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Thermal and Chemical Effect of Current Physics - Thermal and Chemical Effect of Current

Rajasthan Board (RBSE) - STD 12 Science - Physics (Rajasthan - English Medium). 32 questions in this chapter.

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Thermal and Chemical Effect of Current question types

32 questions across 4 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

32
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4
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Sample Questions

Thermal and Chemical Effect of Current questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 11 Marks Question1 Mark
Consider the situation shown in figure. The width of each plate is b. The capacitor plates are rigidly clamped in the laboratory and connected to a battery of emf $\in.$ All surfaces are frictionless. Calculate the value of M for which the dielectric slab will stay in equilibrium.
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Q 22 Marks Questions2 Marks
A brass plate having surface area $200cm^2$ on one side is electroplated with 0·10mm thick silver layers on both sides using a 15A current. Find the time taken to do the job. The specific gravity of silver is 10.5 and its atomic weight is 107.9 g/mol.
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Q 32 Marks Questions2 Marks
Is neutral temperature always the arithmetic mean of inversion temperature and the temperature of the cold junction? Does the unit of temperature have an effect in deciding this question?
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Q 42 Marks Questions2 Marks
Figure shows an electrolyte of AgCl through which a current is passed. It is observed that 2.68g of silver is deposited in 10 minutes on the cathode. Find the heat developed in the $20\Omega$ resistor during this period. Atomic weight of silver is 107.9g/mole.
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Q 62 Marks Questions2 Marks
An electroplating unit plates 3.0g of silver on a brass plate in 3.0 minutes. Find the current used by the unit. The electrochemical equivalent of silver is $1.12 × 10^{-6}\ kg\ C^{-1}$.
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Q 83 Marks Question3 Marks
The specification on a heater coil is 250V, 500W. Calculate the resistance of the coil. What will be the resistance of a coil of 1000W to operate at the same voltage?
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Q 103 Marks Question3 Marks
An electric bulb, when connected across a power supply of 220V, consumes a power of 60W. If the supply drops to 180V, what will be the power consumed? If the supply is suddenly increased to 240V, what will be the power consumed?
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Q 113 Marks Question3 Marks
A plate of area $10 \mathrm{~cm}^2$ is to be electroplated with copper (density $9000 \mathrm{~kg} / \mathrm{m}^3$ ) to a thickness of 10 micrometres on both sides, using a cell of 12 V . Calculate the energy spent by the cell in the process of deposition. If this energy is used to heat 100 g of water, calculate the rise in the temperature of the water. ECE of copper $=3 \times 10^{-7} \mathrm{~kg} \mathrm{C}^{-1}$ and specific heat capacity of water $=4200 \mathrm{Jkg}^{-1}$.
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Q 125 Marks Questions5 Marks
The coil of an electric bulb takes 40 watts to start glowing. If more than 40W is supplied, 60% of the extra power is converted into light and the remaining into heat. The bulb consumes 100W at 220V. Find the percentage drop in the light intensity at a point if the supply voltage changes from 220V to 200V.
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Q 135 Marks Questions5 Marks
A heater coil is to be constructed with a nichrome wire $(\rho=1.0\times10^{-6}\Omega-\text{m})$which can operate at 500W when connected to a 250V supply.
  1. What would be the resistance of the coil?
  2. If the cross-sectional area of the wire $0.5mm^2, $ what length of the wire will be needed?
  3. If the radius of each turn is 4.0mm, how many turns will be there in the coil?
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Q 145 Marks Questions5 Marks
A bulb with rating 250V, 100W is connected to a power supply of 220V situated 10m away using a copper wire of area of cross-section $5mm^2$. How much power will be consumed by the connecting wires? Resistivity of copper $1.7\times10^{-8}\Omega-\text{m}$.
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Q 155 Marks Questions5 Marks
A servo voltage stabiliser restricts the voltage output to 220V ± 1%. If an electric bulb rated at 220V, 100W is connected to it, what will be the minimum and maximum power consumed by it?
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