| 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. | (c) 25 cm |
| 2. The transverse nature of light is shown in : | (c) Polarisation |
| 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 : | (d) 0.5 |
| 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 | (b) 2A |
| 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 : | (d) |
| 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 : | (d) √6hν0/m |
| 7. "Ski wax" is an application of nano product in the field of : | (a) sports |
| 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 : | (d) 8mC |
| 9. For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is : | (b) 30° |
| 10. First diffraction minimum due to a single slit of width 10x10-5 cm is at 30°. Then wavelength of light used is : | (d) 500 Å |
| 11. To obtain sustained oscillation in an oscillator | (d) All of the above |
| 12. The dimension of 1/ω0ε0 is: | (d) L2 T-2 |
| 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 | (b) Straight line |
| 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: | (d) N0/√2 |
| 15. In the combination of the following gates, write the Boolean equation for output Y in terms of input A, B, C. | (c) Ā+B+C |
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