Sample Questions Papers

1. Two bodies with masses m₁ and m₂ are moving with equal K.E. Their linear moments are numerically in the ratio

a)                b)        c)                                                      d)

2. A sound wave of frequency 500 Hz covers a distance of 1000 meters in 5 seconds. What is the wavelength

a) 2 m                   b) 1 m               c) 0.4 m                    d) 0.02m

3. A circle and a square are equal in area, whose perimeter is larger

a) Circumference (perimeter of circle) > Perimeter of square                   

b) Circumference (perimeter of circle)  < Perimeter of square

c) Circumference of circle  =  Perimeter of square                                               

d) None of the above

4. log₃ log₄x > 0  then

a) x > 1        b) x > 4             c) x > 64                   d) None of these

5. Which of the following has maximum ionisation potential

a) Mg            b) Si                  c) Al                          d) P

        6. A new electron enters into the orbital for which

        a) (n + l) is minimum              b) (n + l) is maximum    c) (n + m) is minimum            d) (n + m) is maximum

7. Which of the following is a non-volatile memory

a) ROM                                  b) RAM                     c) LSI                                        d) VLSI

8. The assembler is a

a) Machine language program                               b) Assembly language program

c) High level language program                             d) None of these

9. Which one of the following rocks can undergo folding

i) Sedimentary                       ii) Metamorphic         iii) igneous

a) i only                                 b) i and ii                   c) i and iii                      d) i, ii and iii

10. According to the currently accepted theory for the origin of the solar system:

a) A huge nebula collapsed under it own gravitational attraction

b) The nebula formed a disc with the Sun in the centre

c) Planetesmials accreted from gaseous, liquid and solid particles.

d) All the above

1. Which amino acid is involved in purine biosynthesis

a) Glycine    b) aspartate     c) glutamine         d) all the above

2. Carbonic acid (H₂CO₃) ionizes partially in water to form bicarbonate (HCO₃^- ) and H⁺. What will happen to a solution containing these ions when a small amount of a strong base is added

a) More of the (H₂CO₃) will ionize to form (HCO₃^- )        b) More of the (HCO₃^- ) will combine with H⁺ to form (H₂CO₃)

c) Nothing will change                                                     d) all the above

3. Which of the following leads to the decrease in the fluidity in the lipid bilayer

a. An increase in the unsaturation of the phospholipid fatty acyl chains  b. Decrease in the amount of cholesterol in bilayer

c. Increase in the temperature of the bilayer                                              d. An increase in the length of fatty acid chain

4. Na⁺K⁺ ATPase and SERCA pumps are inhibited by

a) Tetrodotoxin                     b) Dendrotoxin          c) Vandate                   d) Bungarotuxin

5. T_H cell is distinguished from T_c cell by the presence of which type of glycoprotein on their surface?

a) Presence of CD₄               b) Absence of CD₄   c) Presence of MHC-I on the TH cell        d) None of these

6. The first Antibody synthesized by the Neonate?

a) lg G          b) lg A              c) lg M                       d) Ig E

7. In DNA structure ‘propeller trait’ means

a) two bases orient antiparallel to each other                                b) two bases flip with respect to each other

c) the bases of DNA base pairs twist with respect to each other     d) two bases stock with respect to each other with 3.4 Aº

8. Rifampicin resistant mutarts of E. coli were obtained in an experiment. Which of the following is the most likely to have

    undergone a mutation

a) amino-acyl t-RNA synthetase                            b) Sigma factor of RNA polymerase       

c) Beta subunit of RNA polymerase                      d) Alpha subunit of RNA polymerase

9. The  egg of frog is

a) Telolecithal                        b) Microlecithal         c) Centrolecithal           d) Alecithal

10. The nature of endosperm in coconut is

a. Cellular                              b. Helobial                 c. Nucellar                    d. All of these

11. Oxygen is reduced to water in which stage of respiration?

a) Glycolysis                                                          b) Kreb’s cycle             c) ETC d) All of the above

12. Nitrogen fixation means, conversion of          

a)  Nitrates to ammonia         b) Nitrogen to ammonia    c) Ammonia to nitrates      d) Proteins to ammonia

13. The hypothalamus is a major coordinating and control center because: 

a.        it stimulates appropriate responses by peripheral target cells

b.        it stimulates responses to restore homeostasis

c.        it initiates endocrine and neural reflexes

d.        it contains autonomic centers and acts as an endocrine organ

14. The amino acid derivative hormone epinephrine is responsible for:

a) release of lipids by adipose tissue   b) glycogen breakdown    c) increased cardiac activity    d) all of the above

