Question

Q.1.Electrical resistivity of a given metallic wire depends upon (1)
(a) its length (b) its thickness
(c) its shape (d) nature of the material
Q.2. Which of the following are exothermic processes? (1)
(i) Reaction of water with quick lime (ii) Dilution of an acid
(iii) Evaporation of water (iv) Sublimation of camphor (crystals)
(a) (i) and (ii) (b) (ii) and (iii)
(c) (i) and (iv) (d) (iii) and (iv)
Q.3 Exchange of genetic material takes place in (1)
(a) vegetative reproduction (b) asexual reproduction
(c) sexual reproduction (d) budding
Q.4 Which of the following phenomena of light are involved in the formation of a rainbow?
(a) Reflection, refraction and dispersion (1)
(b) Refraction, dispersion and total internal reflection
(c) Refraction, dispersion and internal reflection
(d) Dispersion, scattering and total internal reflection
Q.5 If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected? (1)
(a) Proteins breaking down into amino acids
(b) Starch breaking down into sugars
(c) Fats breaking down into fatty acids and glycerol
(d) Absorption of vitamins

Q.6. Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by (1)
a) Labeo, Chameleon, Salamander
(b) Hippocampus, Exocoetus, Anabas
(c) Hyla, Rana, Draco
(d) Whale, Dolphin, Turtle
Q.7 The blood leaving the tissues becomes richer in (1)
(a) carbon dioxide (b) water
(c) heamoglobin (d) oxygen
Q.8 What is the minimum resistance which can be made using five resistors each of 1/5 Ω?
(a) 1/5 Ω (b) 1/25 Ω (1)
(c) 1/10 Ω (d) 25 Ω
Q.9 Although metals form basic oxides, which of the following metals form an amphoteric oxide? (1)
(a) Na (b) Ca
(c) Al (d) Cu
Q.10. The correct sequence of anaerobic reactions in yeast is (1)

Q.11 Write one equation each for decomposition reaction where energy is supplied in the form of heat, light and electricity. (3)
Q.12 Draw the electron dot structure of ethane and also draw its structural formula. (3)
Q.13. (a)How is a voltmeter connected in the circuit to measure the potential difference between two points? (3)
(b) An electric refrigerator rated 400 W operates 8 hour /day. What is the cost of the energy to operate it for 30 days at Rs 3.00 per kW h?
Q.14 A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω , 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor? (3)
Q.15.Mention the major events during photosynthesis (3)
Q.16 a. Write the balanced chemical equations for the following reactions. (5)
(i) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water
(ii) Zinc + Silver nitrate → Zinc nitrate + Silver
(iii) Aluminium + Copper chloride → Aluminium chloride + Copper
(b) A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.
.Q.17 A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images? Explain both the cases with diagrams. (5)
Q.18 (a) Draw the diagram of human excretory system showing kidney, ureter ,urinary bladder and urethra. (5)
(b) Explain XX-XY type of sex determination in human beings through diagram.
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Answer 1

Answer:

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