MCQ
An AC generator is a device which converts:
  • A
    Electrical energy to mechanical energy.
  • B
    Heat energy to electrical energy.
  • C
    Heat energy to light energy.
  • D
    Mechanical energy to electrical energy.

Answer

  1. Mechanical energy to electrical energy.

Explanation:

An AC generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy. Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.

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

Two identical point charges are placed at a separation of d. P is a point on the line joining the charges, at a distance x  from any one charge. The field at P is E, E is plotted against x for values of x from close to zero to slightly less than d. Which of the following represents the resulting curve

(a)

(b)

(c)

(d)

Consider a capacitor-charging circuit. Let Q1 be the charge given to the capacitor in a time interval of 10ms and Q2 be the charge given in the next time interval of 10ms. Let 10mC charge be deposited in time interval t1 and another 10mC charge be deposited in the next time interval t2.
  1. Q1 > Q2, t1 > t2
  2. Q1 > Q2, t1 < t2
  3. Q1 < Q2, t1 > t2
  4. Q1 < Q2, t1 < t2

In good conductors of electricity, the type of bonding that exists is

(a) Ionic  

(b) Vander Waals

(c) Covalent

(d) Metallic

How many NAND gates are used to form an AND gate

(a) 1 

(b) 2

(c) 3  

(d) 4

A thick wire is stretched so that its length become two times. Assuming that there is no change in its density, then what is the ratio of change in resistance of wire to the initial resistance of wire

(a) 2 : 1

(b) 4 : 1

(c) 3 : 1

(d) 1 : 4

A bar magnet is of length (size) $l$. The ratio of its equatorial field and axial field for the same distance $r$ (where $r >> l$) is __________ .

Assertion :   Photosensitivity of a metal is high if its work function is small.

Reason     : Work function =   where   is the threshold frequency.

(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.

A biconvex lens of glass having refractive index 1.47 is immersed in a liquid. It becomes invisible and behaves as a plane glass plate. The refractive index of the liquid is:

Two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
Assertion (A): Magnetic moment is measured in joule/ tesla or amp m2. Reason (R): Joule/ tesla is equivalent to amp m2.

The electric field due to a dipole at a distance r  on its axis is

(a) Directly proportional to  

(b) Inversely proportional to  

(c) Directly proportional to  

(d) Inversely proportional to