Microscope is an optical instrument which
|
(a) Enlarges the object |
|
(b) Increases the visual angle formed by the object at the eye |
|
(c) Decreases the visual angle formed by the object at the eye |
|
(d) Brings the object nearer |
(b) Increases the visual angle formed by the object at the eye
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Which impurity is doped in Si to form N-type semi-conductor?
|
(a) Al |
(b) B |
(c) As |
(d) None of these |
Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be
|
(a) 13.6 |
(b) 1.8 |
(c) 3.6 |
(d) 1.8 |
If half life of radium is 77 days. Its decay constant in day will be
|
(a) 3 |
(b) |
(c) 1 |
(d) 6 |
A capacitor 4 μF charged to 50 V is connected to another capacitor of 2 μF charged to 100 V with plates of like charges connected together. The total energy before and after connection in multiples of (
is
|
(a) 1.5 and 1.33 |
(b) 1.33 and 1.5 |
(c) 3.0 and 2.67 |
(d) 2.67 and 3.0 |
