The equivalent capacitance of three capacitors of capacitance 
and 
are connected in parallel is 12 units and product 
. When the capacitors 
and 
are connected in parallel, the equivalent capacitance is 6 units. Then the capacitance are
|
(a) 2, 3, 7 |
(b) 1.5, 2.5, 8 |
(c) 1, 5, 6 |
(d) 4, 2, 6 |
(d) 4, 2, 6
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A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of combination is
|
(a) – 1.5 D |
(b) – 6.5 D |
(c) + 6.5 D |
(d) + 6.67 D |
A rocket is going towards moon with a speed v. The astronaut in the rocket sends signals of frequency v towards the moon and receives them back on reflection from the moon. What will be the frequency of the signal received by the astronaut (Take v << c)
|
(a) |
(b) |
(c) |
(d) |
In the figure magnetic energy stored in the coil is
|
(a) Zero |
(b) Infinite |
(c) 25 joules |
(d) None of the above |
The potential gradient along the length of a uniform wire is 10 volt/metre. B and C are the two points at 30 cm and 60 cm point on a meter scale fitted along the wire. The potential difference between B and C will be
|
(a) 3 volt |
(b) 0.4 volt |
(c) 7 volt |
(d) 4 volt |
A frictionless dielectric plate S is kept on a frictionless table T. A charged parallel plate capacitance C (of which the plates are frictionless) is kept near it. The plate S is between the plates. When the plate S is left between the plates
|
(a) It will remain stationary on the table |
|
(b) It is pulled by the capacitor and will pass on the other end |
|
(c) It is pulled between the plates and will remain there |
|
(d) All the above statements are false |
A transformer is employed to
|
(a) Obtain a suitable dc voltage |
(b) Convert dc into ac |
|
(c) Obtain a suitable ac voltage |
(d) Convert ac into dc |