15. In a cross AaBbCcDd x AaBbCcDd, what is the probability of producing the genotype AABbccDd

a) 1/8           b) 1/16              c) 1/32                      d) 1/64

16. Inheritance of ABO blood group shows

a) Polyploidy                                                           b) polygyny                  c) multiple allelism               d) incomplete dominance

17. Species of a genus have common

a) Karyotype                                                          b) Ancestry                  c) Genetic material                 d) Anatomy

18. Which among the following is NOT true about Simpson's index (D)

a) It is directly proportional to dominance              b) It is inversely proportional to diversity

c) It is directly proportional to diversity                  d) None of the above

19. Phytoplanktons occur abundantly in which zone

a) Littoral                               b) Profundal              c) Limnetic                    d) Benthic

20. Oligotrophic soils have

 (i) High Nutrient retention capacity                        (ii) high leaching rate   

(iii) Poor nutrient retention capacity                       (iv) Low leaching rate

Choose the correct option among the following:

a) i and ii                               b) ii and iii                  c) i and iv                      d) iii and iv

21. Sympatric population shows

a) Population whose geographic ranges overlap    b) Population showing similar adaptations

c) Population showing similar adaptations               d) Population at verge of extinction

22. A particular gene has only two alleles, W and w. The proportion of the W allele in a particular population is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the ww genotype

a) 0.04         b) 0.8                c) 0.64                      d) 0.32

23. The mimicry in which mimic is defenseless but has Antipredatory marks like the model which has

defense against predators known as:

a) Batesian Mimicry              b) Mullerian Mimicry            c) Both a & b                  d) None of the above

24. Yeast Artificial chromosome (YAC) is used for

a) cloning large segments of DNA                         b) cloning only yeast genomic sequences

c) cloning of only cDNA sequences                      d) all DNA except plant DNA sequences

25. Recombinant live attenuated vaccine against hepatitis B was prepared from

a) Plasma of chronically infected individual                                               

b) Recombinant yeast expressing hepatitis B surface antigen

c) Recombinant vaccinia virus expressing hepatitis B surface antigen

d) Transgenic plants expressing Hepatitis  B surface antigen

26. Dithiothreitol and  merceptoethanol is used because

a) Both reduces disulfide linkages                         b) One reduces and the other oxidizes disulfide linkages

c) Both oxidizes disulfide linkages                         d) None of the above

27. T_m of primer is calculated by using formula T_m=

a) 4 (G+C) & 2 (A+T)            b) 2(G+C) & 4(A+T)               c) 2(G+C) + 2(A+T)                     d) None of the above

28. TEM is used to study

a) Internal structure              b) Surface molecules            c) Both a and b                           d) None of the above

1.     a) Explain the steps involved in the fatty acid biosynthesis.

         b) How unsaturated fatty acids are synthesized?

2.     Oral rehydration therapy saves the lives of millions of victims of Cholera and other diarrhea-producing diseases. Why is this therapy, which requires feeding dilute salts and glucose successful?

3.     What are the two major pathways by which antibody antigen complexes are eliminated?         

4.     What is ternary complex. How different eukaryotic initiation factors help in translation initiation in eukaryotes?        

5.     What is the mode of floral development in Arabidopsis.

6.     Name the C₄ variants & on which basis these variants are described.

7.     How different  hormones control the blood calcium levels

8.     How pericentric inversion influences the nature of gamete formation?

9.     Why tropics are rich in biodiversity?

10.   What are some factors that prevent exponential growth in a population? List some density-dependent and density-independent limiting factors?

11.   About 70 percent of all white North Americans can taste the chemical phenylthiocarbamide, and the remainder cannot. The ability to taste is determined by the dominant allele T, and the inability to taste is determined by the recessive allele t. If the population is assumed to be in Hardy-Weinberg equilibrium, what are the genotypic and allelic frequencies in this population?

12.   Techniques for introducing transgenes into human gametes or zygotes may be developed within a few years. At the present time such manipulations are not permitted by any nation with sophisticated expertise in gene therapy. Discuss the ethical issues that are the basis of this prohibition on germ line gene therapy.                                                                           

13.   In selecting a DNA sequence to be used as a template for construction of PCR primers, why do many investigators look for sequences rich in codons for tryptophan or methionine?