Explanation:
The incline is smooth; therefore, all bodies will slip on the incline. Also, as the mass of bodies is same, they will reach the bottom in equal time.
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When unpolarised light beam is incident from air onto glass (n = 1.5) at the polarising angle
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(a) Reflected beam is polarised 100 percent |
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(b) Reflected and refracted beams are partially polarised |
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(c) The reason for (a) is that almost all the light is reflected |
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(d) All of the above |
A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear size (nuclear radius)
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(a) |
(b) 1 : |
(c) |
(d) 1 : |
A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black:
$\frac{1}{2}$
$2$
$\frac{1}{4}$
$4.$
Rest mass energy of an electron is 0.51 MeV. If this electron is moving with a velocity 0.8 c (where c is velocity of light in vacuum), then kinetic energy of the electron should be.
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(a) 0.28 MeV |
(b) 0.34 MeV |
(c) 0.39 MeV |
(d) 0.46 MeV |
A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector
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(a) 2 photon of energy 10.2 eV |
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(b) 2 photon of energy of 1.4 eV |
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(c) One photon of energy 10.2 eV and an electron of energy 1.4 eV |
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(d) One photon of energy 10.2 eV and another photon of 1.4 eV |
Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio
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(a) 25 : 1 |
(b) 5 : 1 |
(c) 9 : 4 |
(d) 25 : 16 |
The core of a transformer is laminated so that
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(a) Ratio of voltage in the primary and secondary may be increased |
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(b) Rusting of the core may be stopped |
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(c) Energy losses due to eddy currents may be reduced |
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(d) Change in flux is increased |
