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

When we want to use a machine as a force multiplier, which class of lever should we preferably use? Give a simple diagram of such a lever.

The diagram below shows a lever in use.

(i) To which class of lever does it belong?
(ii) If FA = 40 cm, AB = 60 cm, then find the mechanical advantage of the lever.

What is a lever?

The diagram shows the use of a lever.

1. State the principle of moments as applied to the above lever.
2. Which class of lever is this? Give an example of this class of lever.
3. If FA = 100 cm, AB = 90 cm, calculate the minimum effort required to lift the load.

State the types (or kinds) of lever, and give two examples of each kind.

The length of a nut-cracker is 12 cm. A nut, when kept at a distance of 4 cm from its fulcrum, requires an effort of 100 gf to crack it. What force will be required to crack the nut without using the nut-cracker?

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?