MCQ
The working of dynamo is based on principle of
- ✓Electromagnetic induction
- BConversion of energy into electricity
- CMagnetic effects of current
- DHeating effects of current
✓
Answer
Correct option: A.
Electromagnetic induction
a
(a)Rotation of magnet in the dynamo creates the variable flux which in turn produces the induced current.
(a)Rotation of magnet in the dynamo creates the variable flux which in turn produces the induced current.
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
Figure shows three resistor configurations $R_1,R_2$ and $R_3$ connected to $3\,V$ battery. If the power dissipated by the configuration $R_1, R_2$ and $R_3$ is $P_1, P_2$ and $P_3$ , respectively then
→If momentum of a body is increased by $20 \%$, then its kinetic energy increases by$....\%$
→When the temperature of a rod increases from $t$ to $\left( {t + \Delta t} \right)$, its moment of inertia increases from $I$ to $\left( {I + \Delta I} \right)$. If $\alpha $ be the coefficient of linear expansion of the rod, then the value of $\left( {\frac{{\Delta I}}{I}} \right)$ is
→The acceleration-time graph for a particle moving along $x$-axis is shown in figure. If the initial velocity of particle is $-5 \,m / s$, the velocity at $t=8 \,s$ is ....... $m / s$
→If a particle of mass $m$ is moving in a horizontal circle of radius $r$ with a centripetal force $( - k/{r^2})$, the total energy is
→The mean free path of electrons in a metal is $4 \times 10^{-8} \;m$. The electric field which can give on an average $2 \;eV$ energy to an electron in the metal will be in units of $V / m$
→A standing wave is represented by
→$Y = A\sin (100t)\cos (0.01x)$
where $Y$ and $A$ are in millimetre, $t$ is in seconds and $x$ is in metre. The velocity of wave is ..... $m/s$
Two bodies $A$ & $B$ rotate about an axis, such that angle $\theta_A$ (in radians) covered by first body is proportional to square of time, & $\theta_B$ (in radians) covered by second body varies linearly. At $t = 0, \theta \,A = \theta \,B = 0$. If $A$ completes its first revolution in $\sqrt \pi$ sec. & $B$ needs $4\pi \,sec$. to complete half revolution then; angular velocity $\omega_A : \omega_B$ at $t = 5\, sec$. are in the ratio
→The maximum vertical height to which a man can throw a ball is $136\,m$. The maximum horizontal distance upto which he can throw the same ball is $.....\,m$
→Excess pressure of one soap bubble is four times more than the other. Then the ratio of volume of first bubble to another one is