Electricity and Circuits - SS1 Physics Past Questions and Answers - page 1
Which of the following statements is true about electric charges?
It is a scalar quantity.
Like charges attract each other.
It can not be created or destroyed.
Neutrons carry a positive charge.
What is the SI unit of electric charge?
Joule
Volt
Ampere
Coulomb
What is the direction of conventional current flow?
From positive to negative
From negative to positive
It depends on the circuit
It is not relevant for current flow
Which of the following materials is a good conductor of electricity?
Rubber
Glass
Copper
Plastic
What is the relationship between electric current and resistance?
Directly proportional
Inversely proportional
No relationship
Cannot be determined
Explain the concept of electric charge and its properties.
Electric charge is a fundamental property of matter. It can be positive or negative, and like charges repel each other while opposite charges attract. A charge is quantized, meaning it exists in discrete units called elementary charges. The SI unit of charge is the Coulomb (C).
Discuss the difference between conductors and insulators.
Conductors are materials that allow the flow of electric charge easily. They have loosely bound electrons that are free to move within the material. Examples include metals like copper and aluminium. Insulators, on the other hand, do not allow the flow of charge easily. They have tightly bound electrons and do not conduct electricity well. Examples include rubber, glass, and plastic.
According to Ohm's Law, the current flowing through a conductor is directly proportional to:
Voltage
Resistance
Power
Capacitance
What is the mathematical expression of Ohm's Law?
V = I x R
I = V + R
R = I/V
P = IV
The resistance of a conductor depends on which of the following factors?
Length of the conductor
Cross-sectional area of the conductor
Material of the conductor
All of the above