Class 9th science, ,3.

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Current Electricity

Three resistors of resistances 10 ohm 20 ohm and 30 ohm are connected in series then the effective resistance of the circuit is.. *

2 points

30 ohm

50 ohm

5.45 ohm

60 ohm

If the resistance of a conductor in a project then the current.. *

2 points

Increases

Decreases

remains the same

becomes zero

The unit of resistivity..... *

2 points

Ohm

Ohm meter

Volt

Ohm/meter

Which of the following substance substances is not insulator? *

2 points

Wood

Plastic

Glass

Aluminium

If two resistors of 3ohm and 9ohm are connected in parallel in a circuit and if the current flowing through the main circuit is 1.2 A. The current flowing through each resistor is respectively ..... and..... *

2 points

0.9 A,0.3 A

0.3 A,0.9A

0.6 A,0.6A

9A,3A

To measure the potential difference between the two ends of a resister,....... is used *

2 points

Voltmeter

ammeter

Galvanometer

Rheostat

if resistors are connected in series,then..... *

2 points

The effective resistance is equal to the sum of of raciprocals of the resistances

The effective resistance is equal to the product of the resistances

The effective resistance is equal to the sum of the resistances

The effective resistance is always less than the highest individual resistance

On which of the following factors the resistance of conductor is not dependent upon at constant temperature? *

2 points

length of the conductor

Area of cross section of the conductor

Material of the conductor

Electric current flowing through the conductor

The SI unit of current is..... *

2 points

Coulomb

Volt

Ampere

Ohm

If two resistors of different materials and different resistances are connected in series then what is equal in both the resistors? *

2 points

potential difference

Current

Resistivity

Density

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