Water 1. What is dipole? These are the magnetic centres in the molecule These are the separation of electric charges in certain molecules These are partial positive and negative charges present in all molecules B&C None 2. Which of the following is true of the shape of the water molecule? It is a perfect tetrahedron H-O-H bond angle is 109.5° Shape of water molecule is a nearly tetrahedron It is not a tetrahedron None 3. Which of the following strategy the plant and bacterial cells have to resist the osmotic pressure Presence of a rigid cell wall Ability to maintain equal concentration in the cell and in the extracellular fluids Presence of vacuole Reducing the cytosolic osmolarity to a significant level None 4. How many average number hydrogen bonds a water molecule in ice under atmospheric pressure forms with other water molecules? 4 2 3 3.4 None 5. Hydrogen bond are strongest when Kinetic energy of the participating compounds is highest Both participating electronegative elements are same They are present in the hydrophobic environment Hydrogen elements and participating electronegative elements are in a straight line 1 & 2 3 & 4 None 6. Strength of the hydrogen bonds depend upon which of the following? Electronegativity of the participating hydrogen donor and acceptor Arrangement of the participating groups Both None None 7. Water molecule is polar because Oxygen attracts shared electron strongly There are two electric dipoles in the water Electrostatic attraction between H and O of the single molecule All of the above 1&2 None 8. What is true about the strength of the hydrogen bonding Directionality of the participating elements in the hydrogen bonding influence the strength of the hydrogen bonds Electronegativity difference in the elements might cause the difference in the hydrogen bond strength They get weaker if the kinetic energy of the molecule increases All of the above I & II None 9. Which of the following is not the strategy to transport the insoluble gases into the biological system Using an alternative gas Use of carrier proteins Chemical modification of the gaseous form All of the above. None 10. Which of the following mechanism is employed by multicellular animals to avoid osmotic lysis? Presence of non-expandable cell wall Increasing concentration of certain proteins in blood plasma Active transport of Na+ ions in the interstitial fluids. All of the above 2&3 None Time's up
