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

Question-1
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-2
The depletion layer in the PN junction region is caused by

(A) Drift of holes	(B) Diffusion charge carriers
(C) Migration of impurity atoms	(D) Drift of electrons

Question-3
The wire having black plastic covering is a

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

Question-4
choose the wrong statement

(A) Magnetic poles exist in pairs	(B) Magnetic poles have equal strength
(C) like poles repel each other	(D) Unlike poles repel each other

Question-5
Which of the following device converts mechanical energy into electrical energy?

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

Question-6
Carbon brushes are used in

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

Question-7
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

Question-8
Electromagnets are used in

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

Question-9
The charged body at rest produces

(A) Electric field	(B) Magnetic field
(C) Neither A or B	(D) Both A & B

Question-10
The safety device to protect an electric circuit from overloading or short circuiting is

(A) Earthing	(B) Electric fuse
(C) Magnetic induction	(D) Electrolysis

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Std 9

Kerala (English Medium)

Practice in Related Chapters
Magnetism and Electricity
Motion
Refraction of Light
Gravitation
Work,Energy and Power
Electricity
Wave Motion
Forces of Fluids