Current electricity Archives

1. If the efficiency of a machine is to be high, what should be low?

Input power

Losses

True component of power

kWh consumed

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Solution

2. The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is

50%

60%

100%

150%

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identical cross-section, for the same electrical resistance, is" class="read-more button" href="https://exam.pscnotes.com/mcq/the-weight-of-an-aluminium-conductor-as-compared-to-a-copper-conductor-of-identical-cross-section-for-the-same-electrical-resistance-is/#more-59620">Detailed Solution

3. A rheostat differs from potentiometer in the respect that it

Has lower wattage rating

Has higher wattage rating

Has large number of turns

Offers large number of tapping

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button" href="https://exam.pscnotes.com/mcq/a-rheostat-differs-from-potentiometer-in-the-respect-that-it/#more-59594">Detailed Solution

4. If a parallel circuit is opened in the main line, the current

Increases in the branch of the lowest resistance

Increases in each branch

Is zero in all branches

Is zero in the highest resistive branch

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a parallel circuit is opened in the main line, the current" class="read-more button" href="https://exam.pscnotes.com/mcq/if-a-parallel-circuit-is-opened-in-the-main-line-the-current/#more-59535">Detailed Solution

5. The substances which have a large number of free electrons and offer a low resistance are called

Insulators

Inductors

Semiconductors

Conductors

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288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube low resistance are called" class="read-more button" href="https://exam.pscnotes.com/mcq/the-substances-which-have-a-large-number-of-free-electrons-and-offer-a-low-resistance-are-called/#more-59123">Detailed Solution

6. Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is

5 ohms

10 ohms

15 ohms

55 ohms

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in parallel. The total resistance of the combination is" class="read-more button" href="https://exam.pscnotes.com/mcq/three-resistances-of-10-ohms-15-ohms-and-30-ohms-are-connected-in-parallel-the-total-resistance-of-the-combination-is/#more-58658">Detailed Solution

7. An electric filament bulb can be worked from

D.C. supply only

supply only B. A.C. supply only C. Battery supply only

All above

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0 576 512"> Subscribe on YouTube filament bulb can be worked from" class="read-more button" href="https://exam.pscnotes.com/mcq/an-electric-filament-bulb-can-be-worked-from/#more-58186">Detailed Solution

8. A resistance having rating 10 ohms, 10 W is likely to be a

Metallic resistor

Carbon resistor

Wire wound resistor

Variable resistor

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132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube a" class="read-more button" href="https://exam.pscnotes.com/mcq/a-resistance-having-rating-10-ohms-10-w-is-likely-to-be-a/#more-58062">Detailed Solution