Spread his hands outwards
Smoke and fog
Smog is a combination of Smoke and fog.
Behind him
Energy
The exhaled warmer air rises up and goes out
Ventilators are provided near the ceiling of the room because the exhaled warmer air rises up and goes out.
Water expands on freezing
In severe winter, in cold countries water pipes burst because Water expands on freezing.
Low temperature, high pressure
The density of a gas is maximum at Low temperature and high pressure.
Continue to follow the motion of the satellite
The spoon dropped by an astronaut in a satellite will Continue to follow the motion of the satellite.
Reaction
A person is hurt on kicking a stone due to Reaction.
Bridge
Petrol
Petrol has the least density.
Both the stones reach the ground at the same time
when Two stones of different masses are dropped simultaneously from the top of a building, Both the stones reach the ground at the same time.
Poles
It rises a little
When a ship enters the sea from a river, It rises a little.
Ahead of his feet
The centre of gravity of a sprinter during the race lies Ahead of his feet.
Increase
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole Increase.
24 hours
The period revolution of a geostationary satellite is 24 hours.
They must be dropped in vacuum
Gravity
The atmospheric air is held to the Earth by Gravity.
2 seconds
The time period of a seconds' pendulum is 2 seconds.