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Friday, October 10, 2014

Science and Technology March – 2014 Board Paper with Complete Solution.

Section A

Q1. A. (a) Rewrite the following statements with suitable words in the blanks: (3)

(i) Very fine particles mainly scatter ___________ coloured light. (blue)

(ii) The element eka – silicon in Mendeleev's periodic table is known as ______________ in the modern periodic table. (Germanium)

(iii) Sodium or Potassium salt of higher fatty acid is termed as ______________ (Soap)

(b) State whether the following statements are True or False (2)

(i) CuSO4(aq) + Zn(s) → ZnSO4(aq) +Cu(s)­ is an example of decomposition reaction. (False)

(ii) Magnetic lines of force are closed continuous curves. (True)

Q1. (B) Rewrite the following statements by selecting the correct options: (5)

(i) The reddish brown deposit formed on iron nails kept in a solution of copper sulphate is

(a) Cu2O

(b) Cu

(c) CuO

(d) CuS

(ii) What will be the change in the current, if the potential difference is kept constant and the resistance of the circuit is made four times?

(a) It will remain unchanged

(b) It will become four times

(c) It will become one – fourth

(d) It will become half

(iii) A ray of light strikes the glass slab at an angle of 500. What is the angle of incidence?

(a) 500

(b) 250

(c) 400

(d) 1000

(iv) From which plant is litmus paper or litmus solution obtained?

(a) Moss

(b) Rose

(c) Hibiscus

(d) Lichen

(v) If the equivalent resistance is to be increased, then the number of resistances should be connected in:

(a) series

(b) parallel

(c) mixed arrangement

(d) none of the above

Q2. Answer any Five of the following: (10)

(iii) Differentiate between Primary Pollutants and Secondary Pollutants.                     

Q3. Answer any Five of the following: (15)

Colour Change

No Change

Methyl Orange



Q4. Attempt any One of the following. (5)

 Section B

Q5. (A) (a) Find the odd one out: (2)

(i) Pancreas, Gall bladder, Glomerulus, Liver.

(ii) C2H4, C4H10, C3H8, CH4.

(b) Match the following: (3)

Column A
Column B
(i) Stigma
(a) Neuron
(ii) Pepsin
(b) Carpel
(iii) Dendrites
(c) Protein

(d) Stamen

Q5. (B) Rewrite the following statements by selecting the correct options: (5)

(i) iron is

(a) more reactive then Zinc.

(b) more reactive than Aluminium.

(c) less reactive than Copper

(d) less reactive than Aluminium.

(ii) ________________ is a mode of asexual reproduction.

(a) Cloning

(b) Budding

(c) Pollination

(d) Germination

(iii) The percentage of water absorbed by raisins is calculated on dividing ___________ by initial weight.

(a) final weight

(b) increased weight

(c) decreased weight

(d) none of the above

(iv) Cellular respiration takes place in

(a) lysosome

(b) chlorophyll

(c) mitochondria

(d) ribosome

(v) ______________ is not essential for photosynthesis.

(a) Oxygen

(b) Carbon dioxide

(c) Light

(d) Chlorophyll.

Q6. Answer any FIVE of the following: (10)

Q7. Answer any FIVE of the following: (15)

Q8. Attempt any one of the following.  (5)

(iv) Draw a diagram depicting sex determination in human.