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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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5
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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 $\epsilon.$ 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
Find the amount of silver liberated at cathode if $0.500A$ of current is passed through $AgNO_3$ electrolyte for $1$ hour. Atomic weight of silver a $107.9\ g/mole.$
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Q 32 Marks Questions2 Marks
Find the thermo-emf developed in a copper$-$silver thermocouple when the junctions are kept at $0^\circ C$ and $40^\circ C$. Use the data in table.
 
Metal with
$a$
$b$
lead $(Pb)$
$\mu\text{V}/^\circ\text{C}$
$\mu\text{V}/^\circ(\text{C})^2$
Aluminium
 $-0.47$ $0.003$
Bismuth
 $-43.7$ $-0·47$
Copper
 $2.76$ $0·012$
Gold
 $2.90$ $0.0093$
Iron
 $16.6$ $-0.030$
Nickel
 $19.1$ $-0.030$
Platinum
 $-1.79$ $-0.035$
Silver
 $2.50$ $0.012$
Steel
 $10.8$ $-0.016$
 
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Q 42 Marks Questions2 Marks
Find the neutral temperature and inversion temperature of a copper-iron thermocouple if the reference junction is kept at $0^\circ C.$ Use the data in the table.
 
Metal with
$a$
$b$
lead $(Pb)$
$\mu\text{V}/^\circ\text{C}$
$\mu\text{V}/^\circ(\text{C})^2$
Aluminium
 $-0.47$ $0.003$
Bismuth
 $-43.7$ $-0·47$
Copper
 $2.76$ $0·012$
Gold
 $2.90$ $0.0093$
Iron
 $16.6$ $-0.030$
Nickel
 $19.1$ $-0.030$
Platinum
 $-1.79$ $-0.035$
Silver
 $2.50$ $0.012$
Steel
 $10.8$ $-0.016$
 
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Q 52 Marks Questions2 Marks
As temperature increases, the viscosity of liquids decreases considerably. Will this decrease the resistance of an electrolyte as the temperature increases?
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Q 62 Marks Questions2 Marks
A brass plate having surface area $200\ cm^2$ on one side is electroplated with $0.10\ mm$ 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 83 Marks Question3 Marks
A plate of area $10\ cm^2$ is to be electroplated with copper $($density $9000\ kg/m^3)$ to a thickness of $10$ micrometres on both sides, using a cell of $12V$. Calculate the energy spent by the cell in the process of deposition. If this energy is used to heat $100g$ of water, calculate the rise in the temperature of the water. $\text{ECE}$ of copper $= 3 \times 10^{-7}\ kg \ C^{-1}$ and specific heat capacity of water $= 4200J\ kg^{-1}.$
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Q 93 Marks Question3 Marks
A coil of resistance $100\Omega$ is connected across a battery of emf $6.0V$. Assume that the heat developed in the coil is used to raise its temperature. If the heat capacity of the coil is $4.0J/K,$ how long will it take to raise the temperature of the coil by $15^\circ C$?
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Q 113 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 125 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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Q 135 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 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 $5\ mm^2.$ 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 165 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 $0.5\ mm^2,$ what length of the wire will be needed?
  3. If the radius of each turn is $4.0\ mm,$ how many turns will be there in the coil?
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