WorksheetsRecap EMC 1-2
Total questions: 28
Worksheet time: 9mins
Name
Class
Date
1.
What are the two poles of a magnet called?
a)
Positive and Negative
b)
North and South
c)
Up and Down
d)
Left and Right
2.
Why does an iron nail become a temporary magnet when placed near a strong magnet?
a)
It gains extra electrons
b)
Its domains align with the magnetic field
c)
It gets electrically charged
d)
It melts slightly
3.
What are the two poles of a magnet called?
a)
a) Positive and Negative
b)
b) North and South
c)
c) Up and Down
d)
d) Left and Right
4.
Which of these is a natural magnet?
a)
a) Refrigerator magnet
b)
b) Earth
c)
c) Steel paperclip
d)
d) Electromagnet
5.
What happens when two like poles of magnets face each other?
a)
a) They attract
b)
b) They repel
c)
c) They stick together
d)
d) Nothing happens
6.
What is the unit of magnetic flux?
a)
a) Tesla
b)
b) Ohm
c)
c) Weber
d)
d) Ampere
7.
Which rule helps determine the direction of the magnetic field around a current-carrying wire?
a)
a) Left Hand Rule
b)
b) Right Hand Grip Rule
c)
c) Fleming’s Right Hand Rule
d)
d) Ohm’s Law
8.
Why does an iron nail become a temporary magnet when placed near a strong magnet?
a)
a) It gains extra electrons
b)
b) Its domains align with the magnetic field
c)
c) It gets electrically charged
d)
d) It melts slightly
9.
If current in a wire flows toward you, what is the direction of its magnetic field?
a)
a) Clockwise
b)
b) Counter-clockwise
c)
c) Straight up
d)
d) Random
10.
What happens to the force between two parallel wires if their currents flow in opposite directions?
a)
a) They attract
b)
b) They repel
c)
c) No force acts
d)
d) They explode
11.
How can you increase the strength of an electromagnet?
a)
a) Use thinner wire
b)
b) Add more turns to the coil
c)
c) Decrease current
d)
d) Remove the iron core
12.
What does Fleming’s Left Hand Rule predict?
a)
a) Direction of induced current
b)
b) Direction of force on a current-carrying wire
c)
c) Strength of a magnetic field
d)
d) Voltage in a circuit
13.
Why does a generator produce electricity when a coil spins in a magnetic field?
a)
a) Because of friction
b)
b) Due to electromagnetic induction ✅
c)
c) The wires heat up
d)
d) Magic
14.
What is the role of Lenz’s Law in electromagnetic induction?
a)
a) It increases the induced current
b)
b) It opposes the change causing the current ✅
c)
c) It reverses the magnetic field
d)
d) It stops all current flow
15.
Which device converts electrical energy into mechanical energy?
a)
a) Generator
b)
b) Motor ✅
c)
c) Transformer
d)
d) Resistor
16.
What happens if you move a magnet faster through a coil?
a)
a) Induced voltage decreases
b)
b) Induced voltage increases ✅
c)
c) Nothing changes
d)
d) The magnet gets hotter
17.
Why do maglev trains float above the track?
a)
a) Due to air pressure
b)
b) Magnetic repulsion ✅
c)
c) Frictionless wheels
d)
d) Invisible strings
18.
A wire carries current into the page (⨂). What is the direction of its magnetic field at a point above the wire?
a)
a) Clockwise ✅
b)
b) Counter-clockwise
c)
c) Upward
d)
d) Downward
19.
A solenoid with an iron core produces a stronger magnetic field because:
a)
a) Iron increases resistance
b)
b) Iron aligns its domains, boosting flux ✅
c)
c) Iron cools the coil
d)
d) Iron reflects magnetism
20.
If a conductor moves parallel to a magnetic field, what is the induced voltage?
a)
a) Maximum
b)
b) Zero ✅
c)
c) Half the maximum
d)
d) Unpredictable
21.
In a motor, if the current and magnetic field reverse simultaneously, the force direction will:
a)
a) Reverse
b)
b) Stay the same ✅
c)
c) Disappear
d)
d) Become chaotic
22.
A generator’s output voltage can be doubled by:
a)
a) Halving the rotation speed
b)
b) Doubling the number of coil turns ✅
c)
c) Using a weaker magnet
d)
d) Reducing wire thickness
23.
Why do maglev trains float above the track?
a)
a) Due to air pressure
b)
b) Magnetic repulsion ✅
c)
c) Frictionless wheels
d)
d) Invisible strings
24.
A wire carries current into the page (⨂). What is the direction of its magnetic field at a point above the wire?
a)
a) Clockwise ✅
b)
b) Counter-clockwise
c)
c) Upward
d)
d) Downward
25.
A solenoid with an iron core produces a stronger magnetic field because:
a)
a) Iron increases resistance
b)
b) Iron aligns its domains, boosting flux ✅
c)
c) Iron cools the coil
d)
d) Iron reflects magnetism
26.
If a conductor moves parallel to a magnetic field, what is the induced voltage?
a)
a) Maximum
b)
b) Zero ✅
c)
c) Half the maximum
d)
d) Unpredictable
27.
In a motor, if the current and magnetic field reverse simultaneously, the force direction will:
a)
a) Reverse
b)
b) Stay the same ✅
c)
c) Disappear
d)
d) Become chaotic
28.
A generator’s output voltage can be doubled by:
a)
a) Halving the rotation speed
b)
b) Doubling the number of coil turns ✅
c)
c) Using a weaker magnet
d)
d) Reducing wire thickness
100 %
