An electron microscope is superior to an optical microscope in
|
(a) Having better resolving power |
(b) Being easy to handle |
|
(c) Low cost |
(d) Quickness of observation |
(a) Having better resolving power
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The resistance of a wire is 20 ohms. It is so stretched that the length becomes three times, then the new resistance of the wire will be
|
(a) 6.67 ohms |
(b) 60.0 ohms |
(c) 120 ohms |
(d) 180.0 ohms |
What is the area of the plates of a 3F parallel plate capacitor, if the separation between the plates is 5mm
|
(a) 1.694 |
(b) 4.529 |
(c) 9.281 |
(d) 12.981 |
Radio wave diffract around building although light waves do not. The reason is that radio waves
|
(a) Travel with speed larger than c |
(b) Have much larger wavelength than light |
|
(c) Carry news |
(d) Are not electromagnetic waves |
At ordinary temperatures, the electrical conductivity of semi conductors in mho/meter is in the range
|
(a) |
(b) |
(c) |
(d) |
A radioactive material has an initial amount 16gm. After 120 days it reduces to 1gm, then the half-life of radioactive material is
|
(a) 60 days |
(b) 30 days |
(c) 40 days |
(d) 240 days |
The equivalent resistance between the points P and Q of the circuit given is
|
(a) |
(b) |
(c) 4 R |
(d) 2 R |
If a resistance 
is connected in parallel with the resistance R in the circuit shown, then possible value of current through R and the possible value of will be
|
(a) |
(b) I, 2R |
(c) |
(d) |
Astigmatism (for a human eye) can be removed by using
|
(a) Concave lens |
(b) Convex lens |
(c) Cylindrical lens |
(d) Prismatic lens |
