CHEMISTRY SECTION L

                 1.  Vermicompost is a/ an

                          (a) Inorganic fertilizer

                          (b) Toxic substance

                         (c) Organic bio fertilizer

                         (d) Synthetic fertilizer

                  2.  The isotope of uranium capable of sustaining chain reactions is

(a)    U -235

(b)   U- 238

(c)    U -239

(d)   None of these

                  3.  With reference to the usefulness of the by-products of sugar industry, consider the following statements

1.       Bagasse can be used as biomass fuel for the generation of energy.

2.       Molasses can be used as one of the feedstocks for the production of synthetic chemical fertilizers.

3.       Molasses can be used for the production of ethanol.

Which of the statements given above is/ are correct?

(a)    Only 1

(b)   2 and 3

(c)    1 and 3

(d)   All of these

                4.  In an atom the order of filling up of the orbitals is governed by

(a)    Aufbau Principle

(b)   Heisenberg’s uncertainty principle

(c)    Hund’s  rule

(d)   Pauli’s exclusion principle

               5.  Regarding the atom of a chemical element, the magnetic quantum number refers to

(a)    Shape

(b)   Size

(c)    Orientation

(d)   Spin

              6. By which one of the following, an old written material which cannot be read easily, can be read?

                                (a)    Y- rays

                                (b)   X- rays

                                (c)    IR- rays

                                (d)   Radio frequency waves

           7.  The elements of a group in the periodic table.

            (a)    Have similar chemical properties

           (b)   Have consecutive atomic numbers

           (c)    Are isobars

           (d)   Are isotopes

            8.   Which one among the following polymers is used for making bullet- proof material?  

                      (a)    Polyvinyl chloride

   (b)   Polystyrene

   (c)    Polyethylene  

   (d)   Polyamide

            9.  The pH of fresh groundwater slightly decreases upon exposure to air because

(a)    Carbon dioxide from air is dissolved in the water

(b)   Oxygen from air is dissolved in the water

(c)    The dissolved carbon dioxide of the groundwater escapes into air

(d)   The dissolved oxygen of the groundwater escapes into air

           10. which one among the following statements is correct?

                             (a)    All bases are alkalis

                             (b)   None of the basis is alka

                              (c)   there are no more bases except the alkalis

                       (d) All alkalis are bases but all bases are not alkalis

           11. which one among the following statements about an atom is not correct?

       (a)    Atoms always combine to form molecule

      (b)   Atoms are the basic units from which molecules and ions are formed

      (c)    Atoms are always neutral in nature

      (d)   Atoms aggregate  in large numbers to from the matter that we can see, feel and touch

Answer:

1.       C

2.       A

3.       C

4.       A

5.       C

6.       B

7.       A

8.       C

9.       A

10.   D

11.   D