Screw Gauge

Q.

What is Least Count of Screw Gauge?

Q.

The pitch of the screw gauge is $1mm$ and there are $100$ divisions on the circular scale. When nothing is put in between the jaws, the zero of the circular scale lines $8$ divisions below the reference line. When a wire is placed between the jaws, the first linear scale division is clearly visible while the ${72}^{nd}$ division on the circular scale coincides with the reference line. The radius of the wire is

1. $1.64mm$

2. $1.80mm$

3. $0.82mm$

4. $0.90mm$

Q.

Draw a neat and labelled diagram of a screw gauge. Name its main parts and state their functions.

Q.

When a screw gauge of least count 0.01 mm is used to measure the diameter of a wire, the reading on the sleeve is found to be 1 mm and the reading on the thimble is found to be 27 divisions. (i) What is the diameter of the wire in cm ? (ii) If the zero error is + 0.005 cm, what is the correct diameter ?

Q. Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on the circular scale is 50. Further, it is found that the screw gauge has a zero error of -0.03 mm while measuring the diameter of a thin wire, a student notes the main scale reading of 3 mm and the number of circular scale divisions in line with the main scale as 35. The diameter of the wire is:

1. 3.32 mm
2. 3.73 mm
3. 3.67 mm
4. 3.38 mm

Q.

A screw gauge has 50 divisions on its circular scale and its screw moves by 1 mm on turning it by two rotations. When the flat end of the screw is in contact with the stud, the zero of circular scale lies below the base line and 4th division of circular scale is in line with the base line. Find : (i) the pitch, (ii) the least count and (iii) the zero error, of the screw gauge.

Q.

What do you mean by zero error of a screw gauge ? How is it accounted for ?

Q.

The pitch of a screw gauge is 1 mm and its circular scale has 100 divisions. In measurement of the diameter of a wire, the main scale reads 2 mm and 45th mark on circular scale coincides with the base line. Find :

(i) the least count, and

(ii) the diameter of the wire.

Q.

Explain the terms (i) pitch, and (ii) least count of a screw gauge. How are they determined ?

Q.

The pitch of a scrw gauge is 0.5 mm and the head scale is divided in 100 parts. What is the least count of screw gauge ?

Q. thickness of a pencil measured by usinga screw guage (least count.0.001cm) comes out to be 0.802cm. the % error in the measurement is?

Q.

The least count of a screw gauge can be decreased by:

1. Increasing the pitch of the screw gauge

2. Decreasing the pitch of the screw gauge.

3. Increasing the total number of divisions on its circular scale.

4. Decreasing the total number of divisions on its circular scale.

Q.

State one use of a screw gauge.

Q.

Why do we use zero correction?

Q.

The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned through two revolutions. What is the pitch of screw gauge?

1. 0.05 mm

2. 0.5 mm

3. 5 mm

4. 0.5 cm

Q.

What is the full form of SDPO

Q.

State the purpose of ratchet in a screw gauge.

Q.

A screw has a pitch equal to 0.5 mm. What should be the number of divisions on its head so as to read correct up to 0.001 mm with its help ?

Q. The least count of a screw gauge can be decreased by

1. constructing the gauge with a mixture of iron and lead
2. increasing the total number of divisions on the circular scale
3. decreasing the total number of divisions on the circular scale
4. breaking the screw gauge into two

Q.

The thimble of a screw gauge has 50 divisions. The spindle advances 1 mm when the screw is turned two revolutions.

(i) What is the pitch of screw gauge ?

(ii) What is the least count of the screw gauge ?

Q.

Describe the procedure to measure the diameter of a wire with the help of a screw gauge.

Q.

A screw gauge has a least count 0.001 cm and zero error + 0.007 cm. Draw a neat diagram to represent it.

Q. How to find error in screw gauge

Q. A micrometre screw gauge has a negative zero error of $0.0018cm$. The main scale reading is $3.6cm$ for an object. The baseline coincides with the ${45}^{th}$ division of the circular scale. Calculate the true length of the object in $cm$.

1. $7.2126cm$
2. $0.7212cm$
3. $3.6063cm$
4. $36.063cm$

Q.

The pitch of a screw gauge is 0.5 mm and the head scale is divided in 100 parts. What is the least count of screw gauge?

1. 0.005 cm

2. 0.005 mm

3. 0.0005 mm

4. 0.05 mm

Q.

Which of the below-given instruments has 0.01 mm as its least count?

1. Screw gauge

2. Vernier Caliper

3. Thermometer

4. None of the above

Q. What is the pitch of a screw gauge?

1. Translation distance covered in one rotation of screw.
   
2. Angular distance covered in one rotation of screw.
3. Angular distance covered in half a rotation of screw.
4. None of the above.
   

Q.

Name the instrument which can measure accurately the following :

(a) the diameter of a needle,

(b) the thickness of a paper,

(c) the internal diameter of the neck of a water bottle,

(d) the diameter of a pencil.

Q.

Calculate the mechanical advantage of a screw whose radius is 9mm and pitch of 3mm.

1. 3.14

2. 18.8

3. 9.00

4. 15.6

Q. Which part of a screw gauge is used to mark the circular scale?

1. Sleeve
2. Thimble
3. Main scale
4. Circular scale