18/08/2019 CF-OYM

Regd. Office : Aakash Tower, 8, Pusa Road, New Delhi-110005, Ph.011-47623456

MM : 45 FORTNIGHTLY TEST SERIES Time : 90 min.

(for NEET/AIIMS-2020)
Subjective Test –1

Topics covered:
Physics : Electric Charges & Field, Electrostatic Potential and Capacitance: Introduction,
electrostatic potential, potential due to a point charge, potential due to an electric dipole,
potential due to a system of charges, Equipotential surfaces, Calculating field from
potential, Potential energy of a system of charges, Potential energy in an external field

Chemistry : Solid State, Solutions

Biology : Reproduction in Organisms, Sexual Reproduction in Flowering Plants, Human

Reproduction

PHYSICS

Q1. In what position of electric dipole, in uniform electric field, dipole is in stable equilibrium position? [1]

Q2. A point charge +Q is placed at point O as shown in the figure. Is the potential difference VA – VB positive,
negative or zero? (consider reference at infinity) [1]

Q3. Derive the expression for electric potential, at a point on the equatorial line, of an electric dipole. [2]

Q4. Can two equipotential surfaces intersect each other? Give reasons. [2]

Q5. (a) State Gauss’ law. [1]

(b) A thin straight infinitely long conducting wire of linear charge density ‘λ’ enclosed by a cylindrical
surface of radius ‘r’ and length l, its axis coinciding with the length of the wire. Obtain the expression
for the electric field, at a point on the surface of cylinder. [3]

OR

(a) Two charges –q and +q are located at point A(0, 0, –a) and B(0, 0, +a) respectively. How much work is
done in moving a test charge from point P(7, 0, 0) to Q(–3, 0, 0)? [3]

(b) What is the electrostatic potential due to an electric dipole at an equatorial point? [1]

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One Year Medical-2020 Subjective Test (OYM_ST01) Code-C

Q6. (a) Derive an expression for the electric field E due to dipole of length ‘2a’ at a point at distance r from the
centre of the dipole on the axial line [3]
(b) Draw the graph of E versus r for (r>>a) due to electric dipole, in axial position. [2]
OR
(a) Draw the equipotential surfaces, due to an electric dipole. Locate the point where the potential due to
the dipole is zero. [3]
(b) Two points charges 4Q, Q are separated by 1 m in air. Calculate the electrostatic potential energy of
the system of charges. (Q = 2 × 10–7 C) [2]

CHEMISTRY
Q7. How many octahedral voids are present in a F.C.C. unit cell? [1]

Q8. State the main advantage of molality over molarity. [1]

Q9. Explain the following with suitable examples. [2]

(i) Frenkel defect (ii) Schottky defect

Q10. State Henry’s law and mention one of its important application. [2]

Q11. (a) Based on the nature of intermolecular forces, classify the following solids. [4]

(i) Silicon carbide (ii) Ice

(b) An element X crystallises to form lattice with edge length of 404 pm. Calculate the density of the
element? (At. mass of X = 28 g/mol)
OR

(a) In a face centred lattice of X and Y, X atoms are present at the corners while Y atoms are present at
the face centres. What is the formula of the compound? [2]

(b) Express the relationship between atomic radius (r) and the edge length (a) in the bcc unit cell. [1]

(c) What is the effective number of atoms in simple cubic unit cell? [1]

Q12. (a) Calculate the freezing point of solution when 1.9 g of MgCl2 (M = 95 g mol-1) was dissolved in 50 g of
water, assuming MgCl2 undergoes complete ionization (Kf for water = 1.86 K kg mol-1) [3]

(b) Write two differences between ideal solutions and non-ideal solutions. [2]

OR

(a) (i) Define osmotic pressure.

(ii) Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells
in a solution containing. [3]

(1) 1.2% sodium chloride solution?

(2) 0.4% sodium chloride solution?

(b) Define Raoult’s law. How the vapour pressure of a solvent is affected when a non-volatile solute is
dissolved in it? [2]

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Subjective Test (OYM_ST01) Code-C One Year Medical-2020

BIOLOGY
Q13. What is encystation in Amoeba? [1]
Q14. Define the term life span. [1]

Q15. Describe any four features of plants which discourage self-pollination and encourage cross-pollination. [2]
Q16. (a) Write the two main pre-fertilization events. [1]

(b) Write the function of oxytocin. [1]

Q17. (a) Describe the different categories of gametes on the basis of their morphology with examples. [2]

(b) Give any four characteristics of sexual reproduction. [2]

OR

Enumerate the events in the ovary of the human female during

(a) Follicular phase of menstrual cycle. [1½]

(b) Luteal phase of menstrual cycle. [1½]

(c) Write any four differences between spermatogenesis and oogenesis. [1]

Q18. (a) With the help of diagram, explain the organisation of an angiospermic embryo sac. [2]

(b) Define the following :

(i) Megasporogenesis

(ii) Xenogamy [1]

(c) What are the advantages of seed to angiosperms? [2]

OR

Describe the events of spermatogenesis with the help of a schematic representation. [5]

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