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1) Why is phosphorus kept under water?
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2) Which among the given statements is right? I. German silver is an alloy of silver, copper and zinc II. There is no zinc in brass III. Bronze is an alloy of copper and tin
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3) Choose the inright statement from the following:
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4) M L2 T−2 is the dimensional formula for
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5) When Arsenic atoms are added to Germanium lattice, it becomes a/an
Explanation :
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Questions and Answers
4081. The angle in which a cricket ball should be hit to travel max. horizontal distance is:
A
60° with horizontal
B
30° with horizontal
C
15° with horizontal
D
45° with horizontal
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Answer & Explanation
Answer : Option D
Explanation :
45° with horizontal.This has to do with the equation of a parabola or trajectory which is z = (tanq)x – q 2 (cos) q x 2. We can see that if the ball is fired at a 45 degree angle from the ground, the horizontal distance will be a maximum.
4082. Which among the given is a radioactive element -
A
Chromium
B
Cobalt
C
Uranium
D
Argon
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Answer & Explanation
Answer : Option C
Explanation :
Uranium.Uranium (U) is a naturally occurring radioactive element. One of its isotopes, uranium-235, is the only naturally occurring isotope capable of sustaining a nuclear fission reaction. Its nucleus is unstable, so the element is in a constant state of decay, seeking a more stable ar- rangement.In fact, uranium was the element that made the discovery of radioactivity possible.
4083. Synthetic detergents are prepared from
A
glycerides
B
potassium salts of higher fatty-acids
C
hydrocarbons of petroleum
D
sodium salts of higher fattyacids
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Answer & Explanation
Answer : Option C
Explanation :
hydrocarbons of petroleum.Synthetic detergents are prepared from hydrocarbons of petroleum. Calcium & magnesium salts of detergents are soluble in water. They are sodium salts of a long chain benzene sulphonic acids or sodium salts of long chain alkyl hydrogen sulphates. So cleansing action of detergents remain unaffected in hard water.
4084. When Arsenic atoms are added to Germanium lattice, it becomes a/an
A
Insulator
B
Extrinsic semiconductor
C
Intrinsic semiconductor
D
Superconductor
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Answer & Explanation
Answer : Option B
Explanation :
When a pentavalent (donor) impurity, like arsenic, is added to germanium, it will form covalent bonds with the germanium atoms, leaving 1 electron relatively free in the crystal structure. Pure germanium may be converted into an N-type semiconductor by 'doping' it with any donor impurity having 5 valence electrons in its outer shell. Semiconductors which are doped in this manner - either with N- or P-type impurities - are referred toas EXTRINSIC semiconductors.
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6) Which of the given is used as a catalyst in the production of high octane fuels -
Explanation :
H2 SO4.Sulfuric acid is used as a catalyst for refining & for producing alkylate, an essential component of highoctane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value.
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7) Which of the following one of the following metals does not react with water to produce Hydrogen
Explanation :
Cadmium.Cadmium is a soft, malleable, ductile, bluish-white divalent metal. Unlike other metals, cadmium is resistant to corrosion & as a result it is used as a protective layer when deposited on other metals. It is similar in many respects to zinc but forms complex compounds. As a bulk metal, cadmium is insoluble in water & is not flammable; however, in its powdered form it may burn & release toxic fumes. Cadmium occurs as a minor component in most zinc ores & so is a byproduct of zinc production. It was used for a long time as a pigment & for corrosion resistant plating onsteel while cadmium compounds were used to stabilize plastic. With the exception of its use in nickel–cadmium batteries & cadmium telluride solar panels, the use of cadmium is generally decreasing. These declines have been due to competing technologies, cadmium's toxicity in certain forms & concentration & resulting regulations.
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8) Idioms and phrases for - Get over
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9) Idioms and phrases for - Give up
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10) Idioms and phrases for - A piece of cake
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