plz tell me how to construct full wave rectifier for the project

Use the circuit given in the study material 

Material required

(1) Two diodes

(2) PCB  (Printed circuit board)

(3) Resistor

(4) Transformer

(5) Connecting wires

(6) Soldering material

(7) Switch 

(8) Battery etc

Connect the circuit as shown figure.

Try it.