www.gbshse.gov.in Goa Board of Secondary and Higher Secondary Education Tenth, 10th Std, SSLC Model Question Paper : Science

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Document Described : Goa Board of Secondary and Higher Secondary Education
MODEL QUESTION PAPER
MARCH/APRIL, EXAMINATION 2008
SCIENCE
CLASS X (THEORY)
TIME : 3 HOURS Max . Marks: 80

http://gbshse.gov.in/
http://gbshse.gov.in/documents/MODEL...%20SCIENCE.doc

General Instructions:

1.The question paper comprises of 2 sections A and B. You have to attempt both the sections.
2.All questions are compulsory.
3.Each section consist of 4 questions sets carring 10 marks each.
4.There is no overall choice however internal choice has been provided in two questions of 3 marks category and two questions of 4 marks category in section A and B. You are to attempt only one option in such questions.
5.Begin each set on a fresh page.
6.Figures to the right indicate full marks.

SECTION A
Set 1.0

1.1: Select the most correct alternative given below each statement and write the completed statement.1
A:A solution turns red litmus paper blue then its pH value should be ______
• Equal to 7
• Less than 7
• More than 7
• Between 0 to 7.
B: A solution which is used as a food ingredient is not allowed to put in a copper vessel. Then the solution should be -------------
• An acid
• An alkali.
• A salt
• Milk

1.2: What do you mean by an endothermic reaction?1

1.3: Write any two limitations of Mendeleev’s Periodic Table.1

1.4: You are given two fuse wires A and B with current rating 5 A and 15A respectively.
A: Which of the two would you select for use with 3000 W, 220 V electric geyser?
B: Justify your answer.2

1.5: Combination reaction is said to be opposite of decomposition reaction. Justify it with examples and reactions.2

1.6: A person suffers from stomach pain and irritation. Doctor prescribes him tablets containing a mixture of Magnesium and Aluminium hydroxides.
Answer the questions:3
A. What is the cause of stomach pain and irritation?
B. How will the tablets affect the cause?
C. Name any other easily available salt that can be used in place of the tablets prescribed by the doctor.
OR
1.6 : A white powder which smells of chlorine readily loses chlorine on exposure to air. It is also used for disinfecting drinking water.
Answer the questions:3
A. Identify white powder compound.
B. Write its molecular formula.
C. State another use of the compound.