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

Fig.  represents the circuit used for the verification of Ohm's law. Label the parts from A to F. state the function of each.

A lever of length 9 cm has its load arm 5 cm long and the effort arm is 9 cm long.

1. To which class does it belong?
2. Draw a diagram of the lever showing the position of fulcrum F and directions of both the load L and effort E.
3. What is the mechanical advantage and velocity ratio if the efficiency is 100%?
4. What will be the mechanical advantage and velocity ratio if the efficiency becomes 50%?

1. Name and state the law which relates the potential difference and current in a conductor.
2. What is the necessary condition for a conductor to obey the law named above in part (a) ?

The filament of a bulb takes a current 100 mA when potential difference across it is 0.2 V. When the potential difference across it becomes 1.0 V, the current becomes 400 mA. Calculate the resistance of filament in each case and account for the difference.

Define power.

Which type of levers have mechanical advantage always more than 1? Give reasons.

Give three examples for leavers of 1st order.

Give three examples for leavers of second order.

Give three examples for leavers of the third order.

Which class of lever found in the human body is being used by a boy when he holds a load on the palm of his hand.

Which class of lever found in the human body is being used by a boy when he raises the weight of his body on his toes?

The following belong to which class of lever?

The Physical balance

The following belong to which class of lever?

A see-saw

The following belong to which class of lever?

An oar of a boat

The following belong to which class of lever?

Human-arm

The following belong to which class of lever?

Pliers Tools

The following belong to which class of lever?

A claw-hammer

The following belong to which class of lever?

Rowing of a boat

The following belong to which class of lever?

A fire tongs