Electromagnetic Induction and Electric Motor
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Explain electromagnetic induction and working of electric motor and generator
SubtopicExplain electromagnetic induction and working of electric motor and generator under Electromagnetic Induction and Electric Motor for Grade 10 CBSE.
Preview questions (no answers)
- 1.
In an electric motor, the force on the conductor depends on:
A.Only current
B.Only magnetic field
C.Both current and magnetic field
D.Neither current nor magnetic field
- 2.
What is the shape of a magnetic field produced by a current-carrying straight wire?
A.Straight lines
B.Concentric circles
C.Parabolic
D.Elliptical
- 3.
The rule used to determine the direction of magnetic field around a straight current-carrying conductor is:
A.Fleming's Left-Hand Rule
B.Fleming's Right-Hand Rule
C.Right-Hand Thumb Rule
D.Lenz's Law
- 4.
Which of the following describes the function of slip rings in an AC generator?
A.To reverse current every half cycle
B.To maintain constant electrical contact while rotating
C.To stop the rotation
D.To increase the resistance
- 5.
The use of an electromagnet instead of a permanent magnet in a motor is to:
A.Make the motor cheaper
B.Increase the strength of the motor
C.Reduce the weight of the motor
D.Make the motor run on DC only
- 6.
If a magnet is moved very slowly into a coil, the deflection in the galvanometer will be:
A.Small
B.Large
C.Zero
D.Constant
- 7.
The principle of an electric motor is based on:
A.Magnetic effect of electric current
B.Heating effect of electric current
C.Chemical effect of electric current
D.Electromagnetic induction
- 8.
If a coil is rotated in a magnetic field, the time interval between two successive instances of maximum induced EMF is:
A.The period of rotation
B.C.D. - 9.
Why is the voltage of electricity generated at a power station stepped up before transmission?
A.To increase the current for the consumers
B.To reduce the power loss due to heating () in cables
C.To increase the frequency of the AC
D.To ensure the current is DC during transmission
- 10.
A DC motor operates on the principle that:
A.A conductor moving in a magnetic field experiences an induced EMF
B.A current-carrying conductor in a magnetic field experiences a force
C.A changing magnetic field induces a current in a stationary loop
D.Electric current produces a magnetic field
Download the worksheet for Electromagnetic Induction and Electric Motor - Explain electromagnetic induction and working of electric motor and generator to practice offline. It includes additional chapter-level practice questions.