Question57:-An example of a low energy pure Beta emitter
A:-C-14
B:-Ra-226
C:-N-15
D:-U-238
Correct Answer:- Option-A

Question58:-Which of the following shows highest stretching frequencies in IR for
exocyclic olefinic double bond?

A:-methylene cyclobutane
B:-methylene cyclopentane
C:-methylene cyclohexane
D:-methylene cyclopropane
Correct Answer:- Option-D

Question59:-In organophosphate toxicity which of the following statements are
correct
)( Antidote is intravenous injection of atropine
(1) IF RBC cholinesterase level is more than 50% of normal, it indicates
organophosphate

toxicity

A:-Only (1)

B:-Only (Il)

C:-Both (I) and (II)
D:-Neither (I) nor (II)
Correct Answer:- Option-A

Question60:-o-nitroacetanilide or p-nitroacetanilide which shows absorption at
longer wavelength and why?

A:-o-nitroacetanilide due to intramolecular H-bonding
B:-p-nitroacetanilide due to intermolecular H-bonding
C:-o-nitroacetanilide due to conjugation
D:-p-nitroacetanilide due to conjugation

Correct Answer:- Option-A

Question61:-In a particular Neutron Activation Analysis two aliquots containing 3 ml
river water were taken. To one, 1 ml of standard solution containing 1 wg of 24)3+
was added and to other, 1 ml of deionized water was added. Both were subjected
to homogenous neutron flux. On counting the y radiation from #4: the counting rate
of first aliquot was 4000 cpm and second was 1000 cpm. Calculate the weight of Al
in the 3ml sample of river water.

A:-0.25 ug
B:-0.40 ug
C:-0.55 ug