column A column B a e-mail a missiles b artificial satellites b cooking gas c increasing means of entertainment c computer based communication device d Prithvi, Agni and Trishul d the telecommunication system d L.P.G. e sound pollution

column a column b a e-mail c computer-based communication device b artificial satellite d the telecommunication system c increasing means of entertainment e sound pollution d Prithvi, Agni and Trishul a missiles e L.P.G b cooking gas (a) E-mail: Computer-based communication device through the Internet on a computer. Electronic mail, commonly shortened to “email,” is a communication method that uses electronic devices to deliver messages across computer networks. "Email" refers to both the delivery system and individual messages that are sent and received. Hence, "a" matches with "c". (b) Artificial satellite : A man-made satellite is a machine that is launched into space and orbits around a body in space. Examples of man-made satellites include the Hubble Space Telescope and the International Space Station. It is usesd in telecommunication. Hence, "b" matches with "d". Increasing means of entertainment leads to sound pollusion. Some of its major causes are vehicles, aircraft, industrial machines, loudspeakers, crackers, etc. When used at high volume, some other appliances also contribute to noise pollution, like television, transistor, radio, etc. Hence, "c" matches with "e". (d) Prithvi, Agni and Trishul : Missiles are very important part of India's defence system. PRITHVI (Short range surface-to-surface ballistic missile) AGNI (Medium to intercontinental surface-to-surface missile) TRISHUL (Short range low-level surface-to-air missile). Hence, "d" matches with "a". (e) L . P.G. : Cooking gas (Liquefied petroleum gas / LPG) is more commonly known as LPG. It is actually a mixture of several hydrocarbon gases. It is used in homes for cooking, heating appliances and as fuel in some vehicles. Hence, "e" matches with "b".

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Science>Physics>Human, Science and Technology>Revolution in Various Fields by the Development of Science and Technology

	column A		column B
a	e-mail	a	missiles
b	artificial satellites	b	cooking gas
c	increasing means of entertainment	c	computer based communication device
d	Prithvi, Agni and Trishul	d	the telecommunication system
d	L.P.G.	e	sound pollution