Metal+ Dilute acid =

Which of the following is not an alloy

_______ is a non-metal used in vulcanisation of rubber

Sodium + Water =

During fractional distillation, crude oil is heated in a ____________

Petrol, LPG and spirit are examples of

Which plant is a perfect plant to make biodiesel

The speed sound in air is

The heaviest part obtained by fractional distillation of petroleum is

Higher the frequency , Higher the ______

Higher the amplitude, Greater the ______

Sounds of same loudness can be distinguished using

The object which loses electrons becomes ___________ charged,

While the other which gains electrons becomes ________charged.

Rubbing increases the area of contact between them and speeds up the transfer of electrons from one object to another.

This method of charging an object is called charging by

Who was scientist who discovered lightning conductors?

The image formed in a plane mirror are

The portion in the human eye where the image is focused is called as

Nearsightedness or myopia can be corrected with a