An ionization chamber with parallel conducting plates as anode and cathode has 5 
electrons and the same number of singly-charged positive ions per 
. The electrons are moving at 0.4 m/s. The current density from anode to cathode is 
. The velocity of positive ions moving towards cathode is
|
(a) 0.4 m/s |
(b) 16 m/s |
(c) Zero |
(d) 0.1 m/s |
(d) 0.1 m/s
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The tangent galvanometer, when connected in series with a standard resistance can be used as
|
(a) An ammeter |
(b) A voltmeter |
|
(c) A wattmeter |
(d) Both an ammeter and a voltmeter |
A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in;
The electric potential at a point on the axis of an electric dipole depends on the distance r of the point from the dipole as
|
(a) ∝ |
(b) ∝ |
(c) ∝ r |
(d) ∝ |
$\frac{1}{4}\text{mgR}$
$\frac{1}{2}\text{mgR}$
$\text{mgR}$
$2\text{mgR}$
The points resembling equal potentials are
|
(a) P and Q |
(b) S and Q |
(c) S and R |
(d) P and R |
A nucleus of an element 
emits an a-particle first, a b-particle next and then a gamma photon. The final nucleus formed has an atomic number
|
(a) 200 |
(b) 199 |
(c) 83 |
(d) 198 |
An electric iron draws 5 amp, a TV set draws 3 amp and refrigerator draws 2 amp from a 220 volt main line. The three appliances are connected in parallel. If all the three are operating at the same time, the fuse used may be of
|
(a) 20 amp |
(b) 5 amp |
(c) 15 amp |
(d) 10 amp |
