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

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

Name the radiations of wavelength

(i) Longer than 8 x 10 ^-7 m

(ii) shorter than 4 x 10 ^-7 m.