Vernier Caliper

Q.

The main scale of a vernier callipers is calibrated in mm and 19 divisions of main scale are equal in length to 20 divisions of vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and 4th division of vernier scale coincides with a main scale division. Find : (i) least count cand (ii) radius of 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