Electromagnetism mcqs

1. : Spots are formed on the screen in a cathode ray oscilloscope by
(A) Anode
(B) Cathode
(C) Matrix
(D) Grid

2. : The quantity that is not affected by a magnetic field is
(A) Moving charge
(B) Change in magnetic flux
(C) Current flowing in a conductor
(D) Stationary charge

3. : The device used to measure the potential difference between two points in volts is called a
(A) Ohmmeter
(B) Odometer
(C) Ammeter
(D) Voltmeter

4. : When a charged particle moves at right angles to a magnetic field, the quantity that changes is called
(A) Momentum
(B) Speed
(C) Energy
(D) Moment of inertia

5. : The cathode ray oscilloscope displays a graph of waveforms based on which of the following
(A) Current
(B) Temperature
(C) Potential difference
(D) Voltage

6. : The magnetic field inside a solenoid is
(A) Zero
(B) Weak
(C) Uniform
(D) Non-uniform

7. : A magnetic field is set up in a region of a current-carrying
(A) Rod
(B) Wire
(C) Block
(D) Plate

8. : The electric instrument used to measure current in amperes is known as
(A) Odometer
(B) Voltmeter
(C) Ohmmeter
(D) Ammeter

9. : When an electron is projected at right angles to a uniform magnetic field, it will move along a
(A) Helical path
(B) Circle
(C) Straight line
(D) Cube

10. : A moving charge experiences a magnetic force because of
(A) Magnetic flux
(B) Magnetic field
(C) Magnetic current
(D) None of the above

11. : In a moving coil galvanometer, the pole faces of the U-shaped magnet are made concave to
(A) Make the field radial
(B) Increase the field
(C) Weaken the field
(D) Both A and B

12. : In a moving coil galvanometer, a soft iron cylinder is placed inside the coil to
(A) Make zero field
(B) Make stronger field
(C) Make the galvanometer heavier
(D) Both A and B