Free Printable Demo Test

1.

You acquire 50C charge while rubbing your legs on carpet, find the number of electron in your body during this process?

a)

3.125*10¹⁹ electron

b)

3.125*10^-19 electron

c)

3.125*10²⁰electron

d)

3.125*10^{-20 electron}

2.

Two particles A and B having charges 8*10^-6 C and -2*10^-6C are held at a separation of 20 cm. Where should a third charged be placed so that it does not experience a net electric force?

a)

x=10 cm

b)

x=20 cm

c)

x=30 cm

d)

x= 15 cm

3.

How much work is done by a battery when 10C of charge is passed through it by a potential difference of 12 V?

a)

0.83J

b)

120J

c)

1.2J

d)

None of the above

4.

An electric dipole is placed in a uniform electric field. The net electric force on the dipole...

a)

Is always zero

b)

Depends on the orientation of the dipole

c)

Can never be zero

d)

Depends on the strength of the dipole

5.

Find the force between a proton and electron when they revolve in a circle of radius o.53 Angstrom.

a)

2.8*10⁸ N

b)

8.2*10^-8 N

c)

6.2*10¹⁰ N

d)

2.3*10⁶ N

6.

A point charge +q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is

a)

directed perpendicular to the plane and away from the plane

b)

directed perpendicular but towards the plane

c)

directed radially away from the point charge

d)

directed radially towards from the point charge

7.

What will be the total flux through the faces of a cube with side of length a if charge q is placed at a corner of the cube

a)

q/4e_o

b)

q/8e_o

c)

q/2e_o

8.

A capacitance of 2μF is required in an electrical circuit across a pd of 1kV. A large number of 1μF capacitors are available which can withstand a pd of not more than 300V. The minimum number of capacitors required to achieve this is

a)

24

b)

32

c)

2

d)

16

9.

Two particles A and B having charges 8*10^-6 C and -2*10^-6C are held at a separation of 20 cm. Where should a third charged be placed so that it does not experience a net electric force?

a)

x=10 cm

b)

x=20 cm

c)

x=30 cm

d)

x= 15 cm

10.

Which of the following labeled points is in the region with the strongest force of electric charge

a)

A

b)

B

c)

C

d)

D

11.

A pith ball has an electric charge +2q, and it feels a force F when placed a distance d from a second pith ball with an electric charge -q. When the second pith ball is charged to -3q, the force on the pith ball is ---.

a)

6F

b)

2F

c)

3F

d)

F

12.

What is the value of minimum force acting between two charges placed at 1 m apart from

each other

a)

$Ke^2$

b)

Ke

c)

Ke/4

d)

$\frac{ke^2}{2}$

13.

when an electric dipole is held at an angle in a uniform electric field,the net force F AND TORQUE $\zeta$ on the dipole are

a)

F=0, $\zeta$ =0

b)

F $\ne$ 0 ,,, $\zeta$ $\ne$ 0

c)

F=0,, $\zeta$ $\ne$ 0

d)

F $\ne$ $\zeta$ =0

14.

Potential energy of an electric dipole held at an angle $\theta$ in a uniform electric field is zero ,,when $\theta$ is

a)

$0^{\degree}$

b)

$90^{\degree}$

c)

$180^{\degree}$

d)

$360^{\degree}$

15.

The dimensional formula of electric flux is

a)

$M^1$ $L^2$ $T^{-2}$ $A^{-1}$

b)

$M^{-1}$ $L^3$ $T^{-3}$ $A$

c)

$M^1$ $L^3$ $T^{-3}$ $A^{-1}$

d)

$M^1$ $L^{-3}$ $T^{-3}$ $A^{-1}$

16.

Electric field intensity due to thin infinite plane sheet

a)

$E=\frac{\sigma}{2\epsilon_0}$

b)

$E=\frac{\sigma}{\epsilon_0}$

c)

$E=O$

d)

$E=\frac{\lambda}{2\pi\epsilon_0R}$

17.

Calculate potential at a point P DUE TO A CHARGE $4\times10^{-7C}$ located 9 cm away

a)

$4\times10^4$ volt

b)

4 volt

c)

none

18.

Two like charges

a)

neutralize each other.

b)

repel each other.

c)

must be neutrons.

d)

attract each other.

19.

which is the field for opposite charges

a)

b)

c)

d)

20.

2 charged objects both feel a force of 200 N. If q1 becomes 3 times bigger, what is the new force

a)

203

b)

600

c)

66.7

d)

1800

21.

2 charges feel a force of 40 N. if we cut the distance between them in half, what is the new force they feel

a)

20

b)

80

c)

160

d)

10

22.

2 charges are 20 cm apart and feel a force of 500 N. if the distance between them becomes 60 cm, what is the new force

a)

4500

b)

540

c)

1500

d)

55.6

23.

Two similar metal spheres, A and B, have charges of +2.0 x 10^-6 coulomb and +1.0 x 10^-6 coulomb, respectively. The magnitude of the electrostatic force on A due to B is 4.0N newtons. What is the magnitude of the electrostatic force on B due to A?

a)

2.0N

b)

4.0N

c)

8.0N

d)

1.0N

24.

A cell of emf (E) and internal resistance (r) draws a current (I). Write a relation between terminal voltage (V) in terms of E,I,r. ?

(a)

25.

As the temperature of a conductor increases both it's Resistivity and Conductivity change.Will the ratio of its Resistivity and conductivity

a)

Increases

b)

Decreases

c)

Remain same

d)

None of these

26.

The circuit diagram shows a 4.0 Ω resistor and an 8.0 Ω resistor connected to a 6.0V battery. What is the current in the battery?

a)

0.50A

b)

0.75A

c)

1.50A

d)

2.00A

27.

The internal resistance of a cell is the resistance of

a)

Material used in the cell

b)

Electrolyte used in the cell

c)

Electrodes of the cell

d)

vessel of the cell

28.

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

29.

SI unit of current density is (a)

30.

What is the potential difference across the combination of cells. The n number of identical cells ε are charged by ε'

a)

(εr + ε'R)/(R+nr)

b)

(R+nr)/(εr + ε'R)

c)

(εR + ε'r)/(R+nr)

d)

(εR + εr)/(R+nr)

31.

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

32.

------ is called the increase in resistance per unit original resistance per degree kelvin rise of temperature

a)

Thermal velocity

b)

temperature coefficient of electrical resistivity

c)

temperature coefficient of electrical resistance

d)

conducance

33.

72 cells of internal resistance 5 Ohm and emf 2.0 volt are used to send current through an external circuit of resistance 10 Ohm. What is the maximum current in the circuit

a)

6/35 amp

b)

12/35 Amp

c)

24/35 Amp

d)

35/24 Amp

34.

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

35.

The potential difference between the terminals of a battery is 10V and internal resistance 1 $\Omega$ drops to 8V when connected across an external resistor find the resistance of the external resistor.

a)

40 ohm

b)

0.4 ohm

c)

4M ohm

d)

4 ohm

Demo Test

Total questions: 35

Worksheet time: 3hrs 55mins

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