Vernier Caliper

Q.

The main scale of vernier calipers is calibrated in mm and 19 divisions of the main scale are equal in length to 20 divisions of the vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and the 4th division of the vernier scale coincides with the main scale division. Find :

(i) least count

(ii) radius of the cylinder.

Q.

In a vernier callipers, there are 10 divisions on the vernier scale and 1 cm on the main scale is divided in 10 parts. While measuring a length, the zero of the vernier lies just ahead of 1.8 cm mark and 4th division of vernier coincides with a main scale division.

(a) Find the length.

(b) If zero error of vernier callipers is - 0.02 cm, what is the correct length ?

Q.

A vernier has 10 divisions and they are equal to 9 divisions of the main scale in length. If the main scale is calibrated in mm, what is its least count?

Q.

What is meant by zero error of a vernier callipers ? How is it determined ? Draw neat diagrams to explain it. How is it taken in account to get the correct measurement ?

Q.

A vernier callipers has its main scale graduated in mm and 10 divisions on its vernier scale are equal in length to 9 mm. When the two jaws are in contact, the zero of vernier scale is ahead of zero of main scale and 3rd division of vernier scale coincides with a main scale division. Find : (i) the least count and (ii) the zero error of the vernier callipers.

Q.

Define the term 'Vernier constant'.

Q.

While measuring the length of a rod with a vernier callipers, Fig. 1.14 below shows the position of its scales. What is the length of the rod ?

Q.

What is the least count of the traveling microscope?

Q. A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.4 mm. If the zero error of vernier callipers is +0.02 cm, what is the correct thickness of pencil?

1. 1.42 mm
2. 1.2 mm
3. 1.6 mm
4. 1.38 mm

Q.

Draw a neat labelled diagram of a vernier callipers. Name its main parts and state their functions.

Q.

A microsocpe is provided with a main scale graduated with 20 divisions in 1 cm and a vernier scale with 50 divisions of main scale. Find the least count of the microscope.

Q.

When is a vernier callipers said to be free from zero error ?

Q.

A vernier caliper is used for measuring lengths to an accuracy of:

Q.

State three uses of a vernier callipers.

Q.

What is the least count of a meter rule?

Q.

Name the part of the vernier callipers which is used to measure the following :

(a) external diameter of a tube,

(b) internal diameter of a mug,

(c) depth of a small bottle,

(d) thickness of a pencil.

Q. Which part of vernier callipers is primarily used to measure the internal diameter of a hollow cylinder or pipe?

1. Vernier scale
2. Main scale
3. Inside jaws
4. Strip

Q.

Name the two scales of a vernier callipers and explain, how is it used to measure a length correct up to 0.01 cm.

Q.

Convert $\text{1}$ Minute to milliseconds

Q. While measuring the length of a small rod using a vernier callipers, the difference between the observed length and the true length turned out to be $0.4mm$. When the jaws are made to touch each other, the 3rd division on the vernier scale coincides with a division on the main scale, then the least count of the callipers is:

1. $0.00133cm$
2. $0.133cm$
3. $1.33cm$
4. $0.0133cm$

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 $mm$.

1. 36.063

Q.

Describe in steps, how would you use a vernier callipers to measure the length of a small rod ?

Q.

Vernier caliper is used to measure ___.

1. King's feet

2. Hand's span

3. None of these

4. oranges

Q.

Define least count of a vernier callipers. How do you determine it ?

Q.

a scale is calibrated into divisions of 0.5mm each . If 20divisions of this scale divided into 25 equal parts of a vernier , calculate the least count .

Q.

A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is :

(a) 0.002 cm (b) 0.001 cm

(c) 0.02 cm (d) 0.01 cm

Q. The main scale of a vernier callipers reads 10 mm in 10 divisions of Vernier scale coincide with 9 divisions of the main scale. When a cylinder is tightly placed between the two jaws, the zero of vernier scale lies slightly behind 3.2 cm and the fourth vernier division coincides with a main scale division. The diameter of the cylinder is :

1. 3.09 cm
2. 3.14 cm
3. 3.04 cm
4. 3.03 cm

Q.

When the barometer tube is tilted, the vertical height of mercury in it does not change.

1. True
2. False

Q.

How is the barometric height of a simple barometer affected if its tube is slightly tilted from vertical?

Q. The main scale reading of a vernier calliper is obtained as 3.2 cm for an object placed in it. If the 4th division of the vernier scale coincides with a division on the main scale, and the magnitude of the positive zero error is 0.03 cm, what is the true length of the object in cm? Take L.C. = 0.01 cm.

1. 3.21