SSLC (English Medium) कक्षा ८ - Tamil Nadu Board of Secondary Education Question Bank Solutions

Assertion: Convex mirrors are used as a rearview mirror in vehicles for observing traffic at our back.
Reason: A convex mirror has a much larger field of view.

A convex rearview mirror is preferred over a plane mirror in a car. Why?

The method of charging an object by touching is called ______.

The material which does not allow electric current is called  ______.

All metals are ______.

Comb rubbed with hair ______ electrons from the hair and becomes negatively charged.

When an ebonite rod is rubbed with fur, the fur transfers ______ to the ebonite rod.

Materials that do not allow electric charges to pass through them easily are called insulators.

Silk cloth has an excess electron, so it becomes positively charged.

Materials that do not allow the current to pass through them are called insulators.

What will be the charges on silk and glass rods when they are rubbed against each other?

When a negatively charged glass rod is brought near another glass rod, the rod will move apart. Give reason.

When an ebonite rod is rubbed with fur, the fur transfers electrons to the ebonite rod. Why?

List the ways in which you can charge an object.

Name a few paramagnetic substances.

Liquid hydrogen, hydrazine, and ______ are liquid fuels.

The propellants may be in the form of a liquid or gas.

Liquid hydrogen, hydrazine, and ethyl alcohol are liquid fuels.

Combustion of solid propellants can be stopped once it is ignited.

Name the solid fuels used in rockets.