Metal Detector

Q.

What is a sensor? State uses of sensors.

Q. Which of these are application of metal detector?

1. Inspection of people in entrace of malls, airports and stations.
2. Food processing industry uses for detection of metals in food.
3. Detection of precious metals.
4. Detection of clay artifacts buried underground.

Q.

In which of the following devices temporary magnets are used?

1. Dynamo

2. Electric motors

3. Generators

4. Electric cranes

Q. The function of metal detector is based on electromagnet.

1. True
2. False

Q. Which of the following materials can be detected by a metal detector?

1. Gold
2. Plastic
3. Steel
4. Paper

Q.

How can we make an electromagnet from donut magnets

Q.

A doorbell uses attractive property of ……….

Q. Which of the following are correct about metal detector?

1. It uses an electromagnet.
2. It uses a permanent magnet.
3. Magnetic field is detected by the metal detector.
4. It is capable of detecting few non - metallic objects too.

Q. Rohan made an electromagnet by winding 50 turns of wire over an iron screw. Ria also made an electromagnet by winding 100 turns of wire over another iron screw of the same kind. Which electromagnet will attract more pins? Explain.

Q.

State whether the following statement is true or false:

A current-carrying wire will show a magnetic effect only if it is made into a coil.

1. True
2. False

Q. Which among the following is a part of a metal detector ?

1. Permanent bar magnet
2. Electromagnet
3. Permanent ring magnet
4. Magnetic compass

Q.

Explain the term electromagnetism.

Q.

An electromagnet is a _________magnet.

Q. Where do we use electromagnets?Explain each usage.

Q. Which of the following statement are true for an electromagnet?

1. Electromagnets are created by passing electricity through a conductor.
2. Electromagnets are created by heating a conductor.
3. Electromagnets are permanent magnets.
4. Electromagnets are temporary magnets.

Q. State True or False.
An electromagnet does not attract a piece of iron. (True/False)

Q. Choose the device that works on the principle of magnetic effects of electric current.

1. Iron box
2. Loudspeakers
3. Lever
4. Wind turbine

Q.

A current carrying conductor behaves like a/an___________.

1. Electromagnet

2. Shock

3. Flow

4. Negative

Q. Which of following is used in a metal detector?

1. Electromagnet
2. Barometer
3. Odometer
4. Speedometer

Q. Electromagets are used in ______.

1. speakers
2. metal detectors
3. hard drives
4. food industry