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Science True False[1 Marks ]

Electric Current and its Effects · Jharkhand Board (JAC) STD 7 (Jharkhand - English Medium). 17 questions.

Questions

True False[1 Marks ]

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17 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
An electric bell has an electromagnet. $(T/F)$
  • True
  • False
Answer
TrueAn electric bell has a piece of iron wound by a coil. When current passes through this coil, it behaves as an electromagnet.
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Question 21 Mark
An electromagnet does not attract a piece of iron. $(T/F)$
  • Ture
  • False
Answer
FalseWorking of an electromagnet is based on the magnetic effect of electric current. An electromagnet behaves as a magnet when current passes through it. Hence, it will attract a piece of iron.
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Question 31 Mark
When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. $(T/F)$
  • True
  • False
Answer
TrueThe wire of the fuse is made of special material which has a low melting point. When large current passes through a fuse, it melts quickly and breaks the circuit.
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Question 41 Mark
To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. $(T/F)$
  • True
  • False
Answer
FalseTo make a battery of two cells, the negative terminal of one cell must be connected to the positive terminal of the other cell.
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Question 51 Mark
A fuse is used to save energy in the electric circuits. True/ False.
Answer
False.
An electric fuse is used to prevent an electrical circuit from overloading and hence short circuit.
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Question 61 Mark
When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. True/ False.
Answer
True.
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Question 91 Mark
Electric fuse is based on the magnetic effect of electric current. True/ False.
Answer
False.
Because electric fuse is based on the heating effects of electric current.
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Question 111 Mark
The element of an electric iron is made of tungsten. True/ False.
Answer
False.
As the element of an electric bulb is made of tungsten.
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Question 131 Mark
A circuit is said to be open circuit or complete when current flows through it. True/ False.
Answer
False.
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Question 151 Mark
$CFLs$ consume more electricity than an ordinary bulb. True/ False.
Answer
False.
Since $CFLs$ consume less electricity than electric bulb.
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Question 171 Mark
Electric room heaters have coils of wire that produce heat, which are known as heating elements. True/ False.
Answer
True.
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