A narrow beam of white light goes through a slab having parallel faces.
Explanation:
White light will split into different colours inside the glass slab because the value of refractive index is different for different wavelengths of light; thus, they suffer different deviations. But the emergent light will be white light. As the faces of the glass slide are parallel, the emerging lights of different wavelengths will reunite after refraction.
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A galvanometer whose resistance is 120 Ω gives full scale deflection with a current of 0.05 A so that it can read a maximum current of 10 A. A shunt resistance is added in parallel with it. The resistance of the ammeter so formed is
|
(a) 0.06 Ω |
(b) 0.006 Ω |
(c) 0.6 Ω |
(d) 6 Ω s |
On an electric heater 220 volt and 1100 watt are marked. On using it for 4 hours, the energy consumed in kWh will be
|
(a) 2 |
(b) 4.4 |
(c) 6 |
(d) 8 |
Two infinite plane parallel sheets separated by a distance d have equal and opposite uniform charge densities σ. Electric field at a point between the sheets is
|
(a) Zero |
(b) |
|
(c) |
(d) Depends upon the location of the point |
A point source of electromagnetic radiation has an average power output of 800 W. The maximum value of electric field at a distance 4.0 m from the source is
|
(a) 64.7 V/m |
(b) 57.8 V/m |
(c) 56.72 V/m |
(d) 54.77 V/m |
A step up transformer connected to a 220 V AC line is to supply 22 kV for a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 mA. The turn ratio of the transformer is
|
(a) 50 |
(b) 100 |
(c) 150 |
(d) 200 |
A particle of mass M at rest decays into two particles of masses m1 and m2, having non-zero velocities. The ratio of the de-Broglie wavelengths of the particles, 
is
|
(a) |
(b) |
(c) 1.0 |
(d) |
Two metallic charged spheres whose radii are 20 cm and 10 cm respectively, have each 150 micro - coulomb positive charge. The common potential after they are connected by a conducting wire is
|
(a) 9 × |
(b) 4.5 × |
(c) 1.8 × |
(d) 13.5 × |
