An electrical fan rotates when the equipment is switched on . What are the charge carries that convey the current in the fan?
Chapter 14 Electric Current

Quiz
•
Physics
•
12th Grade - University
•
Hard
shanii pok
Used 84+ times
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Electrons only
Negative ions only
Holes and electrons
Lattice atoms and fee electrons
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When a conductor carries a current, the number of conduction electrons that flow in the conductor for 10 s is 3.75 . What is the current that flows in the conductor?
3.8 A
4.2 A
6.0 A
10 A
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A neon lamp is connected to a battery. If a constant current of 1.25 A flows to the lamp, how long will it take for a charge of 15 C to flow through the lamp?
8.3 s
12 s
16 s
19 s
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A conductor of cross-sectional area 0.10 carries a current of 2.5 A. If the number of conduction electrons per cubic metre is . What is the value of drift velocity of the free electrons in the conductor?
1.6
3.9
3.0
6.2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which statement is true about the drift velocity of the electrons in a current-carrying metallic conductor?
It is directly proportional to the diameter of the conductor.
It is inversely proportional to the current.
It is inversely proportional to the number of conduction electrons per unit volume.
It is directly proportional to the resistance of the conductor if the potential difference across the conductor is kept constant.
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A conductor of length 2.0 m and cross-sectional area 5.0 carries a current of 6.0 A. If the drift velocity of the conduction electrons is 1.5 , what is the number of electrons in the conductor?
2.5
2.9
4.2
5.0
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A tungsten wire of length 1.00 m and cross-sectional area 2.01 carries a current of 5.00 A. If the number of free electrons per unit volume is 4.3 , what is the time taken by an electron to travel from one end of the wire to the other end?
1.81 s
2.77 s
4.51 s
7.25 s
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