(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

What device other than a plane mirror can be used to turn a ray of light through 180°? Draw a diagram in support of your answer. Name an instrument in which this device is used.

Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism. 

In the given figure, a ray of light PQ is incident normally on the face AB of an equilateral glass prism. Complete the ray diagram showing its emergence into air after passing through the prism. Take critical angle for glass = 42°.

1. Write the angles of incidence at the faces AB and AC of the prism.
2. Name the phenomenon which the ray of light suffers at the face AB, AC and BC of the prism.  

Draw a neat labelled ray diagram to show the total internal reflection of a ray of light normally incident on one face of a 30°, 90°, 60° prism.

A total reflecting equilateral prism can be used to deviate a ray of light through ______.

A total reflecting right angled isosceles prism can be used to deviate a ray of light through ______.

Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.

Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.

Name the S.I. unit of electrical energy. How is it related to Wh?

Name the S.I. unit of electrical energy. How is it related to Wh?

What is consumed while using different electrical appliances, for which electricity bills are paid? 

What is consumed while using different electrical appliances, for which electricity bills are paid? 

How do kilowatt and kilowatt-hour differ?

How do kilowatt and kilowatt-hour differ?

List the names of three electrical gadgets used in your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence find the electrical energy consumed by each in a month of 30 days.

List the names of three electrical gadgets used in your house. Write their power, voltage rating and approximate time for which each one is used in a day. Hence find the electrical energy consumed by each in a month of 30 days.

When a current I flows through a resistance R for time t, the electrical energy spent is given by ______.

When a current I flows through a resistance R for time t, the electrical energy spent is given by ______.

An electric toaster draws current 8 A in a circuit with source of voltage 220 V. It is used for 2 h. Find the cost of operating the toaster if the cost of electrical energy is ₹ 4.50 per kWh.