Class 8
Heaviest natural element in periodic table is. A.Carbon B.Xenon C.Uranium D.promethium?
Aditya Bose answered • 3 hours agoAns is C- Uranium
C.N.G. and L.P.G. burn with sooty flame- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
C.N.G. and L.P.G. burn with sooty flame
a)
True
b)
False
Rajbala answered • 4 hours agoThey burn produced blue flame ,so they burn with a sooty flame.The blue is called "chemoluminescence". It's the light produced directly by the combustion reaction, and will therefore be present during most hydrocarbon fires. The yellow and orange (which provide most of the light from the actual fire) come from a more interesting source. When hydrocarbons burn without sufficient oxygen mixed in, they burn incompletely. This reaction produces tiny particles of solid carbon, which we generally refer to as 'soot'. The flame is full of this finely dispersed carbon, which gets heated by the combustion. A typical wood fire produces flames anywhere from 1000 K to 2000 K. At that temperature, the particles glow, giving off orange to yellow light. Those tiny bits of superhot carbon is what causes most of the light we see from fires.
Gas burners are generally designed to mix plenty of air in with the gas before it burns. so that incomplete combustion doesn't happen, soot doesn't get produced, and so all you see is the blue from the combustion. But if you block some of the air from getting into the burners, you'll find that gas flames burn just as yellow as wood.
The moist bread becomes mouldy after a few days when it is left in a container with a cover. Which of the following conditions favour the growth of the fungus?- a)Absence of water
- b)Absence of light
- c)Presence of sunlight
- d)Presence of carbon dioxide
Correct answer is option 'B'. Can you explain this answer?
The moist bread becomes mouldy after a few days when it is left in a container with a cover. Which of the following conditions favour the growth of the fungus?
a)
Absence of water
b)
Absence of light
c)
Presence of sunlight
d)
Presence of carbon dioxide
Amarjit Singh answered • 4 hours agoIf a piece of bread is kept in a container in a moist place for two to three days, some light type of hairy growth may happen on the surface. It is generally referred to as the bread mold. It is a kind of fungus. The absence of light and moist temperature favour the growth of the fungus.
badlu lekhak ki khatirdari Kaise Karta Tha Related: Summary - लाख की चूड़ियां?
Related: Summary - लाख की चूड़ियां
Sakshi Mehandirata answered • 4 hours agoBdlu usse mlai, aam khilaya krta tha lekhak ke liye bchiya mamgvaya krta
what is Destructive Distillation??
Harini Pragalathan answered • 4 hours agoThe process of heating of coal in the absence of air is called as destructive distillation of coal. The products obtained on destructive distillation of coal are coke, coal gas, coal tar, and ammoniacal liquor.
Chandana Sancheti asked • 33 minutes agoUsing appropriate property find -2/3×3/5+5/2-3/5×1/6 Answer is 2 explain?
what is chromosomes Related: Unicellular and Multicellular?
Related: Unicellular and Multicellular
Harini Pragalathan answered • 4 hours agoChromosomes are thread-like molecules that carry hereditary from height to eye colour. They are made of protein and one molecule of DNA, which contains an organism's genetic instructions, passed down from parents.
The hottest planet in the solar system is- a)Mercury
- b)Jupiter
- c)Venus
- d)Mars
Correct answer is option 'C'. Can you explain this answer?
The hottest planet in the solar system is
a)
Mercury
b)
Jupiter
c)
Venus
d)
Mars
Bhavya Pawar answered • 6 hours agoVenus bcoz it's atmosphere is like this that all the sun Ray's can go inside it's atmosphere but can't come back
Abdur Rahman asked • 53 minutes agoExplain the term time-span in connection with historical events?
The value of x in the following figure is
- a)100o
- b)90o
- c)72o
- d)120o
Correct answer is option 'C'. Can you explain this answer?
The value of x in the following figure is
a)
100o
b)
90o
c)
72o
d)
120o
Aasim Shaikh answered • 7 hours agoThe correct option is c because the sum of each angle of pentagon is 360 and the pentagon has 5 side so
360/5=72
360/5=72
explain the position and function of nucleus in acell?
Aasim Shaikh answered • 7 hours agoIts functions are The nucleus provides a site for genetictranscription that is segregated from the location of translation in the cytoplasm, allowing levels of gene regulation that are not available to prokaryotes. The main function of the cell nucleus is to control gene expression and mediate the replication of DNA during thecell cycle.
The nucleus is an organelle found in eukaryotic c... more
The nucleus is an organelle found in eukaryotic c... more
what are the principal of sustainable development?
