What is a virtual image?
- AThe image that cannot be caught on a screen.
- BThe image that can be caught on a screen.
- CThe image that cannot be converged on a screen.
- DNone
What is a virtual image?
Explanation:
When the actual rays diverge then they can never meet to form an image. Therefore the rays are assumed to meet in the backward direction of their propagation.
As the imaginary light rays meet and form the image, therefore the image can not be caught on a screen.
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Which curve may best represent the current deflection in a tangent galvanometer

|
(a) A |
(b) B |
(c) C |
(d) D |
A radioactive nucleus emits a beta particle. The parent and daughter nuclei are
|
(a) Isotopes |
(b) Isotones |
(c) Isomers |
(d) Isobars |
The plate characteristic curve of a diode in space charge limited region is as shown in the figure. The slope of curve at point P is 5.0 mA/V. The static plate resistance of diode will be
| (a) 111.1W | (b) 222.2W | (c) 333.3W | (d) 444.4W |
A proton and an alpha particle are separately projected in a region where a uniform magnetic field exists. Their initial velocities are perpendicular to direction of magnetic field. If both the particles move around magnetic field in circles of equal radii, the ratio of momentum of proton to alpha particle
is
|
(a) 1 |
(b) |
(c) 2 |
(d) |
Light waves can be polarised as they are
|
(a) Transverse |
(b) Of high frequency |
(c) Longitudinal |
(d) Reflected |
The focal length of a convex lens is 10 cm and its refractive index is 1.5. If the radius of curvature of one surface is 7.5 cm, the radius of curvature of the second surface will be
|
(a) 7.5 cm |
(b) 15.0 cm |
(c) 75 cm |
(d) 5.0 cm |
An electron of mass initially at rest moves through a certain distance in a uniform electric field in time
. A proton of mass
also initially at rest takes time
to move through an equal distance in this uniform electric field. Neglecting the effect of gravity, the ratio of
is nearly equal to
|
(a) 1 |
(b) |
(c) |
(d) 1836 |