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Revision Topic 123

Total questions: 45

Worksheet time: 23mins

Name
Class
Date
1.
Two like charges
a)
 neutralize each other.
b)
repel each other. 
c)
must be neutrons. 
d)
attract each other.
2.
What direction are the electric field lines around an electron?
a)
towards the charge
b)
away from the charge
3.
What does it mean when the electric field lines are close together?
a)
the field is positive
b)
the field is negative
c)
The field is strong
d)
the field is weak
4.

What direction are the electric field lines around a proton?

a)

towards the charge

b)

away from the charge

5.
When distance increases, electrostatic force ____________; we call this relationship ____________ proportional
a)
decreases;directly
b)
decreases;inversely
c)
increases;inversely
d)
increases;directly
6.

Recap:

Coulomb’s law states that the force between two charged objects will __________ when the magnitude of the object’s charge increases.

Coulomb’s law also states that the force between two charged objects will __________ when the distance between objects increases.

a)

increase; increase

b)

increase; decrease

c)

decrease; increase

d)

decrease; decrease

7.

Which two particles are attracted to each other?

a)

Two neutrons

b)

A proton and an electron

c)

Two protons

d)

An electron and a neutron

8.

When the distance between two charges is halved, the electrical force between the charges

a)

quadruples

b)

reduces to one fourth

c)

halves

d)

doubles

9.

list the properties of electric field lines

a)

they never cross each other

b)

they move from positive to the negative charges

c)

they can cross each other at strong fields

d)

they are parallel at uniform fields

10.
Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
a)
+,+
b)
+,-
c)
-,+
d)
-,-
11.

Identical charges A, B, and C are located between two oppositely charged parallel plates, as shown in the diagram below. The magnitude of the force exerted on the charges by the electric field between the plates is

a)

least on A and greatest on C

b)

the same on A and C, but less on B

c)

the same for A, B, and C

d)

greatest on A and least on C

12.

If a unit positive charge is taken from one point to another over an equipotential surface, then

a)

Work is done on the charge

b)

Work is done by the charge

c)

Work done is constant

d)

No work is done

13.
A region of space contains a uniform electric field, directed toward the right, as shown in the figure. Which statement about this situation is correct?
a)
The potential at point A is the highest, the potential at point B is the second highest, and the potential at point C is the lowest.
b)
The potential at points A and B are equal, and the potential at point C is lower than the potential at point A.
c)
The potential at all three locations is the same.
d)
The potentials at points A and B are equal, and the potential at point C is higher than the potential at point A.
14.

Which one of the following is a vector quantity?

I   Electric field

II  Electric force

III Electric potential

a)

I, II and III

b)

I and II only

c)

 I and III only

d)

  I only

15.

What is the function of a capacitor?

a)

To capacitate

b)

To resist current

c)

To consume energy as heat

d)

To store energy as electric charge

16.

Which of the following is symbol of capacitor ?

a)
b)
c)
d)
17.

Capacitance is measured in___________

a)

Coulombs

b)

Farads

c)

Hz

d)

Volts

18.

The insulating layer of a capacitor is called the

a)

plate

b)

conductors

c)

dielectric

d)

terminals

19.

What is a dielectric?

a)

Two electrons flowing in a circuit

b)

The two metal plates in a capacitor

c)

Insulating material between the plates in a capacitor

d)

Conducting liquid between electrodes in a battery

20.

When a slab of dielectric material is introduced between the parallel plates of a capacitor which remains connected to a battery, then charge on plates relative to earlier charge

a)

Is less

b)

Is same

c)

Is more

d)

May be less or more depending on the nature of the material introduced

21.
Which is the Q vs t graph for the charging process of a capacitor?
a)
a
b)
b
22.

What are the factors that influence capacitance of a capacitor?

a)

Surface area

b)

Temperature

c)

Dielectric

d)

Length

e)

Distance between plates

23.

If dielectric is inserted when the battery is connected the potential difference is

a)

increases

b)

constant

c)

decreases

d)

zero

24.

If dielectric is inserted when the battery is connected the capacitance is

a)

decreases

b)

increases

c)

constant

d)

zero

25.

If dielectric is inserted when the battery is disconnected the potential difference is

a)

increases

b)

constant

c)

decreases

d)

zero

26.

How is the capacitance of a parallel-plate capacitor affected by the distance between the plates ?

a)

C is directly proportional to the area A of each plate

b)

C is inversely proportional to the distance d between the plates

c)

C is partially proportional to the area A of each plate

d)

C is not affected by the area A of each plate

27.

