Decibel is defined in terms of
(1) voltage level
(2) power ratio
(3) current level
(4) None of these
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The speed of electro-magnetic radiation in a vacuum (1) Increases from radio rays to ?-rays (2) Decreases from radio rays to ?-rays (3) Depends upon the source of the radiation (4) Is equal for all factors or elements
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Ten friends shake hands with one another. Find out the total number of handshakes : (a) 20 (b) 45 (c) 10 (d) 5
There are three routes leading from A to B. For a person, starting off from A to reach B and then get back to A again, what will be the probability of changing his route if he takes two different routes to reach B and get back to A? (a) 3 (b) 2 (c) 6 (d) 9
Six men A, B, C, D, E and F are standing in a circle. B is in between F and C, A between E and D, and F is standing left of D. Who is between A and F? (1) C (2) B (3) D (4) E
In a small banquet there were, in all, 36 handshakes. How many guests were present there ? (a) 6 (b) 9 (c) 12 (d) 18
If w is the cubic root of the unit and n, a multiple of 3, then 1 + wn +2wn is equal to (1) 3 (2) 2 (3) 1 (4) 0
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The daily ?National Programme? of Doordarshan was first introduced in the year (1) 1970 (2) 1972 (3) 1980 (4) 1984
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