Explain why :
Aluminium is used for making cables for overhead electric transmission.

Explain why : Aluminium is used for making cooking vessels.

Aluminium is not used to make :

Aluminium is used for making alloys because of its

Explain why: Helium is used for filling weather balloons.

Why is platinum used for making resistance thermometer?

A: PMMA is used for making lenser and light cover. R:It has excellent light transmission properties.

Silver is used to make electric cables.

Explain the following : (a) Why is tungsten used almost exclusively for filament of incandescent lamp ? (b) Why are the conductors of electric heating devices, such as toaster and electric irons, made of an alloy rather than a pure metal ? ( c) Why is the series arrangement not used for domestic circuits ? (d) How does the resistance of a wire vary with its cross-sectional area ? (e ) Why are copper and aluminium wires usually employed for electricity transmission.

Give reason for the following: (i) Electric bulbs are usually filled with chemically inactive gases like nitrogen and argon. (ii) Copper and aluminium wires are usually employed for electricity transmission. (iii) Fuse wire is placed in series with the device.

Explain the Why are flat and long skies used for gliding over snow?