Question

Emf is most closely related to

(a) Mechanical force

(b) Potential difference

(c) Electric field

(d) Magnetic field

Answer

(b) Potential difference

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

The magnitude of gravitational potential energy of the moon-earth system is U with zero potential energy at infinite separation. The kinetic energy of the moon with respect to the earth is K.
  1. U < K
  2. U > K
  3. U = K

The chromatic Aberration in lenses becomes due to

(a) Disimilarity of main axis of rays

(b) Disimilarity of radii of curvature

(c) Variation of focal length of lenses with wavelength

(d) None of these

Assertion :   The energy (E) and momentum (p) of a photon are related by p = E/c.

Reason     :  The photon behaves like a particle.

(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.

Two light waves of intensities I and 4I, makes fringes by interference. The phase difference between the waves at point A of the screen is $\pi / 2$ and at point B is $\pi$. Then at point A and B the difference between the resulting intensities is :
When two bulbs of power $ 60~W $ and $ 40~W $ are connected in series, then the power of their combination will be :
Unit of pole strength is :

Two thin lenses of focal lengths f1 and f2 are in contact.  The focal length of this combination is

(a)   

(b)

(c)   

(d)

The process in which a region is made free from any electric field is known as _____________.

Newton postulated his corpuscular theory on the basis of

(a) Newton’s rings

(b) Colours of thin films

(c) Rectilinear propagation of light

(d) Dispersion of white light

In a double slit arrangement fringes are produced using light of wavelength 4800 Å. One slit is covered by a thin plate of glass of refractive index 1.4 and the other with another glass plate of same thickness but of refractive index 1.7. By doing so the central bright shifts to original fifth bright fringe from centre. Thickness of glass plate is

(a) 8 m

(b) 6 mm

(c) 4 m

(d) 10 mm