It was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made of plastic. Name a material that might have been used to make some part of it

3

(a)

Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.

Column I	Column II
N-N
N-	Attraction
S-N
-S	Repulsion

3

(a)

Write any two properties of a magnet.

3

(a)

Where are poles of a bar magnet located?

3

(a)

A bar magnet has no markings to indicate its poles. How would you find out near which end is its North pole located?

3

(a)

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

3

(a)

Four identical iron bars were dipped in a heap of iron filings one by one. Figure shows the amount of iron filings sticking to each of them.
(a) Which of the iron + bar is likely to be the strongest magnet?
(b) Which of the iron bar is not a magnet? Justify your answer.

3

(a)

Explain whether the magnetic poles exist separately like charges or not.

3

(a)

A toy car has a bar magnet laid hidden inside its body along its length. Using another magnet, how will you find out which pole of the magnet is facing the front of the car?

3

(a)

Boojho kept a magnet close to an ordinary iron bar. He observed that the iron bar attracts a pin as shown in figure.

What inference could he draw from this observation? Explain.

3

(a)

Suggest an arrangement to store a U-shaped magnet. How is this different from storing a pair of bar magnets?

3

(a)

Kanchan is a class VI student. She has to show an activity in school exhibition. But, she has no idea. Her friend Suresh advised her to do an activity in which rope stands without any support with the help of magnet and ask her to take a small rope, a magnet, a cup and a stand.
(a) State the values that Suresh reflect here?
(b) Name some non-magnetic materials.

3

(a)

Explain how will you test that the 'tea dust' is not adulterated with iron powder.

3

(a)

Priya went a place for her summer vacation with her sister Monami Mukherji. As the day was dark, so she didn't confirm that in which direction is east. Her sister had a magnetic compass and she told Priya to find the direction with the compass.
(a) State the values that Monami Mukherji reflect here.
(b) Mention what happen to a freely suspended magnet.

3

(a)

State the ways through which a magnet can be demagnetised.

3

(a)