Class 10 Electricity CBSE Questions & Answers

Class 10 · Electricity

Class 10 Electricity CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Which of the following is good conductor of electricity?
  • A
    Metals, Rubber
  • B
    Metals, mica
  • C
    Metals, quartz
    Correct
  • D
    Mica, quartz
2
The number of electrons present in one coulomb of charge is
  • A
    \({\rm{6}} \times {\rm{1}}{0^{{\rm{2}}0}}\)
  • B
    \({\rm{6}} \times {\rm{1}}{0^{ - - {\rm{19}}}}\)
  • C
    \({\rm{6}} \times {\rm{1}}{0^{{\rm{18}}}}\)
    Correct
  • D
    \({\rm{6}} \times {\rm{1}}{0^{{\rm{19}}}}\)
3
When a steady current flows through a conductor, the electrons in it move with certain average speed as
  • A
    drift speed
    Correct
  • B
    average velocity
  • C
    Accelerated speed
  • D
    root mean square speed
4
The function of rheostat in an electrical circuit is to
  • A
    None of these
  • B
    decrease the resistance in the circuit
  • C
    change the resistance in the circuit
    Correct
  • D
    Imprecise the resistance in the circuit
5
What is the resistivity of Nichrome
  • A
    \({\rm{1}}.{\rm{6}}0 \times {\rm{1}}{0^{ - {\rm{8}}}}\)
  • B
    \({\rm{11}}0 \times {\rm{1}}{0^{ - {\rm{8}}}}\)
    Correct
  • C
    \({\rm{12}}.{\rm{9}} \times {\rm{1}}{0^{ - {\rm{8}}}}\)
  • D
    \({\rm{1}}{0^{{\rm{1}}0}} - {\rm{1}}{0^{{\rm{14}}}}\)
6
Which of the following is incorrect about the heat produced in a resistor?
  • A
    It is directly proportional to the square of the current
  • B
    None of these
    Correct
  • C
    directly proportional to the time for which the current flows through the resistors
  • D
    directly proportional to resistance for a given current
7
‘Electrons are consumed in an electric circuit’ , the above statement is
  • A
    Partially true
  • B
    Partially false
  • C
    True
  • D
    False
    Correct
8
Which of the following fuse should be used for an electric iron of 1kw when operated at 220v?
  • A
    7A
  • B
    5A
    Correct
  • C
    3A
  • D
    1A
9
The melting point of Tungsten is
  • A
    \({\rm{333}}{{\rm{3}}^0}{\rm{c}}\)
  • B
    \({\rm{35}}{00^0}{\rm{c}}\)
  • C
    \({\rm{4}}{000^0}{\rm{c}}\)
  • D
    \({\rm{338}}{0^0}{\rm{c}}\)
    Correct
10
In an electric circuit the direction of electric current is
  • A
    from positive to negative
    Correct
  • B
    from negative to negative
  • C
    from positive to positive
  • D
    from negative to positive terminal
11
calculate the resistance of a conductor if the current flowing through it is 0.2A, when P. D. applied is 0.8v
  • A
    0.25\(\Omega \)
  • B
    4 \(\Omega\)
    Correct
  • C
    5 \(\Omega \)
  • D
    3 \(\Omega \)
12
Why is tungsten used exclusively for the filament of an incandescent lamp?
  • A
    The melting point of tungsten is very high
  • B
    All of these
    Correct
  • C
    Tungsten can be drawn into thin wires which in turn offer high resistance
  • D
    Tungsten has a fairly good resistivity
13
0.5 coulombs of charge flows through a conductor in 0.5 seconds. What is the magnitude of the current flowing through the conductor?
  • A
    1A
    Correct
  • B
    0.5 A
  • C
    0.2 A
  • D
    0.25A
14
How is ammeter connected in an electric circuit?
  • A
    In parallel
  • B
    None of these
  • C
    In series
    Correct
  • D
    sometimes in series and sometimes in parallel
15
Find the Incorrect statement
  • A
    The S. I unit of electric charge is coulomb
  • B
    The P. D. for all the resistors in the parallel circuit remains constant
  • C
    The direction of flow of negative charge was taken to the direction of electric current
    Correct
  • D
    None of these