2014 10 Lyp Science 19

Topics: Chemistry, Hydrochloric acid, Copper Pages: 7 (1496 words) Published: August 15, 2015
Summative Assessement-1 Examination 2014
Science
Class – X
Time allowed: 3 hours

Maximum Marks: 90

General Instructions:
a)
b)
c)
d)
e)
f)
g)
h)

1.
2.
3.
4.

5.

6.
7.

The question paper comprises of two sections, A and B. you are to attempt both the sections.
All questions are compulsory.
Questions 1 to 3 are one mark question of section A.
Questions 4 to 6 carry two marks each of section A.
Questions 7 to 18 carry three marks each of section A.
Questions 19 to 24 carry five marks each of section A.
Questions 25 to 33 carry one mark each of section B.
Questions 34 to 36 are two marks each of section A..

Section – A
Identify the category in which the organisms using carbon dioxide and water as food are placed.
Define 1 Watt.
Why is a solar cooker painted black from outside?
Name the chemical which is injected into the skin of a person during a) Honey bee’s sting
b) The nettle leaf sting. How can the effect of these stings be neutralized? Rahul has been collecting copper coins and silver coins. One day he observed a green coating on copper coins and a black coating on silver coins. State the chemical phenomenon responsible for these coatings and also write chemical names of each coating. How is our brain double-protected against injuries and shocks? Identify the type of chemical reactions in the following processes: a) Barium chloride solution is mixed with copper sulphate solution and a write precipitate is formed.

b) On heating copper powder in a china dish, the surface of copper powder become black. c) On heating green ferrous sulphate crystals, reddish brown solid is left as residue and a gas having smell of burning Sulphur is evolved.

d) Iron nails when left dipped in blue copper sulphate solution become brownish in colour and blue colour of copper sulphate solution fades away.
e) Quicklime reacts vigorously with water releasing large amount of heat. f) Silver nitrate solution reacts with sodium chloride solution and a white precipitate is formed.

Material downloaded from http://myCBSEguide.com and http://onlineteachers.co.in Portal for CBSE Notes, Test Papers, Sample Papers, Tips and Tricks

8. A) Define the term pH of a solution. The pH of gastric juices of the sample collected from the stomach of two persons A and B were found to be 1 and3 respectively. The gastric juice of which person is more acidic?

B) Name one salt whose solution has pH more than 7 and one salt whose solution has pH less that 7.
9. Define water of crystallization. Explain with the help of an activity that copper sulphate crystals contain water of crystallization.
10. Write chemical equations for the following reactions:
a) A piece of calcium metal is dropped in water
b) Steam is passed over red hot iron
c) Zinc suphide is heated in air
11. Define hormone. Name the hormone secreted by thyroid gland. Write its function why is it advised to use iodised salt?
12. Compare alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.
13. Mention the pathway of urine starting from the organ of its formation. Name four substances which are reabsorbed from the initial filtrate in the tubular part of the nephron. 14. For the current carrying solenoid shown, draw magnetic field lines, and giving reason explain. Out of the three points A, B and C at which point the field strength is maximum and at which point it is minimum.

15. In Faraday’s experiment if instead of moving the magnet towards the coil we move the coil towards the magnet, will there be any induced current? Justify your answer. Compare the two cases.
16. Draw a V-I graph based on the following data:
V(in volts)
1
2
3
4
5
I(in amperes) 0.25 0.50 0.75 1.0 1.25
What would be the value of V/I ratio when the potential difference (V) across the resistor is 3.6V?
17. Nishant went to see a thermal power plant where large amount of fossil fuels are burnt every day, to heat water to produce...
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