The capacitor of capacitance 4 μF and 6 μF are connected in series. A potential difference of 500 volts is applied to the outer plates of the two capacitor system. The potential difference across the plates of capacitor of 4 μF capacitance is
|
(a) 500 volts |
(b) 300 volts |
(c) 200 volts |
(d) 250 volts |
(b) 300 volts
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
If half life of radium is 77 days. Its decay constant in day will be
|
(a) 3 |
(b) |
(c) 1 |
(d) 6 |
A star emitting radiation at a wavelength of 5000 Å is approaching earth with a velocity of 1.5
. The change in wavelength of the radiation as received on the earth, is
|
(a) 25 Å |
(b) Zero |
(c) 100 Å |
(d) 2.5 Å |
The capacitance of a metallic sphere will be 1μF, if its radius is nearly
|
(a) 9 km |
(b) 10 m |
(c) 1.11 m |
(d) 1.11 cm |
An ammeter gives full deflection when a current of 2 amp. flows through it. The resistance of ammeter is 12 ohms. If the same ammeter is to be used for measuring a maximum current of 5 amp., then the ammeter must be connected with a resistance of
|
(a) 8 ohms in series |
(b) 18 ohms in series |
|
(c) 8 ohms in parallel |
(d) 18 ohms in parallel |
The relation between Ip and Vp for a triode is 
, Keeping the grid potential constant at 1V, the value of rp will be
|
(a) 8 kW |
(b) 4 kW |
(c) 2 kW |
(d) 8 kW |
A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointing in the same direction
|
(a) The electron will turn to its right |
|
(b) The electron will turn to its left |
|
(c) The electron velocity will increase in magnitude |
|
(d) The electron velocity will decrease in magnitude |
In transformer, core is made of soft iron to reduce
|
(a) Hysteresis losses |
(b) Eddy current losses |
|
(c) Force opposing electric current |
(d) None of the above |
An electron beam is moving between two parallel plates having electric field 1.125 
. A magnetic field 3 
is also applied so that beam of electrons do not deflect. The velocity of the electron is
|
(a) 4225 m/s |
(b) 3750 m/s |
(c) 2750 m/s |
(d) 3200 m/s |
A voltmeter has resistance of 2000 ohms and it can measure upto 2V. If we want to increase its range to 10 V, then the required resistance in series will be
|
(a) 2000 Ω |
(b) 4000 Ω |
(c) 6000 Ω |
(d) 8000 Ω |
