Gujarat Board Class 9 Science Sample Papers 2005


Gujarat Board Sample Papers 2005 for Class 9 Science

Science – 2005

General Instructions:

The question paper comprises two Sections, A and B. You are to attempt both the Sections.
The candidates are advised to attempt all the questions of Section A separately and Section B separately.
All questions are compulsory.
There is no overall choice. However, internal choice has been provided in some questions.You are to attempt only one option in such questions.
Marks allocated to every question are indicated against it.

                                                     SECTION - A

Q. 1. Classify the following reactions into slow and fast reaction :

Reaction between an acid and a base, Rusting of iron. (1marks)

Q. 2. Give the names of the functional groups

(i) — CHO
           |
(ii) — C=O 1

Q. 3. What is a Galaxy ?(1marks)

Q. 4. What is the S.I. unit of electric potential ? (1marks)

Q. 5. (a) Give Arrhenius definition of an acid and a base.(1 marks)

(b) Choose strong acid and strong base from the following :
CH3COOH, NH4OH, KOH, HCl. 2

Q. 6. What is Tollen’s reagent ? What would you observe on heating Tollen’s reagent with formalin in a test tube ? (2 marks)

Q. 7. Distinguish between polar and equatorial orbits for artificial satellites. Illustrate the two orbits on a diagram.( 2 marks)

Q. 8. What is the role of a catalyst in a chemical reaction ?(1 marks)

Q. 9. Which class of compounds gives a positive Fehling’s test ?( 1 marks)

Q. 10. Approximately how many stars are there in the Milky Way ? (1 marks)

Q. 11. What is meant by the statement, “Potential difference between points A and B in an electric field is 1 volt.” ?( 1 marks)

Q. 12. State the ‘Law of Chemical Equilibrium’. Write an expression for the equilibrium constant (K) for the reaction, (2 marks)
N2 (g) + 3H2(g) 2 NH3 (g) + 92 kJ

Q. 13. Name the organic acid present in vinegar. Write a chemical equation which represents the commercial method for the preparation of this acid from methanol.( 2 marks)

Q. 14. Distinguish between ‘artificial’ and ‘natural’ satellites. Why are artificial satellites called “eyes in the sky” ? (2 marks)

Q. 15. An electric lamp is marked 100 W, 220 V. It is used for 5 hours daily. Calculate
(i) its resistance while glowing.
(ii) energy consumed in kWh per day. (2 marks)
        
Q. 16. The pH values of three solutions A, B and C having equal molar concentration are respectively 2.0, 7.0 and 13.0 at 298 K. Which of the three solutions represents an acid solution ? (1 marks)

Q. 17. Write the chemical formula of simplest ketone. (1 marks)

Q. 18. Why is our galaxy called ‘Milky Way’ ? (1 marks)

Q. 19. If the distance between two electric charges is doubled, how much will the force exerting
between them change to ?( 1 marks)

Q. 20. State four characteristic features of ‘Dynamic Equilibrium’. (2 marks)

Q. 21. What is Fehling’s reagent ? What would you observe on heating formalin with Fehling’s reagent in a test tube ? (2 marks)

Q. 22. Distinguish between a ‘geosynchronous’ and a ‘polar’ satellite. What is the usual time period of a (2 marks)

(a) geosynchronous satellite ?
(b) polar satellite ?

Q. 23. An electric heater is used on 220 V supply and takes a current of 3.4 A. Calculate (i) its power and (ii) its resistance, when it is in use. (2 marks)

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