(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

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

Thickness of a pencil.

Explain the terms : Least count of a screw gauge.
How are they determined?

Explain the terms : Pitch .
How are they determined?

Draw a neat and labelled diagram of a screw gauge.

Name its main parts and state their functions.

State one use of a screw gauge.

State the purpose of ratchet in a screw gauge.

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

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

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

Name the instrument which can accurately measure the following

The internal diameter of the neck of a water bottle

Which of the following measures a small length to high accuracy : metre rule , vernier callipers or screw gauge?

Name the instrument which has the least count

 0.1 mm

The least count of a vernier calipers is :

The diameter of a thin wire can be measured by

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 the pencil?

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 the vernier scale is ahead of the zero of the main scale and the 3rd division of the vernier

scale coincides with a main scale division.

Find : (i) The least count and

         (ii) The zero error of the vernier callipers.

In the vernier callipers, there are 10 divisions on the vernier scale and 1 cm on the main scale is divided into 10 parts. While measuring the length, the zero of the vernier lies just ahead of the 1.8 cm mark and the 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 ?

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

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 a screw gauge?

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

(i) What is the pitch of the screw gauge?

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