[amp_mcq option1=”Input power” option2=”Losses” option3=”True component of power” option4=”kWh consumed” correct=”option2″]
Detailed SolutionIf the efficiency of a machine is to be high, what should be low?
Current electricity
2. The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is
[amp_mcq option1=”50%” option2=”60%” option3=”100%” option4=”150%” correct=”option3″]
3. A rheostat differs from potentiometer in the respect that it
[amp_mcq option1=”Has lower wattage rating” option2=”Has higher wattage rating” option3=”Has large number of turns” option4=”Offers large number of tapping” correct=”option1″]
Detailed SolutionA rheostat differs from potentiometer in the respect that it
4. If a parallel circuit is opened in the main line, the current
[amp_mcq option1=”Increases in the branch of the lowest resistance” option2=”Increases in each branch” option3=”Is zero in all branches” option4=”Is zero in the highest resistive branch” correct=”option3″]
Detailed SolutionIf a parallel circuit is opened in the main line, the current
5. The substances which have a large number of free electrons and offer a low resistance are called
[amp_mcq option1=”Insulators” option2=”Inductors” option3=”Semiconductors” option4=”Conductors” correct=”option4″]
6. Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is
[amp_mcq option1=”5 ohms” option2=”10 ohms” option3=”15 ohms” option4=”55 ohms” correct=”option3″]
7. An electric filament bulb can be worked from
[amp_mcq option1=”D.C. supply only” option2=”A.” option3=”supply only B. A.C. supply only C. Battery supply only” option4=”All above” correct=”option4″]
Detailed SolutionAn electric filament bulb can be worked from
8. A resistance having rating 10 ohms, 10 W is likely to be a
[amp_mcq option1=”Metallic resistor” option2=”Carbon resistor” option3=”Wire wound resistor” option4=”Variable resistor” correct=”option3″]
Detailed SolutionA resistance having rating 10 ohms, 10 W is likely to be a
9. For testing appliances, the wattage of test lamp should be
[amp_mcq option1=”Very low” option2=”Low” option3=”High” option4=”Any value” correct=”option1″]
Detailed SolutionFor testing appliances, the wattage of test lamp should be
10. When one leg of parallel circuit is opened out the total current will
[amp_mcq option1=”Reduce” option2=”Increase” option3=”Decrease” option4=”Become zero” correct=”option1″]
Detailed SolutionWhen one leg of parallel circuit is opened out the total current will