Heating and Chemical Effect of Current - Rajasthan Board (RBSE) STD 12 Science Physics Questions

Q 1M.C.Q (1 Marks)1 Mark

A silver and a copper voltmeters are connected in parallel across a $6$ volt battery of negligible resistance. In half an hour, $1 \ gm$ of copper and $2 \ gm$ of silver are deposited. The rate at which energy is supplied by the battery will approximately be $($Given $\text{E.C.E.}$ of copper $=3.294 \times 10^{-4} \mathrm{~g} / \mathrm{C}$ and $\text{E.C.E.}$ of silver $=1.118 \left.\times 10^{-3} \mathrm{~g} / \mathrm{C}\right)$

A
$64 W$
B
$32 W$
C
$96 W$
✓
$16 W$

Answer: D.

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Q 2M.C.Q (1 Marks)1 Mark

Peltier co$-$efficient of a thermo couple is $2$ nano volts. How much heat is developed at a junction if $2.5 \ \text{amp}$ current flows for $2$ minute

✓
$6$ ergs
B
$6 \times 10^{-7}$ ergs
C
$16$ ergs
D
$6 \times 10^{-3} \mathrm{erg}$

Answer: A.

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Q 3M.C.Q (1 Marks)1 Mark

An expression for rate of heat generated, if a current of $I$ ampere flows through a resistance of $R \Omega,$ is

A
$\mathrm{I}^2 \mathrm{Rt}$
✓
$\mathrm{I}^2 \mathrm{R}$
C
$\mathrm{V}^2 \mathrm{R}$
D
$\text{IR}$

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark

The temperature of the cold junction of thermo$-$couple is $0^{\circ} \mathrm{C}$ and the temperature of hot junction is $\mathrm{T}^{\circ} \mathrm{C}$. The $e.m.f.$ is $\mathrm{E}=16 \mathrm{~T}-0.04$ $\mathrm{T}^2 \mu$ volts. The temperature of inversion is

A
$200^{\circ} \mathrm{C}$
✓
$400^{\circ} \mathrm{C}$
C
$100^{\circ} \mathrm{C}$
D
$300^{\circ} \mathrm{C}$

Answer: B.

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Q 5M.C.Q (1 Marks)1 Mark

A steady current of $5$ amps is maintained for $45$ mins . During this time it deposits $4.572 \ gm$ of zinc at the cathode of a voltameter. $\text{E.C.E.}$ of zinc is

✓
$3.387 \times 10^{-4} \mathrm{gm} / \mathrm{C}$
B
$3.387 \times 10^{-4} \mathrm{C} / \mathrm{gm}$
C
$3.384 \times 10^{-3} \mathrm{gm} / \mathrm{C}$
D
$3.394 \times 10^{-3} \mathrm{C} / \mathrm{gm}$

Answer: A.

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