CBSE > Class 09 > Science | CBSE Board | Homework Help

A) we wear cotton clothes in summer because they absorb sweat quickly and gives a cool feeling during evaporation. B) water droplets form on the surface of the cold drink bottle because the water vapour present in air comes in contact with the cold drink bottle and change into liquid.

3Thank You

ANSWER

What is the mass of moon?

Posted by Tharun Tharun 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Aadharsh 07 7 years, 2 months ago

7.36×10 power 22

1Thank You

Nitin Singh 7 years, 2 months ago

1/6th the mass of earth

0Thank You

ANSWER

Calculate the number of moles, and number of atoms of H,S and O in 5 kole of H2S04

Posted by Abdullah Dabir 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

How we can make or complete lab manual of class-IX, how many experiment will have been written and which one from - Physics, Chemistry, Biology?

Posted by Anurag Pratap Singh 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Rohit Roy 7 years, 2 months ago

You Can Complete Your Lab Manual

1Thank You

ANSWER

Described the microscopic structure of cell

Posted by Shivansh Handa 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

In some organisms like bacteria, the nuclear region of the cell may be poorly defined due to the absence of a nuclear membrane. Such an undefined nuclear region containing only nucleic acids is called a nucleoid. Such organisms, whose cells lack a nuclear membrane, are called prokaryotes. Organisms with cells having a nuclear membrane are called eukaryotes. Prokaryotic cells also lack most of the other cytoplasmic organelles present in eukaryotic cells.

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ANSWER

Why do we keep both snake and turtle in the same cell

Posted by Shivansh Handa 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Draw the plant cell and label the part A. Synthesize food B. Produce energy C. Store house of organic substance like protein organic acids D. Packages material com from endoplasmic reticulum E. Determine function and ddevelopment of cell .

Posted by Shivansh Handa 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Raghu switched from trad to modern farming practices in which he used large amount of fertilizers and pesticide to gain an increase in profit . 1. What are the adverse effect of modern farming ? 2. What is soil pollution ? 3. What do you think will be effect of modern farming ? 4. What alternative method could be more beneficial for farming ?

Posted by Shivansh Handa 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 2 months ago

1.Adverse effect is;it spoil the soil fertility and can even cause water pollution if the pesticides or fertilisers used more.
2.soil pollution;soil pollution is something which make us to loose our topsoil and infertility.
3.effect;it may seems o be easy but it is harm full to our self in future4.alternative method is to use organic farming and make use of manures..

1Thank You

ANSWER

A sound wave has a frequency 2Hz and wavelength 40cm .How long will it take to travel 1.6 Km ?

Posted by Shivansh Handa 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Akanksha Kumari? 7 years, 2 months ago

Frequency = 2Hz Wavelength = 40cm= 40/100= 0.4m Thus velocity of sound wave = frequency × wavelength = 2×0.4 = 0.8m/s. Since speed = distance/ time 0.8 = 1.6 ×1000 / t 0.8 = 1600/ t Therefore t= 1600/0.8= 2000 seconds.

3Thank You

Gaurav Seth 7 years, 2 months ago

GIVEN:
frequency( n) =2kHz= 2 x 1000 Hz= 200Hz
[ 1kHz = 1000 Hz]
Wavelength(λ) = 40cm=40/100=0.4m
[ 1cm = 1/100 m]
Distance= 1.6km= 1.6x1000m = 1600 m
[1km = 1000 m]
Speed of sound(V)= frequency× wavelength
V =2000×0.4
V=800m/s
Speed=Distance/ time
Time= distance/ speed
Time = 1600/ 800
Time =2sec.
Hence, the time required to travel 1.6km is 2sec.

1Thank You

ANSWER

state the meaning of 1 Pascal. a boy of mass 40

Posted by Dalveer Ghuman 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Give some examples of isotones

Posted by Krishna Saxena 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Abhishek Dawer 7 years, 2 months ago

(Aluminium, silicon). ( Phosphorus ,sulphur). (Potassium ,calcium)

0Thank You

Abhishek Dawer 7 years, 2 months ago

(Lithium , beryllium) ,( sodium , magnesium)

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ANSWER

What are the uses of lignin,subernin and cutin

Posted by Shubham Shukla 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akanksha Kumari? 7 years, 2 months ago

Cutin - it helps to reduce waterloss by evaporation. It also helps in preventing the entry of pathogens. Suberin- it is an organic substance which thickens the cells. It makes the cell impermeable to water and gases. Lignin- it is a chemical substance which makes the cell wall thick and hard.

