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Current Electricity (Compiled)

Total questions: 50

Worksheet time: 55mins

Name
Class
Date
1.
In a series circuit  with 4 bulbs:
a)
a switch is never used
b)
all of the bulbs become dimmer if another bulb is added
c)
There are many paths for electricity to take
d)
the remaining 3 bulbs stay lit if one burns out
2.
If bulb 1 burns out, what will occur?
a)
bulbs 2 and 3 will go out
b)
bulbs 2 and 3 receive more volts
c)
bulbs 2 and 3 will stay lit
d)
nothing will happen
3.
This image represents what type of circuit?
a)
open
b)
wire
c)
series
d)
parallel
4.

Though we specify the direction of direct current by putting an arrow, why is it not considered a vector quantity ?

a)

Because current does not obey the laws of vector addition

b)

Because charge is Quantized

c)

Because conventional direction of current is only virtual

d)

Because current obeys Kirchhoff Laws

5.

Current carriers in Electrolyte are/is

a)

Free electrons

b)

Holes

c)

Electrons and holes both

d)

Positive and negative ions

6.

An electrical junction has three wires A, B and C connected to it. Wire A carries 4.2 A going in, wire B carries 2.6 A going out. What does wire C carry?

a)

1.6 A going in

b)

1.6 A going out

c)

6.8 A going in

d)

6.8 A going out

7.

Current is shared between two resistors of 3 Ω and 6 Ω, if the current in the 6 Ω is 12 A what is the total incoming current?

a)

24 A

b)

36 A

c)

18 A

d)

72 A

8.

How do you measure voltage, current, and resistance in a physical circuit?

a)

Multimeter

b)

Voltmeter

c)

Ohmeter

d)

Odometer

9.

"The sum of all voltage drops in a series circuit equals the total applied voltage." This is know as what?

a)

Ohm's Law

b)

Kirchhoff's Voltage Law

c)

Kirchhoff's Current Law

d)

Bolen's Law

10.

What does Kirchhoff's second law show?

a)

conservation of charge

b)

conservation of energy

c)

In any closed loop, the sum of the e.m.f. is equal to the sum of the products of the current and the resistance (potential difference).

d)

The sum of the current entering a junction is the sum of the current leaving the junction.

11.

Given the direction of the current shown. Which side of the resistor has the high electric potential energy?

a)

left side is higher

b)

right side is higher

12.
  1. Kirchhoff's junction rule is a reflection of
a)

Conservation of current density vector

b)

Conservation of charge and no accumulation of charge at the the junction

c)

the momentum with which a charged particle approaches a junction is unchanged as the charged particle leaves the junction

d)

Conservation of energy

13.

Which of the following characteristics of electrons determines the current in a conductor?

a)

Drift velocity alone

b)

Thermal velocity alone

c)

Both A and B

d)

Neither A nor B

14.

13. Drift velocity vd varies with the intensity of electric field as per the relation

a)

(a) vd ∝ E

b)

(b) vd ∝ 1/E

c)

(c) vd = constant

d)

(d) vd ∝ E²

15.

15. From the graph between current I and voltage V shown below, identify the portion corresponding to negative resistance

a)

(a) AB

b)

(b) BC

c)

(c) CD

d)

(d) DE

16.

16. Which of the following I-V graph represents ohmic conductors?

a)

(a) A

b)

(b) B

c)

(c) C

d)

(d) D

17.

20. The resistivity of alloy manganin is

a)

(a) Nearly independent of temperature

b)

(b) Increases rapidly with increase in temperature

c)

(c) Decreases with increase in temperature

d)

(d) Increases rapidly with decrease in temperature

18.

21. In parallel combination of n cells, we obtain

a)

(a) more voltage

b)

(b) more current

c)

(c) less voltage

d)

(d) less current

19.

Voltage is a form of:

a)

Kinetic energy

b)

Potential energy

c)

both Potential and Kinetic energy

d)

None of the above

20.

Ohm's law can be written in vector form as ______________

a)

 J→\overrightarrow{J}   = σ\sigma  E→\overrightarrow{E}  

b)

  J→\overrightarrow{J}  = ρ\rho  E→\overrightarrow{E}  

c)

  J→\overrightarrow{J}  = R  E→\overrightarrow{E}  

21.

The quantity which remains same in series combination of resistors is ________________

a)

Voltage

b)

Current

c)

Power

22.

Expression for internal resistance is given by _______________

a)

r = (ξ − V)I\frac{\left(\xi\ -\ V\right)}{I}

b)

r = (ξ − I)V\frac{\left(\xi\ -\ I\right)}{V}

c)

r = (V − I)ξ\frac{\left(V\ -\ I\right)}{\xi}

23.

kilowatt hour is the commercial unit of --------------

a)

Electric power

b)

Electrical energy

c)

Time

24.

Kirchhoff's second law is in accordance with law of conservation of ------------------

a)

Current

b)

Charge

c)

Energy

25.

