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1) The polymer used in making plastic crockery is
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2) Water is not effective in extinguishing a fire caused by petrol as
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3) Aspirin is
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4) The major harmful gas emitted by automobile vehicle which causes air pollution is
Explanation :
Dilute sulfuric acid {H2 SO4} serves as the electrolyte in a lead storage battery. The electrodes of the cells in a lead storage battery consist of lead grids. The openings of the anodic grid is filled with spongy (porous) lead. The openings of the cathodic grid is filled with lead dioxide {PbO2}.
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5) The metal that does not give H2 on treatment with dilute HCl is
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6) The angle in which a cricket ball should be hit to travel max. horizontal distance is:
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7) Which among the given is a radioactive element
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.
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8) Synthetic detergents are prepared from
Explanation :
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general science mcq questions and answers for competitive exams /
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
View Answer Discuss in Forum
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
View Answer Discuss in Forum
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.
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9) When Arsenic atoms are added to Germanium lattice, it becomes a/an
Explanation :
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general science mcq questions and answers for competitive exams /
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
View Answer Discuss in Forum
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
View Answer Discuss in Forum
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
View Answer Discuss in Forum
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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10) The tendency for complex formation is maximum in
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