Question

Plz ans all the ques
1.) State the characterstick feature of miners and protista on the basis of their nuclear.
2.) A girl is running along a circular path with a uniform speed. How much work is done by the girl ?
3.) How does AIDS spread?
4.) When a body is fully immersed in a liquid, the apperant loss in its weight is _____
5.) While studying the reflection of the sound, four students A,B,C,and D used different reflecting surfaces. Who would obtain the best result and why ?
A) a thermacol sheet
B) a polished, plane metal sheet
C) a rough cardboard sheet
D) a cushioned chair

Note :- ans only if u r sure of ur answers
Points:- 50

Answer 1

A) monera- monera are the organisms which do not have a well defined nucleus and organelles. they are prokaryotik which do not have a nuclear membrane.
protista- protista are the organisms on the other hand which have a well defined nucleus with a nuclear membrane. they are eukaryotes.

B) when a body moves across a circular path then the work done by the body is zero this is because every point on the circular side forms an angle of 90° with the center and :
work done = cos 90° × displacement
work done = 0× displacement
that is zero work done.

C)AIDS is a virus that is spread through sexual contact, through infected vaccines, from mother through her child durind development of foetus or during breast feeding.

D) is equal to the amount of water displaced. this principle is Archimedes principle.

E)a polished plane metal sheet (d) part.


HOPE THIS HELPED YOU.

Answer 2

1.) State the characteristic feature of miners and protista on the basis of their nucleus
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protista are eukaryotic which means  they have  membrane-bound organelles, and nucleusmonerans are prokaryotes which means that lacks a membrane-bound organelles and nucleus
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2.) A girl is running along a circular path with a uniform speed. How much work is done by the girl ?
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work done will be zero as a tangent of 90 degree can be drwan at any point of the circle
work done = force x displacement x cos 90
as cos (90) is 0
work done will be zero
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3.) How does AIDS spread? 
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AIDS may get transmitted through blood (if the the person who donated his/her blood has AIDS) , syringes if it is used for a affected person and then not cleaned etc , it is passed through even sexual contact
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4.) When a body is fully immersed in a liquid, the apparent loss in its weight is _____
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When a body is fully immersed in a liquid, the apparent loss in its weight is equal to the amount of the water displaced by that object , it is given by the Archimedes principle 
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5.) While studying the reflection of the sound, four students A,B,C,and D used different reflecting surfaces. Who would obtain the best result and why ?
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B) a polished, plane metal sheet 
as metals are the best reflectors , the reflected sound can be heard properly and cushioned chair , thermacol sheet will absorb the sound and a rough cardboard cannot reflect the sound properly 
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