10th class physics unit 6 MCQs
chapter 6 MCQs 10th Class physics
Electromagnetism:
1. Which statement is true about the magnetic poles?
a. poles do not affect each other
b. Unlike poles repel
c. A single magnetic pole does not exist
d. Like poles attract
2. Study of magnetic effects of current is called:
a. Magnetism
b. Electricity
c. Electric capacity
d. Electromagne
3. A temporary magnet which is due to the flow of current in a coil:
a. Magnet
b. Magnetic field
c. Electromagnet
d. Electric intensity
4. MRI helps in the diagnoses of the disease:
a. Ear
b. Brain
c. Kidney
d. Eye
5. The study of magnetic effect of current is called:
a. Electrostatic induction
b. Current electricity
c. Electromagnetism
d. Static electricity
6. The lines of force of the magnetic field produced around the wire are in the form:
a. In the outward direction
b. Concentric circles
c. In the inward direction
d. Straight lines
7. The direction of magnetic field can be found using:
a. Magnetic poles
b. Left hand rule
c. Compass needle
d. Right hand rule
8. The magnetic field lines of a solenoid are:
a. From north pole to middle
b. From north to south pole
c. From south pole to middle
d. From south to north pole
9. The magnetic fields of a bar magnet and a coil are:
a. Equal
b. Same
c. Unequal
d. Different
10. What is the direction of the magnetic field lines inside a bar magnet?
a. From side to side
b. From north pole to south pole
c. There are no magnetic field lines
d. From south pole to north pole
11. The presence of a magnetic field can be detected by a
a. Stationary negative charge
b. Small mass
c. Magnetic compass
d. Stationary positive charge
12. If the current in a wire which is placed perpendicular to magnetic field increases, the force on the wire
a. Remains the same
b. Increases
c. Will be zero
d. Decreases
13. Michael Faraday belonged to:
a. Saudi Arabia
b. England
c. Russia
d. America
14. Electric current passing through a conductor produces a:
a. Current
b. Electric field
c. South and north poles
d. Magnetic field
15. The force on a wire acts ……… to the direction of the both magnetic field and the direction of the current:
a. Anti-parallel
b. Parallel
c. Horizontal
d. Perpendicular
16. The force acting on the wire can be increased by increasing:
a. Length of the wire inside magnetic field
b. Current in the wire
c. Strength of magnetic field
d. All
17. The direction of the magnetic force can be found using:
a. Magnetic poles
b. Right hand rule
c. Compass needle
d. Left hand rule
18. In order to increase the turning effect of the loop, we increase the:
a. Force on the loop
b. Length of the loop
c. Number of the loops
d. All
19. A D.C motor converts
a. Electrical energy into mechanical energy
b. Mechanical energy into electrical energy
c. Electrical energy into chemical energy
d. Mechanical energy into chemical energy
20. Which part of D.C motor reverses the direction of current through the coil every half-cycle?
a. The brushes
b. The armature
c. The split rings
d. The commutator
21. In DC motor, coil can rotate in magnetic field through an angle of:
a. 30°
b. 90°
c. 60°
d. 45°
22. The device which converts electric energy into mechanical energy is called:
a. Transformer
b. DC motor
c. Generator
d. All of the above
23. Which device was based on the principle of electromagnetism?
a. CD’s
b. TV
c. Mobile phones
d. Electric motor
24. The force acting on the armature can be increased by increasing:
a. Area of the coil
b. Number of turns of the coil
c. Current in the coil
d. All
25. The brushes used in DC motor are made of:
a. Lead
b. Iron
c. Silver
d. Graphite
26. Electromagnetic Induction and electrolysis represent:
a. Newton
b. Ohm
c. Michael faraday
d. George coulomb
27. Electromagnetic induction was introduced by:
a. Ampere
b. Faraday
c. Coulomb
d. Hans Christian Oersted
28. The factors affecting induced emf are:
a. Four
b. Two
c. Five
d. Three
29. If we increase the number of turns in the coil, induced emf ………:
a. Remains constant
b. Increases
c. No change
d. Decreases
30. The direction of induced e. m. f. in a circuit is in accordance with conservation of
a. Momentum
b. Mass
c. Energy
d. Charge
31. The device which converts mechanical energy into electrical energy is called:
a. AC generator
b. Transformer
c. Electroscope
d. DC motor
32. In hydroelectric power house, ……… works on the principle of Electromagnetic Induction:
a. Voltaic cell
b. Galvanic cell
c. Generator
d. Motor
33. AC generator works on the principle of:
a. Electronics
b. Electromagnetic
c. Electromagnetic induction
d. Electrostatic induction
34. The current in the AC generator is minimum when the plane of the loop is ……… to the magnetic field:
a. Anti-parallel
b. Perpendicular
c. Downward
d. Parallel
35. In AC generator the direction of current is reversed after each:
a. 270o
b. 90o
c. 360o
d. 180o
36. The example of mutual induction is:
a. Transformer
b. AC generator
c. Relay
d. DC motor
37. The step-up transformer:
a. Has more turns in the primary coil
b. Increases the input current
c. Has less turns in the secondary coil
d. Increases the input voltage
38. The turn ratios of a transformer is 10. It means
a. Ns = 10Np
b. Is = 10Ip
c. Vs = V p/10
d. Ns = Np/10
39. The device which is used to increase or decrease alternating voltage is called:
a. AC generator
b. Electric motor
c. Solenoid
d. Transformer
40. Transformer uses:
a. Power
b. Charge
c. Voltage
d. Energy
41. Transformer is used for:
a. Increasing voltage
b. None of the above
c. Both
d. Decreasing voltage
42. Step down transformer:
a. Has more turns in its secondary coil
b. Decreases input current
c. Has more turns in its primary coil
d. Decreases input voltage
43. Transformer works on the principle of:
a. Mutual induction
b. Selfinduction
c. Electrostatic induction
d. Electromagnetic induction
44. An application of transformer is:
a. Computer
b. Radio
c. Printer
d. Television
45. The number of coils in transformer are:
a. Three
b. One
c. Four
d. Tow
46. If the secondary voltage is larger than the primary voltage then the transformer is:
a. Ideal transformer
b. Step up transformer
c. Step down transformer
d. None
47. If the secondary voltage is smaller than the primary voltage then the transformer is:
a. Ideal transformer
b. Step up transformer
c. None
d. Step down transformer
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