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 664 of 697
- A. (n +½) λ where n = 0, 1, 2, .............
- B. nλ where n = 0, 1, 2, .............
- C. (2n + 1) λ/2 where n = 0, 1, 2, .............
- D. ((n +1)/2) λ2 where n = 0, 1, 2, ............
Explanation: For maximum intensity or bright fringe to be formed at P Path difference, Δz = nλ (n = 0, ±1, ±2, . . . .)
Correct answer: nλ where n = 0, 1, 2, .............- A. nπ radian
- B. 2π n radian
- C. (n+½) π radian
- D. (2n+1) π radian
Explanation: Dark fringes are formed when we have destructive interference and since destructive interferences happen at phase differences being odd…
Correct answer: (n+½) π radian- A. -0.01
- B. -1/273
- C. 0.01
- D. 1/273
Explanation: (The mcq option seem incorrrect, the only explanation possible is as follows;)Given that,Resistance at 0°C = 100ΩResistance at 100°C =…
Correct answer: 0.01- A. vt = 4gr2ρ / 9η
- B. vt = 9ηr2ρ / 4g
- C. vt = 2gr2ρ / 9η
- D. vt = 9ηr2ρ / 2g
Explanation: Explanation:Using strokes law, 6πηrvt = mg Where, m = 4/3 πr³ρComparing both equations, we get: r² = 9ηvt /2ρg vt = 2gr²ρ / 9η
Correct answer: vt = 2gr2ρ / 9η- A. 50%
- B. 40%
- C. 60%
- D. 70%
Explanation: To find the maximum possible efficiency of the steam turbine, we use the Carnot efficiency formula: η = (T1 - T2) / T1, where T1 and T2…
Correct answer: 50%- A. 8314 J mol-1K-1
- B. 83.14 J mol-1K-2
- C. 831.4 J mol-1K-1
- D. 8.314 J mol-1K-1
Explanation: Universal gas constant is 8.314 J mol-1K-1.
Correct answer: 8.314 J mol-1K-1- A. 273.16
- B. 273.16 Q2/Q1
- C. 273.16 Q
- D. 273.16 Q1/Q2
Explanation: 𝑇 1 𝑇 2 = 𝑄1 𝑄2 The triple point of water is 0.01C or 273.16K. Inputting this value as T2 in equation above we get the answer.
Correct answer: 273.16 Q1/Q2- A. 6.21 x 10^-21 J
- B. 5 x 10^-21 J
- C. 6.21 x 10^-12 J
- D. 6 x 10^-21 J
Explanation: The mean translational kinetic energy of an ideal gas is calculated using the formula: K.E.
Correct answer: 6 x 10^-21 J- A. Is reduced
- B. Is increased
- C. Remains same
- D. None of these
Explanation: A transformer essentially converts between voltage and current using a magnetic field, a step down transformer, steps down the input…
Correct answer: Is increased- A. By increasing the turn ratio
- B. By decreasing the turn ratio
- C. By minimizing Eddy currents
- D. By selecting core materials with a large hysteresis area
Explanation: Explanation:This option is correct because the flow of Eddy currents in the core of the transformer results in power loses due to heat.
Correct answer: By minimizing Eddy currents- A. Magnetic, electrically
- B. Electrical, magnetically
- C. Magnetic, magnetically
- D. Electrical, optically
Explanation: In a transformer, there is no electrical connection between the two coils, which are typically referred to as the primary and secondary…
Correct answer: Electrical, magnetically13272. In an ideal transformer:
- A. Power input is equal to Power output.
- B. Power input is less than half of the power output.
- C. Power input is greater than Power output
- D. Power input is more than half of the power output.
Explanation: A is Correct, as an ideal transformer operates with 100% efficiency, meaning no energy is lost
Correct answer: Power input is equal to Power output.- A. fλ
- B. λ/T
- C. Both A and B
- D. λT
Explanation: Explanation:The speed of a wave can be calculated using the formula: v = fλwhere v is the wave speed, f is the frequency of the wave, and…
Correct answer: Both A and B- A. 650Hz
- B. 20Hz
- C. 26Hz
- D. 3.8x10² Hz
Explanation: We know, The product of wavelength and frequency is speed c of waveMathematically:fx𝞴=cf=c/𝞴f=130/5f=26Hz.
Correct answer: 26Hz- A. 2π √ R / g
- B. 2π √ ℓ / g
- C. 1 / 2π √ R / g
- D. f ≥ √(g / r)
Explanation: Explanation:When a spaceship raotates, the centripetal force creates a sensation of artificial gravity on the spaceship's interior.
Correct answer: f ≥ √(g / r)- A. Equal to its real weight
- B. Less than its real weight
- C. Zero
- D. Greater than its real weight
Explanation: The apparent weight of an object is the force exerted by the object on the surface it is resting on.
Correct answer: Greater than its real weight- A. 1000 N
- B. 10 N
- C. 500 N
- D. Zero
Explanation: Being free fall, the man will be in a state of weightlessness As it is a numerical, it can have only one possible answer.
Correct answer: Zero- A. 92.5 J
- B. 97.5 J
- C. 65 J
- D. 130 J
Explanation: Explanation:Final Kinetic energy (K.Ef) = 130 JInitial Kinetic energy (K.Ei) = 65 JWorkdone = W = ?As we know that: W = K.Ef - K.Ei = 130…
Correct answer: 65 J- A. -10
- B. +10
- C. -18
- D. +18
Explanation: Work is a scalar quantity and work done is a dot product of force and displacement.The difference between the two pints will be our…
Correct answer: +10- A. 1500 J
- B. 3000 J
- C. 4500 J
- D. 5000 J
- E. 9, 500 J
Explanation: The thermodynamic work done is W = PdVAs dV = 0 for path b to c it will not contribute any work.The work done will come from path a to b…
Correct answer: 4500 J