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
(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?
(iv) From which plant is litmus paper or litmus solution obtained?
(v) If the equivalent resistance is to be increased, then the number of resistances should be connected in:
(c) mixed arrangement
(d) none of the above
Q2. Answer any Five of the following: (10)
(ii) Find the resistance of a conductor if 0.24 A current ispassing through it and potential difference of 24 V is applied across it.
Q3. Answer any Five of the following: (15)
(iii) Methyl orange is used as an indicator. It shows colourchanges in acid, base and neutral substances. Tabulate your results as follows:
Q4. Attempt any One of the following. (5)
(ii) With the help of appropriate ray diagram, state the sign conventions for reflection by spherical mirror.
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)
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.
(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
(v) ______________ is not essential for photosynthesis.
(b) Carbon dioxide
Q6. Answer any FIVE of the following: (10)
Q7. Answer any FIVE of the following: (15)
(iv) What doyou mean by DNA? What is the peculiarity of its structure? Name the scientist who put forward the most popular model of DNA.
Q8. Attempt any one of the following. (5)
(iv) Draw a diagram depicting sex determination in human.