GTHS ADIMALY

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GTHS ADIMALY

CLASS 10 UNIT TEST- PHYSICS SCORE 20
LESSON 2

Name of the student(correct name) *

Name of the school(correct name) *

1.Select the statement that is not belong to others in connection with electromagnet *

1 point

magnetism is temporary

polarity can be changed

change the magnetic strength

direction cannot be changed

all are correct

2.In the figure,direction of motion of the needle , *

1 point

clock wise

anticlockwise

no change in direction

south to east

3.In this picture ,fingers indicate the direction of , *

1 point

current

magnetic field

force

direction of motion of the conductor

all of them are same

4.If a right hand screw s rotated in such a way that its tip advances along the direction of the current in the conductor ,then the rotation of the screw gives the direction of the magnetic field around the conductor *

1 point

Right Hand thumb Rule

Motor Principle

Right Hand Screw Rule

Fleming,s Left hand Rule

5.Using the figure, find the direction of motion of magnetic field lines, *

1 point

away from us

towards us

out of the coil

none of these

all of them are correct

6.Factors that are not affecting the magnetic field are, *

1 point

number of turns of the coil

strength of the current

direction of current

Area of cross section of the coil

7.By using the picture find the pole of the solenoid *

1 point

south

north

no pole

none of these

8. Choose the most correct answers:Which is the principle based on this picture, and find the factors influence the direction of motion of the conductor *

1 point

Left Hand Rule,direction of current

Right Hand Hule,direction of magnetic field,direction of current

Right Hand Screw Rule,direction of current

Motor Principle,direction of current,direction of magnetic field

All are correct

none of these

9.In this picture, *

1 point

Thumb indictes the direction of force,middle finger indicates magnetic field

Thumb indicates magnetic field,fore finger indicates current,middle finger indicates force

Fore finger indicates magnetic field,thumb indicates force,middle finger indicates current

all are same

none of these

10. Choose the wrong answer.The motor principle is used in devices like, *

1 point

fan

DC generator

mixie

electirc motor

11.Split ring commutator is used in DC generator to, *

1 point

change rotation of motion

change direction of magnetic field

change direction of coil every half rotation

change direction of current

none of these

12.Which is the correct order of the sentences.1. diaphragm moves2. amplified electric signals reach the voicecoil 3.voice coil moves 4.sound reproduced *

1 point

1,2,3,4

2,3,1,4

3,1,4,2

4,3,2,1

13.Current flows through a solenoid ,intensity of magnetic field is more at, *

1 point

first end

last end

zero

same on all parts

very less at the ends

more at the middle

very high at the ends

14.Which of the following is not a part of moving coil loud speaker/ *

1 point

voice coil

split rings

diaphragm

soft iron core

connecting wire

15.Which is the polarity at the first end and the current is in clock wise or anti clockwise direction in that end ? *

1 point

north polarity, anti clockwise diection

north polarity and clokwise direction

south polarity and clockwise direction

south polarity and anticlockwise direction

polarity is same at both ends and direction of current is anti cockwise

polarity is same at both ends and direction of current is clockwise

none of these

16.Find the direction of current in the picture given.Which is the law used for finding direction *

1 point

from A to B, Flemings left hand rule

from B to A, Flemings left hand rule

from A to B, Motor principle

from B to A ,Motor principle

from B to A ,Maxwell's Right hand cork screw rule

from A to B ,Maxwell's Right hand cork screw rule

17.The picture represents a current carrying coil .Why is the coil kept in north south direction? *

1 point

to use the influence of earth's magnetic field ,and to move the compas needle freely

for not affecting earth's magnetic field and to move the compas freely

to use the influence of earth's magnetic field and for not moving the compass needle freely

for increasing the magnetic field and for not moving the compass freely

for reducing the magnetic field and for not moving the compass freely

18. A current carrying conductor is held in vertical direction. To get a clockwise magnetic field around the conductor, the current should be passed in the conductor: *

1 point

From right to left

From bottom to top

From top to bottom

From left to right

none of these

19.A current through a horizontal line flows from south to North direction. The direction of magnetic field line above it is, *

1 point

south

west

east

north

20.Direction of rotation of a coil in an electric motor is determined by using, *

1 point

Right Hand Thumb rule

Right Hand Screw Rule

Fleming's Left Hand Rule

Motor Principle

Prepared by Beena KA-GTHS ADIMALY

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