(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

Calculate the current flowing through a wire of resistance 5 Ω connected to a battery of potential difference 3 V.

Draw a diagram to represent the magnetic field lines along the axis of a current carrying solenoid. Mark arrows to show the direction of current in the solenoid and the direction of magnetic field lines.

In an experiment of verification of Ohm’s law following observations are obtained.

Draw a V-I graph and use this graph to find:

1. the potential difference V when the current I is 0.5 A,
2. the current I when the potential difference V is 0.75 V,
3. the resistance in a circuit.

The adjacent diagram shows a small magnet placed near a solenoid AB. Current is switched on in the solenoid by pressing the key K.

1. State the polarity at the ends A and B.
2. Will the magnet be attracted or repelled? Give a reason for your answer.

The following diagram shows a spiral coil wound on a hollow carboard tube AB. A magnetic compass is placed close to it. Current is switched on by closing the key.

1. What will be the polarity at the ends A and B?
2. How will the compass needle be affected? Give reason.

State two ways by which the magnetic field due to a current carrying solenoid can be made stronger.

Why does a current carrying freely suspended solenoid rest along a particular direction? State the direction in which it rests.

What effect will there be on a magnetic compass when it is brought near a current carrying solenoid?

How is the magnetic field due to a solenoid carrying current affected if a soft iron bar is introduced inside the solenoid?

A current carrying solenoid behaves like a ______.

A wire of resistance 3 ohm and length 10 cm is stretched to length 30 cm. Assuming that it has a uniform cross section, what will be its new resistance?

A current carrying solenoid when freely suspended, it always rests in ______ direction.

A wire of resistance 9 ohm having length 30 cm is tripled on itself. What is its new resistance?

1. What name is given to a cylindrical coil of diameter less than its length?
2. If a piece of soft iron is placed inside the coil mentioned in part (a) and current is passed in the coil from a battery, what name is then given to the device so obtained?
3. Give one use of the device mentioned in part (b).

What length of copper wire of resistivity 1.7 × 10^-8 Ω m and radius 1 mm is required so that its resistance is 2Ω? 

How would you connect two resistors in series? Draw a diagram. Calculate the total equivalent resistance.  

Show by a diagram how two resistors R₁ and R₂ are joined in parallel. Obtain an expression for the total resistance of the combination. 

In the circuit shown below in Fig, calculate the value of x if the equivalent resistance between A and B is 4 Ω.

How does an increase in the temperature affect the specific resistance of a : 
(i) Metal and
(ii) Semiconductor ?

Calculate the effective resistance across AB?