- AOnly white and black fringes will be obtained
- BWhite fringes will be obtained
- ✓Central fringe will be white but two-three colored fringes will appear black
- DNone of the above.
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Nuclear fission was discovered by
|
(a) Auto Hahn and F. strassmann |
(b) Fermi |
|
(c) Bethe |
(d) Rutherford |
Which one of the following devices makes use of the electrons to strike certain substances to produce fluorescence
|
(a) Thermionic valve |
(b) Photoelectric cell |
|
(c) Cathode ray oscilloscope |
(d) Electron gun |
In which of the following is the interference due to the division of wave front
|
(a) Young's double slit experiment |
(b) Fresnel's biprism experiment |
|
(c) Lloyd's mirror experiment |
(d) Demonstration colours of thin film |
The mass number of a nucleus is equal to the number of
|
(a) Electrons it contains |
(b) Protons it contains |
|
(c) Neutrons it contains |
(d) Nucleons it contains |
A transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90 A. The efficiency of the transformer is
|
(a) 20% |
(b) 40% |
(c) 70% |
(d) 90% |
The electric field due to a uniformly charged sphere of radius R as a function of the distance from its centre is represented graphically by
|
(a) |
(b) |
(c) |
(d) |
Which represents NAND gate
|
(a) |
(b) |
(c) |
(d) |