Opt. Science

Normality Note

Subject: Opt-II Science                     Time: 2:15 hrs                                    F.M.: 75

 

Candidates are required to write their answers according to the instructions given.

Attempt all questions.

Group 'A'

1. Give short answer to the following questions.                        16´1=16

a)   What is gravitational field intensity?

b)   Define viscosity.

c)   What is biogas plant?

d)   State principle of calorimetry.

e)   Define magnification.

f)    What are quantum numbers?

g)   Define electronegativity.

h)   Write name two compounds having coordinate covalent bond.

i)    State Markonikov’s rule.

j)    Where do we use sluice method?

k)   Egg is considered as reference protein, why?.

l)    Write the major event in the Diakinesis phase of Meiosis cell division.

m) Define coprophagy.

n)   State law of independent assortment.

o)   Write any two examples of antibiotics.

p)  Write the advantage of using reflector telescope though it is bulky in structure.

Group 'B' [13´2=26]

2.       Is current scalar of vector quantity? Write with reason.

3.       Suggest two suitable alternative source of energy in rural area of Nepal with reasons.

4.       How can you identify whether the given lens is convex or concave?

5.       Explain in brief the terminals of a transistor.

6.       Write any four characteristics of modern periodic table.

7.       Explain in short the structure of Sulphur trioxide with diagram.

8.       Calculate pOH of aqueous solution of sodium hydroxide whose hydroxyl ions concentration is 10^-1 m/l.

9.       What is aquaregia? Write its reaction with gold.

10.   What is enzyme? Write its two characteristics.

11.   Draw floral diagram of rice with its floral formula.

12.   Show in chart how haemophilia is transferred to a son from his carrier mother.

13.   Write any two control measures for controlling high blood pressure.

14.   Write two difference between radio carbon dating and uranium lead dating technique.

 

Group'C' [6´3=18]

15. Define elastic limit. Explain Hook’s law in brief.

16. A brass rod of 200 gm mass at 100^oC is dropped into 1.2 kg of water at 30^oC. The final temperature is 35^oC. Calculate the specific heat capacity of brass.

17. Define normal solution. Calculate the molarity of 40 gram H₂SO₄in 100 ml solution.

18. Define following organic reaction with one example of each:

      a. Substitution reaction                     b. Elimination reaction

19. What type of division is Meiosis I? Write one major events in each sub phases of Meiosis I.

20. What is endocrinology? Write the effect of hypo and hyper secretion of following hormone:

      a. thyroxine                                     b. insulin

21. Explain how planetarium forms the image of stars?

                                                                         Group 'D' [4´4=16]

22. Wind up an insulated copper wire in the match box as shown in the figure. Connect two ends of the wire with a galvanometer and move a powerful bar magnet in and out of a match box very quickly. According to this activity answer the following questions.

a.             On which principle does the above activity work?

b.            What happens in the needle of galvanometer when the magnet is inserted inside the match box?

c.             What happens in the needle of galvanometer when the magnet is taken out from the match box?

d.             At which conditions the needle of galvanometer comes in rest and deflects fast?

23. What do you mean by pH ? Explain in brief how following processes are carried out:

i) Neutralization of the soil

ii) Treatment of hyperacidity

iii) Treatment of insect stings.

23. Draw a diagram to show nitrogen cycle and explain it in brief.

hög

SET II

Subject: Opt-II Science                     Time: 2:15 hrs                                    F.M.: 75

 

Candidates are required to write their answers according to the instructions given.

Attempt all questions.

Group 'A'

1. Give short answer to the following questions.                        16´1=16

a)   Define gravitational field intensity.

b)   Define elastic limit.

c)   What do you mean by briquette?

d)   State principle of calorimetry.

e)   What is diode?

f)    What are quantum numbers?

g)   Define normality.

h)   State Aufbau principle.

i)    Write the basic difference between coordinate bond and covalent bond.

j)    Write one example of addition reaction of organic compounds.

k)   In which type of ores is forth floatation process used for its concentration?

l) Define oligosaccharides.

m) Write the major event in the Diakinesis phase of Meiosis cell division.

n)   Define coprophagy.

n)   Define nitrification.

o)   Write any two examples of antibiotics.

p)  Which region of Nepal is rich in brine water?

