Heat — PHYSICS STD 9 — Question

How is the barometric height of a simple barometer affected if Its tube is pushed down into the trough of mercury?

Define speed of a body.

Write the numerical value of the atmospheric pressure on the surface of earth in pascal.

Is the density of a body the same as its relative density?

A body falls freely downward from a certain height. Show graphically the relation between the distance fallen and square of time. How will you determine 'g' from the graph?

If a number of forces act on a stationary body at the same point, then what do you conclude from it?

How will you minimize heat loss due to the following:
Conduction

What does a force do in the following case?
You apply brakes to a running car.

Compare the brightness of two 60 watt bulbs.
When they are connected in series.
Explain giving scientific reasons.

State three factors affecting evaporation.