Image formed by a convex mirror is
|
(a) Virtual |
(b) Real |
(c) Enlarged |
(d) Inverted |
Image formed by a convex mirror is
|
(a) Virtual |
(b) Real |
(c) Enlarged |
(d) Inverted |
(a) Virtual
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The critical angle of a material is the angle of incidence for which the angle of refraction is:
A piece of semiconductor is connected in series in an electric circuit. On increasing the temperature, the current in the circuit will
| (a) Decrease | (b) Remain unchanged | (c) Increase | (d) Stop flowing |
Which of the following statement is true
|
(a) The presence of a large magnetic flux through a coil maintains a current in the coil if the circuit is continuous |
|
(b) A coil of a metal wire kept stationary in a non-uniform magnetic field has an e.m.f. induced in it |
|
(c) A charged particle enters a region of uniform magnetic field at an angle of 85° to the magnetic lines of force;the path of the particle is a circle |
|
(d) There is no change in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it |
Which of the following wavelength falls in X-ray region
|
(a) 10000 Å |
(b) 1000 Å |
(c) 1 Å |
(d) 10–2 Å |
An electron, a proton, a deuteron and an alpha particle, each having the same speed are in a region of constant magnetic field perpendicular to the direction of the velocities of the particles. The radius of the circular orbits of these particles are respectively Re, Rp, Rd and Ra. It follows that
|
(a) |
(b) |
(c) |
(d) |