- A2H4
- B8O16
- C26Fe56
- D92U238
Explanation:
Binding energy per nucleon increases with atomic number. The greater the binding energy per nucleon the more stable is the nucleus.
For 26Fe56 number of nucleons is 56.
This is most stable nucleus, since maximum energy is needed to pull a nucleon away from it.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Three charges 4q, Q and q are in a straight line in the position of 0, l/2 and l respectively. The resultant force on q will be zero, if Q =
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(a) – q |
(b) -2q |
(c) |
(d) 4q |
The
X-ray emission line of tungsten occurs at λ = 0.021 nm. The energy difference between K and L levels in this atom is about
| (a) 0.51MeV | (b) 1.2 MeV | (c) 59 KeV | (d) 13.6 eV |
Assertion : A potentiometer of longer length is used for accurate measurement.
Reason : The potential gradient for a potentiometer of longer length with a given source of e.m.f. becomes small.
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(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. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A certain piece of silver of given mass is to be made like a wire. Which of the following combination of length (L) and the area of cross-sectional (A) will lead to the smallest resistance
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(a) L and A |
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(b) 2L and A/2 |
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(c) L/2 and 2 A |
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(d) Any of the above, because volume of silver remains same |
Assertion : Electron has higher mobility than hole in a semiconductor.
Reason : Mass of electron is less than the mass of hole.
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(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. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become
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(a) Double |
(b) Half |
(c) Four time |
(d) No change |
If each resistance in the figure is of 9 W then reading of ammeter is
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(a) 5 A |
(b) 8 A |
(c) 2 A |
(d) 9 A |