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1.

An electric kettle takes `4 A` current at `220 V`. How much time will it take to boil `1 kg` of wate from temperature `20^(@)C`? The temperature of boiling water is `100^(@)C`A. 6.3 minB. 8.4 minC. 12.6 minD. 4.2 min

Answer» Correct Answer - A
Discussion
2.

In producing chlorine through electrolysis `100 W` power at `125 V` is being consumed. How much chlorine per min is liberated ? `ECE` of chlorine is `0.367 xx 10^(6) kg//C`A. `1.76 xx10^(-3) kg `B. `9.67xx10^(-3) kg `C. `17.61xx10^(-3) kg `D. `3.67xx10^(-3) kg `

Answer» Correct Answer - C
Discussion
3.

A steady current of `1.5 A` flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is `30 xx 10^(-5) gC^(-1)`, the mass of copper deposited on the electrode will beA. 0.40 gB. 0.50 gC. 0.67 gD. 0.27 g

Answer» Correct Answer - D
Discussion
4.

Two cities are `150 km` apart. Electric power is sent from one city to another city through copper wire. The fall of km is `0.5 Omega`. The power less in the wire isA. `19.2 W`B. `19.2 kW`C. `19.2 J`D. `12.2 kW`

Answer» Correct Answer - B
Discussion
5.

If nearly `10^(5)` coulomb liberate `1 g` equivalent of aluminium, then the amount of aluminium (equivalent weight `9`) deposited through electrolysis in `20` minutes by a current of `50` amp will beA. `0.6 g`B. `0.09 g`C. `5.4 g`D. `10.8 g`

Answer» Correct Answer - C
Discussion
6.

Power dissipated across the `8 Omega` in the circuit shown here is `2 W`. The power dissiated in watt units across the `3 Omega` is A. `2.0`B. `1.0`C. `0.5`D. `3.0`

Answer» Correct Answer - D
Discussion
7.

A heating coil is labelled `100 W, 220 V`. The coil is cut in two equal halves and the two pieces are joined in parallel to the same source. The energy now liberated per second isA. `25 J`B. `50 J`C. `200 J`D. `400 J`

Answer» Correct Answer - D
Discussion
8.

A `5-A` wire can withstand a maximum power of `1W` in circuit. The resistance of the fuse wire isA. `0.2 Omega`B. `5 Omega`C. `0.4 Omega`D. `0.04 Omega`

Answer» Correct Answer - D
Discussion
9.

The charge flowing through a resistance `R` varies with time `t as Q = at - bt^(2)`. The total heat produced in `R` isA. `(a^(3)R)/(3b)`B. `(a^(3)R)/(2b)`C. `(a^(3)R)/b`D. `(a^(3)R)/(6b)`

Answer» Correct Answer - D
Discussion