» CBSE Physics Thermal and Chemical Effect Expected Questions : Unit III

CBSE Physics Thermal and Chemical Effect Expected Questions : Unit III

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Long Answer Type Question

Q. 1. State Faraday’s laws of electrolysis. Define E.C.E. and faraday.
Answer :

Q. 2. Explain electrolysis of Cu SO₄ solution.
Answer :

Q. 3. A fuse wire with a circular cross-sectional radius of 0.2 mm just blows off at 25A. What should be the radius of cross-section of fuse made of the same material which blows off at 50 A ?
Answer :

Q. 4. Two wires made of tinned copper having identical cross- section of 10^-6m² and length 10 cm and 15 cm are to be used as fuses. Show that the fuse . Show that the same value of current in each case.
Answer :

Q. 5. What is the effect of temperature on thermo e.m.f. ? Hence define thermo electric power.
Answer :

Q. 6. Define Seebeck coefficient and Peltier coefficient ? Write the relationship between them ?
Answer :

Q. 7. Thermoelectric e.m.f. of a copper constantan thermocouple and temperature 6 of the hot junction and θ^°C at cold junction are found to satisfy

E = αθ + βθ²

where E is in µV; θ in C and α - 41µV^°C^-1; β = 0.041µV^°C^-2. What is the maximum temperature of the hot junction, when the thermo e.m.f. is measured to be 5.5 mV ?
Answer :

Q. 8. The e.m.f. of a Cu-Fe thermocouple varies with temperature 9 of the hot junction with cold at ^°C as
Answer :

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