1. Which one of the following is a xerophytic plant in which the stem is modified into the flat green and succulent structure?
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1 BIOLOGY- PLANTS 1. Which one of the following is a xerophytic plant in which the stem is modified into the flat green and succulent structure? (a) Opunita (c) Hydrilla (b) Casuarina (d) Acacia 2. Aestivation of petals in the flower of cotton is correctly shown in 3. The correct floral formula of soyabean is 4. Consider the following four statements (A), (B), (C), and (D) and select the right option for two correct statements Statements: (A) In vezillary aestivation, the large posterior petal is called standard, two lateral ones are wings and two small anterior petals are termed keel (B) The floral formula for liliaceare is (C) In pea flower, the stamens are monadelphous. (D) The floral formula for Soolanaceae is The correct statements are (a) (A) and (C) (b) (A) and (B) No. 71A, 2 nd Floor Page 1
2 (c) (B) and (C) (d) (C) and (D) 5. In unilocular ovary with a single ovule, the placentation is (a) Marginal (c) Free central (b) Basal (d) Axile 6. Keel is the characteristic of the flowers of (a) Gulmohar (c) Calotropis (b) Cassia (d) Bean 7. Ovary is half-inferior in the flowers of (a) Guava (c) Brinjal (b) Plum (d) Cucumber 8. The technical term used for the androecium in a flower of China rose (Hibiscus rosa sinensis) is (a) Monadelphous (c) Poluandrous (b) Diadelphous (d) Polyadelphous 9. Coiling of garden pea tendrils around any support is an example of (a) Thigmotaxis (C) Thigmotropism (b) Thigmonasty (d) Thermotaxis 10. Which one of the following figures represents the placentation in dianthus? 11. Whorled, simple leaves with reticulate venation are present in (a) Calotropis (c) China rose (b) Neem (d) Alstonia 12. Which one fo the following statements is correct? (a) Seeds of orchids have oil-rich endosperm. No. 71A, 2 nd Floor Page 2
3 (b) Placentation in primrose is basal. (c) Flower of tulip is a modified shoot. (d) In tomato, the fruit is a capsule 13. The Eyes of the potato tuber are: (a) Flower buds (c) Axillary buds (b) Shoot buds (d) Root buds 14. Flowers are zygomorphic in (a) Gulmohar (c) Datura (b) Tomato (d) Mustard 15. A drupe is developed in (a) Wheat (C) Tomato (b) Pea (d) Mango 16. Which one fo the following is wrongly matched? (a) Puccinia (b) Root (c) Cassia (d) Root pressure - Smut - Exarch protozylem - Imbricate aestivation - Guttation 17. the ovary is half inferior in flowers of (a) Cucumber (c) Guava (b) Cotton (d) Peach 18. The Correct floral formula of chilli is: 19. How many plants in the list given below have composite fruits that develop from an inflorescence? Walnut, poppy, radish, fig, pineapple, apple tomato, mulberry, No. 71A, 2 nd Floor Page 3
4 (a) Four (c) Two (b) Five (d) Three 20. How many plants in the list given below have marginal placentation? Mustard, Gram, Tulip, Asparagus, Arhar, Sun hemp, Chilli, Colchicine, Onion, Moong, Pea, Tobacco, Lupin (a) Five (c) Three (b) Six (d) Four CHEMISTRY SURFACE CHEMISTRY 21. Which of the following characteristics is not correct for physical adsorption: (a) Adsorption on solids is reversible (b) Adsorption is spontaneous (c) Both enthalpy and entropy of adsorption are negative (d) Adsorption increases with increase in temperature 22. Identify the correct statement regarding enzymes: (a) Enzymes are specific biological catalysts that cannot be poisoned (b) Enzymes are specific biological catalysts that posses well defined active sites (c) Enzymes are specific biological catalysts than can normally function at very high temperatures (1000 K) (d) Enzymes are normally heterogeneous 23. Which of the following forms cationic micelles above certain concentration: (a) Sodium dodecyl suphate (b) Sodium acetate (c) Urea (d) Cetyltrimethyl ammonium bromide 24. The statement not applicable to chemisoption is that it is: (a) Highly specific (b) Independent of temperature (c) Irreversible (d) Slow No. 71A, 2 nd Floor Page 4
5 25. The blue colour of water in the sea is due to: (a) Scattering of blue light by water molecules (b) Reflection of blue sky by sea water (c) Refraction of blue light by the impurities in sea water (d) Adsorption of other colours, except the blue colour by water molecules 26. Which of the following is correct for lyophilic slo: (a) Irreversible sol (b) Formed from inorganic substances (c) Readily coagulated by addition of electrolyte (d) Self stabilized 27. Rate of physisorption increases with: (a) Decrease in temperature (b) Increase in temperature (c) Decrease in pressure (d) Decrease in surface area 28. Milk is colloid in which: (a) liquid is dispersed in liquid (b) Gas is dispersed in liquid (c) Sugar is dispersed in water (d) Solid is dispersed in liquid 29. Physical adsorption is inversely proportional to: (a) Temperature (b) Volume (c) Concentration (d) All of these 30. The migration of colloidal particle under the influence of electric field towards an electrode is known as: (a) Electrophoresis (b) Electro-osmosis (c) Tyndall effect (d) Brownian movement No. 71A, 2 nd Floor Page 5
