Advertisement
Some important questions is science
1. Explain the basis and working of atomic reactor? V.V.important
1. Basis of atomic reactor: - A controlled chain reactions is the
basis of atomic reactor.
2. Fuel: - The fuel used in an atomic reactor is Uranium-235
3. Working: - The nuclear fission of U-235 is carried out
by bombarding it with slow neutrons. The nuclear chain reaction is thus set in.
it is controlled by boron steel or cadmium rods. Thus, the liberation of energy
in the fission process is controlled.
4. The energy released is used to heat water to
convert it into steam, the steam in turn is used to turn turbines and generate
electricity.
2. What is nitrogen fixation? Explain its physical
process? V.V.important
Ans: 1. Nitrogen fixation: - The Process by which atmospheric nitrogen
is converted into its compound is called Nitrogen fixation.
2. Physical Process of Nitrogen
fixation: -
[A]
During lightning, the atmospheric nitrogen is oxidized to nitrogen dioxide NO2
[b] The Nitrogen dioxide then gets dissolved in rain
water to form nitrous and nitric acids which are taken to the soil along
With the
rain Water.
[c] In the soil, they react with other elements to
form nitrogen compounds.
[d] This process of Nitrogen fixation is called
Physical process of Nitrogen fixation
1. Give Four Physical Properties of Hydrogen Sulphide?
1. Hydrogen sulphide gas is colourless 2. It has
rotten egg like odour 3. It is heavier than air 4. It is partially soluble in
water.
2. Name the allotropes of phosphorous.
The allotropes are: -1. Yellow phosphorus 2.Red phosphorus
3. Fuel containing less proportion of sulphur should
be used.
1. Fossil fuel contains sulphur. Combustion of
fossil fuels releases oxides of sulphur, i.e. mainly sulphur dioxide
2. Sulphur dioxide is a
pollutant. It causes irritation of eyes, throat. It may also lead to bronchitis
and other respiratory
Disorders.
4. Ethylene undergoes addition reaction
1. Ethylene
is an unsaturated hydrocarbon. 2. in its molecule there is a Carbon-Carbon
double bond (C=C). Hence,
5.
Cancer cannot be diagnosed (Cured) in its early stage.
1. Cancer does
not show any symptom for a long time.
2. The
detection or diagnosis of cancer, therefore, is not possible in its early
stage.
6. Write Molecular formula for 1. Limonite (2Fe2O3) 2.
Haematite (Fe2O3) 3. Copper glance (Cu2S)
4. Cup rite (Cu2O)
7.
Write two functions of Vitamin B12
1. Vitamin B12 is essential for
maturation of cells.
2. Vitamin B12 is necessary for the
proper functioning of the nervous System
3. B12 plays an important role in the
formation of red blood corpuscles.
8.
Which are fat soluble vitamin ans: - 1.Vitamin A 2.Vitamin D 3.Vitamin E 4.Vitamin K
9.
What is the importance of the following in our diet?
1. Vitamin K: - Vitamin K helps in the formation of
prothrombin, a kind of protein necessary for the clotting of blood.
2. Minerals: - Minerals are necessary for regulatory and protective
functions in the body.
10. Four methods of concentration of ores Ch 4
Ans: - The Four methods used for removing gangue from
ores are
1.
Washing 2. Froth floatation 3. Magnetic separation 4.
Chemical Separation
11. Name Four Alloy of Steel?
Ans: - 1. Stainless Steel 2. Tungsten
Steel 3. Manganese Steel 4. Chrome Steel.
12. What is Magnalium?
Ans: - Magnalium is an alloy of aluminium. It Contains
aluminium and magnesium.
13. What is blister Copper?
Ans; - The Copper obtained from the converter, which
has blistered appearance on the surface is called Blister Copper. Due to
escaping of SO2 gas from the molten mass of the metal as it cools, the
metal surface has blistered appearance. It contains 98.5% Copper.
14. Name the important minerals Containing Phosphorus?
Ans: - The Important minerals containing phosphorus
are:-1. Phosphorite Ca3 {Po4}2 2. Fluorapatite 3Ca3 {PO4}2
3. Chlorapatite 3Ca3 {PO4}2 4. Wavellite 4ALPO4
15. Name two
secondary pollutants.
Ans: - Secondary pollutants 1. Ozone 2. Peroxyacetyl nitrate {PAN}
16. Write two tests to identify hydrogen sulphide gas.
Ans: - 1. Hydrogen sulphide gas has a smell of rotten
eggs.
