Explanation:
12C and 14C are the two isotopes of carbon atom that have same atomic number, but different mass numbers. This means that they have same number of protons and electrons, but different number of neutrons. Therefore, 12C has 6 protons, 6 electrons and 6 neutrons, whereas 14C has 6 electrons, 6 protons and 8 neutrons.
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For a triode, at 
volt, the following observations were taken
, 
. The value of plate resistance will be
|
(a) 25 kW |
(b) 20.8 kW |
(c) 12.5 kW |
(d) 100 kW |
electrons reach the anode per second. If the power consumed is 448 milliwatts, then the plate (anode) voltage is
|
(a) 150 V |
(b) 200V |
(c) 14 × 448 V |
(d) 448/14V |
A compass needle will show which one of the following directions at the earth's magnetic pole
| (a) Vertical | (b) No particular direction |
| (c) Bent at 45° to the vertical | (d) Horizontal |
In a plano-convex lens the radius of curvature of the convex lens is 10 cm. If the plane side is polished, then the focal length will be (Refractive index = 1.5)
|
(a) 10.5 cm |
(b) 10 cm |
(c) 5.5 cm |
(d) 5 cm |
When the current in a coil changes from 8 ampere to 2 ampere in 3 
second, the e.m.f. induced in the coil is 2 volt. The self inductance of the coil (in millihenry) is
|
(a) 1 |
(b) 5 |
(c) 20 |
(d) 10 |