MCQ questions for class 7 Science Chapter 14 Electric Current and Its Effects
Question 1: What is the flow of electric charge called?
Voltage
Current
Resistance
Power
Question 2: Which of the following materials is a good conductor of electricity?
Rubber
Plastic
Copper
Wood
Question 3: What is the term for a material that does not allow electric current to pass through it easily?
Conductor
Insulator
Semiconductor
Superconductor
Question 4: What is the unit of electric current?
Volt
Ampere
Ohm
Watt
Question 5: Which of the following is a safety device that breaks an electric circuit in case of an overload?
Fuse
Switch
Resistor
Circuit breaker
Question 6: What is the term for the continuous flow of electric charge in a circuit?
Voltage
Current
Resistance
Power
Question 7: Which of the following is the correct equation for calculating electrical power?
Power = Voltage × Current
Power = Current / Voltage
Power = Voltage / Current
Power = Current × Voltage
Question 8: What is the term for the opposition offered by a substance to the flow of electric current?
Voltage
Current
Resistance
Power
Question 9: Which of the following factors affects the resistance of a conductor?
Length
Temperature
Material
All of the above
Question 10: What is the term for the potential difference between two points in an electric circuit?
Voltage
Current
Resistance
Power
Question 11: Which of the following materials is commonly used as an insulator in electrical wires?
Copper
Aluminum
Rubber
Silver
Question 12: What is the term for the rate of doing work or the rate of flow of electric energy?
Voltage
Current
Resistance
Power
Question 13: Which of the following devices is used to control the current in an electric circuit?
Fuse
Switch
Resistor
Variable resistor
Question 14: What is the term for the flow of electric current in a closed conducting loop?
Open circuit
Closed circuit
Short circuit
Series circuit
Question 15: Which of the following statements is true about a parallel circuit?
The current remains the same in all components
The voltage is the same across all components
The resistance is the same in all components
The current may vary in different branches
Question 16: What is the term for a circuit in which components are connected one after the other?
Open circuit
Closed circuit
Short circuit
Series circuit
Question 17: Which of the following is an effect of electric current?
Heating effect
Cooling effect
Expansion effect
Compression effect
Question 18: What is the term for the phenomenon in which a wire becomes hot when an electric current passes through it?
Heating effect
Magnetic effect
Chemical effect
Lighting effect
Question 19: Which of the following substances is used as a fuse wire?
Copper
Aluminum
Lead
Tungsten
Question 20: What is the term for the bending of a compass needle when an electric current flows through a nearby wire?
Heating effect
Magnetic effect
Chemical effect
Lighting effect
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