Current electricity

[amp_mcq option1=”It takes in proton” option2=”Its atoms are removed” option3=”It gives away electrons” option4=”It gives away positive charge” correct=”option3″]

Detailed SolutionA glass rod when rubbed with silk cloth is charged because

[amp_mcq option1=”To prevent leakage of current” option2=”To prevent shock” option3=”Both of above factors” option4=”None of above factors” correct=”option3″]

Detailed SolutionThe insulation on a current carrying conductor is provided

[amp_mcq option1=”A column of mercury” option2=”A cube of carbon” option3=”A cube of copper” option4=”The unit length of wire” correct=”option1″]

Detailed SolutionInternational ohm is defined in terms of the resistance of

[amp_mcq option1=”400 Ohms” option2=”600 Ohms” option3=”800 Ohms” option4=”1000 Ohms” correct=”option3″]

Detailed SolutionA light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is

[amp_mcq option1=”Zinc” option2=”Lead” option3=”Mercury” option4=”Copper” correct=”option3″]

Detailed SolutionWhich of the following materials has the least resistivity ?

[amp_mcq option1=”Voltage” option2=”Current” option3=”Power” option4=”Resistance” correct=”option3″]

Detailed SolutionWhich of the following quantities remain the same in all parts of a series circuit?

[amp_mcq option1=”Length of heating element should be decreased” option2=”Length of heating element should be increased” option3=”Length of heating element has no effect on heating if water” option4=”None of the above” correct=”option1″]

Detailed SolutionIn an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains

[amp_mcq option1=”Decreases” option2=”Increases” option3=”First increases and then decreases” option4=”Remains constant” correct=”option1″]

Detailed SolutionWith rise in temperature the resistance of semiconductors

[amp_mcq option1=”6.4 A, 6.9 A” option2=”6.4 A, 9.6 A” option3=”4.6 A, 6.9 A” option4=”4.6 A, 9.6 A” correct=”option3″]

Detailed SolutionA current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is

[amp_mcq option1=”The highest resistance has the most of the current through it” option2=”The lowest resistance has the highest voltage drop” option3=”The lowest resistance has the highest current” option4=”The highest resistance has the highest voltage drop” correct=”option4″]

Detailed SolutionIn a series circuit with unequal resistances