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 668 of 697
- A. Angular acceleration
- B. Centripetal acceleration
- C. Tangential acceleration
- D. Translator acceleration
Explanation: Radial acceleration, also known as centripetal acceleration, is the acceleration of an object moving in a circular path towards the center…
Correct answer: Centripetal acceleration- A. 2π radians
- B. π radians
- C. 270 degrees
- D. 180 degrees
Explanation: The circumference covers the entire length of the circle, so the angle subtended by it must be equal to the maximum angle in the circle…
Correct answer: 2π radians- A. 30 degrees
- B. 120 degrees
- C. 180 degrees
- D. 360 degrees
Explanation: In a full hour, the minute hand of a watch completes a 360-degree rotation, which is equivalent to 2π radians.
Correct answer: 30 degrees- A. 180 degrees
- B. 360 degrees
- C. 540 degrees
- D. 720 degrees
Explanation: A full turn around a circle is 360 degrees or 2π radians. For two complete turns, multiply the angle of one turn by 2, resulting in 720…
Correct answer: 720 degrees- A. 2 rad
- B. 1 rad
- C. 2π rad
- D. None of the above
Explanation: When an object is revolving in a circular path with a radius of 2m and it travels along an arc of length 4m, we can calculate the angle…
Correct answer: 2 rad- A. 100
- B. 20π
- C. 0
- D. 20
Explanation: To determine the angle described by the shaft in radians in one second, we first need to convert the rotational speed from revolutions per…
Correct answer: 20π- A. Decrease
- B. Increase
- C. Remain the same
- D. First increase and then decrease
Explanation: According to conservation of Angular Momentum, Iω = constant Hence, when the girl sitting on a bar stool suddenly spreads her hands, then…
Correct answer: Decrease- A. decrease
- B. increase
- C. Remain the same
- D. first increase and then decrease
Explanation: The moment of inertia of girl increases (since the mass of her legs is now farther from the axis of rotation).
Correct answer: decrease- A. π/3 radian hr-1
- B. π/6 radian hr-1
- C. π/12 radian hr-1
- D. 12 radian hr-1
Explanation: The angular velocity (ω) is the scalar measure of rotation rate. In one complete rotation, angular distance travelled is 2π and time is…
Correct answer: π/12 radian hr-1- A. π rad/sec2
- B. 2π rad/sec2
- C. π/2 rad/sec2
- D. None of the above
Explanation: Angular acceleration (α) is defined as the change in angular velocity (ꞷ) per unit time.
Correct answer: None of the above- A. The tangent to the circular path
- B. The axis of rotation
- C. The outward radius
- D. The inward radius
Explanation: When an object rotates, it has an axis around which it spins. The direction of the angular velocity vector is parallel to this axis of…
Correct answer: The axis of rotation- A. π/12 radian/hour
- B. 12π radian/hour
- C. 24π radian/hour
- D. π/24 radian/hour
Explanation: The correct answer is π/12 radian/hour. To find the angular speed in radians, we recognize that one full rotation (2π radians) occurs in…
Correct answer: π/12 radian/hour- A. (∏/1800) rad/sec
- B. (∏/60) rad/sec
- C. (∏/30) rad/sec
- D. (2n) rad/sec
Explanation: The correct answer is (π/30) rad/sec. The second hand of a watch completes one full revolution (2π radians) in 60 seconds, which means its…
Correct answer: (∏/30) rad/sec- A. Neon
- B. Nitrogen
- C. Helium
- D. Oxygen
Explanation: A tube containing charged electrodes and filled with a gas in which ionization is induced by an electric field.
Correct answer: Helium- A. The radius of the orbits are integral multiple of the Bohr-radius ...... 0.053mm
- B. The angular momentum is n times h/2π
- C. The energy in the nth-orbit is n times the ground state energy.
- D. Missing
Explanation: This option is correct as the angular momentum is n times h/2pi which is given by the formula : L=nh/2pi or mvr=nh/2pi which is stated in…
Correct answer: The angular momentum is n times h/2π- A. 8
- B. 4
- C. 6
- D. 10
Explanation: The transition of a hydrogen atom from the ground state to an energy level characterized by n = 4 corresponds to an electron moving from…
Correct answer: 6- A. 10^-35 sec
- B. 10^-8 sec
- C. 10^-3sec
- D. 0.1 sec
Explanation: The lifetime of an ordinary excited state refers to the time it takes for an atom or molecule to transition from the excited state back to…
Correct answer: 10^-8 sec- A. 10^3
- B. 10^5
- C. 100
- D. 10^8
Explanation: This option corresponds to the correct answer, indicating a much longer lifetime for an electron in a metastable state compared to an…
Correct answer: 10^8- A. Torrielll's effect
- B. Bernoulli's effect
- C. Venturis effect
- D. Doppler effect
Explanation: Bernoulli's principle states that as the speed of a fluid increases, the pressure exerted by the fluid decreases.
Correct answer: Bernoulli's effect13360. Water flows through a constriction in horizontal pipe as it enters the constriction, the water's:
- A. Speed increases and pressure remains constant
- B. Speed increases and pressure increase
- C. Speed increases and pressure decreases
- D. Speed decreases and pressure Increases
Explanation: We know that the volume flow rate (Avt) is constant, with V/v = A, we know that Area is directionally proportional to velocity.
Correct answer: Speed increases and pressure decreases