MCQ
A source of electromotive force $(emf) $ is a:
- ACell
- BBattery
- CGenerator
- ✓All of these
✓
Answer
Correct option: D.
All of these
A source of $\text{EMF}$ can be cell, battery or generator.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Ionic molecules are:
A hollow insulated conducting sphere is given a positive charge of $10\,\mu \,C$. ........$\mu \,C{m^{ - 2}}$ will be the electric field at the centre of the sphere if its radius is $2$ meters
→The graph shows the $\log$ of activity $\log R$ of a radioactive material as a function of time $t$ in minutes.The half-life (in minute) for the decay is closest to
→When light travels from glass to air, the incident angle is ${\theta _1}$ and the refracted angle is ${\theta _2}$. The true relation is
→The diode used at a constant potential drop of $0.5\, V$ at all currents and maximum power rating of $100\, mW$. What resistance must be connected in series diode, so that current in circuit is maximum ? (in $\Omega$)
→Mosley measured the frequency $(f)$ of the characteristic $X-$ rays from many metals of different atomic number $(Z)$ and represented his results by a relation known as Mosley's law. This law is ($a, b$ are constants)
→In Thomson's method of determining $e/m$ of electrons
→The solids which have the negative temperature coefficient of resistance are :
Two positively charged spheres of masses $m_1$ and $m_2$ are suspended from a common point at the ceiling by identical insulating massless strings of length $l$. Charges on the two spheres are $q_1$ and $q_2$, respectively. At equilibrium, both strings make the same angle $\theta$ with the vertical. Then
→The thermionic emission of electron is due to