It is better to use a sharp tripped nail than a blunt nail because
The tip with the smallest area will produce a higher pressure when a small force is applied
A sharp tipped nail needs a larger force to drive it into the wooden surface
The sharp tip saves cost as less raw materials are required to make such nails
The sharp tip has a spiralling effect when the nail is hit on the head
With the increase in the weight of an object the pressure
Increases
Decreases
Is not affected
None of these
A deep sea diver may hurt his ear drum during diving because of :
Lack of oxygen
More atmospheric pressure
More water pressure
Due to salty sea water
Which of the following statement is NOT true ?
A freely falling body is acted upon by gravitational force
Pressure on top of mount everest is much more than 1 atm
S.I. unit of pressure is pascal
The blood vessels in our body maintains the internal pressure equal to the atmospheric pressure
Which of the following statements is incorrect about a force?
It can be seen but it cannot be felt.
It is needed to start an object moving.
It can change the shape of an object.
It can make a moving object stop.
The SI unit of impulse :
N s
N s2
Kg m / s2
F / s
Which of the following is NOT a type of force?
muscular
magnetic
chemical
gravitational
It is easier to swim in sea water than in river water because :
Sea water is more dense than river water
Sea water has waves
Sea has large quantity of water
Statement is false
In which of the following case a non contact force is applied :
Pulling a chair
Pushing a desk
A magnet attracting a needle
Hitting a cricket ball
A force of 10 N is acting on an object of mass 10 kg. What is the acceleration produced in it ?
1m/s2
1m/s
100 m/s2
100 m/s
