Nature of Magnetic Force

Q.

What Is The Basic Principle Of Magnetism?

Q.

"The magnitude of non-contact forces depend upon distance between two bodies". The given statement is

1. False

2. True

Q.

Which alloy is used to make powerful magnets?

1. Bronze

2. Steel

3. Alnico

4. Ferrites

Q.

A magnet always has two poles.

1. True

2. False

Q.

Encircle the odd one out. Give reason for your choice

Iron, nickel, copper and cobalt

Q.

Gold and copper are nonmagnetic materials.

1. True
2. False

Q.

A bar magnet is divided into three equal parts . What should be the polarity at the ends of middle part?

Q.

How can you tell whether a particular material is magnetic or nonmagnetic?

Q.

The substances which cannot be magnetised are called ________ substances.

Q.

difference between wrought iron and steel

Q.

Harish was asked to identify a piece of soft iron put in a basket of 10 magnets of the same shape and size. Which is the easiest way of identifying the iron piece at the earliest?

1. By suspending the magnets one at a time

2. By conducting repulsion test using any two magnets at a time

3. By bringing another strong magnet near the basket

4. By dropping all magnets into the water

Q.

When can you say an object is a magnet?

1. 1 and 2

2. 1, 2 and 4

3. 2 and 4

4. 2 only

Q. What are natural and artificial magnets?​ [$\text{4 Marks}$]

Q.

Which of the following is not a property of a typical magnet?

1. None of these

2. Exert an attractive or repulsive force on other magnets

3. Have an effect on electrical conductors when the magnet and conductor are moving in relation to each other

4. Attract certain materials - such as iron, nickel, cobalt, certain steels and other alloys

Q. The force exerted by a magnet on an iron bar is an example of:

1. Electrostatic force
2. Non-contact force
3. Contact force
4. Gravitational force

Q.

What does a magnet has has which makes iron things attract towards it? What happens in its suurroundings that makes ironthings attract towards it? Is it physical or what?

Q. The force exerted by a magnet on an iron bar is an example of:

1. Non-contact force
2. Electrostatic force
3. Contact force
4. Gravitational force

Q.

Magnetic induction precedes attraction. Explain

Q. what are the examples of conservative force??

Q. The force exerted by a magnet on an iron bar is an example of:

1. Gravitational force
2. Contact force
3. Electrostatic force
4. Non-contact force

Q.

1. Metal

2. Book

3. Plastic

4. Wood

Q.

Materials which get attracted towards magnet are known as _________.

1. non magnetic material

2. magnetic material

3. dielectric materials

4. insulating materials

Q. Match the following according to their properties.

1. Maximum strength
2. Magnetic needle
3. Natural magnet

Q. The strength of a bar magnet is at its poles.

1. minimum
2. maximum
3. zero

Q. The force exerted by a magnet on an iron bar is an example of:

1. Gravitational force
2. Electrostatic force
3. Contact force
4. Non-contact force

Q.

The gravitational force between two bodies is

1. never attractive

2. attractive or repulsive

3. always repulsive

4. always attractive