ICSE ICSE Class 6 - CISCE Question Bank Solutions

In the following diagram, draw rays to form umbra on the screen.

In the following diagram, draw rays to form a penumbra on the screen.

State the conditions when only the penumbra of an opaque object is obtained on the screen.

Why is it that the birds flying in the sky do not cast their shadow on the earth?

Tick the correct answer.

Umbra is a region of

Answer the following.

How is a shadow formed? Write the conditions required for a shadow to form.

In a machine, an effort of 10 kgf is applied to lift a load of 100 kgf. What is its mechanical advantage?

The mechanical advantage of a machine is 5. How much load it can exert for the effort of 2 kgf?

The mechanical advantage of a machine is 2. It is used to raise a load of 15 kgf. What effort is needed?

Solve the following numerical problem.

The length of a lever is 2 m. Calculate its mechanical advantage if the fulcrum is situated at a distance of 40 cm from the effort.

Solve the following numerical problem.

Calculate the mechanical advantage of a crowbar of length 240 cm if its fulcrum is situated at a distance of 40 cm from the load.

Write true or false.

Every measurement involves two things – a number and a unit.

What are the S.I. units of

1.  mass
2.  length
3.  time and
4.  temperature.

Write their names and symbols.

Match the following.

Fill in the blank.

In the ............ system, length is measured in centimetres.

Fill in the blank.

The darkest portion of a shadow is called the ................

Fill in the blank.

The less dark portion of a shadow is called the .................

Select the correct alternative.

Umbra is a region of

Select the correct alternative.

Penumbra is a region of

What is a shadow? Give a reason for its formation.