Science Practice Quiz 210

Q1.What is another practical application of electromagnets mentioned in the text, besides lifting heavy loads?

A. To purify water in industrial settings. B. To generate light in emergency lamps. C. To separate magnetic material from the junk. D. To measure atmospheric pressure.

Q2.For what specific medical purpose do doctors use tiny electromagnets?

A. To perform intricate surgeries on the brain. B. To take out small pieces of magnetic material that have accidentally fallen in. C. To sterilize surgical instruments. D. To detect bone fractures.

Q3.What phenomenon is described as the 'magnetic effect of the electric current'?

A. The heating of a wire when current passes through it. B. The emission of light from a wire carrying current. C. The behavior of a wire like a magnet when electric current passes through it. D. The resistance offered by a wire to the flow of current.

Q4.Who was the first person to notice the deflection of a compass needle every time electric current was passed through a wire?

A. Michael Faraday B. Thomas Edison C. Hans Christian Oersted D. Alessandro Volta

Q5.What happens to a compass needle when electric current flows in a nearby wire?

A. It starts rotating rapidly. B. It gets deflected from its initial position. C. It points towards the east-west direction. D. It remains unaffected.

Q6.What precaution is advised when switching on the current for an electromagnet experiment?

A. The wire should be made of a non-magnetic material. B. The current should be switched on for a prolonged period to ensure strong magnetism. C. The current should not be switched on for more than a few seconds at a time. D. The iron nail should be replaced with a copper rod.

Q7.Which of the following components is an essential part of an electric bell?

A. Heating coil B. Electromagnet C. Permanent magnet D. Resistor

Q8.What action directly produces the sound in an electric bell?

A. The vibration of the electromagnet. B. The contact screw touching the iron strip. C. The hammer striking the gong. D. The heating effect of the current.

Q9.What is the immediate effect when the electromagnet pulls the iron strip in an electric bell?

A. The current increases in the coil. B. The circuit is broken. C. The gong vibrates continuously. D. The iron strip becomes a permanent magnet.

Q10.If the current through the coil of an electric bell stops flowing, what happens to the coil?

A. It remains an electromagnet but with reduced strength. B. It becomes a permanent magnet. C. It stops being an electromagnet. D. It starts attracting the gong.

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Science Practice Quiz 210