Magnetic Induction

Q.

Differentiate the properties between soft iron and steel.

Q.

What is Irons Permeability?

Q.

The ratio of the intensity of magnetization and magnetizing field is called __________.

Q.

How can you increase the strength of a Permanent magnet ?

Q. A permanent magnet can be demagnetized by.

1. heating
2. washing
3. freezing
4. rubbing with metals

Q. Which of the following is NOT a magnetic material?

1. Cobalt
2. Iron
3. Aluminium
4. Nickel

Q. Compass needle is placed in an aluminum or plastic case. Why do we not place it in an iron case?

1. Iron has magnetic nature
2. Iron gets easily corroded.
3. Iron is the conductor of electricity
4. Iron is expensive

Q. A permanent magnet is being rubbed over an iron bar from W to Z. Poles generated at end W and Z respectively are

1. North, North
2. North, South
3. South, North
4. South, South

Q.

what is Quinckes tube?

Q.

Which of the following is not a property of magnets?

1. Like pole repel each other

2. Opposite poles attract each other

3. It attracts magnetic material towards it.

4. None of these

Q. Which among the following materials gets attracted by a magnet?

1. Paper boat
2. Plastic comb
3. Wooden bat
4. Iron nail

Q.

Where are the poles of disc magnet located

Q.

What material has the highest permeability?

Q.

You are given an iron strip. How will you convert it into a magnet?

1. By putting into hot water

2. By placing a magnet near it for few hours

3. By rubbing it with a magnet for few minutes

4. It can't be converted

Q.

Which of the following statement is correct regarding magnets?

1. Rubber is a magnetic material.

2. Maximum iron filings stick to the middle of a bar magnet when it is brought near to them.

3. Bar magnets always point towards North-South direction.

4. Steel is not a magnetic material.

Q. If you are provided with an iron strip. How will you make it into a magnet?

1. By placing a magnet for few hours
2. By putting into the hot water
3. By rubbing it with a magnet for few minutes
4. It can’t be made

Q.

Ram brought a magnet near 3 pins made up of different materials. Pins Y and Z get attracted whereas pin X remains at its place as shown below.

Then X, Y, Z are _________, ________, __________ respectively.

1. Pix X - Steel
   Pin Y - Nickel
   Pin Z - Aluminium

2. Pix X - Iron
   Pin Y - Copper
   Pin Z - Brass

3. Pix X - Copper
   Pin Y - Brass
   Pin Z - Cobalt

4. Pix X - Copper
   Pin Y - Iron
   Pin Z - Steel

Q.

What causes magnetic susceptibility?

Q.

If a magnet is placed on a plastic plate with pins spread on it, then ________.

1. None of these

2. Pins stick all around the magnet

3. Pins stick at the middle of the magnet

4. Pins stick at the ends of the magnet

Q.

The attractive property of a magnet is maximum at

1. north and south poles both

2. mid point of magnet.

3. north pole only

4. south pole only

Q.

In an electric bell, striker is attracted by a/an__________.

1. bar magnet

2. cylindrical magnet

3. electromagnet

4. horseshoe magnet

Q. Which of the following is NOT a property of the magnet?

1. None of these.
2. Opposite poles attract each other.
3. Like poles repel each other.
4. It attracts magnetic material towards it.

Q.

Which of the following activities will result in the loss of magnetic properties?

1. By immersing a magnet in water at room temperature.

2. Heating

3. Hammering

4. Keeping a magnet idle for a long time

Q. Satish magnetised a piece of iron marked W, X, Y and Z using the rubbing method as shown in the figure.

Which of these parts of the iron piece will become the north pole?

1. W
2. X
3. Y
4. Z

Q. How can you convert an iron bar into a magnet?

1. By hammering it.
2. By rubbing a magnet on it for a few minutes.
3. By freezing it.
4. By keeping it in a hot glass of water.

Q.

You are given an iron strip. How will you convert it into a temporary magnet?

1. By placing a magnet near it for few hours.

2. By putting it into hot water.

3. By rubbing it with a magnet for few minutes.

4. It can't be converted.

Q. Identify the dependent or subordinate clause in the sentence.
Anil called at 5.30 and I told him that you had gone out. [Advance]

1. Anil called at 5.30
2. gone out
3. that you had gone out.
4. and I told him