(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Draw the pattern of magnetic field lines near a bar magnet placed with its North Pole pointing towards the geographic North. Indicate the position of neutral points by marking X.

State whether the magnetic field lines in part (a) represent a uniform magnetic field or non-uniform magnetic field?

Figure. shows a bar magnet placed on the table top with its north pole pointing towards south. The arrow shows the north-south direction. There are no other magnets or magnetic materials nearby.

Insert two magnetic field lines on either side of the magnet using  arrow head to show the direction of each field line.

Figure. shows a bar magnet placed on the table top with its north pole pointing towards south. The arrow shows the north-south direction. There are no other magnets or magnetic materials nearby.

Indicate by crosses, the likely positions of the neutral points.

Figure. shows a bar magnet placed on the table top with its north pole pointing towards south. The arrow shows the north-south direction. There are no other magnets or magnetic materials nearby.

What is the magnitude of the magnetic field at each neutral point? Give a reason for your answer.

What conclusion is drawn regarding the magnetic field at a point if a compass needle at that point rests in any direction? Give reason for your answer.

Complete the following sentence :

If the field lines in a magnetic field are parallel and equidistant, the magnetic field is __________  .

In a uniform magnetic field, the field lines are:

State the laws of reflection.

Select the correct option:

The wavelength is the linear distance between the:

Select the correct option:

The number of oscillations passing through a point in unit time is called:

Select the correct option:

The SI unit of frequency is

Why do astronauts talk to each other through radio telephone in space?

Define the term wavelength.

State four differences between the sound wave and the light wave.

What is meant by the term wave motion?

A charge of 5000 C flows through an electric circuit in 2 hours and 30 minutes. Calculate the magnitude of current in a circuit.

A battery can supply a charge of 25 × 10⁴ C. If the current is drawn from battery at the rate of 2.5 A, calculate the time in which battery will discharge completely.

A dry cell can supply a charge of 800 C. If continuous current of 8.0 mA is drawn, calculate the time in which cells will discharge completely.

What do you understand by the closed electric circuit