In football, a goal keeper stops a ball. This is due to:
Friction between the ball and hand of goal keeper
Application of force by goal keeper
Decrease in speed of ball due to air resistance
All of the above
Atmospheric pressure at sea level is equal to :
100 Pa
100 k Pa
1000 Pa
1000 k Pa
A box was pushed over an equal distance on four different surfaces.The force needed for each surface was recorded in the table below.
Surface P Q R S
Force needed (g) 550 475 500 450
On which surface was the friction least?
P
Q
R
S
Which of the following statements is correct about gravity?
The larger the mass, the greater is gravity.
Gravity is commonly called weight.
It makes the moon go around the earth.
The larger the weight of an object, greater is the gravity.
At higher altitude some people suffer from nose bleeding. Why ?
Atmospheric pressure > Pressure of air with in their body
Atmospheric pressure < Pressure of air with intheir body
Atmospheric pressure = Pressure of air with in their body
Atmospheric pressure is constant
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
Select the odd one out ?
bar
Pascal
Newton
mm Hg
The rear wheel of trucks are provided with double wheels. This is done to
Increase the force
Reduce the pressure
Increase the pressure
Decrease the force
Four forces are acting on a body. If the body doesn’t change its position or shape, the forces:
Must be of equal magnitude
Must be parallel & opposite
Must add up to zero when taken as vectors
Must be in a single line
An athlete can take a longer jump if he comes running from a distance as compared to that when he jumps suddenly. Identify the type of inertia :
Inertia of rest
Inertia of motion
Inertia of direction
Inertia of position
