Category: 8th Science

Quiz on Mahatma Gandhi by jsunil tutorial

1/11/2018

Download quiz on Gandhi jee Cps samastipur

Q.1. Mohandas Karamchand Gandhi was born on
(a) October 5, 1896
(b) October 3, 1840
(c) October 2, 1869
(d) October 10, 1880
Q.2. At which place was Gandhiji born?
a) Porbandar
(b) Rajkot
(c) Ahmedabad
(d) Delhi
Q.3. What was Gandhiji's age when he got married to Kasturbai?
(a) 19 years
(b) 15 years
(c)12 years
(d) 13 years
Q.4. Gandhiji confessed his guilt of stealing for the purpose of smoking in a letter, promising never to steal in future and asking for adequate punishment. To whom was this letter addressed?
(a) Father
(b) Mother
(c) Elder Brother
(d) Friend
Q.5. About how old was Gandhiji when he reached London to become a barrister?
(a) 20 years
(b) 19 years
(c) 21 years
(d) 18 years
Q.6. To become a barrister in England, one had to join one of the Inns of Courst. After obtaining admission, Gandhiji joined the Inner Temple on
(a) October 5, 1870
(b) December 15, 1885
(c) November 6, 1888
(d) January 3, 1880
Q.7. Devdas was Gandhiji's
(a) Only child
(b) Second child
(c) Eldest child
(d) Youngest child
Q.8. Gandhiji, the votary of nonviolence was shot dead on January 30, 1948 at Birla House, New Delhi, shortly after 5 p.m. while going to the prayer meeting. Which was that fateful day of the week?
(a) Saturday
(b) Wednesday
(c) Friday
(d) Monday
Q.9. In which South African unit had most of the India emigrants taken up abode?
(a) Johannesburg
(b) Natal
(c) Maritzburg
(d) Durban
Q.10. While holding a first-class ticket Gandhiji was ordered by a railway official to shift to the van compartment. On his refusal to comply with the unjust order, a constable was called to push him out with bag and baggage. Identify the railway station where this incident took place.
(a) Natal
(b) Johannesburg
(c) Maritzburg
(d) Durban
Source:https://www.mkgandhi.org
Answer:
1. (c) 1869
2. (a) Porbandar
3. (d) 13 years
4. (a) Father
5. (b) 19 years
6. (c) November 6, 1888
7. (d) Youngest Child
8. (c) Friday
9. (b) Natal
10. (c) Maritzburg

Quiz on Mahatma Gandhi by jsunil tutorial
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CBSE Class8 Science Metals and Non metals solutions

23/8/2018

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1. What is ore? [1]

Ans: An ore is a naturally occurring mineral from which one or more metals can be profitably extracted.

2. What is metallurgy? [1]

Ans: Metallurgy is the science of extracting metals from their ores and purifying them.

3. Differentiate between metal and non–metals on the basis of any one physical
property. [1]

Ans: Metals are ductile. It is the property that allows the metals to be drawn into wires.
Non metals are not ductile.

4. Give the reaction of magnesium with water. [1]

Ans: Mg + 2H2O -----------> Mg(OH)2 + H2

5. What is alloy? [1]

Ans: An alloy is a homogeneous mixture of a metal with another metal(s) or non–metal(s).

6. Define: (i) Concentration of ore (ii) Reduction [2]

Ans:
(i) Concentration of ore: It is the preliminary treatment of an ore in which impurities are removed.
(ii) Reduction: The metal compound is reduced to get free metal

7. What is metallic luster? Why metals are useful for jewellery and decoration. [2]

Ans: Metals have shiny appearance. This property is known as metallic luster.The shiny appearance makes the metals useful for jewellery and decoration

8. Explain conductivity in case of metals and non metals. [2]

Ans: Metals are good conductor of heat and electricity. Gold is the best conductor followed by silver, copper and aluminum.
Non–metals are generally bad conductors of heat and electricity.

