Siddharth Mukherji Solutions for Chapter: Physics, Exercise 1: Assessment

A pure semiconductor has:

The technique of collecting information about an object from a distance without making physical contact with it is:

The sharpness of a television image is termed as its:

The audio signals of TV are:

Consider the following statements:

I. A geostationary satellite is at an approximate height of $10,000 \mathrm{km}$.

II. FM transmission of music is a very good quality, because the atmospheric or mass made noises which are generally frequency variations can do little harm.

Which of the statement(s) given above is/are correct?

Consider the following statements:

I. Thousands of minor planets lies between the orbits of mars and jupiter are known as asteroides.

II. Asteroids is an irregular, rocky hunk small both in size and in mass compared to a planet.

III. Ceres, is the largest known asteroid.

IV. Asteroids are debris left over from the accumulation process.

Which one of the statements are true?

A basic communication system consists of-

(A) Transmitter

(B) Information source

(C) User of information

(D) Channel

(E) Receiver

Choose the correct sequence in which these are arranged in a basic communication system:

Fibre optics cable used in communication, works on the principle of: