ICSE Class 10th Science Chapter 8 - Current Electricity Important Questions with Answers

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Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate the ratio of the powers delivered by them.

Question 2.

5 bulbs are connected in series in a room. One bulb is fused. It is removed and remaining 4 bulbs are again connected in series to the same circuit. What will be the effect on the following physical quantities?

(Increases, Decreases, Remain Same).

Resistance
Intensity of light

Question 3.

A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.

Question 4.

The voltage - current readings of a certain material are shown in the table given below:

Voltage (V)	10 V	20 V	30 V
Current (I)	2 A	3 A	4 A

Study the table.

State whether the conductor used is ohmic or non-ohmic.
Justify your answer.
State Ohm's law.

Question 5.

Study the diagram:

Calculate the total resistance of the circuit.
Calculate the current drawn from the cell.
State whether the current through 10 ? resistor is greater than, less than or equal to the current through the 12 ? resistor.

Question 6.

The graph of voltage vs current for four different materials is shown below.

Which of these four materials would be used for making filament of bulb?

Question 7.

The circuit depicted in the figure is employed for studying Ohm's Law. Instead of using a standard resistor, a student opts for a glass tube filled with mercury (tube 1), connected to the circuit through two electrodes E1 & E2. He records the readings of the ammeter and voltmeter, thereby calculating the resistance. The student repeats the experiment by substituting tube 1 with tube 2, where the same amount of mercury fills the tube 2.

Neglecting internal resistance of the cell use (> or < or =) to compare

the resistance in both the cases.
the voltmeter readings in both the cases.
the specific resistance in both the cases.

Question 8.

Observe the given circuit diagram and answer the questions that follow:

Calculate the resistance of the circuit when the key K completes the circuit.
Calculate the current through 3? resistance when the circuit is complete.

Question 9.

On what factors does the resistance of a conductor depend?

Question 10.

Which particles are responsible for current in conductors?

Question 1.

What are the SI units of specific resistance?

Question 2.

The diagram below shows a cardboard on which iron filings are kept. A wire bent in the form of a loop is seen passing through the cardboard. When current flows through it, the iron filings arrange themselves as shown below.

State the polarities of the battery at A and B.
State the effect on the magnetic field if an iron rod is held along the axis of the coil.
State one way to:
1. Change the polarity of the coil.
2. Decrease the strength of the magnetic field around the coil.

Question 3.

An electric bulb of 300? draws a current of 0.4 A. Calculate the power of the bulb and the potential difference at its ends.

Question 4.

State two causes of energy loss in a transformer.

Question 5.

The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.

Question 6.

The music system draws a current of 400 mA when connected to a 12 V battery.

What is the resistance of the music system?
The music system if left playing for several hours and finally the battery voltage drops and the music system stops playing when the current drops to 320 mA. At what battery voltage does the music system stop playing?