Which of the following is vector quantity
|
(a) Current density |
(b) Current |
(c) Wattless current |
(d) Power |
Which of the following is vector quantity
|
(a) Current density |
(b) Current |
(c) Wattless current |
(d) Power |
(a) Current density
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The amplification factor of a triode valve is 15. If the grid voltage is changed by 0.3 volt the change in plate voltage in order to keep the plate current constant (in volt) is
|
(a) 0.02 |
(b) 0.002 |
(c) 4.5 |
(d) 5.0 |
A P-type semiconductor can be obtained by adding
|
(a) Arsenic to pure silicon |
(b) Gallium to pure silicon |
|
(c) Antimony to pure germanium |
(d) Phosphorous to pure germanium |
The bending of light as it passes from one medium into another is commonly known as:
In the figure magnetic energy stored in the coil is

|
(a) Zero |
(b) Infinite |
(c) 25 joules |
(d) None of the above |
The shortest wavelength of X-rays emitted from an X-ray tube depends on the
|
(a) Current in the tube |
(b) Voltage applied to the tube |
|
(c) Nature of gas in the tube |
(d) Atomic number of target material |
Two capacitors each of 1μF capacitance are connected in parallel and are then charged by 200 volts d.c. supply. The total energy of their charges (in joules) is
|
(a) 0.01 |
(b) 0.02 |
(c) 0.04 |
(d) 0.06 |