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Science True-False

Electricity · CBSE STD 10 (CBSE - English Medium). 3 questions.

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3 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
The nature of increase/decrease in resistivity of a metal and insulator are the same. [True/ False]
Answer
True.
Explanation:
For semiconductors and insulators, the charge density increases when the temperature is increased. It compensates the decrease in the value. Hence the resistivity decreases when the
temperature decreases.
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Question 21 Mark
When resistors are connected in parallel, the sum of the currents in them is the current drawn from cell. [True/ False]
Answer
True.
Explanation:
To calculate the total overall resistance of a number of resistors connected in this way you add up the individual resistances. This is done using the following formula:
R total $= R_1 + R_2+ R_3$​​​​​​​
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Question 31 Mark
When resistors are connected in series, the sum of the currents in them is the current drawn from cell. [True/ False]
Answer
True.
Explanation:
The same current flows through each resistor in series. Individual resistors in series do not get the total source voltage, but divide it. The total resistance in a series circuit is equal to the
sum of the individual resistances: RN(series) $= R_1+ R_2+ R_3+ … + RN.$
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