6 31. Butter is a colloidal solution of: (a) Solid-solid (b) Liquid-solid (c) Solid-liquid (d) Gas-solid 32. How many layers are adsorbed in chemical adsorption: (a) Zero (b) One (c) Two (d) Infinite 33. In the adsorption of oxalic acid on activated charcoal, the activated charcoal is known as: (a) Adsorber (b) Adsorbent (c) Absorber (d) Adsorbate 34. Adsorbed acetic acid on activated charcoal is: (a) Adsorbate (b) Adsorber (c) Absorber (d) Absorbent 35. Alum is widely used to purify water since: (a) It forms complex with clay particles (b) It coagulates the mud particles (c) It exchanges Ca 2+ and Mg 2+ ions present in hard water (d) Its sulphate ion is water purifier 36. What is the name of a phenomenon in which both adsorption and absorption takes place: (a) Chemisorption (b) Physisorption (c) Desorption No. 71A, 2 nd Floor Page 6
7 (d) Sorption 37. What is the equation form of Langmuir isotherm under high pressure: (a) x m = a b (b) x m = a p (c) x m = 1 p a (d) x m = b a 38. Which of the following is a lyophillic colloidal solution: (a) Aqueous starch solution (b) Aqueous protein solution (c) Gold sol (d) Polymer solutions in some organic solvents 39. Which one of the following statements is not correct: (a) Physical adsorption decreases with increase in the temperature (b) Physical adsorption is multilayered (c) Activation energy of physical adsorption is very high. (d) enthalpy change of physical adsorption is about 20 kj mol Which one of the following is an example of adsorption: (a) Ammonia in contact with water (b) Anhydrous CaCl 2 with water (c) Silica gel in contact with water vapours (d) All of these No. 71A, 2 nd Floor Page 7
8 PHYSICS 41. For the given reaction, the particle X is 6C 11 5B 11 + β + + X (a) neutron (b) anti neutrino (c) neutrino (d) proton 42. Maximum frequency of emission is obtained for the transition (a) n = 2 to n = 1 (b) n = 1 to n = 2 (c) n = 6 to n = 2 (d) n = 2 to n = Nuclear fission is best explained by (a) liquid droplet theory (b) Yukawa π meson theory (c) independent particle model of the nucleus (d) proton-proton cycle 44. The life span of atomic hydrogen is (a) fraction of one second (b) one year (c) one hour (d) one day 45. When an electron does transition from n = 4 to n = 2, then emitted line spectrum will be (a) first line of Lyman series (b) second line of Balmer series (c) first line of Paschen series (d) second line of Paschen series No. 71A, 2 nd Floor Page 8
9 46. Intensity of X-rays depends upon the number of (a) positrons (b) neutrons (c) protons (d) electrons 47. A substance reduces to 1/16 th of its original mass in 2 h. The half-life period of the substance will (a) 30 min (b) 90 min (c) 45 min (d) 60 min 48. X(n, a) 3 7 Li, then X will be (a) 10 5 B (b) 9 5 B (c) 11 4 Be (d) 4 2 He 49. Half life of a radioactive element is 12.5 hour and its quantity is 256 g. After how much time its quantity will remain 1 g? (a) 50 hrs (b) 100 hrs (c) 150 hrs (d) 200 hrs 50. M n and M p represent the mass of neutron and proton respectively. An element having mass m has N neutrons and Z protons, then the correct relation will be (a) M < {N M n + Z M p} (b) M > {N M n + Z M p} (c) M = {N M n + Z M p} No. 71A, 2 nd Floor Page 9
10 (d) M = N {M n + M p} 51. Energy released in nuclear fission is due to (a) some mass is converted into energy (b) total binding energy of fragments is more than the binding energy of parental element (c) total binding energy of fragments is less than the binding energy of parental element (d) total binding energy of fragments is equal to the binding energy of parental element 52. Rutherford s α particle experiment shows that the atoms have (a) electrons (b) neutrons (c) nucleus (d) protons 53. Which of the following are suitable for the fusion process? (a) light nuclei (b) heavy nuclei (c) element lying in the middle of the periodic table (d) middle elements, which are lying on binding energy curve 54. A sample of radioactive element containing 4 x active nuclei. Half life of element is 10 days, then number of decayed nuclei after 30 days (a) 0.5 x (b) 2 x (c) 3.5 x (d) 1 x A deuteron is bombarded on 8O 16 nucleus then α particle is emitted. The product nucleus is (a) 7N 13 (b) 5N 10 (c) 4Be 9 (d) 7N 14 No. 71A, 2 nd Floor Page 10
11 56. An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force F between the two is (a) K e2 r 2 r (b) -E e2 r 3 r (c) E e2 r 3 r (d) -E e2 r 3 r 57. Solar energy is mainly caused due to (a) burning of hydrogen in the oxygen (b) fission of uranium present in the Sun (c) fusion of protons during synthesis of heavier elements (d) gravitational contraction 58. The volume occupied by an atom is greater than the volume of the nucleus by a factor of about (a) 10 1 (b) 10 5 (c) (d) In which of the following system will be radius of the first orbit (n = 1) be minimum? (a) doubly ionized lithium (b) singly ionized helium (c) deuterium atom (d) hydrogen atom 60. The mass of proton is u and that of neutron is u (u = atomic mass unit). The binding 4 energy of 2He is (a) J (c) 28.4 MeV Given helium nucleus mass u. (b) erg (d) u No. 71A, 2 nd Floor Page 11
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