ICSE ICSE Class 7 - CISCE Question Bank Solutions

Explain the following terms:

Incident ray, Reflected ray, Angle of incidence, Angle of reflection, Normal.

A ray of light falls normally on a plane mirror. What is the angle of incidence ?

In the following diagrams, measure and write the angle of incidence and draw the reflected ray in a given case.

In the following diagrams, measure and write the angle of incidence and draw the reflected ray in each case.

In the following diagram, measure and write the angle of incidence and draw the reflected ray.

The following diagram shows an incident ray AO and the normal ON on a plane mirror. Find the angle of incidence and angle of reflection.

State in words, how do you find the location of image of an object formed by a plane mirror.

Draw a ray diagram showing the formation of image of a point object by a plane mirror.

Draw a diagram showing the reflection of a light ray from a plane mirror. Label on it the incident ray, the reflected ray, the normal, the angle of incidence i and the angle of reflection r.

State the two laws of reflection of light.

Describe an experiment to verify the laws of reflection of light. Ans. Laws of reflection.

The area of an irregular lamina is measured by using a ______.

Describe the method in steps to find the area of an irregular lamina using a graph paper.

Find the approximate area of an irregular lamina of which boundary line is drawn on the graph paper shown in following figure.

Write true or false for a given statement.

Heat flows from a body at a high temperature to a body at a low temperature when they are kept in contact. 

Write true or false for a given statement.

All solids expand by the same amount when heated to the same rise in temperature.

Write true or false for a given statement.

Telephone wires are kept tight between the two poles in summer.

Write true or false for a given statement.

Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.

Write true or false for a given statement.

Solids expand the least and gases expand the most on being heated.

Write true or false for a given statement.

A mercury thermometer makes use of the property of the expansion of liquids on heating.