9. Discuss the reaction of metals and non–metals with oxygen. [3]

Ans: In general, metals form oxides on combining with oxygen. The water solutions of these oxide are alkaline or basic in nature and changes red litmus into blue.
2Mg + O2 ---------> 2MgO
MgO + H2O-----> Mg (OH)2
Non metals too combine with oxygen to form oxides.
However, such oxides are acidic in nature

10. Discuss the reaction of metals with water. [3]

Ans: Sodium reacts violently with water. Magnesium reacts mildly with cold water but
vigorously with hot water or steam.
Mg + 2H2O -----------> Mg(OH)2 + H2

Zinc and iron react very mildly with steam, whereas copper, silver and nickel do not
react with water.Non–metals also do not react with water.

11. What happens when iron nails are put in copper sulphate solution? [3]
Ans: When iron nails are put in copper sulphate solution, the blue colour of the solution
starts fading

gradually. At the same time, iron nails get a shiny coating of red brown copper metal on
their surface.This change takes place as iron displaces copper from copper sulphate.

12. What is electroplating? [5]

Ans: Electroplating: Iron and steel are protected from corrosion by coating them with a
layer of tin or chromium metals which are resistant to corrosion. This can be done by electroplating. A thin layer of tin deposited on the inner surface of iron containers makes them safe, for storing food.
Chromium plating protects steel furniture, taps and bicycle handles from corrosion. Coating of chromium not only giveslonger life to the coated objects but also gives a good shining appearance to them.

13. Discuss some common uses of metals and non–metals? [5]

Ans: Metals are strong, hard and rigid. So they are used in making machinery.
The automobiles, the aeroplanes, the trains, satellites, industrial gadgets all use metals in large amounts.

Iron is the most commonly used metal.

Aluminium is another metal that is most widely used gold.
Silver is widely used for making jewellery.
Common non–metals are oxygen, nitrogen, chlorine, sulphur and iodine.
Oxygen is used by plants and animal for their survival.
Nitrogen in the compound form provides nutrients to plants.
Chlorine is used in water purification.
Sulphur is used in the making of sulphuric acid. Tincture iodine is applied on wounds.

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cbse class 8 science Solved Test paper for Chapter Sound

23/8/2018

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1. How is sound produced ?

Ans: Sound is produced by a vibrating body e.g. when a tightly stretched bond is plucked, it vibrates and produced sound. When it stops vibrating , it does not produced any sound .

2.   How is sound produced by humans?

Ans: In humans, the sounds is produced by the voice box or the larynx. Put your fingers on the throat and find a hard bump that seem to move when you swallow. This part of the body is known as the voice box. This is at the upper end of the wind pipe. Two vocal cords are stretched across the voice box or larynx in such a way that it leaves a narrow slit between them for the passage of air. When the lungs force air through the suit the vocal cords vibrate, producing sound.

3.   why the voices of men, women and children are different.

Ans: The vocal cords in men are about 20 mm long. In women these are about 15 mm shorter. Children have very short vocal cords. This is the reason why the voices of men, women and children are different.

4.   What is oscillatory motion

Ans: The to and fro motion of an object is known as vibration. This motion is also called oscillatory motion.

The number of oscillations per second is called the frequency. It is expressed in hertz. Its symbol is Hz.

Amplitude and frequency are important properties of any sound.

5.   On what factor loudness of sound deepens on?

Ans: Loudness is property of sound that distinguish loud sound from bass .

The loudness of sound depends on its amplitude.

It is proportional to the square of the amplitude of the vibration producing the sound.

When the amplitude of vibration is large, the sound produced is loud.

When the amplitude is small the sound produced is feeble. The loudness is expressed in a unit called decibel(dB). Above 80 dB the noise becomes physically painful.

6.   What is pitch?

Ans: It is the characteristics of sound distinguish shrillness and pitch of the sound.

When the frequency of the vibration is higher, then the sound has a higher pitch. When the frequency of vibration is lower, then the sound has a low pitch.

The frequency of the voice of a child is higher than that of an adult. The voice of a woman has higher frequency and is shriller than that of a man.

