152568 When the temperature difference between the hot junctions of a given thermocouple is $120^{\circ} \mathrm{C}$, the thermo emf is $30 \mathrm{mV}$. The temperature of junction is decreased by $20^{\circ} \mathrm{C}$ and cold junction's temperature is increased by $6^{\circ} \mathrm{C}$. The percentage decrease in thermo emf is (assume thermo emf is directly proportional to the temperature difference)
152569 Copper and carbon wires are connected in series and the combined resistor is kept at $0^{\circ} \mathrm{C}$. Assuming the combined resistance does not vary with temperature, the ratio of the resistances of carbon and copper wires at $0^{\circ} \mathrm{C}$ is (Temperature coefficients of resistivity of copper and carbon respectively are $4 \times 10^{-3} /{ }^{\circ} \mathrm{C}$ and $-0.5 \times 10^{-3} /{ }^{0} \mathrm{C}$ )
152570 A battery of emf $2.1 \mathrm{~V}$ and internal resistance $0.05 \Omega$ is shunted for $5 \mathrm{~s}$ by a wire of constant resistance $0.02 \Omega$ mass $1 \mathrm{~g}$ and specific heat 0.1 $\mathrm{cal} / \mathrm{g} /{ }^{\circ} \mathrm{C}$. The rise in the temperature of the wire is
152571 The current in a circuit containing a battery connected to $2 \Omega$ resistance is $0.9 \mathrm{~A}$. When a resistance of $7 \Omega$ is connected to the same battery, the current observed in the circuit is $0.3 \mathrm{~A}$. Then the internal resistance of the battery is
152568 When the temperature difference between the hot junctions of a given thermocouple is $120^{\circ} \mathrm{C}$, the thermo emf is $30 \mathrm{mV}$. The temperature of junction is decreased by $20^{\circ} \mathrm{C}$ and cold junction's temperature is increased by $6^{\circ} \mathrm{C}$. The percentage decrease in thermo emf is (assume thermo emf is directly proportional to the temperature difference)
152569 Copper and carbon wires are connected in series and the combined resistor is kept at $0^{\circ} \mathrm{C}$. Assuming the combined resistance does not vary with temperature, the ratio of the resistances of carbon and copper wires at $0^{\circ} \mathrm{C}$ is (Temperature coefficients of resistivity of copper and carbon respectively are $4 \times 10^{-3} /{ }^{\circ} \mathrm{C}$ and $-0.5 \times 10^{-3} /{ }^{0} \mathrm{C}$ )
152570 A battery of emf $2.1 \mathrm{~V}$ and internal resistance $0.05 \Omega$ is shunted for $5 \mathrm{~s}$ by a wire of constant resistance $0.02 \Omega$ mass $1 \mathrm{~g}$ and specific heat 0.1 $\mathrm{cal} / \mathrm{g} /{ }^{\circ} \mathrm{C}$. The rise in the temperature of the wire is
152571 The current in a circuit containing a battery connected to $2 \Omega$ resistance is $0.9 \mathrm{~A}$. When a resistance of $7 \Omega$ is connected to the same battery, the current observed in the circuit is $0.3 \mathrm{~A}$. Then the internal resistance of the battery is
152568 When the temperature difference between the hot junctions of a given thermocouple is $120^{\circ} \mathrm{C}$, the thermo emf is $30 \mathrm{mV}$. The temperature of junction is decreased by $20^{\circ} \mathrm{C}$ and cold junction's temperature is increased by $6^{\circ} \mathrm{C}$. The percentage decrease in thermo emf is (assume thermo emf is directly proportional to the temperature difference)
152569 Copper and carbon wires are connected in series and the combined resistor is kept at $0^{\circ} \mathrm{C}$. Assuming the combined resistance does not vary with temperature, the ratio of the resistances of carbon and copper wires at $0^{\circ} \mathrm{C}$ is (Temperature coefficients of resistivity of copper and carbon respectively are $4 \times 10^{-3} /{ }^{\circ} \mathrm{C}$ and $-0.5 \times 10^{-3} /{ }^{0} \mathrm{C}$ )
152570 A battery of emf $2.1 \mathrm{~V}$ and internal resistance $0.05 \Omega$ is shunted for $5 \mathrm{~s}$ by a wire of constant resistance $0.02 \Omega$ mass $1 \mathrm{~g}$ and specific heat 0.1 $\mathrm{cal} / \mathrm{g} /{ }^{\circ} \mathrm{C}$. The rise in the temperature of the wire is
152571 The current in a circuit containing a battery connected to $2 \Omega$ resistance is $0.9 \mathrm{~A}$. When a resistance of $7 \Omega$ is connected to the same battery, the current observed in the circuit is $0.3 \mathrm{~A}$. Then the internal resistance of the battery is
152568 When the temperature difference between the hot junctions of a given thermocouple is $120^{\circ} \mathrm{C}$, the thermo emf is $30 \mathrm{mV}$. The temperature of junction is decreased by $20^{\circ} \mathrm{C}$ and cold junction's temperature is increased by $6^{\circ} \mathrm{C}$. The percentage decrease in thermo emf is (assume thermo emf is directly proportional to the temperature difference)
152569 Copper and carbon wires are connected in series and the combined resistor is kept at $0^{\circ} \mathrm{C}$. Assuming the combined resistance does not vary with temperature, the ratio of the resistances of carbon and copper wires at $0^{\circ} \mathrm{C}$ is (Temperature coefficients of resistivity of copper and carbon respectively are $4 \times 10^{-3} /{ }^{\circ} \mathrm{C}$ and $-0.5 \times 10^{-3} /{ }^{0} \mathrm{C}$ )
152570 A battery of emf $2.1 \mathrm{~V}$ and internal resistance $0.05 \Omega$ is shunted for $5 \mathrm{~s}$ by a wire of constant resistance $0.02 \Omega$ mass $1 \mathrm{~g}$ and specific heat 0.1 $\mathrm{cal} / \mathrm{g} /{ }^{\circ} \mathrm{C}$. The rise in the temperature of the wire is
152571 The current in a circuit containing a battery connected to $2 \Omega$ resistance is $0.9 \mathrm{~A}$. When a resistance of $7 \Omega$ is connected to the same battery, the current observed in the circuit is $0.3 \mathrm{~A}$. Then the internal resistance of the battery is