Free Printable Current Electricity XII Physics

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Current Electricity XII Physics

Total questions: 25

Worksheet time: 15mins

Name

Class

Date

What is the power of a 3V light bulb with 20 A running through it?

0.15W

60W

6.67W

A 2.0-ohm resistor and a 4.0-ohm resistor are connected in series with a 12-volt battery. If the current through the 2.0-ohm resistor is 2.0 amperes, the current through the 4.0-ohm resistor is

1.0 A

2.0 A

3.0 A

4.0 A

What is emf?

the electro motive "force" or the force on electrons

the electromotive "force" or the Voltage of a cell measured when there is no current flowing

the electromotive "field" or the Voltage of a cell measured when there is no current

the electromotive "force" or Voltage of a cell measured when connected to a circuit

The following graph shows the variation of terminal potential difference V, across a combination of three cells in series to a resistor, versus the current. Calculate the emf and internal resistance of each cell

E = 6 V & r = 3 ohm

E = 2 V & r = 1 ohm

E = 6 V & r = 1 ohm

E = 2 V & r = 3 ohm

E = 1 V & r = 1 ohm

Name the factors decide internal resistance of a cell

1. temperature

2. nature of the electrolyte

3. nature of the electrodes

4.distance between the electrodes

1,2,3 & 4

Find the potential difference across the 50 ohm resistance?

10 V

5 V

2.5 V

2 V

1 V

When a conductor carries a current, the number of conduction electrons that flow in the conductor for 10 s is 3.75 $\times10^{20}$ . What is the current that flows in the conductor?

3.8 A

4.2 A

6.0 A

10 A

Which statement is true about the drift velocity of the electrons in a current-carrying metallic conductor?

It is directly proportional to the diameter of the conductor.

It is inversely proportional to the current.

It is inversely proportional to the number of conduction electrons per unit volume.

It is directly proportional to the resistance of the conductor if the potential difference across the conductor is kept constant.

For the circuit shown, the resistances are R₁> R₂> R_3. What is true about the current through each resistor?

I₁ = I₂ = I₃

I₁ > I₂ > I₃

I₁ > I₃ > I₂

I₁ < I₃ < I₂

10.

What is the potential difference of location "B" in the circuit compared to location "A".? (for 3 points)

ΔV_AB=-16V

ΔV_AB = +16V

ΔV_AB = -2V

ΔV_AB = -22V

11.

Is the potential at "B" higher or lower than "A's" potential? (for 3 points)

"B" is higher than "A"

"B" is lower than "A"

Can't tell from the given information.

12.

Two resistors, $R_1$ and $R_2\$ are connected in PARALLEL. If $R_2\ >\ R_1$ , which among the statements is TRUE about the electric currents that passes thru each resistor?

$I_1\ >\ I_2$

$I_1=I_2$

$I_1<I_2$

13.

In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will

(a) change in previous direction

(b) not change

(d) none of these.

14.

When is the Wheatstone bridge is most sensitive ?

When all the four resistances of the bridge are equal

When the bridge is balanced

When high amount of current is flowing through the bridge

When a very low amount of current is flowing through the bridge

15.

When 2 resistances P and Q are kept in the left and right gaps of a meter bridge, the null point is obtained at 60 cm. If P is shunted by a resistance equal to half of its value, the shift in null point is

10 cm to the left

10cm to the right

26.7 cm to the left

26.7 cm to right

16.

In the wheatstone Bridge all four arms have equal resistance R and Galvanometer also has R resistance. Find the equivalent resistance of the ckt

R/2

R/4

17.

The average relaxation time during collision of electrons with atoms is

10^-14sec

10^-10

10⁴

10¹⁴

18.

If n cells of emf E and internal resistance r are connected in series, then current drawn through external resistance R is

I= nE/ R + nr

I= E/R+r/n

I= E/ R + nr

I= nE/ nR + r

19.

In a meter bridge experiment, when the resistances in the gaps are interchanged the balance point is shifted by 10cm. The ratio of the resistance is : ______________________

15:5

12:8

11:9

10:9

20.

Ohm’s law is true for

Metallic conductors at low temperature

Metallic conductors at high temperature

For electrolytes, when current passes through them

For diode when current flows

21.

Kirchhoff's current law states that

Net current flow at the junction is positive

Algebraic sum of the currents meeting at the junction is zero

No current can leave the junction without some current entering it

Total sum of currents meeting at the junction is zero

22.

According to Kirchhoff's voltage law, the algebraic some of all IR drops and e.m.fs. in any closed loop of a network is always

Negative

Positive

Determined by battery e.m.fs.

zero

23.

when a wire stretched uniformaly and its length increased to double its value, then its resistance

increased double

increased 4 times

decreased to half

decreased to quarter

24.

Volt is equivalent to .......

J /sec

Ampere / coulomb

J / coulomb

Ampere / ohm

25.

Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B.The current flowing in AFCEB will be

3V/R

V/R

V/2R

2V/R

Reset

Current Electricity XII Physics

Total questions: 25

Worksheet time: 15mins

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