Friction

Which of the following is not a smooth surface?
1. Surface of a mirror
2. Surface of wet soaps
3. Glazed tiles
4. Surface of tyres
Which of the following is not a rough surface?
1. Soles of shoes
2. Surface of ply wood
3. Surface of an oily pot
4. Surface of a brick
Which of the following examples support the statement 'Friction is a must'?
1. Friction is responsible for the wear down of machinery.
2. Friction is responsible for motion of any object.
3. Friction is responsible for overheating of a car engine.
4. None of these
Which of the following examples support the statement 'Friction is a foe'?
1. Writing on a chalkboard is possible because of friction.
2. Walking is possible because of friction.
3. Wearing down on machinery is because of friction.
4. All of these
Which of the following is not an effect of friction?
1. Heat
2. Wear and tear
3. Ability to hold
4. Decreasing resistance
Which of the following is least in magnitude?
1. Sliding
2. Static
3. Rolling
4. Drag
Which of the following is the greatest in magnitude?
1. Static
2. Rolling
3. Sliding
4. Drag
Which of the following does not reduce friction?
1. Applying greese
2. Oiling of object
3. Painting of object
4. Making an object rougher
Which of the following will have the most fluid friction?
1. Water
2. Oil
3. Honey
4. Air
Which of the following will have the least fluid friction?
1. Water
2. Oil
3. Honey
4. Juice
Force acting between two surfaces is called
1. Friction
2. Mechanical force
3. Power
4. Pressure
Friction due to fluid is called
1. Fluid friction
2. Drag
3. Fluid friction and drag
4. None of these
Which is not an example of a streamlined object?
1. Aeroplane
2. Ship
3. Motor rail
4. Bird
Which of the following statements is true?
1. Friction depends on the area of contact of two surfaces.
2. Ball bearings increase friction.
3. Another name of fluid friction is drag.
4. Graphite is a lubricant.
Which of the following statements is true?
1. Friction can be reduced by making a surface rough.
2. Ball bearings reduces friction.
3. Friction does not produce heat.
4. Static friction is the minimum of all frictions.
Which of the following statements is false?
1. Ships are given a streamlined shape to reduce friction.
2. Greese is a lubricant.
3. Spikes on a shoes increases friction.
4. It is difficult to push a moving object rather than to make it move from rest.
What would be possible if friction was absent?
1. Walking without slipping on different surfaces
2. Writing in a notebook
3. Holding objects
4. Noise will be reduced in machines
In which direction will friction act if a body moves down a slope?
1. Down the slope
2. Up the slope
3. Vertically downward
4. Vertically upward
Friction depends on
1. Nature of surface
2. Nature of material
3. Volume
4. Atmospheric pressure
The flying machine offering the least friction should be
1. Irregular
2. Free like
3. Symmetrical with many arms
4. Streamlined

Friction

Quiz