Practice MCQ Questions and answers on Physics-GK

Proton carry a positive charge.

Betatron is preferred for accelerating electrons.

For an atom to emit X-rays it should have difference in energy levels.

Neurons (also called neurones or nerve cells) are the fundamental units of the brain and nervous system, the cells responsible for receiving sensory input from the external world, for sending motor commands to our muscles, and for transforming and relaying the electrical signals at every step in between.

Radio waves are used to carry satellite signals. These waves travel at 300,000 km/s (the speed of light).

In addition to transmitting frames directed to a single address, local area networks are capable of sending frames directed to a group of address, called a multicast address, which can be received by a group of stations.They can also send frames directed to all stations using the broadcast address. A frame sent to multicast destination address can be received by all stations configured to listen for that multicast address.

the full form of ''AM' regarding radio broadcasting is Amplitude Modulation.

This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.

Bandwidth is measured as the amount of data that can be transferred from one point to another within a network in a specific amount of time. Typically, bandwidth is expressed as a bitrate and measured in bits per second (bps).

Negative feedback in amplifiers increases bandwidth and decreases noise.