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Q 1. A charge whenever in motion has
only magnetic field linked with it
only electric field linked with it
Both electric and magnetic field linked with it
only gravitational field linked with it.
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Q 2. Magnetic forces
are always attractive
are always repulsive
may be attractive or repulsive
none of these
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Q 3. Magnetic field is generated by
stone
mud
magnet
iron piece
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Q 4. A magnetic needle comes to rest in
geographic east-west direction
geographic North-South direction
Vertical direction
In North-East direction
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Q 5. The device used for producing electric current is called
generator
galvanometer
ammeter
motor
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Q 6. In an electric motor, conversion takes place of
Chemical energy into electrical energy
Electrical energy into mechanical energy
Electrical energy into light
Electrical energy into chemical energy
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Q 7. A magnet can be demagnetised by
Hammering the magnet
Putting it in the water
Cooling it
Putting in contact with iron
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Q 8. Which one of the following is the magnetic substance
Mercury
Iron
Gold
Silver
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Q 9. Generally permanent magnets are prepared from
Gold
Silver
Iron
Steel
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Q 10. If iron filings are sprinkled around a bar magnet then they arrange in a fixed pattern which is
magnetic field lines pattern
Electric field lines pattern
Faraday's electric field lines pattern.
None of these
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Q 11. A vertical wire is carrying current in the upward direction. Then the direction of magnetic field in the west direction will be
towards south
towards east
towards west
towards north
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Q 12. A charge of 1.6 {tex}\times{/tex} 10{tex}^{-19}{/tex} C enters in the magnetic field of 3 tesla normally with a velocity of 106 m/s. The force on the charge will be
4.8 {tex}\times{/tex} 10{tex}^{-12}{/tex} m/s
4.8 {tex}\times{/tex} 10{tex}^{-13}{/tex} m/s
4.8 {tex}\times{/tex} 10{tex}^{-14}{/tex} m/s
2 {tex}\times{/tex} 10{tex}^{-19}{/tex} m/s
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Q 13. The magnetic field due to an infinitely long wire carrying a current of 2A at a distance of 10 m from it is
2 {tex}\times{/tex} 10{tex}^{-8}{/tex} T
4 {tex}\times{/tex} 10{tex}^{-8}{/tex} T
4{tex}\pi{/tex} {tex}\times{/tex} 10{tex}^{-8}{/tex} T
2 {tex}\times{/tex} 10{tex}^{-6}{/tex} T
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Q 14. The device used for producing electric current is called a
generator
galvanometer
ammeter
motor
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Q 15. {tex}\mathrm{Assertion}{/tex}: A magnetic field is produced around a current carrying conductor.
{tex}\mathrm{Reason}{/tex}: This was experimentally proved by Oersted.
Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'
Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'
Assertion is true but Reason is false
Assertion is false but Reason is true
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Q 16. {tex}\mathrm{Assertion}{/tex}: A changed particle (+vely charged) when enters normally to the magnetic field follows an elliptical path.
{tex}\mathrm{Reason}{/tex}: The magnetic force on the charged particle provides the necessary centripetal force
Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'
Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'
Assertion is true but Reason is false
Assertion is false but Reason is true
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Q 17.
| Column I | Column II |
|---|---|
| (A) B = {tex}\frac{\mu_0}{4\pi}{/tex}{tex}\frac{2I}{r}{/tex} | (P) Force on a charged particle q moving with a velocity v in a magnetic field |
| (B) F = Bqv sin{tex}\theta{/tex} | (Q) Fleming's left-hand rule |
| (C) Force on a current carrying conductor | (R) r = {tex}\frac{mv}{qB}{/tex} in a magnetic field |
| (D) Radius of the circular path of a charged | (S) Magnetic field due to particle in a magnetic field an infinitely long wire. |
A - P
B - Q
C - Q
D - P
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Q 18. When North pole of magnetic approaches a circular coil, then the current in the coil as seen from the magnet side is
clockwise
anticlockwise
parallel
antiparallel
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Q 19. A vertical wire carries a current upward. The magnetic field north of the wire will be directed
upward
eastward
westward
northward
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Q 20. The magnetic flux is expressed in
dyne
Oested
Gauss
Weber
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Q 21. The magnetic field lines have which of the following properties
They are closed curves
Field lines don't intersect
Both A and B
None of the above
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Q 22. Which of the following are magnetic materials?
Gold
Iron
Steel
Both B and C
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Q 23. Magnetic field due to a current carrying solenoid on its axis is
constant
At ends B= {tex}\frac{\mu_0nI}{2}{/tex}
B = {tex}\mu_0{/tex}nI
All of the above
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Q 24. Lenz's law explains the following
direction of induced emf
direction of induced current
conservation of energy
All of the above
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Q 25.
| Column-I | Column-II (Devices) (Components used in given devices) |
|---|---|
| (A) Electric motor | (P) Current carrying conductors |
| (B) Electromagnet | (Q) Magnets |
| (C) AC Generator | (R) Commutator |
| (D) Loud speakers | (S) Brushes |
A - S
B - Q
C - P
D - R