76. A moving electron: A. Generates neither electric nor magnetic fields B. Gene

Question

76. A moving electron: A. Generates neither electric nor magnetic fields B. Generates an electric field C. Generates no measurable fields D. Generates a magnetic field E. Generates both electric and magnetic fields 77. When a wave passes through a slit (narrow opening), it: A. Speeds up B. Slows down C. Interferes D. Decreases in frequency E. Diffracts 78. The main reaction that releases energy in a thermonuclear bomb (H bomb) involves A. 238U B. 240 Pu C. Deuterium and Tritium D. Deuterium and Lithium E. All of the other options are correct 79. Which gasses released by humans contrubute most to the Greenhouse Heating? Select the option which lists them from Most to Least. (We are asking the total heating in atmosphere, not the per molecule heating) A. CO2, CHs, N2O, CFC-12 (-CCl2F) B. CFC-12 (-CCl2F2), CO2, CHs, N20, C. N2O, , CH,, CFC-12 (-CCI2F2) E. CHA, N2O, CFC-12 (-CChF2), CO2 80. A blackbody refers to: A. An object, which abosrbs all the visible light that incidents on it B. A perfect absorber and emiter of light C. An object, which absorbs all the light incidents on it D. An object that only absorbs light but does not emit any. E. Any solid body. Thus, all blackbodies are solids

Explanation / Answer

76. (E) A moving electron produces an electric as well as magnetic field. It produces an electric field because it's a charge particle. But when it is at rest, it doesn't produce a magnetic field.

77. (E) According to the Huygen's Principle wave will diffracts.

78. All of the above.

79. (A) CO2 (75%), CH4 (14%), N2O (8%), FLORIDE GASES (1%)

80. (B)

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