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
The motion of planets in the solar system is an example of the conservation of
The figure shows a velocity-time graph of a particle moving along a straight line Identify the region in which the rate of change of velocity $\left| {\frac{{\Delta \vec v}}{{\Delta t}}} \right|$ of the particle is maximum
→Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Emission of electrons in photoelectric effect can be suppressed by applying a sufficiently negative electron potential to the photoemissive substance.
Reason (R): A negative electric potential, which stops the emission of electrons from the surface of a photoemissive substance, varies linearly with frequency of incident radiation.
In the light of the above statements, choose the most appropriate answer from the options given below:
Assertion (A) : Emission of electrons in photoelectric effect can be suppressed by applying a sufficiently negative electron potential to the photoemissive substance.
Reason (R): A negative electric potential, which stops the emission of electrons from the surface of a photoemissive substance, varies linearly with frequency of incident radiation.
In the light of the above statements, choose the most appropriate answer from the options given below:
$A$ ball whose size is slightly smaller than width of the tube of radius $2.5 \,m$ is projected from bottommost point of a smooth tube fixed in a vertical plane with velocity of $10\, m/s$. If $N_1$ and $N_2$ are the normal reactions exerted by inner side and outer side of the tube on the ball
→A mass $m = 8\,kg$ is attahced to a spring as shown in figure and held in position so that the spring remains unstretched. The spring constant is $200\,N/m$. The mass $m$ is then released and begins to undergo small oscillations. The maximum velocity of the mass will be ..... $m/s$ $(g = 10\,m/s^2)$
→By which curve will the variation of gravitational potential of a hollow sphere of radius $R$ with distance be depicted
→A book is resting on a shelf that is undergoing vertical simple harmonic oscillations with an amplitude of $2.5 \,cm$. What is the minimum frequency of oscillation of the shelf for .......... $Hz$ the book will lose contact with the shelf? (Assume that, $g=10 \,ms ^{-2}$ )
→A uniformly charged disc of radius $R$ having surface charge density $\sigma$ is placed in the ${xy}$ plane with its center at the origin. Find the electric field intensity along the $z$-axis at a distance $Z$ from origin :-
→A deviation of $2^{\circ}$ is produced in the yellow ray when prism of crown and flint glass are achromatically combined. Taking dispersive powers of crown and flint glass are $0.02$ and $0.03$ respectively and refractive index for yellow light for these glasses are $1.5$ and $1.6$ respectively. The refracting angles for crown glass prism will be $........\,^{\circ}$ (in degree) (Round off to the Nearest Integer)
→A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat $Q$ in time $t$. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the new rod, when placed in thermal contact with the two reservoirs in time $t$ ?
→