- ✓$M^0 L^0 T ^0 A^0$
- B$M ^0 L^{-1} T^{-1} A^{-2}$
- C$M ^0 L^1 T^0 A^0$
- D$M ^1 L^{-1}T^0 A^{-2}$
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In a Young's double slit experiment, the central point on the screen is
|
(a) Bright |
(b) Dark |
|
(c) First bright and then dark |
(d) First dark and then bright |
A nucleus of atomic mass A and atomic number Z emits β - particles. The atomic mass and atomic number of the resulting nucleus are
|
(a) A, Z |
(b) A + 1, Z |
(c) A, Z + 1 |
(d) A – 4, Z - 2 |
The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an ac supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are
|
(a) 240 V, 5 A |
(b) 240 V, 10 A |
(c) 60 V, 20 A |
(d) 120 V, 20 A |
The angle of polarisation for any medium is 60o, what will be critical angle for this
|
(a) |
(b) |
(c) |
(d) |
In the figure shown there are two semicircles of radii and
in which a current i is flowing. The magnetic induction at the centre O will be
|
(a) |
(b) |
(c) |
(d) |
The plate current in a triode is given by
where Ip, Vp and Vg are the values of plate current, plate voltage and grid voltage, respectively. What are the triode parameters m, rp and gm for the operating point at
and
?
|
(a) 10, 16.7 kW, 0.6 m mho |
(b) 15, 16.7 kW, 0.06 m mho |
|
(c) 20, 6 kW, 16.7 m mho |
(d) None of these |
A light bulb is placed between two plane mirrors inclined at an angle of 60°. The number of images formed are
| (a) 6 | (b) 2 | (c) 5 | (d) 4 |
An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm The size of the image is
|
(a) 9.2 cm |
(b) 10.5 cm |
(c) 5.6 cm |
(d) 7.5 cm |