Electricity Class 10 Quiz

What is the difference between resistance and resistivity?

• Resistance is measured in ohms, while resistivity is measured in ohm-meters.

• Resistance depends on the length and area of cross-section of a material, while resistivity is independent of these factors.

• Resistance is a scalar quantity, while resistivity is a vector quantity.

• Resistance is the opposition to the flow of electric current, while resistivity is the intrinsic property of a material to resist the flow of electric current.

Why is an ammeter connected in series and voltmeter connected in parallel?

• To measure the current passing through a component, an ammeter must be connected in series to become a part of the circuit, while a voltmeter must be connected in parallel to measure the potential difference across the component.

• To measure the power dissipated by a component, an ammeter must be connected in series, while a voltmeter must be connected in parallel.

• To measure the voltage across a component, an ammeter must be connected in series to become a part of the circuit, while a voltmeter must be connected in parallel to measure the current passing through the component.

• To measure the resistance of a component, an ammeter must be connected in series, while a voltmeter must be connected in parallel.

What is the difference between Open and Closed circuits?

• An open circuit has a high current, while a closed circuit has a low current.

• An open circuit does not allow the flow of electric current, while a closed circuit allows the flow of electric current.

• An open circuit has high resistance, while a closed circuit has low resistance.

• An open circuit has a high potential difference, while a closed circuit has a low potential difference.

Why does Ammeter have low resistance? Given reason

• Ammeters have low resistance to reduce the accuracy of current readings.

• Ammeters have low resistance to prevent overheating and damage to the circuit being measured.

• Ammeters have low resistance to increase the effect on the circuit being measured and provide higher current readings.

• Ammeters have low resistance to minimize the effect on the circuit being measured and ensure accurate current readings.

Why does Voltmeter have high resistance?

• Voltmeters have high resistance to increase the effect on the circuit being measured and provide higher voltage readings.

• Voltmeters have high resistance to minimize the effect on the circuit being measured and ensure accurate voltage readings.

• Voltmeters have high resistance to reduce the accuracy of voltage readings.

• Voltmeters have high resistance to prevent overheating and damage to the circuit being measured.

Least Count of Ammeter and Voltmeter

• The least count of an ammeter is the smallest resistance that can be measured by the instrument, while the least count of a voltmeter is the smallest current that can be measured by the instrument.

• The least count of an ammeter is the smallest current that can be measured by the instrument, while the least count of a voltmeter is the smallest voltage that can be measured by the instrument.

• The least count of an ammeter is the smallest voltage that can be measured by the instrument, while the least count of a voltmeter is the smallest current that can be measured by the instrument.

• The least count of an ammeter is the smallest current that can be measured by the instrument, while the least count of a voltmeter is the smallest resistance that can be measured by the instrument.

Electrical resistivity of a given metallic wire depends upon

• The current passing through the wire.

• The material of the wire and the temperature of the wire.

• The length and area of cross-section of the wire.

• The shape and size of the wire.

A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly

• 10^20

• 10^16

• 10^18

• 10^23

What is the maximum resistance which can be made using five resistors each of 1/5 Ω?

• 1/5 Ω

• 10 Ω

• 1 Ω

• 5 Ω

What is the minimum resistance which can be made using five resistors each of 1/5 Ω?

• 25 Ω

• 1/10 Ω

• 1/25 Ω

• 1/5 Ω