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 685 of 697
- A. 1.2 kW
- B. 12kW
- C. 120kW
- D. 1200kW
Explanation: Students should remember the formula of power i.e Force x speed So power = (mass x g) x speed assume g = 10] Power = (40 x 10) x 3 = 1200…
Correct answer: 1.2 kW- A. 1
- B. 16/25
- C. 25/16
- D. 4/5
Explanation: Power of first boy / Power of second boy ∝ (Weight of first boy / Weight of second boy) × (Time taken by second boy / Time taken by first…
Correct answer: 16/25- A. 2.5 W
- B. 25 W
- C. 75 W
- D. 2000 W
Explanation: To find the rate at which the force is doing work (power), we first need to determine the velocity of the crate after it has moved 2…
Correct answer: 2000 W- A. Halved
- B. Doubled
- C. Quadrupled
- D. Remain the same
Explanation: The correct option is C Quadrupled. The energy transported by a wave is directly proportional to the square of the amplitude of the wave.
Correct answer: Quadrupled- A. Vibrate parallel to the direction of propagation of waves
- B. Vibrate perpendicular in to the direction of propagation of waves
- C. Do not move at all
- D. Vibrate at an angle of 360° to the direction of waves
Explanation: Fact. In longitudinal waves the movement of the particle is along the direction of the wave i.e the movement of particles is usually…
Correct answer: Vibrate parallel to the direction of propagation of waves- A. Wavelength squared
- B. Amplitude squared
- C. Square root of the wavelength
- D. Square root of the amplitude
Explanation: Water is a transverse mechanical wave so we know that the power and energy carried by the wave is directly proportional to the square of…
Correct answer: Amplitude squared- A. 0°
- B. 180°
- C. 90°
- D. 45°
Explanation: When the transverse wave travels from the rarer medium to the denser medium, it gets reflected from the denser medium, where a phase…
Correct answer: 180°13688. Sound waves cannot be:
- A. Polarized
- B. Reflected
- C. Refracted
- D. Diffracted
Explanation: Sound waves are longitudinal waves, meaning their oscillations occur in the same direction as their propagation.
Correct answer: Polarized13689. The intensity of a wave is:
- A. Directly proportional to the amplitude
- B. Directly proportional to (amplitude)2
- C. Inversely proportional to amplitude
- D. Inversely proportional to (amplitude)2
Explanation: The intensity of a wave is directly proportional to the square of its amplitude (I∝A2).
Correct answer: Directly proportional to (amplitude)2- A. n/1 rad
- B. n/2 rad
- C. 2n/5 rad
- D. 4n/5 rad
Explanation: The phase difference between two points in a wave is given by the formula: ∆φ = 2π∆x/λ.
Correct answer: n/2 rad- A. Amplitude
- B. Wavelength
- C. Speed
- D. Frequency
Explanation: Amplitude of a wave is independent whereas speed wavelength and frequency are all depend on each other via the formulaSpeed = wavelength x…
Correct answer: Amplitude- A. I a = constant
- B. I/a2 = constant
- C. I a2 = constant
- D. I/a = constant
Explanation: The correct relationship between the intensity 'I' and the amplitude 'a' of a wave is option D: l/a2 = constant.
Correct answer: I/a2 = constant- A. 80Hz
- B. 800Hz
- C. 8000Hz
- D. 50Hz
Explanation: The reactance (XL) of an inductor is calculated using the formula XL=2πfL.
Correct answer: 80Hz- A. Orthogonal
- B. Supplementary
- C. Complementary
- D. Sum is 450
Explanation: Complementary angles are angles that add up to 90 degrees (e.g., 30 degrees and 60 degrees).
Correct answer: Complementary- A. R= V²sin∅ Cos∅/g
- B. R= V²i Sin ∅/2g
- C. R = V² Sin (2∅)/g
- D. R= V² i sin ∅ (2∅)/g
Explanation: The correct equation for the horizontal range of a projectile is: R = V²sin(2∅)/g where: R is the horizontal range of the projectile (the…
Correct answer: R = V² Sin (2∅)/g- A. circular path
- B. hyperbolic path
- C. straight line path
- D. parabolic path
Explanation: This option is correct. When a ball is dropped from a moving train, it follows a parabolic path.
Correct answer: parabolic path- A. 30°
- B. 45°
- C. 60°
- D. 90°
Explanation: improve the jumping record, the long jumper should jump at an angle of 45°.Here's why:Range of a projectile: The horizontal distance a…
Correct answer: 45°- A. A little above the bird
- B. A little below
- C. Exactly at the bird
- D. Very high
Explanation: When a hunter aims at a bird in a tree, they should aim a little above the bird.
Correct answer: A little above the bird- A. Zero
- B. Minimum
- C. Maximum
- D. In between maximum and minimum
Explanation: In projectile motion, the velocity of a projectile can be broken down into horizontal and vertical components.
Correct answer: Minimum- A. 0
- B. 1/2g, horizontally
- C. g, upward
- D. g, downward
Explanation: At the highest point of travel, the vertical velocity is zero but since the force of gravity still is acting on it, the acceleration is…
Correct answer: g, downward