Science Sample Paper 2 class 10

 SCIENCE -SAMPLE PAPER

Total marks-24 marks ,                                                               Time:30m

Section -A (1 marks each)

1. The structural and functional unit of kidney.

Or

Write the special functional activity of the ureter.

2.A ray of light passes through a medium of refractive index 4/ 3 ,then find the speed of light ray in medium .(take speed of light in air,c = 3×10^8m/s.

3. From the given elements,which one can lose electrons easily ?Give reason. Potassium or sodium.

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4.If r1 and r2 be the resistance of filament of 40 watt and 60 watt respectively 

operating at 220 volt. Out of r1 and r2,which one is greater.

5.When an object moves closer to a concave lens what happens to the image formed by it shifts?

Or

What is the value of i,if  the angle of incidence i  and refraction r are equal in  a transparen slab?

6. 2 ml of sodium hydroxide(NaOH) solution is added to a few pieces of granulated zinc metal taken in a test tube .Write the equation of chemical reaction.

7.Aluminium reacts with dilute hydrochloric acid slowly in the beginning. Give reason.

Or

Generally no hydrogen gas is evolved when metal react with dilute nitric acid.

8.Two wires of same metal have the same length but their cross- sectional area are in the ratio of 3: 1 . The resistance of a wire 10ohm  .What will be the resistance of other wire?

9. Why sodium is kept immersed in kerosene?

Or

Ionic compound have higher melting and boiling point .Give reason.

10.A solution of a substance x is used for whitewashing ,Name the substance x and its formula and also write the reaction of  the substance x with water.

11.Blood flows from legs to heart against the gravity through the veins.Give reason.

12. Why is the water in deep sea blue in colour?

Or

Why do stars twinkle?

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13.What are the components of transport system in highly organised plants?

Assertion-Reason Type Questions (Q.no.s -14-16)

In each of the following questions, a statement of Assertion is given by the corresponding statement of reason. Of  the statements, mark the correct answer as 

a)If both assertion and reason are true and reason is the correct explanation of assertion.

b)Ifb both assertion and reason are true but reason is not the correct explanation of Assertion.

c) If assertion is true but reason is false.

d) If assertion is false but reason is true.

14.Assertion:-Ammonia is formed when hydrogen and nitrogen combines.

Reason:-it is an exothermic reaction.

15.Assertion:-when a charged particle enters in the direction of a uniform magnetic field then it moves on a straight path without deviation.

Reason:-magnetic force on a charged particle is zero when it moves in the direction of magnetic field.

16.Assertion:-pyruvate is a six carbon molecule.

Reason:-it is prepared in the cytoplasm as the first step of cellular respiration.

Answer Q.no. 17 - 18 contains 5  sub parts each .You are expected to answer any four sub parts in these questions.4 marks each....

17. Following and answer any four question from 17(i) to 17(v)

With the lungs the passage divided into small tubes which finally terminate in the balloon -like structure which are called alveoli.The alveolin provide a surface area where the exchange of gases can take place. The walls of alveoli contain an extensive network of blood vessels.As we breathe in, we life our ribs  and flatten a diaphgram and the chest cavity become large fit.

I) The diagram shows a section through alveolus  and blood capillary.

What are the oxygen concentration in X,Y and Z.

          X          Y .         Z

a)High.        Low .    High   

b)High .       Low.      Low

c)Low .        High.      High

d)Low .        High.     Low

II) Which the following is characteristic of emphysema.

a) destruction of alveolar walls.

b) increase in the growth of lung tissue.

c) inflammation of the walls of the bronchi

d) thickning of the artery walls to the lungs.

III)Chemicals in tobacco smoke lead to breakdown of the elastic tissue in the alveoli. What is the name of this condition.

a)bronchitis.             b)emphysema

c)heart disease          d) lung cancer

IV) What is the percentage of oxygen is expired air when a person is resting?

a)8% .            b)16%

c)12%.           d) 20%

V) What happens during the process of breathing in.? 

External intercostal muscles   Diaphragm

a) Contract .                                    Arches   

b)Contract .                                      Flattens 

c) Relax                                             Arches

d) Relax                                            Flattens 

18. Answer any four question from 18(I) to 18 (V)

18(I)Which is the correct order of reactive series .

a)Mg<Can<Na<K

b)K<Mg<Na<Ca

c)K<Na<Ca<Mg

d)Mg<Can<Na<K

18 II- what is the reaction between quick lime into slaked lime 

a)CaO+CO2--heat----->CaCO3

b)Ca(OH)2-------heat--->CaO+H2O

c)CaO+H2O------------------>Ca(OH)2+heat 

d) C+O2-------heat------->CO2

18 III -Why we wear ornaments of gold and silver.

a) They are expensive, to look rich.

b) They are most reactive.

c) They are least reactive .

d)None of the above.

18 IV- The gas evolved from slaked lime,is ....................in nature.

a) acidic

b)basic 

c) amphoteric 

d) All of these.

18 V- choose the correct match of the following.

A-sodium              (i)Quick lime

B-alumimium .    (ii)Keep in kerosene 

C-calcium.            (iii)wrapping food

A)i,ii,iii.   

B) iii,i,ii

C)ii,iii,i

D)ii,i,iii

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Thankyou so much.

By Anuranjan Gadekar

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