Accelerate NEET 2020: Current Electricity Class 4 (16.10.2019)

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Question 1

A heater coil is cut into two equal parts and only one part is now used in the heater. The heat generated will now be

• Aone fourth
• Bhalved
• Cdoubled
• Dfour times

Question 2

Conductivity is

• AInversely proportional to length of conductor
• BInversely proportional to temperature
• CDirectly proportional to area of cross section of conductor.
• DDirectly proportional to applied electric field

Question 3

If the temperature of a material is increased by 10⁰C and relative change in resistivity is noted as , what is the temperature coefficient of resistivity?

• A /K
• B/K.
• Cohm/K
• Dohm/K

Question 4

In a farm in order to provide water to the fields a farmer uses an electric motor that draws 120 A of current while operating at 240 V. What will be the power of this motor?

• A28.8 W
• B57.6 W
• C28.8 kW
• D57.6 kW

Question 5

Which of the following is true?

• ADrift velocity is directly proportional to charge density of electrons.
• BThe direction of drift is opposite to the direction of electric field for electrons.
• CThere is some flow of drift current in absence of electric field as well.
• DIf a wire is elongated its resistivity may increase or decrease depending upon the extent of elongation.

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