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Science · 2023 · 3 marks
CBSE 2023 · Region 4 · Set 1 · Q32
(A)Why is an alternating current (A. C. ) considered to be advantageous over direct current (D. C. ) for the long distance transmission of electric power?(ii)How is the type of current used in household supply different from the one given by a battery of dry cells?(iii)How does an electric fuse prevent the electric circuit and the appliances from a possible damage due to short circuiting or overloading.For the current carrying solenoid as shown, draw magnetic field lines and give reason to explain that out of the three points $\displaystyle \mathrm{A}, \mathrm{B}$ and C, at which point the field strength is maximum and at which point it is minimum?
(A)
Why is an alternating current (A. C. ) considered to be advantageous over direct current (D. C. ) for the long distance transmission of electric power?
(ii)
How is the type of current used in household supply different from the one given by a battery of dry cells?
(iii)
How does an electric fuse prevent the electric circuit and the appliances from a possible damage due to short circuiting or overloading.
For the current carrying solenoid as shown, draw magnetic field lines and give reason to explain that out of the three points $\displaystyle \mathrm{A}, \mathrm{B}$ and C, at which point the field strength is maximum and at which point it is minimum?
Marking-scheme solution
(A) (i) Alternating current can be transmitted over long distances without much loss of electric energy.
(ii) Household supply - Alternating current (AC) Battery of Dry cell - Direct current (DC)
(iii) It melts and breaks the circuit when a current of higher value than its rating flows through it. OR
(B) •
[Deduct \(\displaystyle \frac{\mathbf{1}}{\mathbf{2}}\) mark if direction of current or magnetic field is not marked]Maximum at A Magnetic field lines are crowded. / Magnetic field adds up due to 'n' number of turns of a solenoid.
Minimum at B Magnetic field lines are far apart.
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.