Question
What is backlash error? Why is it caused? How is it avoided?
✓
Answer
Backlash error: If by reversing the direction of rotation of the thimble, the tip of the screw does not start moving in the opposite direction immediately but remains stationary for a part of rotation; it is called backlash error.
Reason: It happens due to wear and tear of the screw threads.
To avoid the backlash error, while taking the measurements the screw should be rotated in one direction only. If the direction of rotation of the screw needs to be changed, then it should be stopped for a while and then rotated in the reverse direction.
Reason: It happens due to wear and tear of the screw threads.
To avoid the backlash error, while taking the measurements the screw should be rotated in one direction only. If the direction of rotation of the screw needs to be changed, then it should be stopped for a while and then rotated in the reverse direction.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A car is moving with a uniform velocity $30 ms^{-1}$. It is stopped in 2 s by applying a force of 1500 N through its brakes. Calculate the following values : The change in momentum of car.
→Draw distance-time graph to show:
Uniform velocity
Uniform velocity
1. Name the metal used for E and F.
2. Why are E and F placed in contact with the poles of the magnets as shown in the diagram?
3. Mark on the diagram the poles of the second magnet,
4. What is the material of darkened part?
2. Why are E and F placed in contact with the poles of the magnets as shown in the diagram?
3. Mark on the diagram the poles of the second magnet,
4. What is the material of darkened part?
State the advantages and disadvantages of mercury and alcohol as thermometric liquids.
How long will sound take to travel in (a) and iron rail and (b) air, both 3.3 km in length? Take speed of sound in air to be 330 m/s and in iron to be 5280 m/s.
A solid weighs 2.10 N in air. It has a relative density of 8.4. How much will the body weigh if placed: In a liquid of relative density 1.2
(a) A body whose volume is 100 cm weighs 1 kgf in air. Find its weight in water.
(b) Why is it easier to swim in sea water than in river water?
(b) Why is it easier to swim in sea water than in river water?
A ball is thrown vertically upwards. It goes to a height 20 m and then returns to the ground. Taking acceleration due to gravity g to be $10 ms^{-2}$ , find :
the final velocity of the ball on reaching the ground .
→the final velocity of the ball on reaching the ground .
Draw a ray diagram to show the formation of image by a concave mirror for an object placed between its pole and focus. State three characteristics of the image.
Show by an experiment that the real expansion of a liquid is equal to the sum of its apparent expansion of a liquid is equal to the sum of its apparent expansion and the volume expansion of the vessel containing the liquid.