Sound — Physics STD 10 — Question

A conductor carrying current cannot produce electrostatic field because:

The most energetic electromagnetic radiations are : ________ .

Water is used in hot water bottles for fomentation, because :

A light ray remains unbent at the boundary when passing from one medium to another if the angle of incidence is:

If R is the resistance of a conductor, such that 'I' is its length and 'a' is the area of cross-section, then specific resistance of conductor is:

100 C charge means a deficit of _________ electrons.

On what factors does the mechanical advantage of the first class lever depend on?

Which statement is NOT true for an electromagnet?

According to old convention, the colour of neutral wire is:

Jibs, cranes and hoist are examples of ___________ .