2Thank You

ANSWER

What is the inter croping

Posted by Taran Beniwal 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 2 months ago

ntercropping:Growing of two or more crops simultaneously on the same piece of land (field). There is a crop intensification in both time and space dimensions. There is intercrop competition during all or part of crop growth.

Type of intercropping:1. Mixed intercropping 2. Row intercropping 2. Strip intercropping4. Relay intercropping

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ANSWER

How first law of motion applies on flying of birds?

Posted by Itika Singhal 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Valency of an element Xis 3 write the chemical formula of its oxide

Posted by Nikhil Raman 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Abdullah Dabir 7 years, 2 months ago

X203

0Thank You

Latha Nani 7 years, 2 months ago

X 2o3

0Thank You

Akanksha Kumari? 7 years, 2 months ago

X2O3

0Thank You

ANSWER

Why sound is called as a form of energy?

Posted by Aditya Kumar Dangi 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Jagannath Arpit Das 7 years, 2 months ago

Energy is neither created nor destroyed nor wasted. It continues transforming.We know sound can be transformed to other energies like electric heat kinetic etc..So we call sound as an energy

1Thank You

ANSWER

What is xylem.

Posted by Shiv Sankar 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Neha Panwar 7 years, 2 months ago

Vascular tissue in plant which conducts with water and dissolved nutrients upward from the root and also help to form the Woody element in the stem.?

0Thank You

Aditya Kumar Dangi 7 years, 2 months ago

It is a conducting tissue present in plants which helps in transportationof water and minerals from the root to other parts of plant.

1Thank You

ANSWER

Show that the weight of an object on the moon is 1/6 of the weight on the earth

Posted by Shashank Barnwal 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why is atomic mass of chlorine 35.5u? Explain.

Posted by Nitu Sen 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

what is speed of sound at 0 degree celsius

Posted by Ankesh Yadav 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Jai Sandhu Jai Sandhu 7 years, 2 months ago

340m/s

0Thank You

David Singh 7 years, 2 months ago

0.01 second

1Thank You

ANSWER

Difference between thrust and pressure

Posted by Aman Shakya 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Vidhi Chauhan 7 years, 2 months ago

Thrust - The force acting on an perpendicular to the surface is called thrust Pressure - The thrust or force acting on unit area is called pressure

0Thank You

ANSWER

Which element has no neurons

Posted by Prithvi S 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Anshika Prakash 7 years, 2 months ago

Hydrogen's isotope protium has no neutrons.

0Thank You

Prithvi S 7 years, 2 months ago

Hydrogen

4Thank You

ANSWER

How do we liquefy the gas

Posted by Mayank Sharma 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Anshika Prakash 7 years, 2 months ago

By increasing pressure and decreasing temperature

1Thank You

Shashank Barnwal 7 years, 2 months ago

By compressing it & by decreasing temperature

1Thank You

Anshaj Pandey 7 years, 2 months ago

By compressing it.

0Thank You

ANSWER

Diagram of epithelial tissue?

Posted by Shanu Sharma 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Athul Manoj 7 years, 2 months ago

Epithelial tissue is a type of protective tissue which cover the body internally and externally.

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ANSWER

What is lichen ?

Posted by Nutan Mehta 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Latha Nani 7 years, 2 months ago

It has symbiotic relationship with fungus and algea

0Thank You

Jagannath Arpit Das 7 years, 2 months ago

Lichen is a tree from which litmus are extracted

0Thank You

Akanksha Kumari? 7 years, 2 months ago

Lichen is a symbiotic relation between fungus and algae.

1Thank You

ANSWER

What is atomic

Posted by Pragya Jaiswal 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Ishwari Ramade 7 years, 2 months ago

Atomic means substance consisting of uncombined atoms rather than molecules.

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ANSWER

Why 4 Centigrate temprature regarded as highest density point of water?

Posted by Amit Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Jagannath Arpit Das 7 years, 2 months ago

Because cooling water further from 4 degree celsius it expands due to anomalous effect of water.So its density decreases when we further cool it from 4 degree celsius.So water at 4 degree celsius has highest density

1Thank You

ANSWER

Define: 1. Rectilinear motion 2. Curvilinear motion 3. Circular motion

Posted by Shivansh Handa 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akanksha Kumari? 7 years, 2 months ago

1. Rectilinear motion- It is the motion of a body in straight line in which the velocity remains constant. 2. Curvilinear motion- It is the motion of a body along a curved way in which the velocity keeps changing. 3. Circular motion- It is the motion of a body along the circumference of a circular path.

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