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Question 1 of 30
1. Question
Assertion: Steel core is used as an electromagnet.
Reason: Steel gets permanently magnetised when the current flows through the coil wound around.CorrectIncorrect -
Question 2 of 30
2. Question
Magnetic lines of force inside current carrying solenoid are
CorrectIncorrect -
Question 3 of 30
3. Question
What should be the core of an electromagnet?
CorrectIncorrect -
Question 4 of 30
4. Question
Who has stated the Right hand Thumb Rule?
CorrectIncorrect -
Question 5 of 30
5. Question
The device used for producing electric current is called
CorrectIncorrect -
Question 6 of 30
6. Question
To convert an AC generator into DC generator
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Question 7 of 30
7. Question
The most important safety method used for protecting home appliances from short circuiting or overloading is
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Question 8 of 30
8. Question
A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is:
CorrectIncorrect -
Question 9 of 30
9. Question
If the current values periodically from zero to a maximum value, back to zero and then reverses its direction, the current is
CorrectIncorrect -
Question 10 of 30
10. Question
We can induce the current in a coil by
CorrectIncorrect -
Question 11 of 30
11. Question
Forces acting on a stationery charge of in the magnetic field B is
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Question 12 of 30
12. Question
A current through a horizontal power line flows from south to North direction. The direction of magnetic field line 0.5m above it is
CorrectIncorrect -
Question 13 of 30
13. Question
A D.C generator works on the principle of
CorrectIncorrect -
Question 14 of 30
14. Question
A soft iron bar is introduced inside the current carrying solenoid. The magnetic field inside the solenoid
CorrectIncorrect -
Question 15 of 30
15. Question
In the domestic electric circuits, the red coloured insulated copper wire is called
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Question 16 of 30
16. Question
When current is parallel to magnetic field, then force experience by the current carrying conductor placed in uniform magnetic field is
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Question 17 of 30
17. Question
The factors on which one magnetic field strength produced by current carrying solenoids depends are
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Question 18 of 30
18. Question
In electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called
CorrectIncorrect -
Question 19 of 30
19. Question
A positively charged particle say an alpha particle projected towards west is deflected toward north by a magnetic field. The direction of the magnetic field is
CorrectIncorrect -
Question 20 of 30
20. Question
The instrument that use to defect electric current in the circuit is known as
CorrectIncorrect -
Question 21 of 30
21. Question
A positive charge is moving upwards in a magnetic field directed towards north. The particle will be deflected towards
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Question 22 of 30
22. Question
At the time of short circuit, the current in the circuit
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Question 23 of 30
23. Question
The magnetic field near a long straight wire is described by
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Question 24 of 30
24. Question
By which instrument, the presence of magnetic field be determined?
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Question 25 of 30
25. Question
Inside the magnet, the field lines moves
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Question 26 of 30
26. Question
Assertion: It is fatal to touch a live electric wire as the person gets a severe electric shock. In some cases, electric shock can even kill a person.
Reason: The electric current passes through the body to the earth forming a circuit and bums the blood.CorrectIncorrect -
Question 27 of 30
27. Question
Assertion: Strength of an electromagnet depends on the magnitude of current flowing through them.
Reason: Electromagnets are majorly used for lifting heavy weights.CorrectIncorrect -
Question 28 of 30
28. Question
Which device produces the electric current?
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Question 29 of 30
29. Question
The essential difference between A.C. generator and a D.C. generator is that
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Question 30 of 30
30. Question
Commercial electric motors do not use
CorrectIncorrect