Half Yearly Examination (2019-20)

Class-6

Subject: Science

Time: 2:30hr

Max.marks: 100

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Quarterly Examination (2021-22)

Class 10th Sublect - Science Time  3Hrs Max Marks 80

Q1 Choose and write correct option: (1*6=6)

1. Which of the following correctly represents a balanced chemical equation?

A. Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g)

B. 3Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g)

C. 3Fe(s) + H2O(g) → Fe3O4 (s) + H2(g)

D. 3Fe(s) + 4H2O(g) → Fe3O4(s) + H2(g)

2. The chemical reaction between copper and oxygen can be categorized as:

A. Displacement reaction

B. Decomposition reaction

C. Combination reaction

D. Double displacement reaction

3. The chemical formula of lead sulphate is -

(A) PbSO. (B) Pb(SO4)2 (C) Pb,SO, (D) Pb(SO4)3

4. Which one of the following medicines is used for treating indigestion --

(A) Antibiotics (B) Analgesic (C) Antacid (D) Antiseptic

5. Asolution turns red Litmus blue. Its PH is likely to be-

(A) 10 (B)1 (C) 4 (D)5

6. Acidity or basicity can be determind by

(A) Ph scale (B) Kilometer (C) calorie (D) Cm Scale

Q2 Fill ups ( 1*7=7)

1 The metal which is kept in kerosene is ....

2. The metal which can be cut by Knife .....

3 .The Highest reactive metal......

4. The least reactive metal-.....

5. The corrosion of iron is called.......

6 .Water is a---- oxide

7. Methyl orange is a------ indicator

Q3  Match the column : (1*6=6)

1. Pulmonary artery.                   oxygenated blood

2. Transportation of food.          Nephron

3. Kidney.                                        Chlorophyll

4. Autotropnic nutrition.                 Excretion

5. Excretation                                    phloem

6 Pulmonary vein.              deoxygenated blood

Q4. Write answer in One world (1*7=7)

1. What is the space between two Nerve cells called 

2. involuntary actions in the body is controlled by

3.  name the fundamental unit of nervous system

4.  name the three parts of the brain

5.  which part of the brain controls posture and balance of the body

6. Define 1 kilowatt hour

7. Define 1 Joule

Q5. Tick true or false (1*6=6)

1. non metals are electropositive

2. in Modern Periodic Table the atomic size increases down the group

3 .The Hind brain is the main thinking part of the brain 

 4. metals and alloys have very low resistivity

5. HCL is a weak acid

 6. turmeric turns dark brown in colour in basic medium

 Q 6 ------ 2 mark questions    (any 10)

1. What do you mean by a precipitation reaction define with example

2. Oil and fat containing food items are flushed with nitrogen ?why

3. Explain the meaning of malleable and ductile 4. why do ionic compounds have high melting points

5. explain corrosion with the help of example

6. What is modern periodic law

7.  write any two limitations of newlands law of Octave

8. Describe double circulation in human beings why is it necessary

9. State Ohm's law

10. an electric iron of resistance 20 ohm takes a current of 5A calculate the heat developed in 30 second.

11. Define electric current and write its SI unit

12. What does an electric circuit mean

13. Define 1 kilowatt hour and electric power

Q 7 ----3 marks question (any four)

1. Define exothermic and endothermic reaction with example

2.  what is Redox reaction explain with example 3. why is respiration considered an exothermic reaction explain

4.  explain the factors affecting the rate of reaction

5.  Write the balanced equation for the following chemical reactions

1- Hydrogen + chlorine --------> Hydrogen chloride

2- Barium chloride + Aluminium Sulphate -------> Barium Sulphate + Aluminium chloride

3. Sodium + Water --------> Sedium hydroxide + Hydrogen

6. Write equation for (a)combination reaction (b)displacement reaction (c) double displacement reaction

7. why is photosynthesis considered an endothermic reaction . explain

Q 8 ---4 marks question (any four)

1. Explain the mechanism of cleaning action of soap

 2. what are hydrocarbons how many types of Hydrocarbons are there explain

3. Write any four differences between acid and base on the basis of chemical properties 

4. what is gypsum what will happen if it is heated at hundred degree Celsius.

5. Draw a well labelled diagram of human excretory system

6.  write any four function of liver

7. Differentiate aerobic and anaerobic respiration

8. Write any four difference between soap and detergent

9. What will happen when( write equation also)

(a)sodium react with sulfuric acid 

(b)zinc react with sodium hydroxide 

(c)calcium oxide react with water

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