Wheels and ball bearings are used to :
Decrease friction
Decrease force
Increase force
Increase friction
Barometer is used to measure :
Force
Velocity
Pressure
Mass
Which of the following is not a non-contact force?
Frictional force
Gravitational force
Electrostatic force
Magnetic force
A liquid column having density 1000 kg/m3 exerts a pressure of 1840 Pa. What will be the height of the column? ( g = 10 m/s2 )
0.184 cm
1.84 cm
0.0184 cm
18.4 cm
Which of the following statement is true?
Pressure of a liquid depends on gravitational force
Pressure of a liquid depends on density
Pressure of a liquid directly proportional to height
All of these
What would be the pressure exerted by a liquid column of height 15 cm on its bottom? g = 10 m/s2, d = 800 kg/m3?
1000 Pa
1200 Pascal
12 pascal
10 Pa
Choose the correct one from the following.
Friction is less when the surface is hard.
Friction increases with increase in mass.
Friction with increase in mass.
The force acting on a unit area is called :
Thrust
Tension
Normal
'Friction can never be entirely eliminated'. This statement is :
False
True
Sometimes true
Sometimes false
When we hit a cricket ball with a cricket bat ,what will happen ?
Its directions of motion changes and speed remains same
Its direction of motion and speed changes
Its direction of motion donot change
Its speed remains the same
