The waves received by radio and TV stations are;

1. Radiowaves
2. I.R waves
3. Microwaves
4. Visible rays
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Answer: A
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Radio isotope iodine-131 is a source of;

1. Radiowaves
2. I.R waves
3. Microwaves
4. Gamma rays
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Answer: D
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Radio isotope iodine-131 is used in the treatment of;

1. skin cancer
2. thyroid cancer
3. anemia
4. Rickets
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Answer: B
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Gamma rays are produced by;

1. oscillating electronic circuits
2. cell phones
3. unstable nuclei of radioactive elements
4. hot objects
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Answer: C
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Gamma rays are used in;

1. cancer treatment
2. sterilization of medical equipments
3. food preservation
4. all of these
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Answer: D
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The rays used to create images of teeth and bones are;

1. x-rays
2. I.R waves
3. gamma rays
4. Visible rays
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Answer: A
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Which rays coming from the sun strike our skin and enable it to make vitamin D?

1. ultravoilet rays
2. Visible light
3. gamma rays
4. I.R waves
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Answer: A
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Source of Ultravoilet rays is:

1. sun
2. stars and other hot objects in space
3. arcs and gas discharegs
4. all of these
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Answer: D
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Ultravoilet rays are used:

1. in tanning salons
2. to detect forged bank notes
3. to identify stolen goods
4. all of these
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Answer: D
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Which of the following radiation is used to identify fake currency notes?

1. ultravoilet rays
2. Visible light
3. gamma rays
4. microwaves
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Answer: A
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