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10th CBSE Electricity & magnetism

Total questions: 30

Worksheet time: 45mins

Name
Class
Date
1.

What kind of circuit is this?

a)

series

b)

parallel

c)

Series and parallel

d)

None of the above

2.
The total resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
3.
In a parallel circuit which of the following is the same value throughout the circuit?
a)
Voltage
b)
Current
c)
Resistance
d)
Charge
4.
The current going through the 45 ohm resistor is 
a)
0.05 amps
b)
0.2 amps
c)
0.1 amps
d)
5 amps
5.

If lamp 2 is unscrewed from its holder, what will happen to lamp1?

a)

It will stay lit

b)

It will go out

c)

It will get dimmer

d)

It will dissapear

6.
How do you calculate voltage?
a)
Current X Resistance
b)
Resistance ÷ Current
c)
Current ÷ Resistance
d)
Measure it with a ruler
7.

The unit of resistivity is

a)

Ω/m

b)

Ω/m2

c)

Ω.m

d)

Ω.m2

8.

What are the factors affecting resistance ?

a)

length

b)

Area of cross section

c)

nature of the material

d)

All of the above

9.

which of the following factor affects resistivity ?

a)

Length

b)

Area of cross section

c)

nature of the material

d)

Radius of the wire

10.

When the area of cross-section of the wire is doubled, keeping the length same, its resistance will ?

a)

Doubled

b)

Halved

c)

Subtracted by 2

d)

Added by 2

11.

This is the formula for which physical quantity  ρlA\frac{\rho l}{A}  

a)

 PP  power

b)

 VV  voltage

c)

 ρ\rho  resistivity

d)

 RR  resistance

12.

If an object has 300 excess electrons, what is its net charge? ( ee represents the elementary charge)

a)

0

b)

+300e+300e

c)

−300e-300e

d)

±300e\pm300e

13.
Graph shows that _____________
a)
Resistance is directly proportional to Area
b)
Resistance is inversely proportional to Area
c)
Resistance is a constant while Area changes.
d)
Area is a constant while resistance changes.
14.

A cylindrical conductor of length l, diameter D, and resistivity ρ has a resistance R. What is the resistance of another cylindrical conductor of length l, diameter D/2 , and resistivity ρ?

a)

8R

b)

4R

c)

2R

d)

R

15.

A wire has a resistance R.

What is the resistance when both the length and radius of the wire are doubled?

a)

R/4

b)

R/2

c)

2R

d)

4R

16.
A bulb of 100 W means that it will consume electrical energy at the rate of:
a)
100 kJ per second.
b)
100 kJ per hour.
c)
100 joules per second.
d)
100 joules per hour.
17.

What is the unit of electrical power?

a)

watt, W

b)

volt, V

c)

ampere, A

d)

ohm, Ω

18.
Electrical power can be calculated using
a)
Resistance x Voltage
b)
Voltage x Current 
c)
Voltage ÷ Current
19.
If you cut a magnet in half, what happens to the poles?
a)
One half gets the North Pole, the other half gets the South Pole
b)
Both halves get only a North Pole
c)
Both halves get only a South Pole
d)
Both halves get a North pole and a South Pole
20.

How can a wire become magnetic?

a)

point it north

b)

add a resistor

c)

heat it up

d)

run a current through it

21.

Are the magnetic field lines in the picture correct?

a)

Yes, because they point from north to south.

b)

No, because they point from north to south (they're supposed to go the other way).

c)

Yes, because the North pole is on the left in all pictures.

d)

No, because the North pole is on the left in all pictures (it's supposed to be on the right).

22.

A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:

a)

Directed to the right

b)

Directed to the left

c)

Equal to the magnetic field

d)

In the same direction as the magnetic field

23.

The magnetic field lines due to a straight wire carrying a current are

a)

straight

b)

circular

c)

parabolic

d)

elliptical

24.

A wire is parallel to the lines of the magnetic field and the current flows in the wire. Then

a)

The wire will experience a force along the direction of the magnetic field

b)

The wire will not experience any force

c)

The wire will experience the torque

d)

The wire will experience a perpendicular force

25.

In an electric motor, the direction of current in the coil changes once in each:

a)

One-fourth rotation

b)

Half rotation

c)

One rotation

d)

Doesn't change

26.

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid will

a)

Increase

b)

Decrease

c)

Remains same

d)

Becomes zero

27.
In Flemings Left hand rule what does the thumb point in the direction of?
a)
The direction of the magnetic field
b)
The direction of the current
c)
The direction of the force (movement)
d)
None of these
28.

What direction would the wire move?

a)

Up

b)

Down

c)

Left

d)

Right

29.

Which is the best method to determine the direction of the induced current?

a)

Fleming’s right-hand rule

b)

Fleming’s left-hand rule

c)

Right hand thumb rule

d)

Left hand thumb rule

30.

How to determine the polarity of the ends of the solenoid?

a)
b)
c)
d)

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