All Free Physics MCQs with Answers

• A. Heavy body
• B. Light body
• C. Both have same momentum
• D. None of these

Explanation: Heavy body: Momentum is given by the product of mass and velocity. Since the heavy body has a larger mass, even if the kinetic energies…

• A. Acceleration
• B. Energy
• C. Force
• D. Impulse

Explanation: The unit of momentum is kg.m/s and the unit of mass is kg, so the unit of Pm would be kg2.m/s.

• A. Wire in a helix around a box
• B. Wire in a helix around a cylindrical surface
• C. Wire in a helix on a plain surface
• D. Cannot be made using wire

Explanation: A solenoid is an instrument that consists of copper coiling over a cylinder designed to create a strong magnetic field inside the coil…

• A. 1N
• B. 1/2 N
• C. 1/3 N
• D. 1/4 N

Explanation: Answer; B (Answer should be A) F=BILsintheta theta= 90° F= 0.5× 2× 1× sin90 = 1 N

• A. will attract each other
• B. will repel each other
• C. will have no effect on each other
• D. None of the above

Explanation: If two parallel wires carry current in opposite directions, they repel each other, whereas if two parallel wires carry current in the same…

• A. B = µ°NI ℓ
• B. B = µ ℓ / °Nℓ
• C. B = Nℓ / °ℓ
• D. B = µ ℓ ℓ / °N

Explanation: According to Ampere's law, the magnetic field (B) produced inside a solenoid is directly proportional to the product of the permeability…

• A. 1.2N
• B. 3 dynes
• C. 10^7 dynes
• D. 10^5 dynes

Explanation: This option is correct as 10^7 dynes are equal to 100N. The force can be calculated by: F = BILsinθ In this case, the cylinder is carrying…

• A. Attracted by poles
• B. Attracted by North pole & repelled by south pole
• C. Attracted by south pole & repelled by North pole
• D. Repelled by the poles

Explanation: Diamagnetic substances are those that do not have unpaired electrons in their atoms.

• A. Magnetic flux
• B. Magnetic flux density
• C. Magnetic permeability
• D. None of these

Explanation: The force exerted on a wire of length one meter carrying a current of one ampere lying normal to the magnetic field is called magnetic…

• A. 10A
• B. 50A
• C. 100A
• D. 500A

Explanation: Given that:Length = L = 10cm = 10 × 10-2 mMagnetic field = B = 0.5TForce = F = 5NCurrent = I =?The force experienced by a current-carrying…

• A. attract each other
• B. repel each other
• C. have no force of attraction or repulsion
• D. remain stationary

Explanation: Parallel wires with current in the same direction exert attractive forces on eachother.

• A. 2 x 10^-5N to the left
• B. 3 x 10^-5N to the right
• C. 5 x 10^-5N to the right
• D. 5 x 10^-5N to the left

Explanation: Two parallel current carrying wires experience equal, but opposite magnetic force.

• A. Hysteresis
• B. Ferromagnetism
• C. The Curie law
• D. Gauss's law for magnetism

Explanation: Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align…

• A. Surface
• B. Closed surface
• C. Path
• D. Closed path

Explanation: Ampere's law states that the total magnetic field (B) induced around any closed path is equal to the ratio of the total current passing…

• A. NmA-1
• B. Nm2 A-1
• C. NAm-¹
• D. NmA-2

Explanation: The unit of magnetic flux is Weber, which is equal to J/A, which is then equal to Nm/A-1.

• A. gauss
• B. weber
• C. henry
• D. tesla

Explanation: Henry is the unit of inductance, which is equal to 1 volt*sec/ampere, which is the voltage across a conductor directly proportional to the…

• A. μ0N2AL
• B. μ0N2 A/L
• C. μ0N2L/A
• D. μ0NL/A

Explanation: The formula for self-inductance of a solenoid is L=μoN2A/L

• A. Resistance
• B. Conductance
• C. Inductance
• D. Capacitance

Explanation: The reluctance of a ferromagnetic material is similar to the resistance of a conductor.

• A. Electric potential
• B. Electric intensity
• C. Magnetic intensity
• D. Magnetic flux

Explanation: The weber (Wb) is the unit of magnetic flux, which is a measure of the amount of magnetic field that passes through a given area.

• A. Lead
• B. Steel
• C. Iron
• D. Copper

Explanation: Lead is commonly used as a shield against X-rays due to its high density and high atomic number.