Current Electricity

Current Electricity

Multiple Choice

The current from the battery in circuit diagram shown is

• 1A

• 2A

• 1.5A

• 3 A

Multiple Choice

Four resistances are connected in a circuit in the given figure. The electric current flowing through 4 ohm and 6 ohm resistance is respectively

• 2 amp and 4 amp

• 1 amp and 2 amp

• 1 amp and 1 amp

• 2 amp and 2 amp

Multiple Choice

What is the current (i) in the circuit as shown in figure

• 2 A

• 1.2 A

• 1 A

• 0.5 A

Multiple Choice

In circuit shown below, the resistances are given in ohms and the battery is assumed ideal with emf equal to 3 volt. The

voltage across the resistance R₄ is

• 0.4 V

• 0.6 V

• 1.2 V

• 1.5 V

Multiple Choice

Current of 4.8 amperes is flowing through a conductor. The number of electrons per second will be

• 3 ×10¹⁹

• 7.68 ×10 ²¹

• 7.68 ×10 ²⁰

• 3 ×10 ²⁰

Multiple Choice

A certain wire has a resistance R . The resistance of another wire identical with the first except having twice its diameter is

• 2 R

• 0.5 R

• 4 R

• 0.5 R

Multiple Choice

5 amperes of current is passed through a metallic conductor. The charge flowing in one minute in coulombs will be

• 5

• 12

• 1/12

• 300

Multiple Choice

An electric wire of length ‘I’ and area of cross-section a has a resistance R ohms. Another wire of the same material having same length and area of cross-section 4a has a resistance of

• 4 R

• R/4

• R/16

• 4R

Multiple Choice

The resistance of a wire is R. If the length of the wire is doubled by stretching, then the new resistance will be

• 2 R

• 4 R

• R

• R/4

Multiple Choice

All of the following statements are true except

• Conductance is the reciprocal of resistance and is measured in Siemens

• Ohm’s law is not applicable at very low and very high temperatures

• Ohm’s law is applicable to semiconductors

• Ohm’s law is not applicable to electron tubes, discharge tubes and electrolytes

Multiple Choice

There are 8 equal resistances R. Two are connected in parallel, such four groups are connected in series, the total resistance of the system will be

• R/2

• 2R

• 4R

• 8R

Multiple Choice

Equivalent resistance between A and B will be

• 2.3

• 18

• 6.3

• 3.6

Multiple Choice

The effective resistance between the points A and B in the figure is

• 5Ω

• 2Ω

• 3Ω

• 4Ω

Multiple Choice

Four wires of equal length and of resistances 10 Ω each are connected in the form of a square. The equivalent resistance

between two opposite corners of the square is

• 10Ω

• 20Ω

• 40Ω

• 10/4Ω

Multiple Choice

Two resistors are connected (a) in series (b) in parallel. The equivalent resistance in the two cases are 9 Ω and 2 Ω respectively. Then the resistances of the component resistors are

• 2 Ωand 7 Ω

• 3 Ω and 6 Ω

• 3 Ω and 9 Ω

• 5 Ω and 4 Ω

Multiple Choice

The equivalent resistance of the arrangement of resistances shown in the adjoining figure between the points A and B is

• 6 Ω

• 8 Ω

• 16 Ω

• 24 Ω

Multiple Choice

In the network of resistors shown in the adjoining figure, the equivalent resistance between A and B is

• 54 Ω

• 18 Ω

• 36 Ω

• 9 Ω

Multiple Choice

Three equal resistances each of value R are joined as shown in the figure. The equivalent resistance between M and N

is

• R

• 2R

• R/2

• R/3

Multiple Choice

A uniform wire of 16 Ω is made into the form of a square. Two opposite corners of the square are connected by a wire of resistance 16Ω . The effective resistance between the other two opposite corners is

• 32 Ω

• 20Ω

• 8 Ω

• 4 Ω

Multiple Choice

What is the equivalent resistance between A and B in the figure below if

• 9 Ω

• 12Ω

• 15Ω

• none

Multiple Choice

Equivalent resistance between the points A and B is (in Ω)

• 1/5

• 1 1/4

• 2 1/3

• 3 1/2

Multiple Choice

In the given figure, the equivalent resistance between the points A and B is

• 8 Ω

• 6 Ω

• 4 Ω

• 2 Ω

Multiple Choice

If all the resistors shown have the value 2 ohm each, the equivalent resistance over AB is

• 2 Ω

• 4 Ω

• 5/3 Ω

• 8/3 Ω

Multiple Choice

Four resistances 10 Ω, 5 Ω, 7 Ω and 3 Ω are connected so that they form the sides of a rectangle AB, BC, CD and DA respectively. Another resistance of 10 Ω is connected across the diagonal AC. The equivalent resistance between A and

B is

• 2 Ω

• 5 Ω

• 7 Ω

• 10 Ω

Multiple Choice

The current in the adjoining circuit will be

• 1/45 A

• 1/15 A

• 1/10 A

• 1/5 A