Physics - Study Mode

[#1111] What is a neuron ?
Correct Answer

(D) Basic unit of nervous system

Explanation

Solution: 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.

[#1112] Which electromagnetic radiation is used for satellite communication ?
Correct Answer

(C) Radiowave

Explanation

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

[#1113] Sending a frame to a group of stations is known as
Correct Answer

(C) Multicasting

Explanation

Solution: 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.

[#1114] What is the full form of ''AM' regarding radio broadcasting?
Correct Answer

(D) Amplitude Modulation

Explanation

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

[#1115] Radio waves sent out by a radio stations are reflected by
Correct Answer

(D) Ionosphere

Explanation

Solution: 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.