Advertisements
Advertisements
प्रश्न
What is backlash error? Why is it caused? How is it avoided?
Advertisements
उत्तर
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.
APPEARS IN
संबंधित प्रश्न
Complete the following: 1 m =……….. µ
Complete the following: 1 quintal =………kg
Complete the following: 1 µs =……….s
What do you understand by the term measurement?
Define a fundamental quantity.
Complete the rollowing:
1 u = ____ kg
Match the events related to motion in Column I with the types of motions given in Column II.
| Column I | Column II | ||
| (a) | A moving wheel of a sewing machine |
(i) | Circular motion |
| (b) | Movement of tip of the minute hand of a clock in one hour |
(ii) | Rotational motion |
| (c) | A moving swing | (iii) | Periodic motion |
Define measurement.
Questions based on Higher Order Thinking Skills:
|
There are three spheres A, B, C as shown below. Sphere A and B are made of same material. Sphere C is made of a different material. Spheres A and C have equal radii. The radius of sphere B is half that of A. Density of A is double that of C.
|
Now answer the following questions:
- Find the ratio of masses of spheres A and B.
- Find the ratio of volumes of spheres A and B.
- Find the ratio of masses of spheres A and C.
