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Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?
The following sentences form a paragraph. The first and the last sentences of the paragraph are given. The rest of the sentences are numbered as P, Q, R and S. These four parts are not given in their proper order. Read the sentences and choose the alternative that arranges them in the correct order. 1. The problem of water pollution is rampant in all thickly-populated areas, especially urban conglomerates. P. Also, the Bhopal gas leak tragedy of December 2/3, 1984 was a consequence of the release of poisonous Methyl Isocyanate from the Union Carbide plant producing pesticides and insecticides. Q. The problem intensifies with the addition of pollutants in our waterways from any sources; radioactive wastes from factories, laboratories and hospitals; fallout from nuclear explosions domestic wastes from the cities and towns, chemical wastes from factories and industrial units, etc. R. No doubt water does possess a self-cleaning property, but there is a limit to it.  S. Persons with a higher DDT content in their fatty tissues are afflicted with brain tumour, higher blood pressure and malfunctioning of the liver. 6. Contemporary pessimism, however, goes far beyond this traditional worry about the state of affairs.
Nuclear wastes is waste that contains radioactive material. Radioactive material is normally a by product of nuclear power generation. Radioactive waste is regulated by government agencies in order to protect human health and the environment. Radioactivity naturally decays over time, so radioactive waste has to be isolated and confined in appropriate disposal facilities for a sufficient period until it no longer poses a threat. Which of the following statements can be inferred from the paragraph?
Which of the following statements are true?
1. All radioactive elements decay exponentially with time.
2. Half-life time of radioactive elements is the time required for one-half of the radioactive atoms to disintegrate.
3. Age of the earth can be determined by radioactive dating.
4. Half-life time of a radioactive element is fifty percent of its average life period.
Select the correct answer:
Non-hazardous solid wastes are the hazardous wastes which are excused from _________ regulations.
Food irradiation technology uses which of the following rays or beams: X-Rays Gama Rays Electron beams Infrared rays
Which of the following statements regarding the penetrating power of radioactive decays? α-rays have low penetrating power than γ-rays Beta rays can penetrate a 5 mm aluminum sheet. Gama has the highest penetrating power.
A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series. Gama rays, X­rays, Ultraviolet rays, ? , Infrared rays
Biodegradable wastes are less harmful pollutants to us than non-biodegradable wastes. Which of the following groups contains only biodegradable wastes?
The following question consists of six sentences of a passage. The first and the sixth sentences are given in the beginning as S1 and S6. The middle four sentences in each have been jumbled up and labelled P, Q, R and S. You are required to find the proper sequence of the four sentences and mark your response accordingly. S1 : One of the many young scientists who chose to throw in their lot with Rutherford was an Oxford physical chemist, Frederick Soddy. S6 : We now know that Gamma rays are a particularly fierce form of X-rays. P : His association with Rutherford lasted only two years, but that was long enough to change the whole face of physics. Q : He was just 23. R : They found that thorium changed into a new element , thorium X, and in the process gave off what was apparently a gas and at the same time a third type of ray, which they named after the Greek letter ‘Gamma’. S : When he teamed up with Rutherford, they investigated thorium which, as Marie Curie had shown, was radioactive. The proper sequence should be