- Aconvergent
- Bdivergent
- ✓parallel
- Dcannot say
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Magnification of an optical instrument is expressed in:
A ray is reflected in turn by three plain mirrors mutually at right angles to each other. The angle between the incident and the reflected rays is
| (a) 90° | (b) 60° | (c) 180° | (d) None of these |
Equal charges q are placed at the vertices A and B of an equilateral triangle ABC of side a. The magnitude of electric field at the point C is
|
(a) |
(b) |
(c) |
(d) |
The mass equivalent of 931 MeV energy is
|
(a) 1.66 |
(b) 6.02 |
(c) 1.66 |
(d) 6.02 |
Fusion reaction takes place at high temperature because
|
(a) Atoms are ionised at high temperature |
|
(b) Molecules break-up at high temperature |
|
(c) Nuclei break-up at high temperature |
|
(d) Kinetic energy is high enough to overcome repulsion between nuclei |
Cathode rays consist of
|
(a) Photons |
(b) Electrons |
(c) Protons |
(d) α -particles |
Two coils A and B having turns 300 and 600 respectively are placed near each other, on passing a current of 3.0 ampere in A, the flux linked with A is 1.2
and with B it is 9.0
. The mutual inductance of the system is
|
(a) 2 × 10–5 henry |
(b) 3 × 10–5 henry |
(c) 4 × 10–5 henry |
(d) 6 × 10–5 henry |
The bending of beam of light around corners of obstacles is called
|
(a) Reflection |
(b) Diffraction |
(c) Refraction |
(d) Interference |