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

State the factor that determine the pitch of a note.

Name the characteristic of the sound affected due to a change in its frequency.

Two sounds A and B are of same amplitude, same wave forms but of frequencies f and 2f respectively. Then ______.

A bulb is connected to a battery of p.d 4 V and internal resistance 2.5 Ω. A steady current of 0.5 A flows through the circuit. Calculate:

1. the total energy supplied by the battery in 10 minutes
2. the resistance of the bulb and
3. the energy dissipated in the bulb in 10 minutes.

A bulb is connected to a battery of p.d 4 V and internal resistance 2.5 Ω. A steady current of 0.5 A flows through the circuit. Calculate:

1. the total energy supplied by the battery in 10 minutes
2. the resistance of the bulb and
3. the energy dissipated in the bulb in 10 minutes.

What is a total reflecting prism?

Show with the help of a diagram how a total reflecting prism can be used to turn a ray of light through 90°. Name one instrument in which such a prism is used. 

In the following figure, a ray of light PQ is incident normally on the hypotenuse of an isosceles right angle prism ABC.

1. Complete the path of the ray PQ till it emerges from the prism. Mark in the diagram the angle wherever necessary.
2. What is the angle of deviation of the ray PQ?
3. Name a device in which this action is used. 

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?