Science Paper U.P. Board High School 2012

                                            Science

                                                               

                                                                  (only paper)

                                                            

                                                               [English Version]                        Max Marks : 70
Time : 3 Hrs 15 Min.

Note: Marks of the question are mentioned against them.

Part - A  ( Physics )

1. a) The image due to long sightedness is formed                                 (1)

i. on the retina       ii. in front of the retina          iii. on the back of the retina      iv.  nowhere

b) A current of 2 amp. at 10 volt flows for 1 minute in  a conductor. The value of electrical energy consumed in wire is                                  (1)

i. 5 joule           ii. 10 joule       iii.  20 joule         iv. 1200 joule

c) The unit of intensity of magnetic field is                                      (1)

i.     Newton / Amp-Metre

ii.  Newton - Amp - Metre

iii. Newton - Metre / Ampere

iv. Newton - Ampere / Metre

d) n conducting wires each of 4 ohm resistance are connected in parallel. The equivalent resistance of the combination is :                                       (1)

i. 4n                               ii. 4 / n                                      iii. n / 4                             iv. 4n square

2. a) The focal length of a concave mirror is 10 cm. Where will the image of an object placed at a distance of 20 cm from the mirror be formed ?                  (2)

b) The temperature of a wire increases by 3 degree C by flowing current for some time. How much temperature will increase by flowing double current for the same time ?       (2)

c) Write the expression for produced intensity of magnetic field due to an infinitely long straight current carrying conductor ?                                        (2)

3. a) Define electric potential and write the relation between potential difference and current in a conductor ?                                         (4)

                                                           OR

A current of 4 amp. is flowing in a conductor of length 2 m. The conductor is placed in  a magnetic field of intensity 2.5 Newton / Amp - Metre at an angle of 30 degree. Calculate the magnetic force acting on the conductor.

b) Show by drawing a diagram, the lines of magnetic force in a current carrying solenoid. What will be the effect on placing a soft iron rod inside the solenoid ?          (4)

                 

                                                            OR

 c) What is the use of main fuse in domestic wiring ? Explain  by drawing a suitable circuit.

4. What is the distance of far point of a healthy eye ? A person suffering from short-sightedness can see an object at a maximum distance of 2 m. For correct vision what should be the power of the lens used ? Draw necessary ray diagram.                  (7)

                                                             OR

     Explain construction of a compound microscope Show the formation of the image by drawing a neat ray diagram.           

Part - B (Chemistry) 

     

5. a)  The first member of alkene series is : (1)

i. Methane       ii. Ethane       iii. Ethylene       iv. Acetylene

b) Which of the following reacts with water at ordinary temperature ?   (1)

i. Cu     ii.  Na     iii.  Fe      iv.    Mg

c)  The strong base in the following is :      (1)

i.  Ca(OH)2         ii.  KOH     iii. Mg(OH)2     iv. NH4OH

6. a) Write the names of the compounds in IUPAC system --   (1+1)

i.  CH2 = CH - CH =  CH2

ii. CHC triple bond CH

b) Write the chemical equation of the preparation of baking soda. Also write the effect of heat on it.  (2)

c) The concentration of hydroxide ion in a solution is 1x 10 mol/litre. Find out the pH value of this solution.             (2)

7. Write four characterstics of long form of periodic table.         (4)

                                                                      OR

Write the chemical equation for the preparation of sulphur dioxide by laboratory method. Write equations of the chemical reactions of sulphur dioxide with --

i. acitic potassium dichromate

ii. hydrogen sulphide

iii. chlorine.

8. What do you understand by Alkane, Alkene and Alkyne ? Explain them with examples.

                                  How will you convert the following ?    

(Give chemical equations only)                 (7)

i. Acetic acid to methane

ii. Ethyl alcohol to acetic acid.

                                                                          OR

Write short notes on the following :

i. Alkyl Radical

ii. Polymerization

iii. Substitution reactions

iv. Ozonolysis.

Part - C (Biology)

9. a) Deficiency of which hormone creates diabetes disease ?           (1)

i. Gastrin              ii.  Insulin               iii. Thyroxin                        iv.   Parathormone

b) Law of segregation was proposed by :                     (1)

i. Charles Darwin          ii. Hugo de Vries       iii. John Gregor Mendel      iv. Robert Hooke

c) Coca-Cola is :           (1)

i. stimulant     ii. hallucinogen        iii. sedative    iv. alcohol

d) Life is originated :            (1)

i. In sea        iii. On earth       iii. in atmosphere          iv. in space

10. a) Mention the number of premolar teeth in each jaw of man and write their function.  (2)

b) What are the acquired characters ? Who proposed the theory of inheritence of acquired characters ? (2)

c) Mention two methods of vegetative propagation with examples in plants.           (2)

11. a) What are the endocrine glands ? Write the names of any two main endocrine glands and functions of hormones secreted by them.                (4)

                                                                          OR

What is population explosion ? Describe in brief the disadvantages and preventive measures of population growth.

b) Draw a digrammatic presentation of conduction of water in plants. ( No description is required )                                     (4)

                                                                     OR

Draw a neat and labelled diagram of the structure of nephron of man. ( No description is required )

12. With the help of naet and labelled diagram, describe the internal structure of human heart. Clarify the differences in arteries and veins.                             (7)

                                                                               OR

Define photosynthesis. Describe the factors affecting the photosynthesis. Explain the light reaction of photosynthesis.                                

   Done !