Download App

Heating and Chemical Effect of Current — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsHeating and Chemical Effect of Current1 Mark
MCQ
Electric power is transmitted over long distances through conducting wires at high voltage because
  • A
    High voltage travels faster
  • B
    Power loss is large
  • ✓
    Power loss is less
  • D
    Generator produced electrical energy at a very high voltage A coil develops heat of $800 cal / sec$. When $20 volts$ is applied across its ends. The resistance of the coil is $(1 cal =4.2$ joule $)$
✓

Answer

Correct option: C.
Power loss is less
(c) Power loss in transmission $P_L=\frac{P^2 R}{V^2} \Rightarrow P_L \propto \frac{1}{V^2}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Heating and Chemical Effect of Current→Heating and Chemical Effect of Current — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

$X-$rays of which of the following wavelengths are hardest
→
A uniform, constant magnetic field $\vec B$ is directed at an angle of $45^o$ to the $x-$ axis in the $xy-$ plane, $PQRS$ is a rigid square wire frame carrying a steady current $I_0,$ with its centre at the origin $O.$ At time $t = 0,$ the frame is at rest in the position shown in the figure, with its sides parallel to the $x$ and $y$ axis. Each side of the frame is of mass $M$ and Length $L$
→
Inertia is that property of a body by virtue of which the body is
→
A cyclist taking turn bends inwards while a car passenger taking same turn is thrown outwards. The reason is
→
The block of mass $M$ moving on the frictionless horizontal surface collides with the spring of spring constant $K$ and compresses it by length $L$. The maximum momentum of the block after collision is
Image
→
An object of height $1.5 \mathrm{~cm}$ is placed on the axis of a convex lens of focal length $25 \mathrm{~cm}$. A real image is formed at a distance of $75 \mathrm{~cm}$ from the lens. The size of the image will be
→
A particle of charge $+q$ and mass $m$ moving under the influence of a uniform electric field $E\hat i$ and a uniform magnetic field $B\hat k$ follows trajectory from $P$ to $Q$ as shown in figure. The velocities at $P$ and $Q$ are $v\hat i$ and $ - 2v\hat j$ respectively. Which of the following statement(s) is/are correct
→
The number of turns in the primary coil of a transformer is $200$ and the number of turns in the secondary coil is $10.$ If $240\  \mathrm{volt} \ AC$ is applied to the primary, the output from the secondary will be
→
The angle of projection at which the horizontal range and maximum height of projectile are equal is
→
A block weighs $W$ is held against a vertical wall by applying a horizontal force $F$. The minimum value of $F$ needed to hold the block is
→