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

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.

1. A beam of monochromatic light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?
2. If white light is used in the same way as in part (a) above, what change do you expect in the emergent beam?
3. What conclusion do you draw about the nature of white light in part (b)?

What conclusion do you draw about the nature of white light in part (b)?

What do you understand by the term spectrum?

A ray of white light is passed through a glass prism and a spectrum is obtained on a screen.

1. Name the seven colours of the spectrum in order.
2. Do the colours have the same width in the spectrum?
3. Which of the colour of the spectrum of white light deviates (i) the most, (ii) the least?

Complete the ray diagram given below to show the nature of light produced on the screen.

When a white light ray falls on a prism, the ray at its first surface suffers ______.

In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is ______.

The frequency range of visible light is from 3.75 × 10¹⁴ Hz to 7.5 × 10¹⁴ Hz. Calculate its wavelength range. Take speed of light = 3 × 10⁸ m/s.

Define amplitude term in relation to a wave.

Define frequency term in relation to a wave.

Define wavelength term in relation to a wave.

Define wave velocity term in relation to a wave.

A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which changes.