Magnetic induction is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Both (a) and (b) |
(d) None of the above |
Magnetic induction is a
|
(a) Scalar quantity |
(b) Vector quantity |
(c) Both (a) and (b) |
(d) None of the above |
(b) Vector quantity
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Two heater wires of equal length are first connected in series and then in parallel. The ratio of heat produced in the two cases is
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
Ray optics is valid, when characteristic dimensions are
|
(a) Of the same order as the wavelength of light |
|
(b) Much smaller than the wavelength of light |
|
(c) Of the order of one millimetre |
|
(d) Much larger than the wavelength of light |
As shown in the figure, a very thin sheet of aluminium is placed in between the plates of the condenser. Then the capacity

|
(a) Will increase |
(b) Will decrease |
|
(c) Remains unchanged |
(d) May increase or decrease |
The force between the plates of a parallel plate capacitor of capacitance C and distance of separation of the plates d with a potential difference V between the plates, is
|
(a) |
(b) |
(c) |
(d) |
In the circuit shown in figure, each capacitor has a capacity of 3μF. The equivalent capacity between A and B is

|
(a) |
(b) 3 |
(c) 6 |
(d) 5 |
A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is seconds. One of the magnets is removed and if the other magnet oscillates in the same field, then the time period in seconds is
|
(a) |
(b) |
(c) 2 |
(d) |
Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is
|
(a) 10W |
(b) 5W |
(c) 20W |
(d) None of these |