Nine Opt Sci 3

 

Class: IX                                                                   FM-75

Subject: Opt. Science

Group A (15×1=15)

1.   Define uniform acceleration with an example.

2.   What are radio-active elements give two examples.

3.   What is the principle of liquid thermometer?

4.   What is Fiber optics?

5.   What is a neutral Point?

6.   Methane is called marshy gas, why?

7.   In which condition real gas show ideal behaviour?

8.   Define hydrolysis reaction.

9.   What are isotopes and isobars?

10.                How many ATP molecules are formed in aerobic respiration?

11.                What is the study of fungi called?

12.                Define mutation.

13.                What are cursorial animals? Write down any two examples.

14.                What is the main difference between anaerobic and aerobic bacteria?

15.                What is geology? Write the estimated age of the earth.

Group B (13×2=26)

16.                Derive the expression for time period of a simple pendulum.

17.                Give two differences between Nuclear fusion and Nuclear Fission.

18.                A comb rubbed with dry hairs attracts small pieces of paper. Give reason.

19.                Show U=vdg

20.                What are the limitations of Bohr's Atomic Model?

21.                Write the IUPAC names of the following compounds

i. CH₃ -  CH₂ -    CHO

ii. CH₃     CH       CH₂

22.                Volume of Hydrogen is double the volume of oxygen during the electrolysis of water. Give reason.

23.                Define Calcination and Roasting.

24.                How is biology related to chemistry? Write down any two reasons.

25.                Nucleus is called the brain of cell, why?

26.                State the point of cell theory.

27.                Define heredity. Point out the importance of gene.

28.                All ores are minerals but all minerals are not ores. Give reason.

Group C (6X3=18)

29.                The Weight of a stone in air, water, and salt solution is given in the table below. Answer the question on the basis of the table.

Medium	Weight
X	24N
Y	30N
Z	20N

 

i) Identify the medium X, Y ,Z

ii) Find the upthrust in the water and salt solution.

iii) Find the mass of water displaced.

30.                The coefficient of the linear expansion of brass is19×10^-6  per °C. The volume of a solid Sphere of brass at 27 °C is 4×10^-3   m^3. Find the increase in the volume of the sphere when it is heated up to 127 °C.

31.                The density of ammonia gas is 0.717 kg/m³. In 30 seconds 15 cc of ammonia diffused. Under similar time and condition, how much volume of carbon dioxide gas gets diffused if its density is 1.832 kg/m³?

32.                Write the main postulates of kinetic theory of gases.

33.                Define osmosis. Mention the differences between endosmosis and exosmosis.

34.                Describe Darwin's theory of evolution.

 

Group D (4×4=16)

35.                A beam of white light passing through a glass prism is shown in the given figure.

i)  Which Phenomenon of light is shown in the given figure?

ii) What is the cause of this phenomenon?

iii)  Name each of the seven colors in order.

iv)  Which color deviates minimum and maximum? Why?

 

 

36.      A figure of electroplating is given below. Answer the given question from the figure.

 

i.              Which electroplating is shown in the figure?

ii.            Give the name of A and B.

iii.         After electroplating, what would be the thickness of A and B?

iv.          What should be the concentration of CuSO₄ after the process?

 

37.                Describe the life cycle of Paramecium by transverse binary fission with the help of diagram.

38.                Define solar wind.Draw the Flow chart of the birth and death of the stars.