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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY
1
Medium
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Analyzing
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A student in a town in India, where the price per
unit (1 unit = 1 kW-h) of electricity is `5.00,
purchases a 1 kVA UPS (uninterrupted power
supply) battery. A day before the exam, 10
friends arrive to the student’s home with their
laptops and all connect their laptops to the UPS.
Assume that each laptop has a constant power
requirement of 90 W. Consider the following
statements
I. All the 10 laptops can be powered by the
UPS if connected directly.
II. All the 10 laptops can be powered if
connected using an extension box with a
3A fuse.
III. If all the 10 friends use the laptop for 5 hours,
then the cost of the consumed electricity is
about `22.50.
Select the correct option with the true
statements.
unit (1 unit = 1 kW-h) of electricity is `5.00,
purchases a 1 kVA UPS (uninterrupted power
supply) battery. A day before the exam, 10
friends arrive to the student’s home with their
laptops and all connect their laptops to the UPS.
Assume that each laptop has a constant power
requirement of 90 W. Consider the following
statements
I. All the 10 laptops can be powered by the
UPS if connected directly.
II. All the 10 laptops can be powered if
connected using an extension box with a
3A fuse.
III. If all the 10 friends use the laptop for 5 hours,
then the cost of the consumed electricity is
about `22.50.
Select the correct option with the true
statements.
View answer and explanation
Correct option: C
I and III only
Option C (I and III only) is correct because the UPS can power the laptops directly, and the cost of electricity consumed can be calculated based on the power usage and time.
More Questions from CURRENT ELECTRICITY
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In the absence of applied potential, the electric current flowing through a metallic wire is zero because
A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature is
In a thermocouple, which of the following statements is not true
(A) The drift velocity of electrons decreases with the increase in the temperature of conductor.
(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.
(C) The drift velocity does not depend on the applied potential difference to the conductor.
(D) The drift velocity of electron is inversely proportional to the length of the conductor.
(E) The drift velocity increases with the increase in the temperature of conductor.
Choose the correct answer from the options given below The mass of ions deposited during a given interval of time in the process of electrolysis depends on The steady current flows in a metallic conductor of non-uniform cross-section. The constant along the length of the conductor
(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.
(C) The drift velocity does not depend on the applied potential difference to the conductor.
(D) The drift velocity of electron is inversely proportional to the length of the conductor.
(E) The drift velocity increases with the increase in the temperature of conductor.
Choose the correct answer from the options given below The mass of ions deposited during a given interval of time in the process of electrolysis depends on The steady current flows in a metallic conductor of non-uniform cross-section. The constant along the length of the conductor