2. A
stripe of moist lead acetate paper turns black when it comes in contact with H2S
17. Name two endogenous processes by which
vegetables and fruit perish
Ans: -
1.Respiration 2. Transpiration
18. Enlist the
names of any four natural food preservatives.
Ans-- 1. Sugar 2.
Salt 3. Oil and 4.
Spices.
19.
Solar energy is essential for Bio-chemical cycle.
ANS: - The energy required for the operation of
different biogeochemical cycles is obtained from solar energy.
Therefore, solar energy is essential for Bio-chemical
cycle
20. State the effect of Kidney failure on health
1. Oedema occurs due to the accumulation of
poisonous substances in the tissue of the body.
Increase in
urea of blood leading to Uraemia.
21. Name the important alloy of copper and their
Compositions (Important)
Ans: - 1. Brass: - Copper {60-90%}, Zinc {40-10%} 2. Bronze:
- Copper {81-90%}, Tin {19-10%}
3.
German silver: - Copper: - {50%}, Zinc {25%}, Nickel {25%} 4. Bell Metal: -
Copper: - {78%}, Tin {22%}
5.
Gun Metal: - Copper: - {88%}, Tin {10%}, Zinc {2%}.
22. Producer V/S Consumer
23. A. Give the uses of Sulphur in the field of agriculture.
23. B. Write the four causes of human diseases.
Ans: - 1.
Organic failure 2. Metabolic disorders 3. Hereditary defects 4. Environmental
pollutants.
23. C. State the effect of deficiency of iodine on
health.
Ans: - Deficiency of iodine causes goitre, i.e.
enlargement of the thyroid gland.
24. Give important application of each of the following. 1. Duralumin
2. Magnalium
1. Duralumin: - It is used to
prepare bodies and parts of aircrafts and buses. It is used to prepare Kitchen
ware.
2. Magnalium:
- It is used to prepare beams of scientific balances. It is used to prepare
household appliances and parts of
Aircraft.
25. Give the important properties of Gun metal.
1. Gun
metal: - It is very
strong and resistant to corrosion [destroy gradually by chemical reaction]
water and
Atmosphere
26. Give physical properties of Alum and Blue Vitriol
1. Alum:
- 1. It is white crystalline
compound 2. It is soluble in water and its aqueous solution is acidic.
2. Blue
Vitriol: - 1. It is a blue
crystalline Compound 2. It is soluble in water
27. Give the
uses of the following 1.Green Vitriol {ferrous sulphate} 2. Bleaching Powder
and 3. Alum
1. It
is used as a mordant in dyeing 2. It is used as an insecticide in
agriculture 3. It is used in preparing ink.
2. It
is used for bleaching clothes. 2. It is used paper and textile
industries. 3. It is used for disinfecting water.
3. It
is used as a mordant in tanning industry 2. It is used to arrest
bleeding 3. It is used in medicine 4. Purification of
Drinking
water.
28. Write the names of four alloys of
Aluminium and give their compositions
1.
Duralumin: - Aluminium (95%) Copper (4%) Magnesium (1%)
and Manganese (small amount)
2.
Magnalium: - Aluminium (90%)
Magnesium (10%)
3. Aluminium Bronze: - Copper (88-96.1%)
Aluminium (10.5%) and minute quantities of Iron and Tin
4. Alnico
alloy: - Aluminium,
Nickel, Cobalt.
29. What is Efflorescence? Give two examples? Pg No 63
30. What is the double salt made up of potassium and
aluminium sulphate commonly called? Write it’s molecular for
The double salt made up of potassium and
aluminium sulphate commonly called Alum.
Molecular
Formula: - K2SO4. Al2 (SO4)3.24H2O
31.
The following report is observed in the school health inspection. Name the diseases.
1. Sathis cannot see in dim light.
Ans: - Night-Blindness
2. Bleeding of Gums of Udayar.
Ans: - Scurvey
3 Selva has moon shaped face
Ans: - Kwashiorker
4 Raja has brittle and weak bones
Ans: - Rickets
Due to the deficiency of Vitamin D
5 Food habits
that cause’s facial paralysis
Ans: -Excessive
intake of Vitamin D
31 State the
necessary precautions to avoid the following disorders. Pg no 90
1. Arteriosclerosis 2. To control
diabetes 3. Obesity
32. Describe the processes of ammonification and
nitrification (March 03)
Ammonification: - The Process by which organic nitrogenous compounds
are converted into ammonia by the activity of micro organisms is called
ammonification.
