Science Quiz Vigyan Sanjeevini

Which one of the steps while burning a candle is not reversible?

• Melting of solid wax

• liquid wax changes into vapours

• Wax vapour bums into flame

• All of these

Which of the following is a chemical change?

• Evaporation of water

• Burning of fuels

• Moving of a wheel

• Breaking of a brick

A freely suspended bar magnet rests in

• north-south directions

• east-west directions

• upside down

• any direction by chance

The magnetic properties of a magnet will not be affected by

• hammering

• heating

• dropping from height on hard surface

• boiling

Wind is

• air around us

• rising hot air

• air in motion

• none of these

Which is not a property of air?

• It occupies space.

• It has weight.

• It is a solution.

• It is a compound.

An example of a conductor is

• tap water

• salt solution

• metal wire

• all of these

Bulb glows only in

• closed circuit

• open circuit

• in both circuits

• open circuit if bulb is not fused

What is the SI unit of length?

• Metre

• Centimetre

• Kilometre

• All of these

Which is an example of a periodic motion?

• Oscillation of a pendulum

• Motion of a bus on road

• A spinning top

• A stone dropped from a certain height