1 Class Tenth Ist Term

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SUMMATIVE ASSESSMENT-I, 2015-16 Class – X/ SCIENCE RWSTOL5 Time allowed: 3 hours Maximum Marks: 90

General Instructions: 1. The question paper comprises of two Sections, A and B. You are to attempt both the sections. 2. All questions are compulsory. 3. All questions of Section-A and all questions of Section-B are to be attempted separately. 4. Question numbers 1 to 3 in section-A are one mark questions. These are to be answered in one word

or in one sentence.

5. Question number 4 to 6 in section-A are two marks questions. These are to be answered in about 30

words each.

6. Question numbers 7 to 18 in section-A are three marks questions. These are to be answered in about

50 words each

7. Question number 19 to 24 in section-A are five marks questions. These are to be answered in about

70 words each.

8. Question number 25 to 33 in section-B are multiple choice questions based on practical skills. Each

question is a one mark question. You are to select one most appropriated response our of the four

provided to you.

9. Question numbers 34 to 36 in section-B are questions based on practical skills. Each question is of

two marks.

Section-A

Q. 1 Name two components of central nervous system in Humans. 1

Q. 2 Name the device that helps to maintain a potential difference across a conductor. 1

Q. 3 State one use of glass cover in box type solar cookers. 1

Q. 4 Write the chemical formula of Bleaching powder. How is bleaching powder prepared? 2

For what purpose is it used in drinking water?

Q. 5 On heating copper powder in air the surface of copper powder becomes coated with

black CuO. How can this black coating be converted into brown copper? Write chemical

equation for the reaction that occurs during the colour change.

2

Q. 6 (i) Write the balanced chemical equation for the process of photosynthesis.

(ii) when do the desert plants take-up carbon dioxide and perform photosynthesis?

2


Q. 7 Balance the following chemical equations. Write the symbols of physical states of all the

reactants and the products:

(i) Heat

3 2KCIO KCI O

(ii) 2 3 4 2Fe H O Fe O H

3

Q. 8 List the raw materials needed for the manufacture of baking soda. Write the balanced

chemical equation for this. What happens when baking soda is heated? Write chemical

equation.

3

Q. 9 You are given samples of three metals – sodium, magnesium and copper. Suggest any

two activities to arrange them in order of their decreasing reactivity.

3

Q.10 (a)Mention two observations which you will make on heating ferrous sulphate crystals

in a boiling tube.

(b) On placing a zinc plate in copper sulphate solution, it was observed that the zinc

plate develops holes after a few days. Give chemical equation to explain this.

(c) Silver chloride turns grey when exposed to sunlight. Give chemical equation to

explain it.

3

Q.11 (a) state two functions of bile juice.

(b) Differentiate between the functions of enzymes pepsin and trypsin.

3

Q.12 Give reason to explam why endocrine glands release their secretions into the blood

directly.

3

Q.13 Write three points of difference between photosynthesis and respiration. 3

Q.14 A current of 5 amperes is passed through a conductor of 12 ohms for 2 minutes.

Calculate the amount of heat produced.

3

Q.15 (i) Will the galvanometer (G) show any defalcation when a constant current flows in

coil A.

(ii) Will the galvanometer show any deflection when current in coil A is changed with

the help of rheostat?

(iii) Will there be any change I n deflection if the current in the coil A is changed at a

faster rate? Explain your observation in each case.

3


Q.16 For the current carrying Solenoid as shown below, draw magnetic field lines and giving

reason explain that out of the three points A, B and C at which point the field strength is

maximum and at which point it is minimum.

3

Q.17 On returning home, Neha, a IXth std. Student noticed that her brother Naresh, was

watching T.V in the afternoon with all the lights and tans on. She noticed that the

windows were closed and curtains were drawn, which made the room dark, so, Naresh

had put on the lights. She calmly opened the window drew the curtains aside, which

illuminated and aerated the room. Then she made Naresh put off the lights and made

him understand the reason behind her action. (Assume that they are getting electric

supply from Thermal Power Plant).

(a) List two values exhibited by Neha.

(b) Explain how she tried to give same values to her brother.

3

Q.18 List any three advantages of biogas as a source if ebergy. 3

Q.19 (a) In a tabular form write the colours of the following indicators in presence of acid

and base:

Litmus solution, phenolphthalein solution, methyl orange solution.

(b) Classify the following given solutions A and B in acidic and basic, giving reason.

Solution A : [H ] [OH ]

Solution B : [H ] [OH ]

5

Q.20 Write the electronic configuration of magnesium (atomic no.12) and oxygen (atomic

no.8) and explain the formation of magnesium oxide by electrons transfer of State the

type of bond formed. Explain with reason two physical properties of compounds

formed by this bonding.

5

Q.21 With the help of a labeled diagram explain the general scheme to illustrate how

nervous impulses travel in the body.

5

Q.22 With the help of a circuit diagram prove that when a number of resistors are connected

in series, the equivalent resistance of the combination of resistors is equal to the sum of

the individual resistances of the resistors.

Calculated the equivalent resistance of the combination of three resistors of 5 , 10

and 30 joined in parallel.

5

Q.23 (a) What is a magnetic field? How is the direction of magnetic field at a place 5


determined

(b) State the rule for the direction of magnetic field produced around a current carrying

straight conductor. Draw the pattern of this field.

Q.24 (a) Name the effect of electric current which is utilized in the working of an electrical

fuse.

(b) How is a fuse connected in a domestic circuit?

(c) Draw a schematic labeled diagram of domestic circuit which has a provision of a

main fuse, meter, one light bulb and a switch/socket.

5

Section-B

Q.25 Remain mixed one drop of universal indicator with one drop of given solution and

found that a red colour is produced, pH of the solution would be in the range of :

(a) 0-3 (b) 4-6 (c) 6-8 (d) 8-10

6

Q.26 Observe the following figures and choose the correct option given below:

(a) pH of A,B and C are equal

(b) pH of A is greater than pH of B and C

(c) pH of C is greater than pH of A and B

(d) pH of B is greater than pH of A and C

1

Q.27 A student takes some zinc gargles in a test tube and adds dilute hydrochloric acid to it.

He would observe that the colour of the zinc granules changes to:

(a)Brown

1


(b) White

(c) Yellow

(d) Black

Q.28 An iron nail was kept immersed in aluminum sulphate solution. Correct observation

made after half an hour, would be.

(a) the colorless solution changed to green.

(b) a grey coating was deposited on iron nail.

(c) the iron nail be4came red, the colorless solution remained colorless.

(d) the solution remained colorless and no deposition observed.

1

Q.29 A few pieces of granulated zinc were added to copper sulphate solution in a test tube.

After an hour, the colour of the solution changed form-

(a) light green to blue

(b) light green to colorless

(c) blue to light green

(d) blue to colorless

1

Q.30 Two resistances are connected in series as shown in the diagram.

The potential difference across 12 resistor will be :

(a) 6 V (b) 2.4 V (c) 2.8 V (d) 12 V

1

Q.31 A student uses a battery of adjustable voltage 0-6 V. She has to perform an experiment

to determine the equivalent resist5ance of two resistors when connected in parallel using two resistors of value 3 and 5 . The best choice of combination of voltmeter and

ammeter to be used in the experiment is :

(a) Ammeter of range 0-5A and Voltmeter of range 0.10V

(b) Ammeter of range 0-5A and Voltmeter of range 0-5V

1


(c) Ammeter of range 0-2A and Voltmeter of range 0-10V

(d) Ammeter of range 0-5A and Voltmeter of range 0-2V

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1 Class Tenth Ist Term