All Free Physics MCQs with Answers

• A. 44%
• B. 36%
• C. 28%
• D. 20%

Explanation: Momentum p = mvIf momentum is decreased by 20%, the resulting new value is 80% of the original p-p'P - 0.2p = mv - m0.2vP - 0.2p = (m) (v)…

• A. 4800 J
• B. 3500 J
• C. 1200 J
• D. 120 J

Explanation: To find the kinetic energy of the block when it has fallen 60m, we need to calculate the change in potential energy as it falls.

• A. Weighs more than P
• B. Is moving faster than P
• C. Weighs the same as P
• D. Is moving slower than P

Explanation: To determine which object has more kinetic energy when two objects have the same momentum, examine their speeds.

• A. His height above the ground
• B. His mass
• C. Elevator's speed
• D. Elevator's direction of movement

Explanation: The primary factor that determines the man's kinetic energy is the elevator's speed.

• A. Smaller
• B. Same
• C. Greater
• D. Zero

Explanation: The gravitational constant G is a fundamental constant of nature that expresses the strength of gravitational attraction between two…

• A. 72 kg
• B. 12kg
• C. 24 kg
• D. 0kg

Explanation: The weight of an object on the surface of the moon can be calculated using the formula:Weight on the moon = Weight on the Earth×…

• A. [M2L2T]
• B. [M-1L3T-2]
• C. [M2L-2T-2]
• D. [ML-2T-1]

Explanation: The dimensions of the gravitational constant can be expressed using the equation for Newton's law of universal gravitation:F = Gm1m2 /…

• A. 1/2
• B. 1
• C. 2
• D. No fixed number

Explanation: Inertial mass is a measure of how fast an object accelerates--given the same force, increasing the inertial mass implies decreasing…

• A. The mass of a body
• B. The mass of the planet
• C. The average radius of the planet
• D. The density of the planet

Explanation: The escape velocity 'v' of a body depends upon the acceleration due to gravity of the planet and the radius of the planet but not on mass…

• A. Less than 400 N
• B. Less than 500 N
• C. Equal to 500 N
• D. Zero

Explanation: When the same object is taken to a point located at a higher altitude, the weight of the person will be less than 400 N.

• A. GmMe/Re^2
• B. GMe/Re
• C. GmMe/2Re
• D. -GMe/Re

Explanation: The absolute potential energy (U) of an object, such as a spaceship, on the surface of the Earth can be calculated using the formula:U =…

• A. resotoring torque
• B. defelection torque
• C. back motor effect
• D. all of these

Explanation: When the current I passes through the coil, the coil experiences torque, which rotates the coil through an angle alpha.

• A. Charge
• B. Current
• C. Energy
• D. Magnetic field

Explanation: Lenz's law exemplifies the law of conservation of energy. It states that the induced electromotive force (emf) in a closed loop will…

• A. Ohm's law
• B. Coulomb's law
• C. Lenz's law
• D. Newton's law of motion

Explanation: Lenz's law of electromagnetic induction states that the direction of the current induced in a conductor by a changing magnetic field is…

• A. Law of conservation of current
• B. Law of conservation magnetization
• C. Law of conservation of charges
• D. Law of conservation of energy

Explanation: Lenz's Law is a fundamental principle in electromagnetism. It states that when there is a change in the magnetic field through a…

• A. 1/2m( vf2 -vi2 )
• B. Δt/ma
• C. m(vf-vi)/Δ t
• D. Mass

Explanation: According to Newton's 2nd law F=ma Putting a= vf-vi/∆t F= m(vf-vi)/∆t Solving this ahead F=mvf-mvi /∆t we know Momentum = mv So mvf =…

• A. 8 sec
• B. 30 sec
• C. 60 sec
• D. 120 sec

Explanation: According to Newton's second law, Force is the rate of change of momentum i.e: F=∆p/∆t Since; F= 2NChange in momentum (∆p)= 120 kg…

• A. A force applied
• B. A change in time
• C. A change in distance
• D. A change in temperature

Explanation: Fact. According to Newton's second law of motion, force is the rate of change of momentum i.e: F = d p/dt And hence a force acting for a…

• A. 300%
• B. 100%
• C. 50%
• D. 200%

Explanation: Let kinetic energy = E and momentum = pE=p²/2m Let initial kinetic energy, E1=EFinal kinetic energy.

• A. Increases
• B. Decreases
• C. Remains constant
• D. None of the above

Explanation: Initially the shell will be stationary and hence have zero momentum. After explosion the fragments of shell will fly apart in different…