PG TRB chemistry online exam

MARAN ACADEMY

PG TRB CHEMISTRY

 

 

1. The number of free -OH groups present per glucose unit in cellulose is
   
   1.   4
   2.   3
   3.   2
   4.   1
2. ________ is the copying of a complementary messenger RNA on a DNA strand
   
   1.   Translation
   2.   Activation
   3.   Replication
   4.   Transcription
3. The peptide hormone which produces milk in mammary glands of women is
   
   1.   oxytocin
   2.   Glutathione
   3.   serotonin
   4.   Streptokinase
4. Which one of the following is not a property of amylase?
   1.   Gives violet colour without iodine
   2.   Has linear structure without branching
   3.   soluble in hot water
   4.   molecular weight is around 100000
5. Hydrolysis of D-lactose gives
   1.   Glucose + Fructose
   2.   Galactose + Fructose
   3.   Glucose + Galactose
   4.   it is not hydrolysed
6. .
   Which of the following is not a pyrimidine base?
   
   1.   Uracil
   2.   Thymine
   3.   Cytosine
   4.   Guanine
7. Precipitation of proteins by heat is called
   1.   denaturation
   2.   annealing
   3.   refolding
   4.   renaturation
8. Free sugar is broken down completely using
   1.   H2SO4
   2.   Br2/H2O
   3.   HIO4
   4.   HNO3
9. Casein is an example of
   1.   Fibrous protein
   2.   Globular protein
   3.   Derive protein
   4.   Conjugated protein
10. Which one among the following is a non – reducing disaccharides?
    1.   Maltose
    2.   Sucrose
    3.   Lactose
    4.   Cellbiase
11. One of the modern methods of studying free radical is_____.
    1.   IR spectra
    2.   UV spectra
    3.   CIDNP
    4.   Microwave spectra
12. Photo chemical reaction of ketones and Aldehydes which result in fission of the c-co bond followed by elimination co are classified as process_______.
    1.   Norrish Type – I
    2.   Norrish Type – II
    3.   Paterno – Buchi Type
    4.   Barton Type
13. Generally, the pericyclic reactions are highly
    1.   Stercoselective
    2.   Stereospecific
    3.   Regioselective
    4.   Chemoselective
14. Which one is a photochemical allowed process?
    1.   Electrocyclic reaction of butadiene (CON)
    2.   Electrocyclic reaction of hexatriene (DIS)
    3.   [2+2] cyclo addition
    4.   both (a) and (b)
15. Which one is a thermally allowed process?
    1.   Electrocyclic reaction of butadiene (CON)
    2.   Electrocyclic reaction of hexatriene (DIS)
    3.   [2+2] cyclo addition
    4.   both (a) and (b)
16. Acetone will
    1.   undergo Norrish type I reaction
    2.   act as sensitizer
    3.   undergo α- cleavage
    4.   All the above
17. When S1 state is converted to T1 state, the process is known as
    1.   Internal conversion
    2.   Energy transfer
    3.   Fluorescence
    4.   Intersystem crossing
18. Photochemistry is associated with absorption of light in _______ region
    1.   180 -800Aº
    2.   1800 – 8000Aº
    3.   1200 – 1800Aº
    4.   above 7000 Aº
19. Which one of the following name reaction is an example for decarboxylative halogenations?
    1.   Ullmann reaction
    2.   Barton reaction
    3.   Hunsdiecker reaction
    4.   Pschorr reaction
20. Diels – Alder’s reaction is an example of
    1.   Cycloaddition reaction
    2.   Electrocyclic reaction
    3.   Sigmatropic rearrangement
    4.   Both (a) &(b)