SCIENCE 8 PA 2(1) SESSION 2020-2021

Which of the following cannot be charged easily by friction?

A plastic scale
A copper rod
An inflated balloon
A woolen cloth

When a glass rod is rubbed with a piece of silk cloth the rod

and the cloth both acquire positive charge.
and the cloth both acquire negative charge.
becomes positively charged while the cloth has a negative charge.
becomes negatively charged while the cloth has a positive charge.

A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that

liquid B is a better conductor than liquid A.
liquid A is a better conductor than liquid B.
both liquids are equally conducting.
conducting properties of liquid cannot be compared in this manner.

Process of separation of different constituents from petroleum is called[ ................... ].
refining
refilling

The passage of an electric current through a solution causes [ ................... ] effects.
mechanical
chemical

If you pass current through copper sulphate solution, copper gets deposited on the plate connected to the [ ................... ]terminal of the battery.
negative
positive

Fossil fuels can be made in the laboratory. 

False
True

Coke is almost pure form of carbon.

False
True

Lightning conductor cannot protect a building from lightning.

False
True

Unlike charges attract each other. 

False
True