The mathematical expression of Kirchhoff's first law is ------------

a)

∑xy\sum_x^y V = 0

b)

∑xy\sum_x^y I = 0

c)

∑xy\sum_x^y R = 0

26.

If 4 resistances P, Q, R, and S are connected as shown in the figure,then we get   PQ\frac{P}{Q} =  RS\frac{R}{S}   .This relation is known as ---------

a)

Voltmeter principle

b)

Potentiometer principle

c)

Wheatstone's principle

27.

Working principle of Potentiometer is ----------------

a)

Ohm's law

b)

Wheatstone's principle

c)

emf ∝\propto balancing length

28.

If we get the resistance of the wire as 6 ohm,on introducing a 2 ohm resistance in the resistance box, in a meter bridge circuit, find the corresponding balancing length.

a)

3 cm

b)

25 cm

c)

75 cm

29.

The expression of internal resistance of the cell,obtained using potentiometer is given by ---------------

a)

r = R l 1l 2\frac{l\ _1}{l\ _2}

b)

r = R (l 1 − l2 )l1\frac{\left(l\ _1\ -\ l_2\ \right)}{l_1}

c)

r = R (l1 − l2)l2\frac{\left(l_1\ -\ l_2\right)}{l_2}

30.

The V - I graph of a conductor at 3 different temperatures T1, T2, and T3 are given.At what temperature, is the resistance highest?

a)

T1

b)

T2

c)

T3

31.

When is the Wheatstone bridge is most sensitive ?

a)

When all the four resistances of the bridge are equal

b)

When the bridge is balanced

c)

When high amount of current is flowing through the bridge

d)

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

32.

What will be the new resistivity of a metallic wire if it's length becomes double

a)

Increases two times

b)

Becomes half

c)

Increases four times

d)

Remains same

33.

Wheatstone is one type of ______ bridge

a)

AC

b)

DC

c)

DAC

d)

ADC

34.

14. For measurement of potential difference, a potentiometer is preferred over voltmeter because

a)

(a) potentiometer is more sensitive than voltmeter.

b)

(b) the resistance of potentiometer is less than voltmeter.

c)

(c) potentiometer is cheaper than voltmeter.

d)

(d) potentiometer does not take current from the circuit.

35.

An ideal voltmeter in physics has...

a)

...an easily readable scale

b)

...an infinite resistance

c)

...zero resistance

d)

...a negligible internal resistance

36.

In Physics, an ideal ammeter has...

a)

...a 10A fuse

b)

...infinite resistance

c)

...an autoranging function

d)

...zero resistance

37.

What is emf?

a)

the electro motive "force" or the force on electrons

b)

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

c)

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

d)

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

38.

Name the material used for making potentiometer wire

a)

Copper

b)

Aluminium

c)

Brass

d)

Manganin

e)

silver

39.

How to increase the sensitivity of a potentiometer?

a)

1. Connect a resistance series to the primary circuit of the potentiometer

b)

2. Use a cell of low emf in the primary circuit

c)

3. Increase the length of the potentiometer wire

d)

only 1 & 2

e)

1, 2 & 3

40.

Copper wires are not used in the construction of potentiometer because

a)

low resistance

b)

high temperature coefficient

c)

low resistance & high temperature coefficient

d)

expensive

e)

non availability

41.

What is the use of a potentiometer?

a)

1. comparison of emf's of two primary cells

b)

2. finding internal resistance of a cell

c)

3. can be used as a variable resistor

d)

1 & 2

e)

1,2 & 3

42.

Name the factors decide internal resistance of a cell

a)

1. temperature

b)

2. nature of the electrolyte

c)

3. nature of the electrodes

d)

4.distance between the electrodes

e)

1,2,3 & 4

43.

What happens to the balancing length if the value of the variable resistance R is increased?

a)

decreases

b)

increases

c)

no change

d)

can not predict

44.

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

a)

(a) change in previous direction

b)

(b) not change

c)

(c) change in opposite direction

d)

(d) none of these.

45.

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

a)

R

b)

R/2

c)

R/4

d)

2R

46.

Select the correct statement:

a)

The current in parallel resistors is always equal.

b)

The sum of the sources of EMF and volt-drops in a closed loop is zero.

c)

The sum of the currents in a closed loop is zero.

d)

The sum of the voltages at a node is zero.

47.

"The total current in a parallel circuit equals the sum of the individual branch currents."

a)

Ohm's Law

b)

Kirchhoff's Voltage Law

c)

Kirchhoff's Current Law

d)

Bolen's Law

48.

If a billion electrons enter a point in 1 s, then number of electrons

leaving that point in 1 s are

a)

2 billion

b)

3 billion

c)

1 billion

d)

10 billion

49.

1 V is equal to

a)

1 J C-1

b)

1 J-1C

c)

2 J-1C

d)

2 J C-1

50.

Combined resistance of 5 Ω and 10 Ω are connected in parallel is equal to

a)

3/10 Ω

b)

10/3 Ω

c)

20/3 Ω

d)

15/2 Ω

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