Science -2mark,3 mark and 5 marks question(Class 10th)2021

 Science Questions 

2 marks question.

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1. Gold is very precious metal.Pure gold is  very soft ,therefore is not suitable for making jewellery.It is alloyed other silver or copper to make hard but sometime jewelllers mix a large quantity of copper and silver and gold to earn more profit.

i)What precaution should you take,while purchasing gold jwellery.

ii)Why does government ingest on purchasing hallmarked jewellery.----2marks

2.An alkali metal A gives  a compound B molecular mass -40 on reacting with water.The compound B gives soluble compound C on treatment with aluminium identify A,B and C and give the reaction involved.----------------2mark 

3.Differentiate between the following on the basis of what is given in bracket.

i)Lymphocytes and neutrophils(structure of nucleus).

ii)Plasma and serum.--------------2 marks.

23.Solution A gives pink colour when a drop of phenolphthalein indicator is added to it.Solution B gives red colour when a drop of methyl orange is added to it.What type of solution are A and B and which one of the solution A and B will have higher PH value.

-------------2marks.

4.if two resistors of resistance 5 ohm and 10 ohm respectively are connected to a battery of EMF 6 volt, then determine the value of the total resistance and current in the circuit when they are connected in:

i)parallel combination

ii)Series combination.-------------2marks

5. Give reasons.

i) In mammals separation of oxygenated and deoxygenated blood is necessary.

ii) Arteries form capillaries.-------2marks

6.From where do the following blood vessel carry blood.

i)Hepatic vein.

ii)Hepatic portal vein----------2marks.

7.i)Why does the sky appear dark instead of blue to an astronaut.

ii)Why does the sun appear reddish early in the morning.

3 marks questions

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8.Explain the of carpel with the help of labelled diagram.---------3marks

9.Obtain expression for the heat produced in a conductor of resistance R when current I is flowing through it.---------3 marks

10.The flow of current in a circular wire creates a magnetic field at its centre.How can the existence of this field be detected ?state the rule which helps to predict the direction of magneticin field.---------3marks.

11.i)Draw a ray diagram to show the refraction of light through a glass slab and mark an angle of refraction and lateral shift suffered by the ray of light while passing through the slab.

ii)In refraction of light through a rectangular glass slab, the emergent ray is parallel to the direction of the incident ray.Why?

iii)A ray of light normally on the surface of transparent glass slab.Draw ray diagram to show its path.-------3marks

12.i) State mendel's law of dominance.

ii)A pure tall plant (TT) is crossed with pure dwarf plant(tt).Draw punnet square to show.

a) F1 generation.            

b) F2 generation.

iii)Give phenotypic and genotypic ratio of F1 and F2 generation.----------3marks.

13.Write the mittal formula of plaster of Paris.How is it prepared? How is it different from gypsum?-----------3marks.

14.Explain the nature of the covalent bond using the bond is Ch3Cl.---------3marks

15.i)Write full form of N A D P and B C  G.

ii)Explain the terms antibiotic .Give an example of an antibiotic .

iii)State any function of World Health Organization.----------3 marks

5 marks questions.

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16.'The sexual act always has the potential to result in pregnancy.'What approach would you used to prevent pregnancies?

17.What event would occur for fertilization to take place in humans? Also,incorporate the post-fertilisation changes.

18.With reference to the first three periods of the modern periodic table ,answer the question given below:-

i)Write the formula of the sulphate of the element with atomic number 13.

ii) Consider the following elements :-

Ca,O,Ar,S,Be and He.

Which of the above elements would you expect to be

a)In II group of the periodic table.

b)In group VI of the periodic table.

iii)How many prawns are present in the valence shell of element with atomic number 18.

iv)What is the electronic configuration of the element in the third period which gain one-electron to change into anion?

v)What type of bonding will be present in the oxide of the element with atomic number 1?

vi)Fill in the blanks

The atomic size ........as we move from left to right across period because the..........increases but the............. remains the same.

19.Answer the following question based on the diagram given below:-

I)Explain working of electric motor.

II)In what ways,this simple electric motor is different from commercial motor.

III)How the speed of rotation of motor be increased?

20.I) Justify the following statements.

a)Two magnetic field lines never intersect each other.

b) Magnetic field lines are closed curves.

II) A permanent electromagnet using a solenoid is as shown below:-

Under what condition permanent electromagnet is obtained,if a current carrying solenoid is used?

III)

From the above figure, identify the rule and state one application of this rule.

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Thanks very much

By Anuranjan Gadekar

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