7.   What is range of the frequency of audible sound ?

Ans: The sounds of the frequencies less than about 20 vibrations per second (20 Hz) are called inaudible sounds or infrasonic.

Such sound can not be detected by the human ear.

The sound of frequencies higher than about 20,000 vibrations per second (20 kHz) are called the ultrasonic sound.

For human ear, the range of audible frequencies is roughly from 20 to 20,000 Hz

8.   Why are sound waves called mechanical waves?

Ans: Sound waves force the medium particles to vibrate. because of the interaction of the particles present in that medium

9.   What is SONAR?

Ans: SONAR stands for Sound Navigation and Ranging and it works on the principle of reflection of sound waves. The SONAR technique is used to determine the depth of the sea and to locate under water hills, valleys, submarines, icebergs sunken ships etc.

10. What is the intensity of sound?

Ans: The amount of sound energy passing each second through unit area is called the intensity of sound.

11. Define :
(i) Reverberation of sound.
(ii)Echo
(iii) Time period
(iv)Wavelength.
(v) wave velocity
(vi) compression.
(vi) rarefaction
Ans:
(1)The persistence of sound due to repeated reflection and its gradual fading away is called reverberation of sound.

(2) Echo is a repetition of sound due to the reflection of original sound by a large and hard obstacle.

(3) Frequency is defined as the number of oscillations per second. The time taken by the wave for one complete oscillation of the density or pressure of the medium is called the time period, T.

(4) The distance between two consecutive compressions or two consecutive rarefactions is called the wavelength.

(5)The distance traveled by a wave in one second is called wave velocity. It depends upon the nature of the medium through which it passes.

(6) The part or region of a longitudinal wave in which the density of the particles of the medium is higher than the normal density is known as compression.

(7) The part or region of a longitudinal wave in which the density of the particles of the medium is lesser than the normal density is called a rarefaction.

13. What through and crest.

The point of maximum positive displacement on a transverse wave is known as crest. The point of maximum negative displacement on a transverse wave is known as through.

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Class 8th Conservation of plants and Animals

23/8/2018

4 Comments

Book resource: Science power Class 8th
Check point [Formative Assessment]

1. Define Afforestation?

Answer: The practice of planting more and more trees is called Afforestation.

2. What is desertification? What causes desertification?

Answer: The phenomenon of converting fertile land into desert is called desertification. Deforestation causes desertification.

3. What is the effect of deforestation on rainfall and climate?

Answer: Deforestation increases temperature and wind velocity that reduce rainfall. These changes led to climate change.

4. What is wild life?

Answer: Wild life is an area where organism lives in their natural habitat like dense forest, jungle and water bodies.

5. Give one difference between endangered and vulnerable?

Answer: Endangered are those animals that are not likely survive and will soon extinct where as
Vulnerable are those animal which are likely to move in endangered category in future.

6. What is Red Data Book?

Answer: Red Data Book is the source book which keeps a record of all the endangered animals and plants.

7. Name the first national park of India? When it was it established?

Answer: A national park is protected land area that provide natural habitat to wild life. Jim Corbett National Park is the first national park of India established in 1936.

8. Name three different region of biosphere reserve?

Answer: Core Zone, Buffer Zone, and Manipulation Zone.

9. Name the   international body responsible for wild life conservation?

Answer: World Conservation union

10. What is the objective of project tiger?

Answer: To save tigers from unauthorized killing.

11. What are endemic species?

Answer: Endemic species are those species of plants and animals which are found exclusively in a particular area and do not found anywhere else naturally.

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8th Micro organism Solution Cordova Learning science 2018-18

14/4/2018

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C. Fill in the blanks:
1. Microorganisms may be unicellular or Multicellular.

