Explanation:
In circuit 1, one diode is forward biassed and the other diode is reverse biassed. The forward-biassed diode offers zero resistance (ideally) to the current flow, so it can be replaced by a short circuit. The voltage drop across the first diode will be zero. The second diode is reverse biassed, so it can be replaced by an open circuit; hence, the voltage drop across this diode will be maximum.
In circuit 2, both the diodes are forward biassed, so they can be replaced by short circuits; hence, the voltage drop across both of them will be minimum and equal.
In circuit 3, both the diodes are reverse biassed, so both can be replaced by open circuits; hence, the voltage drop across both of them will be maximum and equal.
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The time period of a freely suspended magnet is 2 sec. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be
| (a) 4 sec | (b) 2 sec |
(c) 
|
(d) 1 sec |
A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV, its kinetic energy will be
|
(a) 1840 keV |
(b) 1/1840 keV |
(c) 1 keV |
(d) 920 keV |
The decay constant of a radioactive element is 0.01 per second. Its half life period is
|
(a) 693 sec |
(b) 6.93 sec |
(c) 0.693 sec |
(d) 69.3 sec |
$\overrightarrow{\text{F}}.\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}.\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}.\overrightarrow{\text{r}}$
If light travels a distance x in 
sec in air and 10 x distance in 
sec in a medium, the critical angle of the medium will be
|
(a) |
(b) |
(c) |
(d) |
The current from the battery in circuit diagram shown is
|
(a) 1 A |
(b) 2 A |
(c) 1.5 A |
(d) 3 A |
