- A$3 \vec{F}$
- ✓$-\vec{F}$
- C$-3 \vec{F}$
- D$\overrightarrow{ F }$
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The resistance of an incandescent lamp is
|
(a) Greater when switched off |
|
(b) Smaller when switched on |
|
(c) Greater when switched on |
|
(d) The same whether it is switched off or switched on |

and
ions are projected on the photographic plate with same velocity in a mass spectrograph. Which one will strike farthest
|
(a) |
(b) |
(c) |
(d) |
Curie is a unit of
|
(a) Length |
(b) It is not any unit |
(c) Activity |
(d) Atomic number |
A rectangular block of glass ABCD has a refractive index 1.6. A pin is placed midway on the face AB (Fig). When observed from the face AD, the pin shall:

The contribution in the total current flowing through a semiconductor due to electrons and holes are
and
respectively. If the drift velocity of electrons is
times that of holes at this temperature, then the ratio of concentration of electrons and holes is
|
(a) 6 : 5 |
(b) 5 : 6 |
(c) 3 : 2 |
(d) 2 : 3 |