2. Lactobacillus bacteria help to make curd from milk.

3. Disease causing microorganisms are called pathogen.

4. Ammonium salt in the soil is converted first into nitrites by -- Nitrifying ----- bacteria.

5. Casein coagulation takes place only when milk is hot .

6. Salting draws out water from food.

7. Nitrate in the soil are converted by ammonifying bacteria into nitrogen gas.

8. The process of preventing food spoilage by chemical or physical methods is called food
preservation.

D. Very Short Answer Questions:

1. Name any two antibiotics.

Ans. Penicillins, streptomycin, tetracycline

2. Give the names of any two communicable diseases.

Ans. Malaria , Typhoid

3. What are the two common food preservatives used at our homes:

Ans.Salt,sugar,oil

4. Name two microbial diseases which spread through air,

Ans. Common cold,flu,tuberculosis, influenza, small pox

5. Name any one unicellular algae.

Ans. Cyanobacteria

6. Name any disease caused by virus in humans

Ans. HIV

E. Short Answer Type I Questions:

1. What is pasteurization?

Ans. The process of heating milk at 70 degree for about 15 min and then cooling it for
quickly is called pasteurization. This kill the most of the bacteria without affecting flavor.

2. How do leguminous plants increase the soil fertility:

Ans. leguminous plants provide shelter to Rhizobium bacteria that help in converting
atmospheric nitrogen present in soil into useable form that is taken by plants to make
plant protein.

3. What is meant by nitrifying bacteria?

Ans. Bacteria which help to convert ammonia present in soil into nitrates is called
nitrifying bacteria.

4. How does female Anopheles mosquito spread malaria?

Ans. Female Anopheles mosquito carries the malaria germ. When it bites a healthy
person, he/she can get infected with malaria.

5. How do antibiotics work?

Ans. Antibiotics kill or stop the growth of disease causing microbes

F. Short Answer Type-II Questions:

1. (a) How do viruses differ from other microorganisms? (b) What is meant by
fermentation?

Ans. (a) A virus is a microorganism which exhibits characteristics of living as well as
non-living things.

(b) The conversion of sugar into alcohol in absence of oxygen using yeast is called
Fermentation.

2. Explain the formation of curd from milk.

Ans. Milk contains a sugar called lactose, when milk is heated to a temperature of 30-40
°C and a small amount of sour curd added to it, the lactobacillus starts to grow and
convert the lactose into lactic acid and thus milk coverted into curd.

3. What is vaccine? How does it work?

Ans. Vaccines are substance used to produce immunity to diseases in the living body.

Vaccine consist of dead or weaken microbes .When these swallowed or injected into body
of patient, the body produce antibodies to fight them. Antibodies remain in bodies and
protect it from any future attack disease causing microorganism

Value Corner

4. Microorganisms decompose dead organic waste of plants and animals and help in
keeping the environment clean.

(a) What would happen, if microorganisms do not perform this function?

(b) Being a student, how can you contribute in keeping the environment clean! Give two
ways.

Ans.(a) air , water and soil get polluted if microorganisms do not decompose dead
organic waste of plants and animals

(b) (ii)Always follow 3R – Reduce ,reuse and recycle (b) Avoid wastage of natural
resources and use them wisely and carefully.

G. Long Answer Questions:

1. Explain two methods of food preservation. Also, discuss the advantages of food
preservation.

Ans. Food can be preserved in the following ways:

(i) Heating: Heating food to a high temperature kills microorganism e.g water and milk.

(ii) Salting: Salt prevents food spoilage by checking the growth of bacteria. Salt forces
microorganisms to lose wafer by a process called osmosis.

The advantages of food preservation are

(i) Food last for longer period (ii) Food preservation prevents the food from being
spoiled by the action of enzymes and microorganisms. (iii) It increases the availability of
out of season foodstuffs.

2. Draw a neat diagram to show nitrogen cycle and explain the process of nitrification
and denitrification.

Ans. Nitrification is the process of conversion of ammonia into nitrates .It is carried out
by nitrifying bacteria.

Denitrification is the process of conversion of nitrates into free nitrogen gas. It is carried
out by denitrifying bacteria.