During charging a capacitor through a resistor

a)

the current in the circuit increases linearly with time

b)

the current in the circuit decreases linearly with time

c)

the current in the circuit increases exponentially with time

d)

the current in the circuit decreases exponentially with time

28.

During discharging a capacitor through a resistor

a)

the current in the circuit increases linearly with time

b)

the current in the circuit decreases linearly with time

c)

the current in the circuit increases exponentially with time

d)

the current in the circuit decreases exponentially with time

29.

In RC circuit, and when charging the capacitor, the time constant (τ) is the time needed for the charge of the capacitor to reach ----------- of its maximum charge.

a)

50%

b)

63%

c)

86%

d)

37%

30.

In the RC discharging circuit, time constant (τ) is the time taken by the charge of the capacitor to reach ---------------- of the initial charge.

a)

63%

b)

37%

c)

50%

d)

67%

31.

Microscopic model of current:

In metal, free electrons that move freely and randomly will experience electric force when electric field is applied. They will tend to (a)   to the direction of the electric field.

32.

Microscopic model of current :

Electric current is flowing in the opposite direction of the (a)   .

33.

Which of the following is incorrect about the effect of temperature on electrical resistance in metal?

a)

The electrical resistance in metal always increases with increasing temperature.

b)

When the temperature increases, the number of free electrons per unit volume in metal remains unchanged.

c)

Metal atoms in the crystal lattice vibrate with greater amplitude and cause the number of collisions between the free electrons and metal atoms increase. Hence the resistance in the metal will decreases.

d)

Metal atoms in the crystal lattice vibrate with greater amplitude and cause the number of collisions between the free electrons and metal atoms increase. Hence the resistance in the metal increases.

34.

Choose 3 options that is correctly described the factors that influence the internal resistance?

a)

Inversely proportional to surface area of the electrodes in electrolyte

b)

Inversely proportional to temperature of electrolyte

c)

Inversely proportional to distance between the electrodes

d)

Inversely proportional to concentration of electrolyte

35.

Define electric current

a)

the total charge, Q flowing through the area per unit time, t.

b)

the total current, I flowing through the area per unit time, t.

c)

the rate of capacitance flow through a conductor.

d)

the rate of current flow through a conductor

36.

Resistivity is defined as .....

a)

the capacitance of a unit length per unit cross-sectional area of the material

b)

the resistance of a unit length per unit cross-sectional area of the material

c)

the capacitance of a unit cross-sectional area per unit length of the material

d)

the resistance of a unit cross-sectional area per unit length of the material

37.

What type of quantity does the current belongs to?

a)

a base and vector quantities

b)

a base and scalar quantities

c)

a derived and vector quantities

d)

a derived and scalar quantities

38.

From the equation, we know that the resistance of a conductor depends on..?

a)

length of conductor

b)

cross sectional area

c)

type of material

d)

volume of the wire

39.

Kirchhoff's 1st law is

a)

Σ Iin =Σ Iout \Sigma\ I_{in\ }=\Sigma\ I_{out\ }  

b)

Σ Vin =Σ Vout \Sigma\ V_{in\ }=\Sigma\ V_{out\ }  

c)

Σ V =0\Sigma\ V\ =0  

d)

Σ V=Σ IR \Sigma\ V=\Sigma\ IR\  

40.

Kirchhoff's 2nd law is

a)

Σ Iin =Σ Iout \Sigma\ I_{in\ }=\Sigma\ I_{out\ }  

b)

Σ Vin =Σ Vout \Sigma\ V_{in\ }=\Sigma\ V_{out\ }  

c)

Σ V =0\Sigma\ V\ =0  

41.

Which of the statement are true for electrical power?

a)

the energy liberated per unit time in the electrical device

b)

the energy liberated in electrical device

c)

unit Watt (W)

d)

a scalar quantity

e)

a vector quantity

42.

As the length of a wire increases, the resistance of the wire will

a)

increase

b)

decrease

c)

stay the same

43.

Which wire would have greater resistance?

a)

The Blue Wire

b)

The Red Wire

c)

They would have equal resistance

44.

which statements are true for emf?

a)

is stand for electromotive force

b)

the power by the battery

c)

the energy by the power source

d)

the work done by in bringing a unit of test charge

45.

Internal resistance is

a)

resistance because of the chemical inside the battery

b)

resistance due to the wire in the circuit

c)

resistance due to back emf

d)

resistance due to material of the wire used in the circuit

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