- AStrong electrical repulsion
- BStrong electric attraction
- ✓Strong force of attraction
- DLike Van der Waals forces
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Consider a radioactive material of half-life 1.0 minute. If one of the nuclei decays now, the next one will decay
|
(a) After 1 minute |
|
(b) After |
|
(c) After |
|
(d) After any time |
In the following diagram if V2 > V1 then

|
(a) |
(b) |
(c) |
(d) |
A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror he is using
|
(a) Plane mirror |
(b) Convex mirror |
(c) Concave mirror |
(d) None of these |
The clear sky appears blue because:
Energy of photon whose frequency is
, will be
|
(a) 4.14 |
(b) 4.14 |
(c) 4.14 |
(d) 4.14 |
If
undergoes successively 8 a-decays and 6 b-decays, then resulting nucleus is
|
(a) |
(b) |
(c) |
(d) |