High School   Science


A cork is floating in water. What is the apparent weight of the cork? (2)
A helium filled balloon rises to a certain height and then halts. Why? (2)
What are centre of buoyancy andmetacentre? (2)
State the laws of flotation (2)
Does a ship sink more in river water or in sea water? Explain (2)
Why is the bottom of a ship made heavy? (2)
Why does ice float in water? (2)
The earth moving round the sun in an orbit is acted upon by a force; hence the work must be done on the earth by this force (2)
How does K.E. of an object change if its momentum is doubled? (2)
Distinguish between conservative and non-conservative force (2)
Differentiate between conservation of kinetic energy and conservation of linear momentum (2)
What is meant by elastic and inelastic collision? (2)
In a siphon, water is lifted above its original level during its flow from one container to another, where does it get the needed potential energy from? (2)
Why is it easy to pull a lawn roller than to push it? (2)
When a large heavy truck collides with a passenger car, the occupants of the car are more likely to be hurt than the truck driver. Why? (2)
Coin over cardboard, under glass falls in glass when cardboard is pulled (2)
Why is the kinetic friction less than the limiting friction? (2)
Explain how Newton’s first law of motion follows from the second law (2)
Can a body be regarded in a state of rest as well as in motion at the same time? Give an example (2)
Is friction a necessary evil? Explain (2)
Moving bullet strike and KE (2)
Why do leaves fall when a tree i shaken? (2)
Explain why a cricketer moves his hands backwards while catching ball? (2)
If action and reaction are always equal and opposite, why don’t they always cancel each other? (2)