X-Science Practisce set 1


Sample Paper – 2010

Class – X
Subject –
Science

  

Time : 2 hr                                                                                           MM:60

General Instructions:

a.                  All questions are compulsory.

b.                  Question numbers 1 to 8 are very short answer type questions. These questions carry one mark   each.

c.                   Question numbers 9 to 14 are short answer type questions and carry two marks each.

d.                  Question numbers 15 to 19 are also short answer type questions and carry three marks each.

e.                   Question numbers 20 to 22 are long answer type questions and carry five marks each.

 

SECTION A

 

1.     Why do we apply paint on iron particles?

2.     Name two metals which are found in nature in the Free State?

3.     Ethane, with the molecular formula C2H6 has ______covalent bonds.

4.     Define the unit of current.

5.     Define 1 dioptre of power of a lens.

6.     Draw magnetic field lines around a bar magnet.

7.     State Fleming left hand rule.

8.     What are the advantages of nuclear energy?

9.     Why does the colour of copper sulphate solution change when an nail is diiped in it?

10.                        Explain the meaning of malleable and ductile?

11.                        State three ways to prevent the rusting of iron?

12.                        What is hydrogenation? What is its industrial application?

13.                        Nitrogen (atomic number 7) and phosphorus (atomic number 15) belongs to group 15 of periodic table. Write the electronic configuration of these two elements. Which of these will be electronegative and why?

14.                        An object is placed at a distance of 10cm from a convex mirror of focal length 15cm.Find the position and nature of the image?

15.                        Explain the following :

a)     Why is the tugsten used almost exclusively for filament of electric lamps?

b)    Why are the conductors of electric heating devices, such as bread toasters and electric irons, made of an alloy rather than a pure metal?

c)     How does the resistance of a wire vary with its area of cross section/

d)    Why is the series arrangement not used for domestic circuits?

e)     Why are the copper and aluminum wires usually employed for electricity transmission?

16.                        Explain the following:

a)     States differentiate between metal and non-metal on the basis of their chemical properties.

b)    Why decomposition reactions are called the opposite of combination reactions? Write equations for these reactions.

c)     Why the respiration is considered an exothermic reaction? Explain.

SECTION B

17.                        Name the digestive enzymes?

18.                        What is the role of the brain in reflex action?

19.                        What are fossils?

20.                        What factors could lead to the rise of a new species?

21.                        How does chemical co-ordination occur in plants?

22.                        How does binary fission differ from multiple fission?

23.                        What is the rate of saliva in the digestion of food?

24.                        How the amount of urine is produced regulated?

25.                        Describe the structure and functioning of nephrons?

26.                        What are the trophic levels? Give an example of food chain and state different trophic levels in it.

27.                        Answer the following:

a)     Why should we conserve forests and wildlife?

b)    What would be the advantages of exploiting resources with short term aims?

c)    State 3 R’s.

 

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