Class 10 Magnetic Effects Of Electric Current CBSE Questions & Answers

Class 10 · Magnetic Effects Of Electric Current

Class 10 Magnetic Effects of Electric Current CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
What is the relation for magnetic field at the centre of a circular coil of radius r ?
  • A
    \({{\mu oI} \over r}\)
  • B
    \({{2\mu oI} \over r}\)
  • C
    \({{\mu oI} \over {2r}}\)
    Correct
  • D
    \({{\mu oI} \over 4}\)
2
What are the constituents of Alnico?
  • A
    Zinc, Pb, Al, Ni
  • B
    Mg, Mn, Al, Zn
  • C
    Al, Ni, Co, Na
  • D
    Al, Ni, Co, Fe.
    Correct
3
Who first detected the presence of magnetic field in earth?
  • A
    Maxi ell
  • B
    None of these
  • C
    Gilbert yes
    Correct
  • D
    Michael faraday
4
An electric fuse can prevent accidents arising from-
  • A
    An overload as well as well as short circuit.
    Correct
  • B
    An overload but not due to short circuit.
  • C
    A short circuit but not due to overload
  • D
    Neither an overload nor a short circuit.
5
Which of the following describes the common domestic power supplied in India
  • A
    220 v, 50 Hz
    Correct
  • B
    220 v, 100 Hz
  • C
    110 v, 50 Hz
  • D
    110 v, 100 Hz
6
Give names of two materials with which permanent magnets are made
  • A
    Carbon steel, chromium steal
  • B
    All of these
    Correct
  • C
    Alnico, Nipermag
  • D
    Tungsten steel
7
When a coil carries current in an anti clockwise direction what pole does it create?
  • A
    South pole
  • B
    None of these
  • C
    both South pole and North pole
  • D
    North pole
    Correct
8
Why does short circuit lead to the fuse wire burning?
  • A
    When live wire comes in contact with the neutral line
  • B
    None of these
  • C
    Both of these
    Correct
  • D
    When current in the circuit abruptly increases
9
A compass needle is kept far below, and parallel to a long straight current carrying wire. What is likely to happen to the compass needle?
  • A
    All of these
  • B
    Compares needle will deflect towards left
  • C
    Compass needle is likely to remain unaffected
    Correct
  • D
    Compass needle will defect towards right
10
Statement A : A commutator is sometimes called split rings. , Statement B : The induced current produced in conductor is direct in nature
  • A
    Both the statement A and B are true
  • B
    Statement A is true, B is false
    Correct
  • C
    Neither statement A not Statement B is true
  • D
    Statement B is true A is false
11
An electric generator is a device which converts
  • A
    electric energy into mechanical energy
  • B
    Mechanical energy into electric energy
    Correct
  • C
    electric energy into potential energy
  • D
    Kinetic energy into potential energy
12
Which rule determines the direction of flow of current in the conductor?
  • A
    All of these
    Correct
  • B
    Fleming’s left hand rule
  • C
    Fleming’s right hand rule
  • D
    right hand thumb rule
13
Statement A : The magnetic field produces by a current in a straight wire has no poles , Statement B : Like poles of magnets repel each other
  • A
    Neither statement A nor statement B is true
  • B
    Statement A is true, Bis false
  • C
    Statement B is true, A is false
    Correct
  • D
    Both the statement A and B are true
14
In the statement of Fleming’s left hand rule. What does the fore finger represent?
  • A
    magnetic field
    Correct
  • B
    electric field
  • C
    Current
  • D
    force
15
A closed loop with a battery and a key is kept close to a loop with a galvanometer. What is the change noticed in the coil?
  • A
    The deflection due to ON and OFF will be opposite
  • B
    All of these
    Correct
  • C
    Development of induced current
  • D
    Deflection in the galvanometer