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 663 of 697
13241. A standing wave pattern is formed when the length of string is an integral multiple of wavelength.
- A. Triple.
- B. Full.
- C. Half.
- D. Double.
Explanation: Standing or stationary waves are formed when the vibrating medium is made to vibrate giving rise to a waveform without displacing the…
Correct answer: Half.- A. First.
- B. Second.
- C. Third.
- D. None of these.
Explanation: KVL, Kirchoff's voltage law or Kirchoff's loop rule states that within a closed loop containing multiple emf sources and resistors, their…
Correct answer: Second.- A. Heat energy into Electrical energy
- B. Chemical energy into Electrical energy
- C. Solar energy into Electrical energy
- D. Mechanical energy into Electrical energy
Explanation: Explanation:The energy supplied by the cell to the charge carriers is derived from the conversion of chemical energy into electrical…
Correct answer: Chemical energy into Electrical energy- A. 5 Ω
- B. 2 Ω
- C. 3 Ω
- D. 4 Ω
Explanation: Explanation: Galvanometer resistance = G = 20Ω Current = I1 = 10A Current = I2 = 2 A Shunt resistance = Rs = ?So, n = I1 / I2 n = 10 / 2 =…
Correct answer: 5 Ω- A. At an angle of 180° with the galvanometer
- B. Parallel with the galvanometer
- C. At an angle of 45° with the galvanometer
- D. Perpendicular to the galvanometer
Explanation: Explanation:The current measuring part of an ammeter consists of a low resistance connected in parallel with the galvanometer.
Correct answer: Parallel with the galvanometer- A. Internal structure of OP-AMP
- B. Externally connected resistance
- C. Voltage of power supplies
- D. Input resistance
Explanation: The correct answer is B: Externally connected resistance. The closed loop gain of an OP-AMP is determined by the feedback network, which…
Correct answer: Externally connected resistance- A. Electronic current
- B. Electric current
- C. Magnetic lines
- D. Conventional current
Explanation: The correct answer is D: Conventional current. Conventional current is defined by the direction in which positive charges would flow, from…
Correct answer: Conventional current13248. 2.00 x 10^6 e passing through a conductor in 1 millisecond. Electric current through conductor is:
- A. 3.2 x 10^-10 A
- B. 32.0 x 10^-9 A
- C. 320 x 10^-10 A
- D. 0.320 x 10^-10
Explanation: Charge on an electron is 1.6x10-¹⁹CWhat will be the total charge on n number of electrons?In this case, n=2x10⁶ electrons E=neWhere e is…
Correct answer: 3.2 x 10^-10 A- A. 1 A
- B. 1.5 A
- C. 5 A
- D. 6 A
Explanation: Given: Voltage = V = 3V Resistance = R = 2Ω Current = I = ? As we know that: V = IR I = V / R = 3 / 2 I = 1.5 A
Correct answer: 1.5 A- A. Polarization
- B. Destructive interference.
- C. Constructive interference.
- D. Reflection.
Explanation: During constructive interference the path difference between the concave lens and the reflective surface i.e.
Correct answer: Destructive interference.- A. Interference.
- B. Polarization.
- C. Stationary waves.
- D. Beats.
Explanation: Two waves of slightly different frequencies travelling in the same direction produce beats.
Correct answer: Beats.- A. 5 mm
- B. 1.33 mm
- C. 0.5 mm
- D. 50 mm
Explanation: x=λ D/a, where λ is the wavelength of light, D is the distance between screen and slits, a is the slit separation, and x is the fringe…
Correct answer: 5 mm- A. Stationary Waves
- B. Beats
- C. Interference
- D. Both B and C
Explanation: Explanation:Two waves of slightly different frequencies and travelling in the same direction lead to the production of beats.
Correct answer: Beats- A. Zero
- B. Double the original value
- C. One
- D. Half of the original value
Explanation: Explanation:The Fringe spacing would be doubled. This is because the fringe spacing is proportional to the distance between the slits and…
Correct answer: Double the original value- A. 588 nm
- B. 348 nm
- C. 620 nm
- D. 400 nm
Explanation: Explanation: L = mλ / 2 λ = 2L / m = 2 × 0.233 × 10-3 / 792 = 2 × 233 × 10-6 / 792 = 466 × 10-6 / 792 = 0.588 × 10-6 m = 588 × 10-9 m λ =…
Correct answer: 588 nm- A. Zero amplitude
- B. The sum of the amplitudes of the two waves
- C. Difference of the amplitudes of the two waves
- D. Double the amplitude of either wave
Explanation: The correct answer is A) Zero amplitude. When two sound waves with identical amplitudes are completely out of phase, they interfere…
Correct answer: Zero amplitude- A. 244 Hz
- B. 236 Hz
- C. 248 Hz
- D. 246 Hz
Explanation: The beat frequency is the absolute difference between two frequencies. For the source 'Y' to produce 4 beats with 240 Hz, it can be either…
Correct answer: 244 Hz- A. (m + ½) λ
- B. mλ
- C. d sin θ
- D. 3λ
Explanation: Destructive interference occurs when the path difference between two waves is an odd multiple of half wavelengths, expressed as (m + ½)λ…
Correct answer: (m + ½) λ- A. The path difference of the light waves from the two sources must be large
- B. The interfering waves must be non-coherent
- C. The light waves may come from different sources
- D. The light waves must come from two coherent sources
Explanation: For light waves to successfully interfere the sources of the waves must be coherent, which means they emit identical waves with a constant…
Correct answer: The light waves must come from two coherent sources- A. 23
- B. 12
- C. 0
- D. 1
Explanation: If general equation for destructive interference is given by the relation Optic path difference = (m+(1/2)), where 'm' is an integer, then…
Correct answer: 0