Nitrification: - The process in which ammonia is first converted
into nitrite and then to nitrate is called nitrification.
33. What is the possible disorder due to excessive or
over consumption of Vitamin A in Diet?
1.
Dry itchy Skin 2. Painful swelling of legs and hands 3.
Thickening of long bones 4. Hyperirritability 5. Enlargement of
spleen
34. Disadvantages of excessive intake of nutrients?
Excessive intake of nutrients is wastage of nutrients
Excessive intake of nutrients results in several
disorders leading to disability or premature death.
35. State the necessary precautions to avoid high blood
pressure.
1. Restricting the consumption of saturated fats.
2. Prevention and Control of obesity.
3. Restriction in intake of salt after the age of 35 years.
36. Suggest the treatment for the following
Kidney disorder: - Kidney disorder can be treated by dialysis and
kidney transplantation.
Cancer: - Cancer can be treated by surgery, radiations and chemotherapy.
Diabetes: -
Cretinism: - pg no 107
37. in a medical test, it is found that Sugar is
present in the urine of Sathya and Suman.
State the name of the disease Name the hormone causing
this disease (March 01)
Ans: - 1. Diabetes 2. Insulin
38. What is diabetes? How is it caused? How is it
prevented? Pg no 90
39. Blood Sugar level increase in diabetes? 103
40. State the effect of the following. Pg no 105
1. Effects of x ray on health
2. Effects of Air pollution on human
health.
3. Effects of deficiency of iodine on
health.
4. Effects of physical and mental strain on
health.
5. Effects of consumption of saturated fats
on health.
41. Four chemical equation on pg no 126. V.V.
Important one will come definitely in the board Exam.
42. Solar energy is essential for
bio-chemical cycle
ANS: - The energy required for the
operation of different biogeochemical cycles
is obtained from solar energy.
Therefore, solar energy is essential
for bio-chemical cycle
43. Food materials should be covered.
Ans: - Food gets contaminated by micro
organisms, if it is not covered.
Therefore, in order to protect food from contamination it should be
covered.
MCHP- Mother Child health programme NREP-National
Rural employment Programme
44. (A) Name the hormone secreted by
the thyroid gland?
Ans: - The thyroid gland secretes the hormone thyroxine
(b)
Write down four effects due to excess secretion. Or what are the four effects
of over secretion of thyroxine.
Ans: - 1. Increased metabolic rate 2. Loss of weight 3.
Protruding eyeballs 4. Hyperactivity
45. What are narcotic drugs? Write the names of two narcotic drugs.
Ans: - 1. Narcotic drugs: - The drugs that produce stupor or
sleep are called narcotic drugs.
2. Names
of two narcotic drugs: - 1. Morphine 2. L.S.D (Lysergic acid
diethylamide)
46. Describe Fermentation? Explain the Fermentation of glucose
solution with the help of the balanced
equation? State any two
types of Fermentation? And also state the two uses of Fermentation? Give
its
By-products?
Ans: -1. The process in which complex
organic compounds are converted into simple organic ones with
The help of micro
organisms is called fermentation. 2. Fermentation is actually anaerobic
respiration
By which micro
organisms obtain energy required for their life processes. 3. Baker’s
yeast which
Produces the enzyme
Zymase is the common fermenting microbe. 4. During
Fermentation sugar such as
Glucose is converted
into alcohol and carbon dioxide and energy is released. 5. The overall
changes
Involved during
Fermentation can be represented by the following equation:
C6H12O6
--------- 2C2H5OH + 2CO2 Energy
Glucose Ethyl alcohol Carbon
Dioxide
6. Carbon dioxide produced during the
process is returned to the atmosphere.
Two types of Fermentation: - 1. Alcoholic fermentation
2. Lactic acid fermentation
Two uses of Fermentation: - 1. The process of fermentation is of great use in the manufacture of
alcohol.
2. The curing of tea and tobacco leaves
are the other uses of fermentation
By-products are: - 1. Ethyl alcohol 2. Carbon
dioxide
47. State any four diseases in children which are controlled by
immunization launched by World Health
Organisation (WHO)
Ans: - 1. Whooping cough 2. Tetanus
3. Polio 4. Tuberculosis 5. Measles.
48. Plaster of paris is used in the laboratories for sealing and
making the apparatus airtight.
Ans: - 1. When plaster of paris is mixed with proper quantity of water, it
hardens. 2. When it hardens it
Expands
slightly. 3. Hence, plaster of paris is used for sealing the gaps in the
laboratory apparatus,
Where airtight arrangement required.