An X-ray machine has an accelerating potential difference of 25,000 volts. By calculation the shortest wavelength will be obtained as (h = 6.63 
; e =
coulomb)
|
(a) 0.25 Å |
(b) 0.50 Å |
(c) 1.00 Å |
(d) 2.50 Å |
(b) 0.50 Å
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Assertion : The positively charged nucleus of an atom has a radius of almost 
.
Reason : In a-particle scattering experiment, the distance of closest approach for a-particles is 
|
(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. |
In the disintegration series 
The value of Z and A respectively will be
|
(a) 92, 236 |
(b) 88, 230 |
(c) 90, 234 |
(d) 91, 234 |
The resistance of a galvanometer is 25 ohm and it requires 50μA for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is
|
(a) 2.5 |
(b) 1.25 |
(c) 0.05 ohm |
(d) 2.5 ohm |