Group 'B' [13´2=26]

2.       Is current scalar of vector quantity? Write with reason.

3.       Obstruction of local is frequent in hydropower construction region. Write any two reasons for it.

4.       How much heat is to be supplied in 40 gram of water at 30⁰C to increase its temperature to 40⁰C?

5.       Magnification of a lens is -0.7. What does this mean?

6.       Calculate the pH of aqueous solution of nitric acid whose hydrogen ion concentration is 10^-3 m/l.

7.       Explain Saytjeff’s rule with an example.

8.       What is aquaregia? Write its reaction with gold

9.       Write any two industrial function of enzymes.

10.   Draw a chart to show F₁generation when a hemophilia carrier woman marries a normal man.

11.   Draw floral diagram of rice with its floral formula.

12.   How wetland benefits ecosystem? Write any two points.

13.   Write two major causes of hyperuricemia.

14.   Write two difference between radio carbon dating and uranium lead dating technique.

 

Group'C' [6´3=18]

15. Define surface tension. Mention two effect of surface tension what we see in our daily life.

16. Draw ray diagram of compound microscope and explain in brief about its working.

17. State and explain Avogadro’s Law.

18. Explain the concept of ionic product of water.

19. Identify the followings and also write their one features:

      a)                                                                                                         b)

20. Given table shows cross between round and yellow seeded pea plant with wrinkled green seeded pea plant. Answer the following questions:

    

   i) Which generation is represented by the table?

      ii) Which law explains this? As write the law.

      iii) What percentage of the offspring are round and yellow seeded pea plant in this generation?

 

21. Explain how planetarium forms the image of stars?

 

Group 'D' [4´4=16]

22.Study the given figure and answer the following questions:

i)   Which type of generator is this?On the basis of which principle does it work upon?

ii) Draw a graph to show the nature of current produced.

iii)

a.             On which principle does the above activity work?

b.            What happens in the needle of galvanometer when the magnet is inserted inside the match box?

c.             What happens in the needle of galvanometer when the magnet is taken out from the match box?

d.             At which conditions the needle of galvanometer comes in rest and deflects fast?

23. What do you mean by pH ? Explain in brief how following processes are carried out:

i) Neutralization of the soil

ii) Treatment of hyperacidity

iii) Treatment of insect stings.

24. Draw a diagram to show nitrogen cycle and explain it in brief.

hög

SET III

SET IV

Second Term Examination-2076

Class: - Ten                                                                             F.M. - 45

Subject: - Opt. Science                                           Time: - 1:30 Hrs             

 

Group A (9×1=9)

1. Write very short answer to the following questions:

a.    Define gravitational field intensity.

b.    What is surface tension?

c.    What do you mean by bio-mass energy?

d.    State principle of calorimetry.

e.    What do you mean by magnification?

f.    Define normal solution.

g.    State modern periodic law.

h.    What is Pi bond?

i.    Write one function of simple columnar epithelium.

 

Group B (8×2=16)

2. Calculate the value of escape velocity on earth.

3. Justify the statement " Iron is more elastic than rubber".

4. Even though briquette is made from wood, why is it preferred than wood?

5. Use of electric current would be limited if transformer was not invented, why?

6. What is azimuthal quantum number? Write the value of 'l' for n=2.

7. Justify the position of potassium in modern periodic table with suitable reasons.

8. Calculate the pH of 10^-2 molar solution of H₂SO₄.

9. Write any four characteristics of monocot stem.

Group C (4X3=12)

10.        How can the concept of latent heat of fusion be determined experimentally.

11.        Study the given diagram and answer the following questions.

  i. Can this device work when it

   is connected to a d.c. source? Why?

  ii. What happens when the number of primary  turns and            secondary turns made equal?

   iii. Calculate the number of turns in a secondary coil.

12.        Discuss in brief any three application of neutralization reaction.

13.  Identity the given stages of cell division and write one character of

     each.

            

               fig. i                                                      fig ii

Group D (2×4=8)

14.        Explain the construction and working of a compound microscope.

15.        State and derive Avogadro's law. Calculate the volume of 5 mol of nitrogen gas at STP.

 

***

SET V

First Term Examination

Class: - Ten                                                                             F.M. – 45           Subject: - Opt. Science                                                         Time: - 1:30 Hrs                      

Group A (9×1=9)

1.         Answer the following questions:

a)   Define centre of gravity.

b)   What is surface tension?

c)   Define fluid pressure.

d)   What is a biogas plant?

e)   Define latent heat of fusion.

f)    State principle of calorimetry.

g)   Write one use of binocular.

h)  Define magnification of an optical instrument.

i)    What is semiconductor?

Group B (Very Short) (8×2=16)

2.             Write the differences between centrifugal force and centripetal force.

3.             Write any two factors that affect viscosity of a liquid.

4.             Although solar panels are costly, it is the better option in some part of the country. Justify.

5.             Draw a graph to show the change in temperature of water when heated from 90⁰C to 110⁰C on applying heat.

6.             Write an expression for heat equation and the meaning of the symbols used.

7.             Why is a convex lens called conversing lens?

8.             Write any two characteristics of series combination of resistors.

9.             Why is transistor known as building block of all modern electronic system?

Group C (Short Questions) (4 X 3=12)

10.        Derive an expression for the escape velocity.

11.        Write a paragraph on “Benefits of Briquettes”.

12.        Calculate the amount of heat required to raise the temperature of 500 gram of ice at 40⁰C into water vapour at 100⁰C. (Latent heat of vaporization =  22.5 ×10⁵ J/Kg).

