Kerala (English Medium) Std 9 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
Carbon brushes are used in

(A) Electric motor	(B) Electromagnet
(C) Bar magnet	(D) None

Question-2
An electric generator actually act as a

(A) Source of electric charge	(B) Source of heat energy
(C) Electromagnet	(D) Converter of energy

Question-3
Electromagnets are used in

(A) Electric bells	(B) Telephone
(C) Dynamo	(D) All of these

Question-4
An insulated wire wound in the form of a helix with a large no of turns in

(A) A solenoid	(B) A toroid
(C) A galvenoscope	(D) Emulators

Question-5
The wire having black plastic covering is a

(A) Live wire	(B) Neutral wire
(C) Earth wire	(D) None

Question-6
SI unit of magnetic field is

(A) Tesla	(B) Volt
(C) Joule	(D) Ampere

Question-7
Which of the following device reverses the direction of flow of current through a circuit ?

(A) Commutator	(B) Rheostat
(C) Ammeter	(D) Voltmeter

Question-8
Which of the following device converts mechanical energy into electrical energy?

(A) Dynamo	(B) Electric motor
(C) Solenoid	(D) Ammeter

Question-9
The regions of concentrated magnetic strength inside the magnet just near its ends are

(A) Magnetic poles	(B) Magnetic field
(C) Magnetic Ends	(D) None of these

Question-10
The system where due to action of an electromagnet, a circuit is activated to control a second circuit is

(A) Electromagnetic relay	(B) Remote control
(C) Radar	(D) Electric bell

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Std 9

Kerala (English Medium)

Practice in Related Chapters
Magnetism and Electricity
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