Download App

Current Electricity — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity1 Mark
Question
12 cells each having same emf are connected in series with some cells wrongly connected. The arrangement is connected in series with an ammeter and two cells which are in series. Current is 3 A when cells and battery aid each other and is 2 A when cells and battery oppose each other. The number of cells wrongly connected is(a) 4 (b) 1(c) 3  (d) 2
       
✓

Answer

(b) 1

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 "M.C.Q (1 Marks)" from Current Electricity→Current Electricity — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

An electric current i enters and leaves a uniform circular wire of radius a through diametrically opposite points. A charged particle q moving along the axis of the circular wire passes through its centre at speed v. The magnetic force acting on the particle when it passes through the centre has a magnitude:
→
A small coil of $N$ turns has an effective area $A$ and carries a current $I.$ It is suspended in a horizontal magnetic field  $\overrightarrow{B}$ such that its plane is perpendicular to $\overrightarrow{B}.$ The work done in rotating it by $180^\circ$  about the vertical axis is
→
The magnetic flux linked with a coil is $\phi\leq8\text{t}^2+3\text{t}+5$ Weber. The induced emf in fourth second will be.
→
Particle like behavior of light arises from the fact that each quanta of light has definite ...X... and a fixed value of ...Y.. just like a particle, Here, X and Y refer to?
→
According to de$-$Broglie, the de$-$Broglie wavelength for electron in an orbit of hydrogen atom is $10^{–9} m$. The principle quantum number for this electron is
→
 A man is looking at a small object placed at his near point. Without altering the position of his eye or the object, he puts a simple microscope of magnifying power 5X before his eyes. The angular magnification achieved is:
→
Some equipotential surfaces of the magnetic scalar potential are shown in the figure. Magnetic field at a point in the region is
→
Assertion  : The number of electrons in a P-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature.
Reason      : It is due to law of mass action.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
 
 
 
 
→
For a given temperature difference, which of the following pairs will generate maximum thermo e.m.f.(a) Antimony-bismuth(b) Silver-gold(c) Iron-copper(d) Lead-nickel
       
→
If $m, m_n$ and $m_p$ are the masses of $z^{X^A}$ nucleus, neutron and proton respectively 
→