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

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?

Define Lever