
- ATowards left.
- BTowards right.
- CUpward.
- DZero.

Explanation:

Electric field due to Q & q, inside the spherical shell is zero.
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2μF capacitance has potential difference across its two terminals 200 volts. It is disconnected with battery and then another uncharged capacitance is connected in parallel to it, then P.D. becomes 20 volts. Then the capacity of another capacitance will be
|
(a) 2 μF |
(b) 4 μF |
(c) 18 μF |
(d) 10 μF |
Match the List I with the List II from the combination shown. In the left side (List I) there are four different conditions and in the right side (List II), there are ratios of heat produced in each resistance for each condition :
|
List I |
List II |
||
|
(I) |
Two wires of same resistance are connected in series and same current is passed through them |
(A) |
1 : 2 |
|
(II) |
Two wires of resistance R and 2R ohm are connected in series and same P.D. is applied across them |
(B) |
4 : 1 |
|
(III) |
Two wires of same resistance are connected in parallel and same current is flowing through them |
(C) |
1 : 1 |
|
(IV) |
Two wires of resistances in the ratio 1 : 2 are connected in parallel and same P.D. is applied across them |
(D) |
2 : 1 |
|
(a) I – B; II – A; III – C; IV - D |
(b) I – C; II – D; III – C; IV - D |
|
(c) I – B; II – D; III – A; IV - C |
(d) I – A; II – B; III – D; IV - C |
In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be

|
(a) 3.4 mA |
(b) 2 mA |
(c) 2.5 mA |
(d) 3 mA |
Which of the following graphs shows the variation of thermoelectric power with temperature difference between hot and cold junction in thermocouples
|
(a) |
(b) |
(c) |
(d) |
What determines the hardness of the X-rays obtained from the Coolige tube
|
(a) Current in the filament |
| (b) Pressure of air in the tube |
| (c) Nature of target |
| (d) Potential difference between cathode and target |
We combined a convex lens of focal length f1 and concave lens of focal lengths f2 and their combined focal length was F. The combination of these lenses will behave like a concave lens, if
|
(a) f1 > f2 |
(b) f1 < f2 |
(c) f1 = f2 |
(d) f1 ≤ f2 |