Time: 2 ½ hrs Marks: 60

SECTION – A

Q.1 How many covalent bonds does ethane has? [1]

Q.2 In which form H+ ions exists in water? [1]

Q.3 Write Snell’s Law. [1]

Q.4 Which Liquid fills the space between eye lens and retina? [1]

Q.5 What is Electromagnetic Induction? [1]

Q.6 State the Modern Periodic Law. [1]

Q.7 What is chlor-alkali process? Why is it so called? [2]

Q.8 How does the electronic configuration of an atom related to its position in the Modern Periodic Table? [2]

Q.9 A bulb is rated at 5.0V - 100mA; calculate its (i) Power, and (ii) Resistance. [2]

Q.10 Write any two factors on which strength of induced current depends. [2]

Q.11 Give three differences between the displacement and double displacement reactions. [3]

Q.12 Give reasons for the following:
(a) Metals conduct electricity.
(b) Metals generally do not form compounds with hydrogen.
(c) Nitrogen gas is used to preserve food. [3]

Q.13 An 8cm. tall object is placed perpendicular to the principal axis of a convex lens of focal length 25cm. The distance of the object from the lens is 30cm. find the (i) Position, (ii) nature and (iii) size of the image formed. [3]

Q.14 Make a diagram to show how Hypermetropia is corrected. The near point of a Hypermetropic eye is 1m, what is the power of the lens required to correct this defect. Assume near point of normal eye is 25cm. [3]

Q.15 Differentiate between metals and non-metals on the basis of their chemical properties. [5]

OR
Draw the structures for the following compounds:
(i) Butanone (ii) Hexanal (iii) Methanol (iv) Propyne (v) Ethanoic acid [5]

Q.16 A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B each 20, which may way be used separately, in series, or in parallel. What are the currents in the three cases? [5]

OR
(i) What is an electric motor?
(ii) On what principle does an electric motor work?
(iii) Explain the functions of : (a) Commutator (b) Brushes
(iv) Differentiate between AC and DC. [5]

SECTION – B

Q.17 Define nastic movements? [1]

Q.18 Why are traits acquired during the life time of an individual not inherited? [1]

Q.19 What is biogas? [1]

Q.20 Consider the food-chain: Grass –-> Dear –-> Lion
What will happen if lions are removed from the above food chain? [2]

Q.21 Write any four characteristics of a good fuel. [2]

Q.22 Differentiate between homologous organs and analogous organs. [2]

Q.23 How do auxins promote the growth of a tendril around a support? [2]

Q.24 Draw neat and labelled diagram of nephron. [2]

Q.25 What are the differences between the transport of materials in xylem and phloem? [3]

Q.26 How is ozone formed in the upper atmosphere? Why is the damage to ozone layer a cause of concern to us? What causes the damage? [3]

Q.27 Draw the diagram of reproductive system of human female. Label fallopian tube, Uterus, cervix and vagina. What is ovulation and when does it take place during the menstrual cycle? Where does fertilization take place?