Rajasthan Board Secondary Examination 2014– Science Paper

Posted on by

SECONDARY EXAMINATION, 2014

SCIENCE

Time: 3¼

Max. Marks : 80

Section – A

1. Out of sodium, chlorine and silicon which one is metalloid? 1

2. What is the value of pH for a neutral solution? 1

3. Write the name of acid secreted from sting of ant. 1

4. Which type of fission is found in Plasmodium? 1

5. What is the main factor of sharply dropping the amount of ozone in the atmosphere? 1

6. Draw a labelled diagram of an electric generator. 1

7. What happens on connecting too many appliances at a time to a single socket ? 1

8. A charge of 300 C is drawn by a filament of an electric bulb for 5 minutes. Find the amount of electric current flowing through the circuit. 1

Section – B

9. (a) Give one example of redox reaction.

(b) Draw the labelled diagram of electrolytic decomposition of water. 1 + 1 = 2

10. Which type of energy sources are fossil fuels ? Write down any two names of fossil fuels. 1 + 1 = 2

11. Write any two events occurring during the process of photosynthesis. 1 + 1 = 2

12. What are homologous and analogous organs ? Write their examples.

13. What is vegetative propagation ? Write one advantage of vegetative propagation. 1 + 1 = 2

14. (i) Why does the sky appear dark to an astronaut ?

(ii)    Which part of an eye adjusts the size of its pupil ?       1 + 1 = 2

Section – C

15. (a) Give the name of the gas evolved when sodium hydroxide reacts with zinc Write the equation also.

(b)     Which is used in the following ?

(i)     To make drinking water free from germs

(ii)    For making tasty crispy Pakoras in kitchen

(iii)  To remove permanent hardness of water

(iv)   For making toys and decorative materials.          1 + 2 = 3

16. (a) What is displacement reaction ?

(b)     Identify A in the following reactions :

(i)         Zn + CuSO 4 → A + Cu

(ii)     Na 2SO 4 + BaCl 2 → A + 2 NaCl.                           1 + 2