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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An electric heater of resistance 6 ohm is run for 10 minutes on a 120 volt line. The energy liberated in this period of time is
|
(a) 7.2 |
(b) 14.4 |
(c) 43.2 |
(d) 28.8 |
The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then
|
(a) After deviation it will emerge from the second refracting surface |
|
(b) It is totally reflected on the second surface and emerges out perpendicularly from third surface in air |
|
(c) It is totally reflected from the second and third refracting surfaces and finally emerges out from the first surface |
|
(d) It is totally reflected from all the three sides of prism and never emerges out |
Two straight long conductors AOB and COD are perpendicular to each other and carry currents and
. The magnitude of the magnetic induction at a point P at a distance a from the point O in a direction perpendicular to the plane ACBD is
|
(a) |
(b) |
(c) |
(d) |
In intrinsic semiconductor at room temperature, number of electrons and holes are
|
(a) Equal |
(b) Zero |
(c) Unequal |
(d) Infinite |
The bending of beam of light around corners of obstacles is called
|
(a) Reflection |
(b) Diffraction |
(c) Refraction |
(d) Interference |