Which statement is correct for a zone plate and a lens
|
(a) Zone plate has multi focii whereas lens has one |
|
(b) Zone plate has one focus whereas lens has multiple focii |
|
(c) Both are correct |
|
(d) Zone plate has one focus whereas a lens has infinite |
(a) Zone plate has multi focii whereas lens has one
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The energy in MeV is released due to transformation of 1 kg mass completely into energy (c = 3
| (a) 7.625 ×10 MeV |
(b) 10.5 
|
(c) 2.8 
|
(d) 5.625
|
The given figure shows the wave forms for two inputs A and B and that for the output Y of a logic circuit. The logic circuit is
|
(a) An AND gate |
(b) An OR gate |
(c) A NAND gate |
(d) An NOT gate |
A fish rising vertically up towards the surface of water with speed 3 ms–1 observes a bird diving vertically down towards it with speed 9 ms–1. The actual velocity of bird is
|
(a) 4.5 ms–1 |
(b) 5. ms–1 |
(c) 3.0 ms–1 |
(d) 3.4 ms–1 |
