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776. The chemical usedf as a ""fixer"" in photography is :
A. borax
B. sodium thiosulphate
C. sodium sulphate
D. ammonium persulphate
Explanation:
777. If a proton of mass m is moving with velocity of light, its mass will be :
A. unchanged
B. large but finite
C. infinite
D. zero
Explanation:
778. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ? 1. Assertion (A) : For the production of aluminium, cheap electricity is essential. 2. Reason (R) : Extraction of aluminium from its ore requires abundant supply of electricity.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
779. The average salinity of sea water is
A. 2%
B. 2.5%
C. 3%
D. 3.5%
Explanation:
780. Consider the following statements about copper vapour lasers :Through originally invented in 1966, they are now being developed further for a wide variety of applocatopms necaise 1. they can produce short and long wavelength radiations. 2. they can be focussed on very small areas. 3. of their very high pulse repetition frequency and narrow pulse - widths.Of these statements, the correct ones are
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Explanation:
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