- AOnly the proton number changes.
- BBoth the neutron number and the proton number change.
- CThere is no change in the proton number and the neutron number.
- DOnly the neutron number changes.
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Two charges each of 1 coulomb are at a distance 1 km apart, the force between them is
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(a) |
(b) 9 |
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(c) |
(d) |

In Young’s experiment, the distance between slits is 0.28 mm and distance between slits and screen is 1.4 m. Distance between central bright fringe and third bright fringe is 0.9 cm. What is the wavelength of used light
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(a) 5000 Å |
(b) 6000 Å |
(c) 7000 Å |
(d) 9000 Å |
In the circuit shown in the adjoining figure, the current between B and D is zero, the unknown resistance is of
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(a) 4 Ω |
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(b) 2 Ω |
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(c) 3 Ω |
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(d) em.f. of a cell is required to find the value of X |
Assertion : Only microwaves are used in radar.
Reason : Because microwaves have very small wavelength.
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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 region surrounding a stationary electric dipoles has
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(a) Magnetic field only |
(b) Electric field only |
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(c) Both electric and magnetic fields |
(d) No electric and magnetic fields |
In the forward bias arrangement of a PN-junction diode
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(a) The N-end is connected to the positive terminal of the battery |
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(b) The P-end is connected to the positive terminal of the battery |
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(c) The direction of current is from N-end to P-end in the diode |
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(d) The P-end is connected to the negative terminal of battery |
If there had been one eye of the man, then
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(a) Image of the object would have been inverted |
(b) Visible region would have decreased |
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(c) Image would have not been seen three dimensional |
(d) (b) and (c) both |
The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is
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(a) 10% |
(b) 20% |
(c) 25% |
(d) 50% |