A biconvex lens forms a real image of an object placed perpendicular to its principal axis. Suppose the radii of curvature of the lens tend to infinity. Then the image would
|
(a) Disappear |
|
(b) Remain as real image still |
|
(c) Be virtual and of the same size as the object |
|
(d) Suffer from aberrations |
(c) Be virtual and of the same size as the object
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In the following circuit, 5W resistor develops 45 J/s due to current flowing through it. The power developed per second across 12 W resistor is
|
(a) 16 W |
(b) 192 W |
(c) 36 W |
(d) 64 W |
The splitting of line into groups under the effect of electric or magnetic field is called
|
(a) Zeeman's effect |
(b) Bohr's effect |
|
(c) Heisenberg's effect |
(d) Magnetic effect |
Two metal spheres of capacitance 
and 
carry some charges. They are put in contact and then separated. The final charges 
and 
on them will satisfy
|
(a) |
(b) |
(c) |
(d) |
The equivalent resistance of the arrangement of resistances shown in adjoining figure between the points A and B is
|
(a) 6 ohm |
(b) 8 ohm |
(c) 16 ohm |
(d) 24 ohm |
The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that
|
(a) Sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectively |
|
(b) Sample X is undoped while both samples Y and Z have been doped with a fifth group impurity |
|
(c) Sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undoped |
|
(d) Sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively |
A double convex thin lens made of glass of refractive index 1.6 has radii of curvature 15 cm each. The focal length of this lens when immersed in a liquid of refractive index 1.63 is
|
(a) – 407 cm |
(b) 250 cm |
(c) 125 cm |
(d) 25 cm |
The current flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will
|
(a) Increase |
(b) Decrease |
|
(c) Remain unchanged |
(d) The information is incomplete |
