The smallest temperature difference that can be measured with a combination of a thermocouple of thermo e.m.f. 30mV per degree and a galvanometer of 50 ohm resistance, capable of measuring a minimum current of 3 × 10–7 amp is
|
(a) 0.5 degree |
(b) 1.0 degree |
(c) 1.5 degree |
(d) 2.0 degree |
(a) 0.5 degree
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In a step up transformer, if ratio of turns of primary to secondary is 1 : 10 and primary voltage is 230 V. If the load current is 2A, then the current in primary is
|
(a) 20 A |
(b) 10 A |
(c) 2 A |
(d) 1 A |
An expression for rate of heat generated, if a current of I ampere flows through a resistance of R W, is
|
(a) |
(b) |
(c) |
(d) IR |
Assertion : Mass of ion is slightly differed from its element.
Reason : Ion is formed, when some electrons are removed or added so mass changes.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The ratio of the energy of a photon with 
to that with 
is
|
(a) 2 |
(b) 1/4 |
(c) 4 |
(d) 1/2 |
In Young’s double slit experiment, the distance between the two slits is made half, then the fringe width will become
|
(a) Half |
(b) Double |
(c) One fourth |
(d) Unchanged |
The figure shows a network of currents. The magnitude of currents is shown here. The current I will be
|
(a) 3 A |
(b) 9 A |
(c) 13 A |
(d) 19 A |
Two bulbs of 500 watt and 200 watt are manufactured to operate on 220 volt line. The ratio of heat produced in 500 W and 200 W, in two cases, when firstly they are joined in parallel and secondly in series, will be
|
(a) |
(b) |
(c) |
(d) |
