With the help of a neat-labelled diagram, explain the construction and working of an electric bell.

(a) With the help of a labelled diagram, explain the construction and working of a solar cooker. (b) Why is the solar cooker box painted black from inside ? (c ) Why is the solar cooker box covered with a glass sheet ?

Draw a neat and labelled diagram of the human ear. With the help of this diagram, explain the construction and working of the human ear.

With a neat labelled diagram, explain the construction and working of a compound microscope.

With the help of a labelled diagram, explain the working of hydraulic brakes.

State Pascal’s law for fluids with the help of a neat labelled diagram explain the principle and working of hydraulic brakes.

With the help of a neat diagram, describe the construction and working of Van de Graff genertor.

With the help of labelled diagram explain the structure of human respiratory system.

With the help of labelled diagram, explain the following : (a) Diplotene

State the principle on which the working of an electric motor is based. With a neat and well labelled diagram, explain the construction of an electric motor.