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 667 of 697
- A. Two
- B. Three
- C. Four
- D. Five
Explanation: Consider a particle having just one line of force acting on it. This force results in acceleration of the particle disturbing its…
Correct answer: Two- A. Zero
- B. One
- C. Negative One
- D. Two
Explanation: The correct answer is 'One'. When two vectors each have unit magnitude, the dot product is calculated as the cosine of the angle between…
Correct answer: One13323. A vector of magnitude 20 is added to a vector of magnitude 25. The magnitude of this sum might be:
- A. Zero
- B. 3
- C. 12
- D. 45
Explanation: The magnitude of the sum of two vectors can be determined using the triangle law of vector addition.
Correct answer: 45- A. π/4
- B. π/2c
- C. 2π
- D. None of them
Explanation: Explaination for this question will be added shortly.
Correct answer: π/4- A. Solid cylinder
- B. Hollow cylinder
- C. Both simultaneously
- D. Depends upon the behavior among them
Explanation: mgcos∅ will get balanced by the normal force For rolling without slipping (pure rolling), we have a = àR ...
Correct answer: Solid cylinder13326. Diver curls his bosy when diving so that he can perform some quick somersaults. This is because:
- A. His angular momentum increases
- B. His effective radius increases
- C. his angular momentum decreases
- D. his angular velocity increases
Explanation: A) By the law of conservation of angular momentum, the total angular momentum of the diver will stay the same irrespective of the way the…
Correct answer: his angular velocity increases- A. w/r
- B. w2/r
- C. w2r
- D. wr2
Explanation: The formula for angular acceleration is a= = w2r RCentripetal acceleration = V2/r, whereby V=rW, thus (rW)2 / r is = w2 r
Correct answer: w2r- A. Fc = mv2/r
- B. Fc = (mv2/r)r̂
- C. Fc = (mv2/r2)r̂
- D. Fc = (mv2/r2)γ
Explanation: Magnitude of centripetal force Fc=mv2/rFor vector form, we multiply it with unit vector ^r to get Fc = (mv)2/r)^γ
Correct answer: Fc = (mv2/r)r̂- A. w/r
- B. w2/r
- C. w2r
- D. Wr2
Explanation: To find the centripetal acceleration of a particle moving in a circle, use the formula ac = w2r, where w is the angular speed and r is the…
Correct answer: w2r- A. 300%
- B. 100%
- C. 400%
- D. 200%
Explanation: To solve this problem, we start with the formula for centripetal force: F = (mv^2)/r.Initially, the force is F.
Correct answer: 100%- A. Zero
- B. 1.0 ms-2
- C. 2π ms-2
- D. 4π2 ms-2
Explanation: To find the magnitude of the acceleration of an object moving in a circle, we use the formula for centripetal acceleration: a = ω²r.
Correct answer: 4π2 ms-2- A. Zero
- B. 1.0 ms-2
- C. 2π2 ms-2
- D. 4π2 ms-2
Explanation: In this problem, the object is moving in a circular path with a constant speed.
Correct answer: 4π2 ms-213333. A body Is moving in a circle of radius (r) with a variable speed, the acceleration of the body is:
- A. Centripetal acceleration
- B. Tangential acceleration
- C. Angular acceleration
- D. All of the above
Explanation: Since the magnitude of the speed is not constant, this is a case of non-uniform circular motion and there will be a tangential…
Correct answer: All of the above- A. Torque
- B. Weight
- C. Moment of inertia
- D. Angular momentum
Explanation: Moment of inertia is referred to as the rotational analogue of mass in linear motion.
Correct answer: Moment of inertia- A. Increases
- B. Decreases
- C. Remains constant
- D. Changes direction but not magnitude
Explanation: Angular momentum is a conserved quantity in the absence of external torques.
Correct answer: Remains constant- A. 0.38 kg - m2
- B. 0.54 kg - m2
- C. 0.86 kg - m2
- D. 1.02 kg - m2
Explanation: The correct answer is 1.02 kg - m2. The initial rotational inertia of the disk is 0.70 kg m2.
Correct answer: 1.02 kg - m2- A. Mv2
- B. ½ Mv2
- C. ¼ Mv2
- D. 1/8 Mv2
Explanation: The kinetic energy of the rotating disc can be calculated as:KE = (1/2) I ω^2where I is the moment of inertia and ω is the angular…
Correct answer: ¼ Mv2- A. Mass of an object
- B. Mass of distribution
- C. Angular velocity
- D. Axis of rotation
Explanation: The moment of inertia Iof an object is a measure of its resistance to changes in angular velocity.
Correct answer: Angular velocity13339. The speedometer of a car shows 36 km/hr. The angular speed of the wheels having 0.5m radius is:
- A. 5 rad/sec
- B. 10 rad/sec
- C. 15 rad/sec
- D. 20 rad/sec
Explanation: To solve for the angular speed of the wheels, we first need to convert the car's speed from kilometers per hour to meters per second.
Correct answer: 20 rad/sec13340. Centrifugal force =
- A. mv^2/r
- B. m^2v/r
- C. mv/r^2
- D. mv2/r
Explanation: Centrifugal force (F_c) is an outward force that arises when an object moves in a circular path.
Correct answer: mv^2/r