Class 7 Science Online Tests
Uses of Electromagnets MCQ (Multiple Choice Questions) PDF Download
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Uses of Electromagnets MCQ (PDF) Questions Answers Download
A good permanent magnet should produce a high magnetic field with a
- high mass
- low mass
- dense mass
- thick mass
If someone carrying a knife or gun passes through a detector, it alters the rate of
- current
- voltage
- resistance
- magnetic field
Another example of 'electromagnets' in trains is
- bullet train
- passenger train
- maglev train
- cargo train
'Earphones' are
- magnets
- small loudspeakers
- soft speakers
- magnetized speakers
When small hammer is attracted by electromagnet, the bell
- sparks
- vibrates
- stops
- strucks
Class 7 Science Practice Tests
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