ICSE ICSE Class 6 - CISCE Question Bank Solutions for Physics

Answer the following.

What do you understand by a complex machine?

Tick the most appropriate answer.

The region around a magnet where its magnetic force can be experienced is called

State if the following statement is true or false. Correct the statement if it is false.

There are four types of simple machines.

State if the following statement is true or false. Correct the statement if it is false.

Work done by a machine is always more than the work done on a machine.

Answer the following in short.

Mention any two methods by which we can take care of machines.

Give a reason for the following.

Machines are able to make our work convenient.

Fill in the blank.

Like poles ..................... each other.

Fill in the blank:

The mechanical advantage of class .............. lever is always less than 1.

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.

Draw a ray diagram to show the formation of the shadow of an opaque object by a point source of light. How is the size of shadow affected if the screen is moved away from the object?

State two differences between an umbra and a penumbra.

Draw a ray diagram to show the formation of umbra alone.

Draw a ray diagram to show the formation of umbra and penumbra both. Label the parts umbra and penumbra in your diagram.

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.