n equal resistors are first connected in series and then connected in parallel. What is the ratio of the maximum to the minimum resistance
|
(a) n |
(b) |
(c) |
(d) |
(c) 
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For a transistor, the current amplification factor is 0.8. The transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA is
|
(a) 6 mA |
(b) 4.8 mA |
(c) 24 mA |
(d) 8 mA |
The time period of a freely suspended magnet is 4 seconds. 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) 0.5 sec | (d) 0.25 sec |
The resistance 
of a conductor varies with temperature t as shown in the figure. If the variation is represented by = 
, then
|
(a) α and β are both negative |
(b) α and β are both positive |
|
(c) α is positive and β is negative |
(d) α is negative and β are positive |
A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by (Given Planck constant h = 6.6 
J - sec)
|
(a) 1.05 |
(b) 3.16 |
(c) 2.11 |
(d) 4.22 |
$\lambda\geq\lambda_0$
$\lambda\geq2\lambda_0$
$\lambda\leq\lambda_0$
$\lambda<\frac{\lambda_ 0}{2}.$
The energy required to charge a capacitor of 5μF by connecting a d.c. source of 20 kV is
|
(a) 10 kJ |
(b) 5 kJ |
(c) 2 kJ |
(d) 1 kJ |
Before the saturation state of a diode at the plate voltages of 400 V and 200 V respectively the currents are i1 and i2 respectively. The ratio i1/i2 will be
(a) 
|
(b) 2
|
(c) 2 | (d) 1/2 |
