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