Measurement and Effects of Heat — Science STD 8 — Question

Main constituent of alkali is …………….. .

Thermocol melts at ………… °C.

Cardiac muscles are …………… .

Air pollutants with ……….. cause colour change in paints, oil paintings, nylon, etc.

Rusting of iron is a slow chemical change.

Fill in the following blanks with suitable words:
________ is provided in buildings to protect us from electric shocks due to any leakage of electric current.

Fill in the following blanks with suitable words:
A set of three tiny ___________________ in the middle part of ear passes on sound vibrations from the eardrum to the liquid in cochlea.

Fill in the following blanks with suitable words:
The charging of an object by rubbing it with another object is called charging by ________.

Motor cars are coated with ……… .

The region in a sound wave, with higher pressure and density is called ………….. and that with low pressure and density is called ……….. .