Question : Electrical conductance through metals is called electronic conductance and it ______.
Option 1: does not depend on the temperature
Option 2: decreases with an increase in temperature
Option 3: increases with an increase in temperature
Option 4: decreases with a decrease in temperature
Correct Answer: decreases with an increase in temperature
Solution : The correct answer is decreases with an increase in temperature.
When the material is heated, more and more of the loosely bound carriers escape and become free to conduct. Once all of the soon-to-be-mobile carriers in a semiconductor are fully activated, it behaves like a metal and additional temperature rises cause it to lose conductivity. The resistivity of metals normally increases with temperature, whereas the resistivity of semiconductors often decreases with temperature.
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Question : What will happen to the level of water in a vessel when a piece of ice floating in it melts?
Option 1: Decreases
Option 2: Increases
Option 3: Remains same
Option 4: First increases and then decreases
Question : Pressure cooker cooks faster because:
Option 1: The boiling point decreases with the rise in pressure.
Option 2: It cooks the food at low pressure.
Option 3: A higher temperature is attained for cooking.
Option 4: The material of the cooker is a good conductor.
Question : If a firm is operating at a loss in the short period in perfect combination, it should:
Option 1: decrease the production and price
Option 2: increase the production and price
Option 3: continue to operate as long as it covers even the variable costs
Option 4: shut down and leave the industry
Question : Carrot is orange in colour because:
Option 1: It grows in the soil.
Option 2: It is not exposed to sunlight.
Option 3: It contains carotene.
Option 4: The entire plant is orange in colour.
Question : The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
My granny says that / it is quite all right / to get married young, / though I do not absolute agree with her a bit on this.
Option 1: My granny says that
Option 2: though I do not absolute agree with her a bit on this.
Option 3: it is quite all right
Option 4: to get married young
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