How should people wearing spectacles work with a microscope?
Explanation:
If operators using a microscope usually wear spectacles (glasses) for activities such as working at their PC, they often need to remove them when looking through a microscope so they can align their eyes correctly with the eyepieces.
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In the given figure each plate of capacitance C has partial value of charge
|
(a) CE |
(b) |
(c) |
(d) |
Temperature above which a ferromagnetic substance becomes paramagnetic is called
| (a) Critical temperature | (b) Boyle's temperature |
| (c) Debye's temperature | (d) Curie temperature |
The equivalent resistance between the points P and Q in the network given here is equal to (given r = 
)
|
(a) |
(b) 1 W |
(c) |
(d) 2 W |
In Thomson's experiment if the value of q/m is the same for all positive ions striking the photographic plate, then the trace would be
|
(a) Straight line |
(b) Parabolic |
(c) Circular |
(d) Elliptical |
The line on the earth's surface joining the points where the field is horizontal is
| (a) Magnetic meridian | (b) Magnetic axis | (c) Magnetic line | (d) Magnetic equator |
Biaxial crystal among the following is
|
(a) Calcite |
(b) Quartz |
(c) Selenite |
(d) Tourmaline |
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region
|
(a) Is zero |
(b) Decreases as |
(c) Increases as r |
(d) Decreases as |
The emf of a battery is 2 V and its internal resistance is 0.5 W. The maximum power which it can deliver to any external circuit will be
|
(a) 8 Watt |
(b) 4 Watt |
(c) 2 Watt |
(d) None of the above |
A ray of light propagates from glass (refractive index = 3/2) to water (refractive index = 4/3). The value of the critical angle
|
(a) sin–1(1/2) |
(b) |
(c) |
(d) |
