Tag: physics

Questions Related to physics

When the north pole of a bar magnet picks up an iron nail which of the following are induced in the nail ?

physics fun with magnets let's make a magnet making magnets making and handling magnets

  1. North poles

  2. South poles

  3. A north pole and south pole

  4. None of these

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Correct Option: B
Explanation:

As the attraction occurs only in between two unlike poles, thus north pole of magnet induces south pole in the nail and north at the other end.

The force with which a magnet attracts objects like iron is called Magnetic force.

physics fun with magnets let's make a magnet making magnets making and handling magnets

  1. True

  2. False

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Correct Option: A
Explanation:

Magnetic force

All magnetic materials lose their magnetic properties when:

physics fun with magnets let's make a magnet making magnets making and handling magnets

  1. Dipped in water

  2. Dipped in oil

  3. Brought near a piece of iron

  4. Strongly heated

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Correct Option: D
Explanation:
Curie- Temperature:
The temperature at which any magnetic field material loses its magnetic property which is at a much higher temperature thus being strongly heated,
Magnets can be demagnetized.

Identify when the magnet looses their property?

physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

  1. On hammering

  2. On beating

  3. On dropping it from certain height

  4. When used in electric circuits

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Correct Option: A,B,C
Explanation:

The magnet can loose it property heating, by hammering and by using demagnetizing field we can demagnetize a magnet,On dropping it from certain height.

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Which all things can be used to make a magnet?

physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

  1. Iron nail

  2. Needle

  3. Blade

  4. Wood

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Correct Option: A,B,C
Explanation:

Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone.

A magnet can be easily turned into a ______ by excessive heating. Fill in the blank.

physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

  1. Electromagnet

  2. Permanent Magnet

  3. Temporary Magnet

  4. All of the above

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Correct Option: B
Explanation:

A magnet can be easily turned into a permanent magnet by excessive heating.

Rock of material which attract is termed as

physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

  1. magnet

  2. magnetite

  3. magnesia

  4. magnetic

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Correct Option: B

Which of the following process are used to make a magnet?

physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

  1. Casting of magnetic material

  2. Pressing and sintering of magnetic material

  3. Extruding of magnetic material

  4. All of the above

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Correct Option: D
Explanation:

Casting of a magnetic material, pressing and sintering of magnetic material and extruding of magnetic material are the processes used for making permanent magnets.

Which of the following cannot be used to make a magnet?

physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

  1. Cobalt

  2. Iron

  3. Ebonite

  4. Steel

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Correct Option: C
Explanation:

Iron, cobalt and steel are ferromagnetic materials which can be used to make magnet but ebonite cannot be used to make magnets.

______ is the only natural magnet. Fill in the blank.

physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

  1. Magnetite

  2. Ebonite

  3. Cobalt

  4. Nickel

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Correct Option: A
Explanation:

Among the following options, magnetite is the only natural magnet.