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MCQ Questions for CBSE Class 12 with Answers
MCQ Questions for CBSE Class 11 with Answers
MCQ Questions for CBSE Class 10 with Answers
MCQ Questions for CBSE Class 9 with Answers
MCQ Questions for CBSE Class 8 with Answers
MCQ Questions for CBSE Class 7 with Answers
MCQ Questions for CBSE Class 6 with Answers
MCQ Questions for CBSE Class 5 with Answers
MCQ Questions for CBSE Class 4 with Answers
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Ohms Law Class 9 MCQ Questions With Answers
1.
Which two areas of physical science are closely related to the development of electric motors and generators?
sound and light
electricity and sound
light and magnetism
electricity and magnetism
2.
What unit is used to measure the voltage?
Ohms
Omega
Volts
Amps
3.
An IPod uses a standard 1.5 V battery. How much resistance is in the circuit if it uses a current of 0.01A?
50Ω
100Ω
150Ω
200Ω
4.
An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.
60Ω
120Ω
180Ω
240Ω
5.
As the resistance in a circuit increases, the electric current __________.
increases
decreases
stays the same
6.
The strongest part of a magnet is...
the bars.
the force field.
the poles.
the middle.
7.
Speakers need a household voltage of 110 V to push a current of 5.5 A through them. What is theresistance of the speakers?
10Ω
20Ω
30Ω
40Ω
8.
A 12 Volt car battery pushes charge through the headlight circuit resistance of 10 ohms. How much currentis passing through the circuit?
1A
1.2A
1.4A
1.6A
9.
This contains a piece of metal that melts if it gets too hot in order to open a circuit.
conductor
insulator
fuse
circuit breaker
10.
Laser printers work with the use of heat and positive and negative charges. The laser etches a negative charge on spots of the printer drum in the form of text or images. The plastic ink dust is attracted to the places on the drum with this negative charge. What is the charge of the plastic ink dots themselves?
electron
negative
neutral
positive
11.
What unit is used to measure resistance?
Ohms
Omega
Volts
Amps
12.
Alexandra was preparing to go on a hike in the woods. She gathered the equipment she would need and placed it on the kitchen counter. By chance, she placed her compass near an electrical outlet. Although the compass was not moving, the compass needle turned because ______.
the electric current in the outlet produced a magnetic field
the compass could only be used outdoors
the kitchen counter was made of a magnetic substance
the kitchen had a microwave oven
13.
Which of the following will decrease the strength of the magnetic field around a wire?
increasing the current flowing through the wire
using less loops around the iron core
flipping the direction of the current flowing through the wire
using a larger iron core
14.
A circuit contains a 1.5 volt battery and a bulb with a resistance of 3 ohms. Calculate the current.
0.5A
1A
1.5A
2A
15.
How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms ofresistance?
10V
50V
100V
150V
16.
Electric charges always flow from _____ areas to _____ areas.
positive; negative
negative; positive
neutral; negative
neutral; positive
17.
Silver has a resistance of 0.0198 ohms. What voltage would produce a current of 100 amps?
1.98 V
0.000198 V
5050 V
100.0198 V
18.
What is resistance measured in?
Ω (Ohms)
V (Volts)
A (Amps)
W (Watts)
19.
Magnets have a north and a south ___________
shape
color
pole
region
20.
This exerts a force that causes other electric charges to move.
electrical poles
electrical fields
insulators
conductors
21.
In a closed circuit containing one resistor and a battery, if the voltage in the battery increases, the current going through the resistor increases. Why does this occur?
As the electrons are sped up, they bunch closer together.
As the electrons have more energy, they vibrate more rapidly.
As the electrons are pushed more by the battery, they move faster through the circuit.
As the distance around the circuit increases, the electrons take longer to travel around.
22.
The force or push that causes electric charges to move is called ______ .
resistance
voltage difference
static electricity
current
23.
Which circuit below contains the greatest voltage?
A circuit with a current of 20 amps and a resistance of 16 ohms
A circuit with a current of 10 amps and a resistance of 10 ohms
A circuit with a current of 25 amps and a resistance of 16 ohms
A circuit with a current of 20 amps and a resistance of 10 ohms
24.
What is the current produced by a 9-volt battery flowing through a resistance of 0.2 ohms?
1.8 amps
45 amps
0.022 amps
8.8 amps
25.
Calculate the current an electric clothes dryer draws when it is connected to a 230 V source and has a resistanceof 9.2 Ω.
5A
15A
25A
35A
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