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

A crowbar of length 100 cm is used to lift a load of 5 kgf. It has its fulcrum at a distance of 20 cm from the load. Calculate:
(i) the mechanical advantage of a crowbar and,
(ii) the effort applied at the other end.

State and define Ohm’s law.

Define ampere and volt with respect to Ohm’s law.

State the limitations of Ohm’s law.

What is non-ohmic resistor?

What are ohmic conductors? Give one exmaple. Draw a graph showing the current-voltage relationship for an ohmic conductor.

What are non-ohmic conductors? Give one exmaple. Draw a current-voltage graph for a non-ohmic conductor.

Draw a neat diagram for the verification of Ohm’s law by voltmeter-ammeter method. By another diagram show the relation between p.d. and current.

An ammeter placed in series with an electric radiator reads 0.5 amps and a voltmeter placed across it reads 230 volts. What is the resistance of the radiator?

A ray of light is moving from a rarer medium to a denser medium and strikes a plane mirror placed at 90° to the direction of the ray as shown in the diagram.

(i) Copy the diagram and mark arrows to show the path of the ray of light after it is reflected from the mirror.

(ii) Name the principle you have used to mark the arrows to show the direction of the ray.

The diagram shows a current-carrying coil passing through a cardboard sheet. Draw three magnetic lines of force on the board.

State two factors on which magnitude of magnetic field at the centre depends.

Sketch the lines of force of the magnetic field of a solenoid. How does its field compare with that of a bar magnet?

The adjacent diagram shows a small magnet placed near a solenoid. State whether the magnet is attracted or repelled, as the switch is pressed. Give a reason.

What is a solenoid? Why do we usually keep its diameter small in comparison to its length?

The diagram below shows a magnet moved near a coil along its axis. Which of the diagram shows correct flow of current during this motion?

The diagram below shows an insulated copper wire wound around a hollow cardboard cylindrical tube. Answer the questions that follow:

1. What are the magnetic poles at A and B when the key K is closed?
2. State two ways to increase the strength of the magnetic field in this coil without changing the coil.
3. If we place a soft iron bar at the centre of the hollow cardboard and replace the DC source with an AC source then will it attract small iron pins toward itself when the current is flowing through the coil?

Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 ms^-1. (g = 10 ms^-2)

In the above diagram Lata stands between two cliffs and claps her hands.

Determine the time taken by her to hear the first echo. Speed of sound in air 320 ms^-1.

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

Study the table.

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

Current is flowing through a coil as shown in the figure. Which one of the given figures will correctly depict the magnetic polarity and the direction of the lines of force along the axis of the coil?