3. Describe the principle on which the following methods of food preservation are based:

(a) boiling (b) canning (c) freezing (d) dehydration

Ans. (a) boiling: Heating to food at high temperature kill bacteria.

(b) Canning: canning stop the supply of oxygen to bacteria and stop its growth.

(c) freezing: it lower the temperature that reduce the growth of bacteria

(d) Dehydration: it force bacteria to loose water by osmosis and stop growing further.

H. HOTS (Higher Order Thinking skills) Questions:

1. Why do we say that if a person suffers from chickenpox once, he/she is not likely to be attacked by the same disease in future?

Ans. when one suffers from chickenpox the body makes the antibodies that remain in
body and prevent any future attack.

2. Why should we always wash our hands before handling food items?

Ans: We should always wash our hands before eating to prevent the germs in our hands
from entering the food so that we are prevented from getting diseases.

Fore more book solution visit: 8th science Ch_02

Note: If you found any mistake Pls inform me at jsuniltutorial@gmai.com for correction

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8th Chapter Crop production and Management (Cordova Science solution) 2018

10/4/2018

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E. Short Answer Type-I Questions:

1. What is meant by agricultural implements?

Ans: Agricultural implements are any kind of machinery or tools used on a farm to help
with farming. The best-known example of this kind is the tractor.

2. How do legurninous plants help in maintaining the soil fertility?

Ans: Rhizobium bacteria present in the root of legurninous plants convert the
atmospheric nitrogen into ammonia into soil, which is used by plants.

3. What is pisciculture?

Ans: Rearing of fish is called pisciculture.

4. Why is it important to sow seeds at a correct distance from each other?

Ans: Seeds should be shown at a correct distance from each other so that seed get
sufficient sunlight, nutrients and water from the soil.

5. Give two precautions that must be taken while sowing seeds.

Ans: seeds should be shown with right spacing and at right depth

6. How does winnowing help in separation of grains from husk?

Ans: When mixture of grain and chaff dropped on the ground from a height, The heavier
seeds fall on the ground where as the lighter chaff gets blown away by the wind and fall
at a distance.

7. Why is the spraying of pesticides harmful to us?

Ans: The spraying of pesticides cause irritation to skin and respiratory problems. They
get mixed with soil and water and absorbed by plants. These then enter our bodies
through fruits and vegetables which we eat and cause us harm..

F. Short Answer Type-II Questions:

1. (a) Why is irrigation necessary? (b) Why is the drip system of irrigation a water-
economical method?

Ans: Rain varies and doesnot always supply the right amount of water at right time.
Therefore it is important to supply water regularly to the crops.

2. Define fertilisers. Name any four fertilisers.

Ans: Chemical substance that contain one or more nutrients essential for plants eg
Urea., Calcium Nitrate, Ammonium Sulfate, Super Phosphate

3. The farmers of a village are celebrating the harvest festival of Baisakhi along with their
families. They are dancing and singing traditional songs.

(a) What is harvesting? Why do farmers celebrate Baisakhi? (b) What do we learn from
celebrating festivals?

Ans: (a) Cutting and gathering of mature crops is called harvesting.

(b) Farmers celebrate Baisakhi to express gratitude to the Almighty for the bountiful
harvest and pray for prosperity and good times in future

G. Long Answer Questions:

1. (a) What are weedicides? (b) Name one weedicide. (c) What are the harmful effects of
weeds in the crop field?

Ans: Weedicides are chemicals that kill weeds (b) 2, 4-D and MCPA or Butachlor

(c) Weeds compete with the crop for water mineral and sunlight and therefore reduce
crop yield.

2.(a) Differentiate between manure and fertilizers. (b) What are the advantages of using
manure?

Ans: (a) Difference between manure and fertilizers.
Fertiliser

A fertiliser is an inorganic salt.
A fertiliser is prepared in factories.
A fertiliser does not provide any humus to the soil.
Fertilisers are very rich in plant nutrients like N,P,K

Manure

Manure is a natural organic substance
Manure can be prepared in the fields.
Manure provides a lot of humus to the soil.
Manure is relatively less rich in plant nutrients.

