Option “4” is correct. The most common nuclear fuels are uranium – 235 (235U) and plutonium -239(239Pu). Thorium is more abundant in nature than uranium. Thorium can be used as a nuclear fuel through breeding to uranium-233 (U-233). Lead is not used as a nuclear fuel.
112. The gas used in discharge tubes for optical decoration and advertising is-
Option “4” is correct. The neon gas is used in discharge lamps, tubes and in fluorescent bulbs.
113. Which one of the following pairs is not correctly matched:
1. Discovery of Meson – Hideki Yukawa
2. Discovery of Positron – C.D. Anderson and U.F. Hess
3. Theory of energy production in the sun and stars – H.A. Bethe
4. Synthesis of transuranic elements – Enrico Fermi transuranic elements
Option “4” is correct. In 1935 Meson particles were discovered by Japanese physicist Hideki Yukawa. Positron, the antiparticle of the antimatter counterpart of the electron was discovered by C.D. Anderson and U.F. Hess in 1932. In 1939, Hans Bethe described the nuclear reactions that power the sun and other starts. In synthesis of transuranic elements, Glenn T. Scaborg played an important role instead of Enrico Fermi. The fact is that he attempted to prepare a transuranium element in 1934 in Rome but failed to do so.
Option “2” is correct. The density of water increases with temperature but volume decreases. At 4°C, the volume of water is low and density is maximum. Conversion of Celsius in Kelvin K = C + 273 = 4 + 273 = 277 So, the density of water is maximum at 277 K.
115. The technique to integrate and mark the image of a three- Dimensional object is-
Option “4” is correct. Holography is a technique of producing a three-dimensional image of an object.
116. Which type of electromagnetic radiation is used in the remote control of a television receiver?
1. Visible
2. Ultra-violet
3. Infra-red
4. None of the above
Option “3” is correct. Most remote controls of a television receiver send signals using Infra-red radiation.
117. Which one of the following is not correct:
1. Theory of evolution was propounded by Charles Darwin.
2. The breaking apart of the nucleus of an atom is called fusion.
3. ‘Dry ice’ is nothing but solid carbon dioxide.
4. Telephone was invented by Graham Bell.
Option “2” is correct. Option (b) is not correct. It is because the breaking apart of nucleus of an atom is called fission not fusion. Fission is a radioactive decay process in which the nucleus of an atom splits into smaller parts.
118. Among the following radiations, which has the highest energy?
1. Visible
2. X-ray
3. Ultra-violet
4. Infra-red
Option “2” is correct. The correct order of the following different categories of radiations are -x-rays > ultraviolet > visible light > infrared. The electromagnetic spectrum of radio waves has the lowest energy while Gama rays consist of highest energy.
119. How many watts are there in a horsepower?
1. 1000
2. 750
3. 746
4. 748
Option “3” is correct. Horse power is a unit of measurement of power (the rate at which work is done). 1 Watt = 1 Joule/second 1 Horse power = 746 watt.
120. Pyrometer is used to measure-
1. Air pressure
2. Humidity
3. High temperature
4. Density
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