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1. Calculate the distance upto which ray optics is a good approximation for light of wavelength 500 nm falls on an aperture of width 0.5 mm.
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(c) 25 cm |
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2. The transverse nature of light is shown in :
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(c) Polarisation |
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3. If a material having intensity of magnetisation 500 Am - 1 is placed in a magnetising field of 1000 Am-1, then the susceptibility of the material is :
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(d) 0.5 |
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4. In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6 A, then that in the secondary coil is
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(b) 2A |
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5. A thin conducting spherical shell of radius R has a charge Q which is uniformly distributed on its surface. The correct plot for electrostatic potential due to this spherical shell is :
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(d) |
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6. In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then, the maximum possible velocity of the emitted electron will be :
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(d) √6hν0/m |
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7. "Ski wax" is an application of nano product in the field of :
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(a) sports |
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8. An electric dipole is placed at an alignment angle of 30° with an electric field of 2x105 NC-1 . It experiences a torque equal to 8 Nm. The charge on the dipole if the dipole length is 1 cm is :
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(d) 8mC |
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9. For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is :
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(b) 30° |
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10. First diffraction minimum due to a single slit of width 10x10-5 cm is at 30°. Then wavelength of light used is :
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(d) 500 Å |
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11. To obtain sustained oscillation in an oscillator
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(d) All of the above |
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12. The dimension of 1/ω0ε0 is:
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(d) L2 T-2 |
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13. In Joule's heating law, when R and t are constant, if the H is taken along the y-axis and I? along the x-axis, the graph is
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(b) Straight line |
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14. A radioactive element has No number of nuclei at t = 0. The number of nuclei remaining after half of a half-life that is, ( T= 1/2 T1/2) is:
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(d) N0/√2 |
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15. In the combination of the following gates, write the Boolean equation for output Y in terms of input A, B, C.
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(c) Ā+B+C |
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