- AIsotopes
- BIsobars
- CIsotones
- DNone of the above
Explanation:
In a Bainbridge mass spectrometer positive rays of the same element produce different traces. The traces correspond to isotopes. Isotopes are atoms of same element. They have same atomic number (nuclear charge) but different mass number (number of neutrons). Positive rays (or anode rays or canal rays) contains ions obtained by knocking out electrons from gaseous atoms.
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In an isolated parallel plate capacitor of capacitance C, the four surface have charges
and
as shown. The potential difference between the plates is

|
(a) |
(b) |
(c) |
(d) |
Assertion : Ultraviolet radiation are of higher frequency waves are dangerous to human being.
Reason : Ultraviolet radiation are absorbed by the atmosphere
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(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. |
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(d) If the assertion and reason both are false. |
When the convergent nature of a convex lens will be less as compared with air
|
(a) In water |
(b) In oil |
(c) In both (a) and (b) |
(d) None of these |
In an electroplating experiment, m gm of silver is deposited when 4 ampere of current flows for 2 minute. The amount (in gm) of silver deposited by 6 ampere of current for 40 second will be
|
(a) 4 m |
(b) m/2 |
(c) m/4 |
(d) 2 m |
Light from a hydrogen discharge tube is incident on the cathode of a photoelectric cell the work function of the cathode surface is 4.2 eV. In order to reduce the photo-current to zero the voltage of the anode relative to the cathode must be made
|
(a) – 4.2 V |
(b) – 9.4 V |
(c) – 17.8 V |
(d) +9.4 V |
A man who cannot see clearly beyond 5 m wants to see stars clearly. He should use a lens of focal length
|
(a) – 100 m |
(b) + 5 m |
(c) – 5 m |
(d) Very large |
When a point source of light is at a distance of one metre from a photo cell, the cut off voltage is found to be V. If the same source is placed at 2 m distance from photo cell, the cut off voltage will be
|
(a) V |
(b) V/2 |
(c) V/4 |
(d) V/ |