Electric Effects of Current – CBSE Class 10
1. The flow of electric charge is called
A) Current
B) Voltage
C) Resistance
D) Power
Answer: Current
2. SI unit of electric current is
A) Ampere
B) Volt
C) Ohm
D) Watt
Answer: Ampere
3. Electric current flows due to
A) Potential difference
B) Magnetic field
C) Heat
D) Light
Answer: Potential difference
4. Material that allows current to pass through easily is called
A) Conductor
B) Insulator
C) Semiconductor
D) Superconductor
Answer: Conductor
5. Material that does not allow current to pass through is called
A) Conductor
B) Insulator
C) Semiconductor
D) None
Answer: Insulator
6. Ohm’s law states that
A) Current is directly proportional to voltage at constant temperature
B) Voltage is inversely proportional to current
C) Resistance is current × voltage
D) Power = Voltage × Current
Answer: Current is directly proportional to voltage at constant temperature
7. The SI unit of resistance is
A) Ohm
B) Ampere
C) Volt
D) Watt
Answer: Ohm
8. Resistance of a conductor depends on
A) Material, length, cross-sectional area, temperature
B) Only material
C) Only length
D) None
Answer: Material, length, cross-sectional area, temperature
9. When current passes through a conductor, it produces
A) Heating effect
B) Magnetic effect
C) Both heating and magnetic effect
D) None
Answer: Both heating and magnetic effect
10. Heating effect of current is used in
A) Electric iron
B) Electric heater
C) Fuse
D) All of these
Answer: All of these
11. Magnetic effect of current is used in
A) Electric bell
B) Electric motor
C) Electromagnet
D) All of these
Answer: All of these
12. Electric fuse protects electrical devices from
A) Excess current
B) Voltage drop
C) Resistance
D) None
Answer: Excess current
13. The filament of a bulb is made of
A) Tungsten
B) Copper
C) Aluminium
D) Iron
Answer: Tungsten
14. The filament in electric bulb is thin because
A) Thin filament has more resistance and produces heat
B) Thick filament does not conduct
C) Thick filament burns
D) None
Answer: Thin filament has more resistance and produces heat
15. Electric current produces chemical effect in
A) Electroplating
B) Electrolysis
C) Both A and B
D) Electric motor
Answer: Both A and B
16. Electroplating is used to
A) Protect metals from corrosion
B) Decorate objects
C) Both A and B
D) None
Answer: Both A and B
17. Unit of electric energy is
A) Joule
B) Watt
C) Volt
D) Ampere
Answer: Joule
18. Commercial unit of electric energy is
A) Kilowatt-hour (kWh)
B) Joule
C) Watt
D) Volt
Answer: Kilowatt-hour (kWh)
19. Fuse wire melts when
A) Current exceeds safe limit
B) Voltage increases
C) Resistance decreases
D) Power decreases
Answer: Current exceeds safe limit
20. An electric fuse is connected
A) In series
B) In parallel
C) Anywhere
D) None
Answer: In series
21. Heating effect of current is given by
A) H = I²Rt
B) H = VIt
C) H = V²t/R
D) All of these
Answer: All of these
22. Magnetic field around current-carrying conductor is
A) Circular
B) Linear
C) Elliptical
D) None
Answer: Circular
23. Right-hand rule is used to find
A) Direction of magnetic field
B) Direction of current
C) Direction of force
D) Voltage
Answer: Direction of magnetic field
24. Solenoid is used to create
A) Uniform magnetic field
B) Circular motion
C) Heating
D) Electric current
Answer: Uniform magnetic field
25. Electromagnet is made by
A) Coiling wire around iron core and passing current
B) Using permanent magnet
C) Using copper plate
D) Using battery only
Answer: Coiling wire around iron core and passing current
26. Electromagnets are used in
A) Electric bells
B) Lifting heavy metallic objects
C) Magnetic cranes
D) All of these
Answer: All of these
27. Fuse wire is made of
A) Tin-lead alloy
B) Copper
C) Aluminium
D) Iron
Answer: Tin-lead alloy
28. Filament of bulb is made of tungsten because
A) High melting point
B) Low resistance
C) Cheap
D) Flexible
Answer: High melting point
29. Electric current produces heating effect in
A) Bulb
B) Electric heater
C) Fuse
D) All of these
Answer: All of these
30. Joule’s law of heating is
A) Heat produced ∝ I²Rt
B) Heat ∝ V²/R
C) Heat ∝ VIt
D) All of these
Answer: All of these
31. Heating effect is utilized in
A) Electric iron
B) Electric heater
C) Electric fuse
D) All of these
Answer: All of these
32. Magnetic effect is utilized in
A) Electric bell
B) Electric motor
C) Electromagnet
D) All of these
Answer: All of these
33. Electroplating is done to
A) Protect metals
B) Decorate objects
C) Both A and B
D) None
Answer: Both A and B
34. Copper is often electroplated to
A) Prevent corrosion
B) Conduct electricity
C) Reduce resistance
D) None
Answer: Prevent corrosion
35. Silver is used in electroplating for
A) Decoration and conductivity
B) Magnetic properties
C) Heating
D) Insulation
Answer: Decoration and conductivity
36. Aluminum fuse wire is not preferred because
A) Low melting point
B) High melting point
C) Expensive
D) Conducts poorly
Answer: Low melting point
37. Fuse wire melts due to
A) Excess heat produced by current
B) Voltage drop
C) Magnetic field
D) Reflection
Answer: Excess heat produced by current
38. Heating effect of current is proportional to
A) Square of current
B) Resistance
C) Time
D) All of these
Answer: All of these
39. Electric bulb glows due to
A) Heating effect of current in filament
B) Reflection
C) Scattering
D) Magnetic effect
Answer: Heating effect of current in filament
40. Electric heater works on
A) Heating effect of current
B) Magnetic effect of current
C) Chemical effect
D) None
Answer: Heating effect of current
41. Electric iron works on
A) Heating effect of current
B) Magnetic effect of current
C) Chemical effect
D) Optical effect
Answer: Heating effect of current
42. Right-hand rule determines
A) Direction of magnetic field
B) Direction of current
C) Voltage
D) Resistance
Answer: Direction of magnetic field
43. Direction of force on a current-carrying conductor in magnetic field is given by
A) Fleming’s left-hand rule
B) Right-hand rule
C) Ohm’s law
D) Joule’s law
Answer: Fleming’s left-hand rule
44. Solenoid produces uniform magnetic field inside because
A) Coiling of wire
B) Current flows
C) Both A and B
D) None
Answer: Both A and B
45. Electric bell works due to
A) Magnetic effect of current
B) Heating effect
C) Chemical effect
D) Optical effect
Answer: Magnetic effect of current
46. Electric motor works on
A) Magnetic effect of current
B) Heating effect
C) Chemical effect
D) Optical effect
Answer: Magnetic effect of current
47. Electroplating prevents corrosion because
A) Metal surface is coated with another metal
B) Metal is heated
C) Metal is painted
D) Metal is magnetized
Answer: Metal surface is coated with another metal
48. Electric energy consumed is given by
A) E = Pt
B) E = I²Rt
C) E = VIt
D) All of these
Answer: All of these
49. Electrical safety device in homes is
A) Fuse
B) Switch
C) Bulb
D) Motor
Answer: Fuse
50. Electric current produces
A) Heating, chemical and magnetic effects
B) Only heating effect
C) Only magnetic effect
D) Only chemical effect
Answer: Heating, chemical and magnetic effects
Also Read:Refraction of Light – CBSE Class 10