Attempt all the questions.

Physics

1. (a) The body weighs more at pole than equator. Why? The mass of the planet is 6 x10²⁴ kg and its radius is 6400 km. What is the weight of 50kg mass standing on that planet? (G = 6.67x10 ^–11 Nm²/kg²)

                                                                                    [1+2+1=4]

 (b) Nuclear Energy is also considered an alternative source of energy. Why? Show the complete thermonuclear reaction taking place on the surface of sun and write its two conditions. [1+2.5=3.5]

2. (a) Define Pascal’s law. If weight of a body in air is 20 N and in a liquid is 10N, find the weight of displaced liquid and mass of that liquid.  [1+2.5=3.5]

 (b) A Ship made of iron can easily float in water. Why? An ice block of dimension 60cm x 30cm x 20cm is placed in water. What is the height of ice above the surface of water if the density of ice and water is 0.9gm/cm³ and 1gm/cm³respectively? [1+3=4]

3. (a) Define Specific Heat capacity. Write the SI unit of temperature. How much heat is required to raise the temperature of 10kg mass of a substance by 10°C when its specific heat capacity is 2100 J/kg°C? [1.5+2=3.5]

  (b) If an object is kept between F and 2F of a convex lens, where is the image formed? Draw a ray diagram to show the formation of image. Write its characteristics also. [2+2=4]

4. (a) Which type of transformer is given in the picture? Write any one application. Calculate the voltage produced in secondary coil.

 [1+2 = 3]

  (b) State the Faraday’s law of electromagnetic induction. Why are inert gases filled in filament lamp? Write two differences between filament lamp and fluorescent lamp. [1.5+1+2 = 4.5]

Chemistry

5. (a) The electronic configuration of two elements is given below. Answer the following questions with the help of given electronic configuration.  [1+1+1=3]

X: 2. 8. 1

Y: 2. 8. 7

(i)   Name the elements ‘X’ and ‘Y’

(ii) Write down the electronic configuration of these elements (s,p,d,f subshell).

(iii) In which block of the periodic table do these elements belong to?

 (b) Draw a labeled diagram to show the laboratory preparation of Carbon dioxide. Write the name with structural formula of the compound formed due to the displacement of two hydrogen atoms of ethane with two (OH) radicals. Give an example of decomposition reaction.  [2+1.5+1 = 4.5]

6. (a) Which metal is obtained from haematite? Write the balanced chemical equation for the reaction between conc. hydrochloric acid and that metal. Specify whether the compound of the metal formed by this reaction is acid, base, or salt. [0.5+2+ 0.5= 3]

(b) How is ordinary glass prepared? Which metallic oxide is used to prepare black glass? Name any Phosphorous containing chemical fertilizer. Differentiate between PVC and Bakelite in two points. [1.5+1+2 = 4.5]

Biology

7. (a) What is taxis? Why pancreas is known as mixed gland? Identify the types of taxis/ tropism of the following.

(i)  Euglena moves towards light.

(ii) Pollen tube grows towards ovule.

(iii) Aerobic bacteria move towards oxygen.

(iv) Root grows towards water.  [1+1+2 = 4]

(b) In which cell of the blood does HIV affect? Write any two causes of AIDS. Why are arteries thicker than veins? If a person has blood pressure 140/ 100 mm Hg what does it mean? Write briefly. [0.5+1+1+1 = 3.5]

8. (a)  Identify the stage shown in the following diagram and mention its two important features. Write two importance of meiotic cell division. [0.5+1+2 = 3.5]

(b) What is meant by alternation of generation? Explain it taking an example of a fern plant. State any two differences between primary and secondary mycelium in the life cycle of mushroom. [2+2 = 4]

9. (a) Maize  ,  Deer   ,Tiger

What is food web? Classify maize and write down the special features of it. Describe the consequences that may occur if all the tigers are killed in that food chain. [1+2+1.5 = 4.5]

(b) What is variation? Draw a chart to show the results obtained in the first and second filial generation after crossing a mouse having black color (BB) and white colour (bb). Also write the phenotypic and genotypic ratio of the offspring in F₂ generation. [1+2 = 3]

Astronomy and Geology

10. (a) In which period did the dinosaurs evolve and in which period did they become extinct? How does an acid rain occur due to industrial gases? [1+2 = 3]

(b) A comet is not actually a star. Give two evidences in favor of this statement. Classify the following heavenly bodies as satellite, comet, asteroid, galaxy and constellation. [2+ 2.5=4.5]

    i. Enke                            ii. Andromeda               iii. Orion           

iv. Europa                      iv. Ceres

SUDESHA HIGH SCHOOL

Class: X                                                                                 F.M: 75

Subject: Science                   Time – 2 hrs  15 mins          P.M:30

Candidates are required to give their answers according to the given instructions.

