151. Waves used for telecommunication are-

1. Visible light
2. Infrared
3. Ultraviolet
4. Microwave

Option “4” is correct.
The microwaves are high-frequency signals in the 300 MHz to 300 Ghz range. The signals can carry thousands of channels at the same time, making it a very versatile communication system. Microwave is often used for point-to-point telecommunications. Today microwave is employed by telecommunication industry in the form of both terrestrial relays and satellite communication.
152. A dynamo which is said to generate electricity actually acts as a-

1. Source of ions
2. Source of electric charge
3. Converter of energy
4. Source of electrons

Option “3” is correct.
A dynamo, which is also known as an electrical generator produces direct current through a commutator. It is basically a device which converts mechanical rotation into electric current according to Faraday’s law.
153. Which one of the following atomic plants of India is located in the IV Seismic Zone?

1. Kaiga
2. Kalpakkam
3. Narora
4. Tarapur

Option “3” is correct.
Narora power station is located in the IV Seismic Zone. Kalpakkam is located into the II Seismic Zone. Kaiga and Tarapur are located into the III Seismic zone.
154. Who invented Dynamite?

1. J B Dunlop
2. Alfred Nobel
3. James Simons
4. Peter Hargreaves

Option “2” is correct.
Dynamite is an explosive made of nitroglycerin, sorbents (such as powdered shells or clay) and stabilizers. It was invented by the Swedish chemist and engineer Alfred Nobel.
155. A biotechnique in which ultrasonic sound is used-

1. Sonography
2. E.C.G
3. E.E.G
4. X-ray

Option “1” is correct.
Sonography or ultrasonography is an important mean of clinical diagnosis. It is a diagnostic imaging technique based on the application of ultrasound. It is widely used in the field of medical science.
156. Bats can fly during dark nights and also prey. This is because-

1. The pupil of their eyes is large
2. Their night vision is very good
3. Every birds can do this
4. They produce ultrasonic waves and are guided by them

Option “4” is correct.
Bats are a fascinating group animals. They are one of the few mammals that can use ultrasonic sound to navigate. As they fly, make an ultrasonic (shouting) sound. The returning echoes give the bats information about anything that is ahead of them, including the speed and size of an insect and which way it is going. This system of finding prey is called echolocation-locating things by their echoes.
157. If a gas is compressed to half of its original volume at 27°C, to what temperature should it be heated to make it occupy is original, volume?

1. 327°C
2. 600°C
3. 54°C
4. 300°C

Option “1” is correct.
According to the law of gases
From formula = V_1/V_2 =T_1/T_2
V_1=V/2 and V_2=V[given]
T_1=273+27=300K
T_2= ?
(V/2)/V=300/T_2 ⇒T_2=600K
∴T_2=600-273=327°C .
158. When pressure is increased, the melting point of ice –

1. Increases
2. Does not change
3. Decreases
4. Depends on the impurities in the ice

Option “3” is correct.
When pressure is increased, the melting point of ice decreases.
159. Sprayer functions are based on –

1. Bernoulli’s principle
2. Archimedes’ principle
3. Pascal’s law
4. Floatation principle

Option “1” is correct.
Sprayer functions are based on Bernoulli’s principle.
160. The material used in the fabrication of a transistor is –

1. Aluminum
2. Copper
3. Silicon
4. Silver

The fabrication of the transistor is the process of creating the transistor that is used in electrical and electronics circuit. Transistors are made from very pure silicon or germanium, but certain other semiconductor materials can also be used.Option “3” is correct.
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