Online Unit test -Current Electricity & Magnetism (Grade-10)

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Attempt all the questions. 25 ×2 =50 marks

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1.An electric generator actually acts as …..

2 points

(a) a source of electric charge

(b) a source of heat energy

(d) a converter of energy

Clear selection

2. The device based on the principle of electromagnetic induction is…

2 points

(a) electric generator

(b) electric motor

(d) ammeter

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3. An electric motor……..

2 points

(a) generates electric energy

(b) generates mechanical energy

(d) converts electrical energy into mechanical energy

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4.Which of the following is most suitable for the core of the electromagnets? (b) soft iron...

2 points

(a) air

b) soft iron

d)Cu-Ni alloy

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5. The commercial unit of consumption of electrical energy is ...

2 points

(a) kW

(b) kWh

(d) W/s

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6. A dynamo converts…….

2 points

(a) electrical energy into mechanical

(b) chemical energy into electrical

(d) chemical energy into light

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7. The transfer is based on the principle of....

2 points

(a) mutual induction…

(b) motor effect

(d) none of them

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8.Kilowatt hour is the unit of……

2 points

(a) power

(b) consumption of electrical energy

(d) force

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9.Electric bulb converts electrical energy into..

2 points

la) sound energy

(b) mechanical energy

d)None of them

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10.The fact that current is associated with a magnetic field was discovered by....

2 points

a) Oersted

(b) Maxwell

(d) Ohm

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11. SI unit of induced current is….

2 points

(a) volt

(b) watt

(d) none of them

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12. Electric iron is based on the principle of…

2 points

(a) heating effect of current

(b) magnetic effect of current

(d) none of them

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13. By inserting á soft iron piece into a solenoid the strength of the magnetic field...

2 points

(a) increases

(b) decreases

(d) remains unchanged

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14. By increasing the number of turns in the coil, the strength of the magnet…

2 points

(a) decreases

(b) increases

(d) remains unchanged

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15. If the current in the core decreases, the strength of the magnetic field….

2 points

(a) decreases

(b) increases

(d) remains unchanged

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16. The phenomenon of electromagnetic induction was discovered by....

2 points

(a) Lenz

(b) Marwell

d)Faraday

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17. For making an electromagnet the best material for the case is..

2 points

(a) stainless steel

(b) soft iron

d) Nickel

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18. Electromagnets are used in....

2 points

(a) electriç bells

(b) telephones

(d) all the above

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19. When current is passed through an electric bulb, its filament glows, but the wire carrying our the balb does not glow because.....

2 points

.a)less electric current flow in the leading wire as compared to that in the filament

(b) the leading wire has more resistance than the filament.

(d) filament has coating of fluorescent material over it

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20. An electric buib is filled with….

2 points

(a) hydrogen

(b) oxygen and hydrogen

(d) nitrogen and argon

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21.A rectangular coil is kept in a uniform magnetic field with its plane in the direction of magnetic field. The magnetic flux liked with the coils is.....

2 points

(a) zero

(b) maximum

c) Either zero or maximum

(d) neither zero nor maximum

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22.The direction of induced current is obtained by…

2 points

(a) Fleming's left hand rule

b) right hand thumb rule

(b) clock rule

(d) Fleming's right hand rule

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23.Which of the following has its working based on electromagnetic induction…

2 points

a)d.c.motor

(b) a.c. generator alone

C )transformer alone

(d) both a.c. generator and transformer

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24.In a step up transformer….

2 points

a)Ns =Np

b)Ns< Np

c)Ns>Np

(d) nothing can be said

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25.When current flows in a wire, it creates….

2 points

a) An electric field outdide

(b) a magnetic field around it

(d) neither the electric field nor the magnetic

Option 5

Clear selection

Best up Luck

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