Science- Physics- Magnetic Effects of Electric Current

1.

Who has stated the Right hand Thumb Rule?

Orsted Fleming Einstein Maxwell

2.

What should be the core of an electromagnet?

soft iron hard iron rusted iron none of above

3.

The most important safety method used for protecting home appliances from short circuiting or overloading is

earthing use of fuse use of stabilizers use of electric meter

4.

To convert an AC generator into DC generator

split-ring type commutator must be used slip rings and brushes must be used a stronger magnetic field has to be used a rectangular wire loop has to be used

5.

The strength of magnetic field inside a long current carrying straight solenoid is

more at the ends than at the centre minimum in the middle same at all points found to increase from one end to the other

6.

Commercial electric motors do not use

an electromagnet to rotate the armature effectively large number of turns of conducting wire in the current carrying coil a permanent magnet to rotate the armature a soft iron core on which the coil is wound

7.

For a current in a long straight solenoid N-pole and S-pole are created at the two ends. Among the following statements, the incorrect statement is [NCERT Exemplar Problems]

The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid. The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil. The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet. The N-pole and S-pole exchange position when the direction of current through the solenoid is reversed.

8.

concentric circles elliptical in shape straight lines parallel to each other concentric circles near the point O but of elliptical shapes as we go away from it [NCERT Exemplar Problems]

9.

Overloading is due to

Insulation of wire is damaged fault in the appliances accidental hike in supply voltage All of the above

10.

Which among of these are the main characteristics of fuse element?

High conductivity low melting point do not bum due to oxidation All of the above

Science- Physics- Magnetic Effects of Electric Current

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Answer: Option B

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Science- Physics- Magnetic Effects of Electric Current

Answer & Solution

Answer: Option B

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Answer & Solution

Answer: Option B

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Answer: Option B

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Answer: Option B

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Answer & Solution

Answer: Option B

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Congratulations

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