1. 30. Write the applications of Boyle’s Law in daily life.
Ans:-[a]Deep sea fishes die when suddenly they are brought to surface due to low
pressure.
[b] A scuba drivers life is under threat when he suddenly comes to the surface
quickly.
[c] Filling up cheeks with Air
[d] popping of balloon when squeezed
OR State the relationship between rate of diffusion and mass of gas.
Ans: Relationship between diffusion of mass consider the equation r = 1 𝒅
We can rewrite as r = 1 𝒅 = r = 𝐊 𝒎 𝒗 [ because d= (𝒎) (𝒗) ]
We can rewrite as r = 1 𝒅 = r = K 𝒎 𝒗
31. What is the role of enzyme invertase and zymase in the manufacture
Of ethanol from molasses?
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2. Ans:-[a] C12H22O11 + H2O C6H12O6 + C6H12O6
Sucrose
Glucose
Fructose
Invertase converts sucrose into glucose and fructose
Ans:-[b] C6H12O C2H5OH+ 2CO2
Glucose
Ethanol
Carbon di oxide
Zymase converts glucose into ethanol OR
[31] What is the role of slaked lime and animal charcoal in the manufacture
Of sugar from ?
Ans: - Slaked lime and Animal charcoal help to decolourization of sugar
[32]Write any four measures to control air pollution.
Ans: -[1] Industries to be established away from towns and cities.
[2]use of unleaded and biofuels must be encouraged.
[3] Automobiles to be periodically checked to improve the efficiency of engines.
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[4] Educating the public to use public transport.

3. Calculate its wave velocity.
[33] The frequency of a sound wave is 256 Hz and its wavelength is 1.2m
Calculate its wave velocity.
Ans: n = 256 Hz V= n
V = n
I = 1.2m
V = 256 x 1.2
V = m/s
The velocity of sound wave is m/s
[34] Draw the diagram showing
the structure of HIV
Answer the following questions
35. How does an ultra sound scanner work? Explain. Write one use of it.
Ans: The operator places a probe over the part of the body to be examined.
Lubricating jelly is put on the skin so that the probe makes good contact .
With your body. The probe is connected by the wire to the ultrasound machine.
and monitor pulses of ultrasound are sent from the probe to the body .
The ultrasound bounces back from the various structures in the body .
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4. OR 35. How does a sonar work ? Explain mention its uses.
Ans: The transmitter produces and transmits ultrasonic waves . These waves
Travel through water until they strike an object. They get reflected and the
Reflected waves return to the sonar and are sensed by the detector. The detector
Converts the ultrasonic waves into electrical signals which are interpreted.
The time interval transmission and reception is recorded. The distance of the .
Object is calculated by d = v x d 2
36. Explain the structure and function of neuron.
Ans: Neurons are the structure and function unit & nerve tissue.
The nerve tissue responds to the external and internal stimuli of the body. The part consisting of a prominent nucleon is the cell body.
The short projections arising from the cell body are called dendrites. The long extension . If the cell is called Axon body on the axon.
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The axon covered by myelin sheath.

5. [2] It protects the inner tissue of plant
36. Epidermis plays an important role in the survival of a plant.Explain
Ans:Epidermal tissue : The plant body is externally converted by a tissue
Known as epidermis.
FUNCTION:
[1] Epidermal tissue covered by cuticle , hence of prevents the excessive loss
Of water
[2] It protects the inner tissue of plant
[3] It is modified in different parts to perform various functions.
37. Let the atomic numbers of the elements v,w,x,y and z respectively be equal
to 7, 10, 12, 4 and 19 with reference to the modern periodic table.
Answer the following questions :
1. Which of the element in the above is noble gas?
2. Which of the element belongs to S - Block
3. Which of the element has more atomic size ?
1. W – elements in the above is noble gas
2. V – elements belongs to S - blcok
3. Z – Elements
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6. 38. Draw a diagram of the blast furnace
used in the extraction of iron and
Label the parts
Ans:
39. Draw a diagram of
nuclear power reactor
and label the parts.
Ans:
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7. ANSWER THE FOLLOWING QUESTIONS
3 x 4 = 12
ANSWER THE FOLLOWING QUESTIONS
40. Draw a diagram of Showing vertical section of human eye ball and label
the pars
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8. 41. [a] Black holes are invisible . Why? How are they identified
Ans: [a] because , black holes have high gravitational force so , No information
In the form of light radio waves . Comes out of it.
They are identified by studying the properties like density and gravity.
41. [b] How do multistage rockets differ from single state rocket .Explain
Ans: In multistage rocket several rockets are joined together one on top of the
Other provide the necessary power. By using such rocket the fuel consumption
Can be reduced. OR
41[a] Write the mathematical equation to calculate orbital velocity of a
Satellite. Write the meaning of the symbols used
V0 = 𝑹𝒈
R = Radius of the earth
g = Acceleration due to gravity
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9. 41. [b] Explain how a protostar is formed,
Ans: The huge hydrogen gaseous clouds continuously contract due to their
Own gravity which increase in density and pressure at the center . The
Central portion which constitute about 90% of the mass of the cloud and
Sphere is formed at the center is called protostar
42. An experiment is conducted in the laboratory by heating the mixture of
sodium acetate and soda lime . With respect to the above experiment answer
The following
[a] Name the gas involved and write its molecular formula.
Ans:- [a] Methane gas M.F = CH4
[b] Write the balanced chemical equation for the above equation.
Ans:- [b] CH2COONa + NoaH HNa2CO3 + CH4
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10. [c]How the gas evolved is collected?
Ans:- Methane gas is collected by the download displacement of water.
[d] The gas liberated does not react with nitric acid . Give reasons.
Ans:- Because methane gas is chemically inert.
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14. ALL THE BEST FOR EXAM s.s.l.c. exam 2017
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