- AForms any closed loops.
- BDo not form any closed loops.
- CBoth a and b.
- DNone.
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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 |
Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is
|
(a) 4 |
(b) |
(c) 2 |
(d) |
In forward bias, the width of potential barrier in a P-N junction diode
| (a) Increases | (b) Decreases |
| (c) Remains constant | (d) First increases then decreases |
The instrument that is based on the principle that when an object is placed between first principal focus and the optic centre of convex lens, an upright, virtual and enlarged image on the same side of the object is formed, is:
Resistance of tungsten wire at 150℃ is 133 Ω . Its resistance temperature coefficient is 0.0045/℃. The resistance of this wire at 500 ℃ will be
|
(a) 180 Ω |
(b) 225 Ω |
(c) 258 Ω |
(d) 317 Ω |
Nuclear fission experiments show that the neutrons split the uranium nuclei into two fragments of about same size. This process is accompanied by the emission of several
|
(a) Protons and positrons |
(b) a - particles |
|
(c) Neutrons |
(d) Protons and a-particles |