MCQ
The working of dynamo is based on principle of
  • Electromagnetic induction
  • B
    Conversion of energy into electricity
  • C
    Magnetic effects of current
  • D
    Heating 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.

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

Similar questions

Light of frequency $8 \times 10^{15} \mathrm{~Hz}$ is incident on a substance of photoelectric work function 6.125eV. The maximum kinetic energy of the emitted photoelectrons is
The relation between the number of free electrons in semiconductors (n) and its temperature (T) is
A point source of light is placed in front of a plane mirror:
A loop of irregular shape carrying current is located in an external magnetic field. If  wire is flexible it will take the shape of
In the following circuit a 10 m long potentiometer wire with resistance 1.2 ohm/m, a resistance $R_1$ and an accumulator of emf 2 V are connected in series. When the emf of thermocouple is 2.4 mV then the deflection in galvanometer is zero. The current supplied by the accumulator will be
The threshold frequency of a photoelectric metal is $\nu_0$. If light of frequency $4\nu_0$ is incident on this metal, then the maximum kinetic energy of emitted electrons will be $.......h\nu_0$
A $0.07\,{H}$ inductor and a $12 \,\Omega$ resistor are connected in series to a $220 \,{V}, 50 \,{Hz}$ ac source. The approximate current in the circuit and the phase angle between current and source voltage are respectively. [Take $\pi$ as $\left.\frac{22}{7}\right]$
From the circuit of the following Logic gates, the basic logic gate obtained is
The magnifying power of an astronomical telescope in the normal adjustment position is $100$. The distance between the objective and the eye piece is $101 \,cm$. Find the focal  length of the objective lens.....$cm$
A moving charge will gain energy due to the application of