(b) Organic manure is considered to be better than fertilisers. It is because of the
following reasons to be

(a) It enhances the water holding capacity of the soil.

(b) It makes the soil porous, thus making the exchange of gases easy.

(c) It also improves the texture of the soil. (d) It increases the number of friendly
microbes.

HOTs

1. Why do farmers level the field before sowing?

Ans: For the uniform distribution of water and manure in a field, a farmer practices

2. During ploughing why is the land pressed lightly and not tightly?

Ans: This is because loose soil allow root to breathe easily and allow root to penetrate
deeper .Loose soil also help in the growth of earthworm and microbes that provide
nutrients to soil.

8th food production and management (Cordova Mastering science-8 ) solution
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8th Science Important Science question with Answer for final Exam 2018

27/2/2018

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8th science solved test questions cps 2018
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DAV sample question papers 2017-18 for class 8 new

25/1/2018

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DAV sample question papers with Marking Scheme class - VIII (Term - I & II) 2017-18

In order to enable the teachers and students to prepare well for the Annual
Examination at the end of the academic session 2017-18, the DAV Centre for
Academic Excellence provides Sample Question Papers. It is hoped that these
sample question papers will certainly improve the classroom transaction of the
subject matter in our schools. These Sample Question Papers have been prepared
by practicing teachers of DAV Public Schools under the guidance of experienced
resource persons in workshops conducted by the DAV Centre for Academic
Excellence.

DAV class8 Solved question paper 2017-18 New
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8th Maths DAV question Bank 2017-18 New
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jsuniltutorial Living science solution class8

5/8/2017

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Force and Pressure Class 8 Living Science Solution
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8th Reflection of sound_living science answer
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8th Refraction and dispersion living science solution
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Class8 Natural phenomena (living Science) answer
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8th Our universe living science solution
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8th Synthetic Fiber_plastic (Living science answer)
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8th Metals and Non metals solution(living science)
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8th combustion and flame living science solution
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8th Conservation of plants and animal Living science solution

27/7/2017

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For Formative and Summative Assessment
A. 1. b 2. a 3. d 4. b 5.d 6. a 7. c 8. b
B. 1. Biodiversity means the variety of plants, animals and microorganisms generally found in an area.
2. `Flora' refers to plants.
3. Yes - I agree
4. False
5. Erosion
6. Overgrazing
7. True
8. renewable
9. extinct
10. forest
11.True
12. trees
13. endemic
14. endangered
C.1. Biodiversity is the variety of plants, animals and microorganisms generally found in an area.
2. Flora: Species of all plants found in a particular area is known as flora of that area. Fauna: Species of all animals found in a particular area is known as fauna of that area.
3. Cutting down forests and using the land for other purposes is known as deforestation.
4. Some animals cannot adjust to the environmental changes and begin to die. These animal species become endangered as their population becomes very small.
5. A biosphere reserve is a large protected area set aside for conservation of wildlife, plant, animal and microorganism resources, and the traditional life of the tribals living in that area.
6. Endemic species are those species of plants and animals that are found exclusively in a particular area and are not naturally found anywhere else. For example, the Indian giant squirrel and flying squirrel are endemic to the Pachmarhi Biosphere Reserve area.
7. IUCN prepared Red Data Book to highlight those animals who are threatened with extinction, with the aim of promoting their conservation. Those threatened with extinction.
8th Conservation of plants_animal science solution
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Quiz on Mahatma Gandhi by jsunil tutorial

CBSE Class8 Science Metals and Non metals solutions

cbse class 8 science Solved Test paper for Chapter Sound

Class 8th Conservation of plants and Animals

8th Micro organism Solution Cordova Learning science 2018-18

8th Chapter Crop production and Management (Cordova Science solution) 2018

8th Science Important Science question with Answer for final Exam 2018

DAV sample question papers 2017-18 for class 8 new

jsuniltutorial Living science solution class8

8th Conservation of plants and animal Living science solution

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