Electricity and Magnetism Test

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Electricity and Magnetism Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

An electric iron consumes energy at a rate of 720 W when heating is at the maximum rate and 340 W when the heating is at the minimum. If the voltage is 220 V, what is the resistance in each case?

A
3.3 Ω, 1.5 Ω

B
67.2 Ω, 142.4 Ω

C
158.4 Ω, 748.0 Ω

D
2356.4Ω, 525.5Ω

Solution

R = V²/P where R is the resistance in Ohms, V is the voltage in Volts and P is the power in Watts.
Plugging in the values, we get the values of resistances as 67.2 ohms and 142.4 ohms.
Question 2
1 / -0

If 200 J of heat is produced every second in a 2Ω resistance, what is the potential difference across the resistor?

A
20 V

B
50 V

C
25 V

D
100 V
Question 3
1 / -0

An electric refrigerator rated 400 W operates 6 hours per day. What is the cost of the energy to operate it for 30 days at Rs. 3.00 per kWh?

A
Rs. 240.00

B
Rs. 600.00

C
Rs. 216.00

D
Rs. 135.00
Question 4
1 / -0

How much energy is used when a 110 kW appliance is used for 120 minutes?

A
110 kWh

B
132 kWh

C
220 kWh

D
120 kWh
Question 5
1 / -0

When a bar magnet immersed in a heap of iron fillings is taken out, it is observed that iron fillings stick to the surface of the bar magnet. The iron fillings would

A
stick uniformly throughout the surface of the bar magnet

B
stick randomly on the surface of bar magnet

C
have maximum concentration at the two ends of the bar magnet

D
have maximum concentration slightly away from the two ends of the bar magnet
Question 6
1 / -0

Which of the following statements are true about a permanent magnet ?

(i) It is made up of steel.
(ii) It produces a permanent magnetic field.
(iii) The magnetic field strength of a permanent magnet can be changed.
(iv) It can be easily demagnetised.
(v) The permanent magnets are not so strong.

A
Only (i), (ii) and (v)

B
Only (i) and (ii)

C
Only (i), (ii), (iv) and (v)

D
Only (i), (ii) and (iv)
Question 7
1 / -0

What happens when a conductor is placed in a magnetic field such that the current in it is in the direction parallel to the direction of magnetic field?

A
No force acts on the conductor

B
Maximum force acts on the conductor

C
Conductor experiences rotation

D
Both (2) and (3)
Question 8
1 / -0

Which of the following phenomenon is used to generate electricity in generators?

A
Electrolysis

B
Electromagnet conduction

C
Electromagnetic induction

D
Electro spectrometry
Question 9
1 / -0

Which of the following statements is NOT true?

A
A magnet can induce a current.

B
The flux can be changed by moving a magnet near a coil or moving a coil near a magnet.

C
When the magnetic flux linked with a circuit changes, an emf is induced in the circuit.

D
The phenomenon of electromagnetic induction is used to change electrical energy to mechanical energy in electric motors.

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Re-Attempt Weekly Quiz Competition

Electricity and Magnetism Test - 2

Result

Electricity and Magnetism Test - 2

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SHARING IS CARING

Question 1

3.3 Ω, 1.5 Ω

67.2 Ω, 142.4 Ω

158.4 Ω, 748.0 Ω

2356.4Ω, 525.5Ω

Solution

Question 2

20 V

50 V

25 V

100 V

Question 3

Rs. 240.00

Rs. 600.00

Rs. 216.00

Rs. 135.00

Question 4

110 kWh

132 kWh

220 kWh

120 kWh

Question 5

stick uniformly throughout the surface of the bar magnet

stick randomly on the surface of bar magnet

have maximum concentration at the two ends of the bar magnet

have maximum concentration slightly away from the two ends of the bar magnet

Question 6

Only (i), (ii) and (v)

Only (i) and (ii)

Only (i), (ii), (iv) and (v)

Only (i), (ii) and (iv)

Question 7

No force acts on the conductor

Maximum force acts on the conductor

Conductor experiences rotation

Both (2) and (3)

Question 8

Electrolysis

Electromagnet conduction

Electromagnetic induction

Electro spectrometry

Question 9

A magnet can induce a current.

The flux can be changed by moving a magnet near a coil or moving a coil near a magnet.

When the magnetic flux linked with a circuit changes, an emf is induced in the circuit.

The phenomenon of electromagnetic induction is used to change electrical energy to mechanical energy in electric motors.

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