Class 7 Electric Current And Its Effects CBSE Questions & Answers

Class 7 · Electric Current And Its Effects

This is Science Class 7 Electric Current and its Effects CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Electricity is produced in power stations by
  • A
    Generators
    Correct
  • B
    Motor
  • C
    Cell
  • D
    Battery
2
Filament of electric bulb is made up of
  • A
    Copper
  • B
    Silver
  • C
    Tungsten
    Correct
  • D
    Nichrome
3
An electric cell produces electricity from the
  • A
    Charge stored in it.
  • B
    Kinetic energy stored in it.
  • C
    Chemical stored in it
    Correct
  • D
    Mechanical energy stored in it.
4
Inside the torch two or more cells are placed with
  • A
    Positive- positive- negative- negative.
  • B
    Negative- negative- positive – positive
  • C
    Positive – negative- positive –negative
    Correct
  • D
    Negative – positive- positive- negative
5
Amount of heat produced in a conductor does not depends upon its
  • A
    Resistance
  • B
    Pressure
    Correct
  • C
    Time
  • D
    Current
6
A ------is used in torches.
  • A
    Dry cell
    Correct
  • B
    Secondary cell
  • C
    Fuse
  • D
    Generator
7
Which of the following lightening device uses comparatively less energy?
  • A
    Bulb
  • B
    Tube light
  • C
    Filament rod
  • D
    Compact fluorescent lamp
    Correct
8
ISI mark is issued by
  • A
    Indian intelligence bureau
  • B
    Standard bureau of Indian
  • C
    Indian standard bureau
  • D
    Bureau Indian standard
    Correct
9
ISI marks ensure that appliance is safe and wastage of energy is
  • A
    Not at all
  • B
    Minimum
    Correct
  • C
    Negligible
  • D
    Maximum
10
Electrical fuse is made of material
  • A
    That breaks when high current flows
    Correct
  • B
    That breaks when low current flows
  • C
    That heat fast
  • D
    That produce light
11
Filament of electric bulb is made up of
  • A
    Tungsten
    Correct
  • B
    Silver
  • C
    Nichrome
  • D
    Copper
12
The maximum limit of current that can flows a circuit is called
  • A
    Current rating
    Correct
  • B
    Current pass
  • C
    Current ability
  • D
    Current resistance
13
In electric circuit, fire may occurs due to
  • A
    Only overloading
  • B
    Only short circuit
  • C
    Overloading and short-circuit
    Correct
  • D
    Excessive power
14
MCB is used in circuit because
  • A
    Both turn ON and turn OFF automatically
  • B
    It turn ON the circuit automatically
  • C
    Neither turn ON and turn OFF automatically
  • D
    It turns OFF the circuit automatically
    Correct
15
When a magnetic compass is placed near a current carrying conductor. Compass
  • A
    Deflects due to magnetic effect
    Correct
  • B
    Deflects due to heating effect
  • C
    Deflects due to chemical effect
  • D
    Do not deflect