13.        The figure given alongside is a diagram of PN junction diode. Answer the following questions:

a) You have a circuit of a cell and a bulb. Add this device in the circuit in such a way that the bulb will continue glowing.

b) N-type semiconductor is added at left side in the above device. What is the name of device thus formed? Draw its circuit symbol.

     Group D (Long Question Answer)(2×4=8)

14.         Study the figure and answer the questions:

 a. Write the observation of the experiment.

b. Which law is explained by the experiment? State the law.

c. What happens when a massive body is suspended in the spring? Writhe with reason.

15.         You need to observe a minute pollen grain in details. What instrument will you use? Draw a ray diagram to show its working. Also compare between the two lenses used in the instrument.

***

SET VI

Third Term Examination

Class: - Ten                                                                             F.M. - 75

Subject: - Opt. Science              Time: - 2:15 Hrs                 

 

Group A

1. Answer the following questions in very short.16×1=16

a.       State Hooke’s law.

b.      Write down any two gases which are primarily present in biogas.

c.       State principle of calorimetry.

d.      Define power of lens.

e.       What is electromagnetic induction?

f.       Write down the value of Avogadro's number.

g.      Define Ionization potential.

h.      What is the value of ionic product of water (Kw) at 25 degree Celsius?

i.        What are nucleophiles?

j.        Write two chief ores of aluminum.

k.      Which two monosaccharide do lactose contain?

l.        Which enzyme converts protein into peptones?

m.    Write any two examples of sex linked diseases.

n.      What is biogeochemical cycle?

o.      Name the organ that cannot be transplanted till now.

p.      Write any two examples of fossils preserved in Natural History Museum (NHM) of Nepal.

Group B

Answer the Following questions in short    13×2=26

2.       Write any two differences between centrifugal force and centripetal force.

3.      A sewing needle placed carefully on the water floats even though its density is higher than thedensity of water. Why?

4.      Latent heat of vaporization of water is 22.5 x 10⁵joules per kg. What does it mean?

5.      Distinguish between the nature of image formed by the eye lens and objective lens of telescope.

6.      Write any two differences between sigma and pi bonds.

7.      How can we reduce hyperacidity? Describe in brief.

8.      Which rules govern the given reactions? State the rules too.

(i)        CH₃-CH₂-CH₂ –CH₂-CHBr–CH₃ → CH₃-CH₂-CH=CH-CH₃

(ii)      CH₃-CH=CH₂ + HBr → CH₃-CHBr-CH₃

9.      Write down the balanced chemical reaction of gold with aquaregia.

10.  Why should athletes, labourers, etc. need high carbohydrate in their diet?

11.  Compare monocot and dicot stem with any two points.

12.  "All hormones are chemical signals." Give reason.

13.  Write short note on biological nitrogen fixation.

14.  The average half-life of radioactive carbon (₆C¹⁴) is 5735 years. What does it mean?

Group C

Answer the Following questions.                                      7×3 = 21

15.  The mass of the Earth is 6.0 × 10²⁴ kg and its radius is 6.4 x 10⁶m. Find the gravitational fieldintensity at a point on its surface. What is the weight of a body of mass 100 kg on its surface? (G= 6.67x 10-¹¹ Nm²/kg²)

16.  How is biogas produced? Explain with diagram.

17.  Calculate the molecular mass of Ammonium carbonate and Calcium Carbonate.

18.  Explain the formation of sodium chloride molecule with the help of diagram.

19.  Draw the internal structure of monocot stem and label the parts hypodermis and metaxylem.

20.  Explain the process of determining blood group with diagram.

21.  How planetarium is formed the images of the stars?

                                   Group D

Answer the Following long questions.    3×4=12

22.  Wind up an insulated copper wire in the matchbox as shown in the figure. Connect two ends of the wire with a galvanometer and move a powerful bar magnet in and out of a match box very quickly. According to this activity answer the following questions.

 

a.          On which principle does the above activity work?

b.      What happens in the needle of galvanometer when the magnet is inserted inside the match box?

c.       What happens in the needle of galvanometer when the magnet is taken out from the matchbox?

d.       At which conditions the needle of galvanometer comes in rest and deflects fast?

23.  Hydrogen can be placed in group IA along with the alkali metals and in group VIIA along with the halogens. Justify its position with two points each.

24.  A homozygous plant having round seed and inflated pods is first cross pollinate with a homozygous plant having wrinkled seed and constricted pods and then self-pollinate. What result will be obtained in second generation? Show your result up to F₂ generation indicating the phenotype and genotype ration in chart.

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