monochromatic beam of light
Explanation: Explanation:LASER (Light Amplification by Stimulated Emission of Radiation) is a device that produces a beam of light through the process…
Correct answer: Intense, Coherent, Monochromatic beam of light- A. 2.5 kWm-2
- B. 0.6 kWm-2
- C. 1.4 kWm-2
- D. 2.0 kWm-2
Explanation: Explanation:Solar energy at normal incidence outside the Earth's atmosphere is also known as solar constant.
Correct answer: 1.4 kWm-2- A. 2.90 x 10^-3 mK
- B. 3.34 x 10^-4 mK
- C. 4.22 x 10^-7 mK
- D. 3.42 x 10^-8 mK
Explanation: Wien's Law states that the product of the wavelength corresponding to the maximum intensity of radiation and the temperature of the body…
Correct answer: 2.90 x 10^-3 mK- A. 1.05 x 10^-41 J
- B. 1.05 x 10^-26 J
- C. 1.15 x 10^10 J
- D. 2.19 x 10^-40 J
Explanation: The uncertainty in energy can be determined using the energy-time uncertainty principle: ΔE = h/Δt, where h is Planck's constant…
Correct answer: 1.05 x 10^-26 J- A. 9.108 × 10−30g
- B. 9.108 × 10−25 g
- C. 9.108 × 10−31 g
- D. Too less to be measured
Explanation: 9.108 × 10-30 g: This option represents the approximate weight of an electron.
Correct answer: 9.108 × 10−31 g- A. Hydrogen
- B. Helium
- C. Neon
- D. Carbon dioxide
Explanation: A gas laser is a laser in which an electric current is discharged through a gas inside the laser medium to produce laser light.
Correct answer: Helium- A. An electron which was existing outside the nucleus.
- B. An electron which was existing inside the nucleus.
- C. An electron emitted by the nucleus as a of the decay of neutrons inside the nucleus.
- D. A pulse of electromagnetic waves.
Explanation: An unstable atom can attain stability by radioactive decay such as alpha, beta or gamma decay.
Correct answer: An electron emitted by the nucleus as a of the decay of neutrons inside the nucleus.- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Explanation:γ radiation causes no change in the atomic mass or atomic number.
Correct answer: Option D- A. Bismuth
- B. Protactinium
- C. Polonium
- D. Palladium
Explanation: Thorium-234 has a half-life of 24.1 days, emitting a beta particle that results in its transformation to protactinium-234.
Correct answer: Protactinium- A. Bismuth
- B. Protactinium
- C. Polonium
- D. Palladium
Explanation: The emission of gamma rays, or γ-rays, from radioactive elements is a process that typically occurs when an unstable nucleus undergoes…
Correct answer: Polonium- A. Fx = 4√3 and Fy = 8
- B. Fx = 8 and Fy = 4√3
- C. Fx = 4√3 and Fy = 4
- D. Fx = 8√3 and Fy = 4
Explanation: The x and y components of a force vector can be found using trigonometric functions: the x-component is given by Fx = F cosθ, and the…
Correct answer: Fx = 4√3 and Fy = 4- A. Wheatstone Circuit
- B. Bridge circuit
- C. Filter circuit
- D. Ripple circuit
Explanation: The filter circuit incorporates a capacitor which charges and discharges in order to smooth the circuit.
Correct answer: Filter circuit- A. Red
- B. Green
- C. Blue
- D. Brown
Explanation: A carbon-composition resistor can have 4 to 6 bands. The assignment of colour according to their bands is shown in the table.The mnemonic…
Correct answer: Green- A. Decrease in temperature and decrease in resistance
- B. Increase in temperature and increase in resistance
- C. Decrease in temperature and increase in resistance
- D. Increase in temperature and decrease in resistance
Explanation: Explanation:The deviation of an I-V graph from a straight line is due to the fact that the resistance of a material changes with…
Correct answer: Increase in temperature and increase in resistance