Group A - Physics

      1a.Write down any two differences between weight and mass. The gravitational force between two bodies is 400 N. If the distance between the centres doubled, find the gravitational force between them. (2+2=4)

      1b.Write down any two advantages and one disadvantage of hydro electricity. Write down any two effects that can be obtained from energy crisis. (1.5+2=3.5)

      2a.State Archimedes' principle. Why an object immersed in liquid? Knife cut well, when it is sharp, why?    (1+1+1.5 = 3.5)

      2b.Define upthrust. Why is it difficult to hold a school bag having a strap made of a thin string? Calculate the pressure exerted at the bottom of a cubical tank of length 1 meter.(g= 9.8m/s²)(1+1+2 = 4)

      3a.What is 1 calorie? Specific heat capacity of water is 4200j/kg◦c. what is the mass of water   which loses 25,20,000J heat energy from 34◦c of its temperature reduced into 4◦c?  In  what temperature does mercury freeze? (1+2+0.5=3.5)

      3b.What is focal length? Show an image by a ray diagram of an object kept at 6cm in front of the convex lens. This lens has 3cm of focal length. Also, find out the magnification of the image. ( 1+2+1=4)

      4a.What is a fuse? Draw a circuit diagram to glow two bulbs of 3 volt with full brightness with the help of two cells of 1.5 volt each. What is the name of the type of connection?  

 ( 1+2.5=3.5)

4b.What is motor effect? Name the metal which is used to make filament wire? A circuit with 220V is supplied with a fuse of 5A. How many bulbs of 100W can be safely used in the circuit? (1+1+2=4)

Group B - Chemistry

 5a.Answer the following questions on the basis of electronic configuration of two elements are given below.

A -1S² 2S² 2P⁶ 3S²

            B – 1S² 2S² 2P⁴

(i)Write down the molecular formula of the compound form by combination of these two elements.

 (ii)What happen when we kept some drops of water in that compound? What kinds of chemical reaction is this? (1+1.5+0.5+3)

                     

   5b.Which gas is produced when a mixture of ammonium chloride and calcium hydroxide is heated? Show with the help of labeled diagram how is this gas collected in laboratory. Write structural formula of diethyl ether. Give one use of it. (0.5+2.5+1.5=4.5)

6a.Which metal do we get from argentite ore. Show the balanced chemical equation for the reaction when silver reacts with concentrated sulphuric acid. Write any two differences between base and alkali.    (0.5+2+2=4.5)

6b.Write the main two raw materials required for the manufacturing of cement. Organic fertilizers are better than chemical fertilizers. Justify with any two suitable reasons. [1+2=3)

Group C - Biology

7a. Virus show non living behavior until it comes to living cells. Write the one function of the following parts.

              i)  Motor nerve

            ii)  Sensory nerve

           iii)  cerebro-spinal fluid (1+3=4)

7b.What is hemoglobin? In which part of the blood does it found? Write the function of plasma. Valves are found in veins. Why?  (1+0.5+1+1=3.5)  

8a.Which stage of life cycle of fern is shown in the given diagram ? What is alternation of generation in the life cycle of fern? What are diploid chromosomes? Why meiosis is called reduction division?  (0.5+1.5+1+1=4)

8b.What is asexual reproduction? Potato is planted by making many pieces. Why? What is tissue culture? (1.5+1+1=3.5)

 9a.Biotic factors of an ecosystem are classified into how many groups? Name them. Write the scientific name of human being. Classify maize plant. (1.5+1+1=3.5)

 9b.Why did Mendel choose pea plant for his experiment? Give any two reasons. Write two differences between DNA and RNA. (2+2=4)

Group – D Astronomy and Geology

10a.Explain in brief about the origin of the earth on the basis of Jean and Jersey’s hypothesis. Name the periods in which fish and dinosaurs were evolved. Write down any two effects of greenhouse effect. (1.5+ 1+ 2=4.5)

10b.Generally meteors cannot reach on the earth’s surface, why? Write down any two differences between a white dwarf star and supernova.     (1+ 2=3)

THE END

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