Aasim Shaikh answered • 7 hours ago1.respect and care for all forms of life
2.improve the quality of human life
3.conserve the earth's vitality and diversity
2.improve the quality of human life
3.conserve the earth's vitality and diversity
how did the white ruler cripple Indian industry?
Harini Pragalathan answered • 9 hours agoThe white rulers were chiefly traders. Their chief aim was to make profits at all cost. Hence, they began to ruin the Indian industries.
Salt is spread on pavement snow during winter in cold countries?
Harini Pragalathan answered • 9 hours agoThe reason why salt is spread on pavement snow during winter in cold countries is because this practice lowers the freezing point of the water that forms the ice which makes the ice melt and prevents snow to collect on the pavements.
What is stereotyping?
Harini Pragalathan answered • 9 hours agoA stereotype is a mistaken idea or belief many people have about a thing or group that is based upon how they look on the outside, which may be untrue or only partly true. Stereotyping people is a type of prejudice because what is on the outside is a small part of which a person is.
human being are an important resources.justify the stete Related: Resources (Overview)?
Related: Resources (Overview)
Kalpana Friends answered • 9 hours agoHuman resources include the people of a country involved in various profession. Human posses knowledge, social and personal attributes, creativity, competencies and the ability to work in order to produce goods of economic value. Humans are the most important resources they are instrumental in the best utilisation of natural resources
What are actual and potential resources Related: Resources (Overview)?
Related: Resources (Overview)
Kalpana Friends answered • 9 hours agoActual resources are the ones which are being utilised by humans. The rich coal deposit found in the Appalachian regions of eastern USA and the mineral oil deposits of West Asia are examples of actual resources.
potential resources are the ones which are not being used by humans at present but have the potential of providing great benefits if use. Sunlight has the potential for meeting... more
potential resources are the ones which are not being used by humans at present but have the potential of providing great benefits if use. Sunlight has the potential for meeting... more
Sandipan Bedade asked • 4 hours agoFor an object, which needs more heating energy - melting or boiling?
Rahul Vasdev asked • 6 hours agoWhich of the following options is/are true about the diseases, microorganisms which cause them and the symptoms of the diseases?- a)Malaria, Protozoan, Fever and Chills
- b)Hepatitis B, Virus, Swollen liver
- c)Cholera, Virus, Vomiting, diarrhea
- d)Both (A) and (B)
Correct answer is option 'D'. Can you explain this answer?
Which of the following options is/are true about the diseases, microorganisms which cause them and the symptoms of the diseases?
a)
Malaria, Protozoan, Fever and Chills
b)
Hepatitis B, Virus, Swollen liver
c)
Cholera, Virus, Vomiting, diarrhea
d)
Both (A) and (B)
Dr Aanal Mehta asked • 7 hours agoNumbers 1 to 10 are written on ten separates slips (one number on one slip), kept in a box and mixed well. One slip is chosen from the box without looking in to it.Q. What is the probability of getting a number greater than 6?- a)1
- b)0
- c)1/2
- d)1/10
Correct answer is option 'D'. Can you explain this answer?
Numbers 1 to 10 are written on ten separates slips (one number on one slip), kept in a box and mixed well. One slip is chosen from the box without looking in to it.
Q. What is the probability of getting a number greater than 6?
a)
1
b)
0
c)
1/2
d)
1/10
Raja Gurjar asked • 9 hours agoदिए गए विकल्पों में से निम्नलिखित प्रश्नों के सही उत्तर का चयन कीजिएः
प्रशन:बाज की करुण चीख सुनकर साँप के मन पर क्षण भर के लिए क्या प्रभाव पड़ा? - a)साँप भयभीत हो उठा
- b)बाज के प्रति घृणा जाग उठी
- c) बाज से बदला लेने की भावना जाग उठी
- d)उसके मन में उस आकाश के प्रति इच्छा जाग उठी
Correct answer is option 'A'. Can you explain this answer?
दिए गए विकल्पों में से निम्नलिखित प्रश्नों के सही उत्तर का चयन कीजिएः
प्रशन:बाज की करुण चीख सुनकर साँप के मन पर क्षण भर के लिए क्या प्रभाव पड़ा?
प्रशन:बाज की करुण चीख सुनकर साँप के मन पर क्षण भर के लिए क्या प्रभाव पड़ा?
a)
साँप भयभीत हो उठा
b)
बाज के प्रति घृणा जाग उठी
c)
बाज से बदला लेने की भावना जाग उठी
d)
उसके मन में उस आकाश के प्रति इच्छा जाग उठी
Fetching relevant content for you
Ask a question
Related Courses
Follow Us
