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

1. State the relationship between mechanical advantage, velocity ratio and efficiency.
2. Name the term that will not change for a machine of a given design.

How is the mechanical advantage related with the velocity ratio for an actual machine? State whether the efficiency of such a machine is equal to 1, less than 1 or more than 1.

Draw diagrams to illustrate the position of fulcrum load and effort, in the following:

A seesaw

Draw a diagram to illustrate the position of fulcrum load and effort, in the following:

A common balance

Draw a diagram to illustrate the position of fulcrum load and effort, in the following:

A nut cracker

Draw a diagram to illustrate the position of fulcrum load and effort, in the following:

Forceps

Figure below shows a wheel barrow of mass 15 kgf carrying a load of 30 kgf with its centre of gravity at A. The points B and C are the centre of wheel and tip of the handle such that the horizontal distance AB = 20 cm and AC = 40 cm.

Find:

1. the load arm,
2. the effort arm,
3. the mechanical advantage and
4. the minimum effort required to keep the leg just off the ground.

A fire tongs has arms 20 cm long. It is used to lift a coal of weight 1.5 kgf by applying an effort at a distance 15 cm from the fulcrum. Find:

1. the mechanical advantage of fire tongs and
2. the effort needed.

Classify the following amongst contact and non-contact forces.
normal reaction force,

Classify the following amongst contact and non-contact forces.
Frictional force

Classify the following amongst contact and non-contact forces.
gravitation force

Classify the following amongst contact and non-contact forces.
electrostatic force

Classify the following amongst contact and non-contact forces.
magnetic force

State the function of the following in a house circuiting kWh meter.

In what unit does the electric meter in a house measure the electrical energy consumed? What is its value in S.I unit?

Where is the main fuse in a house circuit connected?

How should the several electric lamps be connected with the mains so that the switching on or off a lamp has no effect on the operation of other lamps?

Two sets A and B of four bulbs each are glowing in two separate rooms. When one of the bulbs in set A is fused, the other three bulbs also cease to glow. But in set B, when one bulb fuses, the other bulbs continue to glow. Explain the difference in the two sets.

The electric meter in a house records the consumption of ______.

Draw a diagram showing the directions of three magnetic field lines due to a straight wire carrying current. Also show the direction of current in the wire.