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- 1. Multiple Choice
The magnetic field inside a long straight solenoid carry
ing current is
Zero
decreases as we move towards its end
increases as we move towards its end
the same at all points
- 2. Multiple Choice
Which of the following property of Proton can change while it moves freely in a magnetic field?
mass
speed
velocity & momentum
momentum
- 3. Multiple Choice
A negatively charged particle projected towards west is deflected towards North by a magnetic field. The direction of magnetic field is:
Towards south
Towards East
Downward
upward
- 4. Multiple Choice
Fleming left hand rule gives the direction of:
Magnetic field
Current
Induced Current
Motion (Force)
- 5. Multiple Choice
Fleming right hand rule gives the direction of :
Force
Current
Induced current
Magnetic field
- 6. Multiple Choice
Which of the following is the source of direct current:
Car battery
Car alternator
Power house generator
- 7. Multiple Choice
A rectangular coil copper wires is rotated in a magnetic field. The direction of the induced current changes once in each:
Two revolution
One revolution
Half revolution
One-forth revolution
- 8. Multiple Choice
The magnetic field lines near a long straight wire carrying current are:
Straight lines
Concentric rings
Spiral lines
Radial lines
- 9. Multiple Choice
The device used for producing current is called a:
Galvanometer
Ammeter
Motor
Generator
- 10. Multiple Choice
Which of the following is not the source of magnetic field:
Moving charge
Electric current
Magnet
A small piece of iron
- 11. Multiple Choice
Name the device which converts mechanical energy into electric energy
Motor
Generator
Heater
Transformer
- 12. Multiple Choice
The direction of magnetic field lines inside the magnet are:
From North to south
From south to north
From North to North
From South to South
- 13. Multiple Choice
Magnetic field is maximum:
At Two Poles
At one pole
At The center of the magnet
Outside the magnet
- 14. Multiple Choice
What is the pattern of magnetic field lines at the center of a current carrying solenoid:
Concentric rings
Straight lines
Curved lines
Radial lines
- 15. Multiple Choice
What is the role of split rings in a electric moter
Convert A.C. into D.C.
Convert D.C. INTO A.C.
Reverse the direction of Current
Increases the current
- 16. Multiple Choice
Force experienced by a current carrying conductor placed in a magnetic field is
Perpendicular to its length
Perpendicular to its magnetic field
Perpendicular to its length & magnetic field
Perpendicular to its width
- 17. Multiple Choice
According to right hand thumb rule the direction of magnetic field in a current carrying straight conductor is denoted by:
Thumb
Curl fingers
Middle finger
First finger
- 18. Multiple Choice
According to right hand thumb rule the direction of magnetic field in a current carrying circular coil is denoted by
Thumb
Middle finger
Curl finger
First finger
- 19. Multiple Choice
Who discovered Magnetic Effect of Current:
Faraday
Fleming
Newton
Oersted
- 20. Multiple Choice
The frequency of direct current is
0 Hz
50 Hz
60 Hz
100 Hz
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