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

A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.

1) Calculate the speed with which this sound travels

2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?

Calculate the quantity of heat produced in a 20 Ω resistor carrying 2.5 A current in 5 minutes.

A battery of emf 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively joined in series.

Find:

1) Current in the circuit

2) The terminal voltage of the cell

3) The potential difference across 6Ω Resistor

4) Electrical energy spent per minute in the 4Ω resistor.

Name the characteristic of sound in relation to its waveform

Displacement distance graph of two sound waves A and B, travelling in a medium, are as shown in the diagram below.

Study the two sound waves and compare their:

1) Amplitudes

2) Wavelengths

You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is more than 7Ω?

1) Draw a diagram for the arrangement

2) Calculate the equivalent resistance.

State whether the resistivity of a wire changes with the change in the thickness of the wire.

 Define the unit of resistance (or Define the unit "ohm").

Write S.I. unit of moment of couple.

What do you understand by the term couple?

Prove that

Moment of couple = Force × couple arm.

What do you understand by an ideal machine? 

How does ideal machine differ from a practical machine ?

How is mechanical advantage related to the velocity ratio for an ideal machine?

State one reason why is mechanical advantage less than the velocity ratio for an actual machine.

Shows a uniform metre scale of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark.

1. State with reason whether the weight W of the scale is greater than, less than or equal to the effort E.
2. Find the mechanical advantage in an ideal case.

Define the term dispersion of light.

Explain the cause of dispersion of white light through a prism.

Explain briefly, with the help of a neat labelled diagram, how white light gets dispersed by a prism. On which surface of a prism, there is both dispersion and deviation of light, and on which surface of the prism, there is only deviation of light ?

The diagram below shows the path taken by a narrow beam of yellow monochromatic light passing through an equiangular glass prism. If the yellow light is replaced by a narrow beam of white light incident at the same angle, draw another diagram to show the passage of white light through the prism and label it to show the effect of prism on the white light.