The_____ of the metal is used to cut it using an oxy-acetylene flame.

1. Intensive oxidation
2. Evaporation
3. Both A and B
4. None of these
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Answer: A
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Case hardening is the only process suited for hardening low carbon steel. A case hardening procedure is defined as which of the following?

1. Intensive oxidation
2. Evaporation
3. Cyaniding
4. All of these
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Answer: C
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When compared to the parent metal to be welded, the filler material used in welding should have .

1. Same melting temperature
2. Same composition
3. Both A and B
4. None of these
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Answer: C
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The temperature at which the magnetic property of iron disappears and its electrical conductivity and specific heat change is known as the 'Curie point,' which is measured in degrees Celsius.

1. 760
2. 456
3. 345
4. 900
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Answer: A
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A cupola requires approximately tonne of coke to make one tonne of casting.

1. 0.4
2. 0.3
3. 0.05
4. 0.04
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Answer: B
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According to the periodic table of elements, the atomic number increases with increasing atomic number. The atomic size is the same in both cases.

1. Period decreases
2. Group increases
3. Both A and B
4. None of these
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Answer: C
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Satellites burn out as they re-enter the Earth's atmosphere due to the

1. Combustion with air
2. Interaction with the Earth's atmosphere
3. Both A and B
4. None of these
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Answer: B
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The joining of thin foils is best accomplished by

1. Microwaves
2. X-rays
3. Both A and B
4. None of these
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Answer: A
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The electrical conductivity of a semiconductor decreases as temperature rises.

1. Increases
2. decreae
3. Both A and B
4. None of these
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Answer: A
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In the industries, laser welding is commonly used.

1. mechanical
2. electrical
3. Both A and B
4. None of these
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Answer: B
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