2nd Year Physics Chapter 14 Online MCQ Test for 12th Class Physics Chapter 14 (Electromagnetism)

The unit of permiability of free space is:

• T.m/A A
• T.m²/A B
• T.m/A² C
• None of these D

Magnetic lines of force are.

• Imaginary A
• Real B
• Perpendicular C
• In phase with electric lines of force D

Useful device to measure resistance, current and voltage is an electronic instrument called.

• Volt meter A
• Ammeter B
• Ohmmeter C
• Digital Multimeter D

An electron enters the magnetic field at right angle from left, B is into paper. The electron will be deflected.

• upward A
• To ward right B
• Down ward C
• Toward left D

Shunt resistance is

• Low resistance A
• Zero resistance B
• High resistance C
• Impedance D

If the length of solenoid is doubled but N same, B inside the solenoid becomes.

• Half A
• Doubled B
• One fourth C
• Four times D

CRO works by deflecting the beam of electron as they pass through

• Uniform magnetic field A
• Uniform electric field between two sets of parallel plates B
• Non-uniform magnetic field C
• None of these D

Brightness of screen of CRO controlled by

• Grid A
• Filament B
• Anode C
• Cathode D

• 
  A
• 
  B
• 
  C
• None of the above D

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

• Half A
• Double B
• Remain same C
• Zero D

Lorentz force means the force acting on a particle, which is

• Magnetic force only A
• Electric force only B
• Sum of electric and magnetic force C
• None of these D

A soft iron cylinder is placed  inside coil galvanometer to:

• Make field circular and strong A
• Make field radial and weak B
• Make field radial and strong C
• All of above D

A charged particle enters in a strong magnetic field its K.E.

• Remain constant A
• Increases B
• Decreases C
• Increases then decreases D

For  accurate measurement of current through a circuit, the resistance of ammeter should be

• Very small A
• Very high B
• Neither small nor high C
• None of the above D

To convert a galvanometer into an ammeter, we connect with it a

• Shunt resistance A
• Low value parallel B
• Low value by pass resistor C
• All of above D

Cathode ray oscilloscope works by deflecting a beams

• Neutrons A
• Protons B
• Electrons C
• Positron D

A dot represents the direction of magnetic field.

• Out of page A
• Into the page B
• Tangent to page C
• Parallels to page D