Class10th Physics Chapter 15


Total Marks: 30

1. Which statement is true about the magnetic poles?
Unlike poles repel Like poles attract Magnetic poles do not effect each other A single magnetic pole does not exist
2. What is the direction of the magnetic field lines due to a bar magnet?
From north pole to south pole From south pole to north pole From side to side There are no magnetic field lines
3. The presence of a magnetic field can be detected by a
Small mass Stationary positive charge Stationary negative charge Magnetic compass
4. If the current in a wire which is placed perpendicular to a magnetic field increases the force on the wire
Increase Decreases Remains the same Will be zero
5. A D.C motor converts
Mechanical energy into electrical energy Mechanical energy into chemical energy Electrical energy into mechanical energy Electrical energy into mechanica
6. Which part of a D.C motor reverses the direction of current through the coil every half-cycle?
The armature The commutator The brushes The slip rings
7. The step-up tranformer
Increases the input current ncreases the input voltage Has more turns in the primary Has less turns in the secondary
8. An induced current will flow through a coil when the magnet and the coil are
At rest In relative motion Very close to each other Far from each other
9. If you change the direction of movement of the magnet in the coil, will the induced current flow?
In the same direction In the opposite direction In any direction None of these
10. The direction of the induced emf in the circuit is in accordance with which conservation law ?
mass charge momentum energy
11. Michael Faraday belong to :
England United States Saudi Arab Russia
12. Which things work on the principle of electromagetic induction in hydro electric power house ?
Motor Generator Gelvonic cell Voltic Cell
13. Introduced the laws of electromagnetic induction and electrolysis?
Simon Ohm George Columb Newton Michael Faraday
14. What is the study of the magnetic effect of current called?
Electricity Electromagnetism Magnetism Electric capacity
15. The presence of magnetic filed can be detected by a
Small mass Statinoary positive charge Statinoary negative charge Magnetic compass
16. The magnetic effect of current was first discovered by :
Ohm Oersted Faraday None of these
17. We can trace the lines of force by any conductor with the help of :
Bar magnet Magnet Compass needle Electric needle
18. The direction of magnetic lines of force around a current carrying conductor is found by
Lens law Fleming\'s left-handed law Right hand grip rules All above
19. The transformer only works
On AC On DC Both a,b None of these
20. Transformer works on this principle
Mutual induction Self induction The law of lenses Faraday\'s law
21. Transformer has coils
2 3 1 4
22. The input voltage is applied to the transformer
Primary coil Secondary coil Both coils None of these
23. In ideal transformer ,which quantity remains constant :
Voltage power Current both a,b
24. Transformer is used for
voltage Work energy charge
25. Step up transformer is used for
increase resistance increase voltage Decrease voltage Both a and b
26. Which device is based on the principle of electromagnetism?
Electric motor T.V C.D Mobile phone
27. A device which converts electrical energy into mechanical energy is called
D.C motor Generator Transformer All of these
28. A device which convert mechanical energy into electrical energy .
Transformer D.C motor A.C Generator Electroscope
29. Michael faraday belonged to ____________ .
British U.S.A K.S.A Russia
30. Which thing works in the the principle of electromagnetic induction in hydro electric power house ?
Motor Generator Galvanic cell Voltic cell