357536
Assertion : Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot. Reason : Resistance decreases due to decrease in temperature.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
When current flows through a metallic wire, it heats up due to electrical resistance, causing an increase in resistance, not a decrease. Pouring cold water on one portion cools it, reducing resistance and allowing more current, while the hot portion maintains higher resistance, heating further. Reason is true and Assertion is true. So correct option is (1).
PHXII03:CURRENT ELECTRICITY
357537
A resistor connected to a battery is heated due to current through it. Which of the following quantity does not vary?
1 Drift velocity
2 Resistivity
3 Resistance
4 Number of free electron
Explanation:
Conceptual Question
PHXII03:CURRENT ELECTRICITY
357538
Copper and Germanium are cooled from room temperature to 100 \(K\). Then the resistance of ?
1 Germanium decreases, Copper increases
2 Germanium decreases, Copper decreases
3 Germanium increases, Copper decreases
4 Germanium increases, Copper increases
Explanation:
The temperature coefficient of resistance of copper is positive and of germanium is negative. Hence the resistance of germanium increases and copper decreases with fall in temperature.
KCET - 2012
PHXII03:CURRENT ELECTRICITY
357539
The resistance \(R_{t}\) of a conductor varies with temperature as shown in figure. If the variation is represented \(R_{t}=R_{0}\left(1+\alpha t+\beta t^{2}\right)\), then
1 \(\alpha\) and \(\beta\) both are negative
2 \(\alpha\) is positive and \(\beta\) is negative
3 \(\alpha\) and \(\beta\) both are positive
4 \(\alpha\) is negative and \(\beta\) is positive
Explanation:
Graph indicates that resistance increases with increase in temperature so \(\alpha\) and \(\beta\) both are positive So, correct option is (3)
357536
Assertion : Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot. Reason : Resistance decreases due to decrease in temperature.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
When current flows through a metallic wire, it heats up due to electrical resistance, causing an increase in resistance, not a decrease. Pouring cold water on one portion cools it, reducing resistance and allowing more current, while the hot portion maintains higher resistance, heating further. Reason is true and Assertion is true. So correct option is (1).
PHXII03:CURRENT ELECTRICITY
357537
A resistor connected to a battery is heated due to current through it. Which of the following quantity does not vary?
1 Drift velocity
2 Resistivity
3 Resistance
4 Number of free electron
Explanation:
Conceptual Question
PHXII03:CURRENT ELECTRICITY
357538
Copper and Germanium are cooled from room temperature to 100 \(K\). Then the resistance of ?
1 Germanium decreases, Copper increases
2 Germanium decreases, Copper decreases
3 Germanium increases, Copper decreases
4 Germanium increases, Copper increases
Explanation:
The temperature coefficient of resistance of copper is positive and of germanium is negative. Hence the resistance of germanium increases and copper decreases with fall in temperature.
KCET - 2012
PHXII03:CURRENT ELECTRICITY
357539
The resistance \(R_{t}\) of a conductor varies with temperature as shown in figure. If the variation is represented \(R_{t}=R_{0}\left(1+\alpha t+\beta t^{2}\right)\), then
1 \(\alpha\) and \(\beta\) both are negative
2 \(\alpha\) is positive and \(\beta\) is negative
3 \(\alpha\) and \(\beta\) both are positive
4 \(\alpha\) is negative and \(\beta\) is positive
Explanation:
Graph indicates that resistance increases with increase in temperature so \(\alpha\) and \(\beta\) both are positive So, correct option is (3)
357536
Assertion : Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot. Reason : Resistance decreases due to decrease in temperature.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
When current flows through a metallic wire, it heats up due to electrical resistance, causing an increase in resistance, not a decrease. Pouring cold water on one portion cools it, reducing resistance and allowing more current, while the hot portion maintains higher resistance, heating further. Reason is true and Assertion is true. So correct option is (1).
PHXII03:CURRENT ELECTRICITY
357537
A resistor connected to a battery is heated due to current through it. Which of the following quantity does not vary?
1 Drift velocity
2 Resistivity
3 Resistance
4 Number of free electron
Explanation:
Conceptual Question
PHXII03:CURRENT ELECTRICITY
357538
Copper and Germanium are cooled from room temperature to 100 \(K\). Then the resistance of ?
1 Germanium decreases, Copper increases
2 Germanium decreases, Copper decreases
3 Germanium increases, Copper decreases
4 Germanium increases, Copper increases
Explanation:
The temperature coefficient of resistance of copper is positive and of germanium is negative. Hence the resistance of germanium increases and copper decreases with fall in temperature.
KCET - 2012
PHXII03:CURRENT ELECTRICITY
357539
The resistance \(R_{t}\) of a conductor varies with temperature as shown in figure. If the variation is represented \(R_{t}=R_{0}\left(1+\alpha t+\beta t^{2}\right)\), then
1 \(\alpha\) and \(\beta\) both are negative
2 \(\alpha\) is positive and \(\beta\) is negative
3 \(\alpha\) and \(\beta\) both are positive
4 \(\alpha\) is negative and \(\beta\) is positive
Explanation:
Graph indicates that resistance increases with increase in temperature so \(\alpha\) and \(\beta\) both are positive So, correct option is (3)
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
PHXII03:CURRENT ELECTRICITY
357536
Assertion : Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot. Reason : Resistance decreases due to decrease in temperature.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
When current flows through a metallic wire, it heats up due to electrical resistance, causing an increase in resistance, not a decrease. Pouring cold water on one portion cools it, reducing resistance and allowing more current, while the hot portion maintains higher resistance, heating further. Reason is true and Assertion is true. So correct option is (1).
PHXII03:CURRENT ELECTRICITY
357537
A resistor connected to a battery is heated due to current through it. Which of the following quantity does not vary?
1 Drift velocity
2 Resistivity
3 Resistance
4 Number of free electron
Explanation:
Conceptual Question
PHXII03:CURRENT ELECTRICITY
357538
Copper and Germanium are cooled from room temperature to 100 \(K\). Then the resistance of ?
1 Germanium decreases, Copper increases
2 Germanium decreases, Copper decreases
3 Germanium increases, Copper decreases
4 Germanium increases, Copper increases
Explanation:
The temperature coefficient of resistance of copper is positive and of germanium is negative. Hence the resistance of germanium increases and copper decreases with fall in temperature.
KCET - 2012
PHXII03:CURRENT ELECTRICITY
357539
The resistance \(R_{t}\) of a conductor varies with temperature as shown in figure. If the variation is represented \(R_{t}=R_{0}\left(1+\alpha t+\beta t^{2}\right)\), then
1 \(\alpha\) and \(\beta\) both are negative
2 \(\alpha\) is positive and \(\beta\) is negative
3 \(\alpha\) and \(\beta\) both are positive
4 \(\alpha\) is negative and \(\beta\) is positive
Explanation:
Graph indicates that resistance increases with increase in temperature so \(\alpha\) and \(\beta\) both are positive So, correct option is (3)
