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

In the transmission of power the voltage of power generated at the generating stations is stepped up from 11kV to 132 kV before it is transmitted. Why?

Name the subjective property of light related to its wavelength.

Name the device used to increase the voltage at a generating station.

The smoke from a fire looks white. Which of the following statements is true?

1) Molecules of the smoke are bigger than the wavelength of light

2) Molecules of the smoke are smaller than the wavelength of light.

State the condition when a force produces translational motion.

State the condition when a force produces rotational motion in a body.

When does a body rotate? State one way to change the direction of rotation of a body. Given a suitable example to explain your answer.

Draw a neat labelled diagram to show the direction of two forces acting on a body to produce rotation in it. Also, mark the point about which rotation takes place by the letter O.

A body is acted upon by two unequal forces in opposite directions, but not in the same line. The effect is that ______.

Which colour of white light is deviated by a glass prism

1. the most and
2. the least?

How does the speed of light in glass change on increasing the wavelength of light?

What is the range of wavelength of the spectrum of white light in Å?

Calculate the frequency of yellow light of wavelength 550 nm. The speed of light is 3 × 10⁸ m/s^-1.

State the S.I. unit of current.

Define the term resistivity. 

At what voltage and frequency is the electric power generated at the power generating station?

Explain with the aid of a simple diagram, the transmission of electric power from the generating station to your house.

At what voltage is the electric power from the generating station transmitted? Give reason to your answer.

At what voltage is the a.c. supplied to our houses?

Name the device used to decrease the voltage at the substation for its supply.