India: Science ...

Consider the following statements:
1. In cordless telephones, the higher frequency between the wireless handset and the base station bring more clarity of voice.
2. At the higher frequency region, the cordless phone gets interference from the microwave oven and Bluetooth.
Which of the statements given above is/are correct?

Consider the following statements:
1. Microwaves are a non-ionizing electromagnetic radiation.
2. Microwaves like X-rays are extremely carcinogenic and produce several health hazards.
Which of the statements given above is/are correct?

A Metropolitan Area Network (MAN) usually interconnects a number of Local Area Networks (LANs) using a high capacity backbone technology. Which one of the following links can be used to interconnect the LANs in the MAN?

Consider the following statements:
1. K-band is the portion of the radio waves of electromagnetic spectra.
2. K-band is easily absorbed by the water vapour.
Which of the statements given above is/are correct?

Consider the following frequency bands of the microwave region.
1. C-band  2. X-band 3. Ku-band 4. Ka-band
Which of the bands given above is/are used in the satellite communication systems?

Unlike MASER, the LASER amplifies the light energy by stimulating the photons. Then, which parts of the electromagnetic spectra are amplified in the MASER?

Consider the following statements:
1. Asymmetric digital subscriber line enables faster data transmission over copper telephone lines than the conventional voice band modem.
2. Asymmetric digital subscriber line uses the same frequencies that are used by a voice telephone call.
Which of the statements given above is/are correct?

Very High bit-rate Digital Subscriber Line (VHDSL) is a DSL technology providing faster data transmission over a single flat untwisted or twisted pair of copper wires.
Which one of the following services is supported by the Advanced VHDSL technology?

Who had invented the mechanical television which is the pioneer of modern television?

Consider the following statements:
1. Wavelength Division Multiple Access is a variant of the Frequency Division Multiple Access.
2. In Wavelength Division Multiple Access, the different data streams are transmitted using the different colours in fibre-optical communication systems.
Which of the statements given above is/are correct?