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

Factors affecting rate of evaporation are Wind -wind high , evaporation high Humidity- humidity high, evaporation low Temprature- temp high, evaporation high Surface area more surface area,more evaporation

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Shravan Tukaram Jagtap 1 year, 7 months ago

The presence of a breeze, a powerful wind, or some other form of air circulation can speed up this process and make the environment of the liquid less humid. Therefore, by decreasing the humidity of the liquid's surrounding, a powerful breeze or wind can increase the rate at which the liquid evaporates

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The rate of diffusion will be higher in

Posted by Shivani Tyagi Shivani Tyagi 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Sarthki Kulkarni 1 year, 6 months ago

gases

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Kangna Arora 1 year, 7 months ago

gases

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Why is atom a neural??

Posted by Ansh Yadav 1 year, 7 months ago

CBSE > Class 09 > Science

3 answers

Kangna Arora 1 year, 7 months ago

Because the no of protons and electrons are same and neutrons have no charge

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Shivani Tyagi Shivani Tyagi 1 year, 7 months ago

The number of protons (positively charged) and electrons (negatively charged) are equal in an atom. Therefore the opposite charges are balanced and thus there is no net charge on the atom. Moreover, neutrons present in the atom have no charge. Hence an atom is electrically neutral.

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Shivani Tyagi Shivani Tyagi 1 year, 7 months ago

Not neural neutral

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Functions of animal cell ?

Posted by Aditi Malviya 1 year, 7 months ago

CBSE > Class 09 > Science

1 answers

Neeharika Rai 1 year, 7 months ago

It helps in oxidation of food making of energy in form of ATP

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Case based questions for chapter 5 cell

Posted by Ekamdeep Brar 1 year, 7 months ago

CBSE > Class 09 > Science

1 answers

Nikita Singh 1 year, 7 months ago

Hello can you send me this same chapter case study if you find

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What is ultra Sonic waves

Posted by Sunny Yaduvanshi 1 year, 7 months ago

CBSE > Class 09 > Science

3 answers

Nikita Singh 1 year, 6 months ago

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Priyanshi Singh 1 year, 7 months ago

Ultra Sonic waves are the waves which have the frequency more than 20kilo hertz. It is inaudible to humans but many animals such as bat, dolphin etc are able to hear it. There are also many applications of it and one of them is SONAR.

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Sunny Yaduvanshi 1 year, 7 months ago

Ultra Sonic waves is ultra waves

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What are the major functions of blood

Posted by Gulshan Yadav 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Chandan Kumar 1 year, 7 months ago

219644

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Gulshan Yadav 1 year, 7 months ago

[1] It transport substance like nutrient , metabolic waste , gases (oxygen and carbon ) and hormones within the body [2] Red blood cells are involved in transport of oxygen and carbon dioxide in ten body [3] Blood platelets help in coagulation of blood at the site of injury

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A siren is fitted on a car which is moving with a velocity of 36 km/hr. A motorist moving with a velocity of 18 km/h heard siren sound at a frequency of 500 c.p.s for the relative motion between the car (source of sound) , the motorist(listener or observer ) and intervening medium, you will find that the apparent frequency of sound heard by the motorist( listener or observer) is different from the actual frequency of sound emitted by the car ( source). This is due to Doppler's effect in sound which is basically is the motion related charge in the frequency of sound. 1. Calculate the actual frequency, when the car and the motorist are moving in opposite direction and approaching each other. ( Take velocity of sound in air =330m/s)

Posted by Puneet Agarwani 1 year, 7 months ago

CBSE > Class 09 > Science

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A form of matter that has no fixed shape and has no fix volume and example of this form of matter is a carbon dioxide b ice c water vapour d kerosene

Posted by Reena Choudhary 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Mahi Sarda 1 year, 7 months ago

a carbon dioxide

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Anshu Yadav 1 year, 7 months ago

C.water vapour

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WHY SUGAR REACT WITH COLD DRINK (SPRITE)??? चीनी स्प्राइट के साथ रियेक्ट क्यूँ करता है??

Posted by Ravi Raj 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Tanmay Badwal 1 year, 7 months ago

Sugar can not react with cold drinks but salt can

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Shreshta Jha 1 year, 7 months ago

I don't know

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Why are potassium and sodium metals stored under kerosene?

Posted by Thanziya Tanziya 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Mahi Sarda 1 year, 7 months ago

Because they are highly reactive metal and catch fir easily

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Keshav Kumar 1 year, 7 months ago

Because potassium and sodium is most reactive element it react with oxygen fastly

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Can the lemon pickles be stored in an aluminium container?why

Posted by Thanziya Tanziya 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Shlok Bh 1 year, 7 months ago

No , because if we stored lemon pickle in aluminum containers the lemon pickle react with aluminum containers and become toxic which is not good for our health

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Chirag Kr. Jha 1 year, 7 months ago

No, because citric acid can react with aluminium and can form toxic salts

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If the humidity in air increases then the rate of evaporation i) Decreases ii) Increases iii) Remains Same iv) None of the above

Posted by Juee Pandit 1 year, 7 months ago

CBSE > Class 09 > Science

3 answers

Mrunali Salunke 1 year, 6 months ago

Decrease

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Keshav Kumar 1 year, 7 months ago

Decrease

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Anshuman Mishra 1 year, 7 months ago

I) Decreases

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When 3.0g of carbon is burnt is 8.00g oxygen ,11.00g of carbon dioxide will be formed when 3.00g of carbon is burnt in 50.00g of oxygen which law of chemical combination will govern your. Answer

Posted by Priya Subiksha 1 year, 7 months ago

CBSE > Class 09 > Science

4 answers

Gayatri Gps 1 year, 6 months ago

Law of constant proportion

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Shlok Bh 1 year, 7 months ago

Law of constant proportion

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Yuvarajan Andaman 1 year, 7 months ago

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Srishti Singh 1 year, 7 months ago

Our answer will be governed by the law of constant proportions. Now, since carbon and oxygn combine in the fixed proportion of 3 : 8 by mass to produce 11 g of carbon dioxide, therefore, the same mass of carbon dioxide (11 g) will be obtained even if we burn 3 g of carbon in 50 g of oxygen. The extra oxygen (50 – 8 = 42 g oxygen) will remain unreacted.🙂

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What is cell and their funsition

Posted by Raman Banjare 1 year, 7 months ago

CBSE > Class 09 > Science

3 answers

Aaditya Kumar 1 year, 7 months ago

Cell is the basic structural and functional unit of life. Functions of cells are following: 1. Controls all the metabolic activities of the body. 2. Helps in formation of tissues which later on form an organ

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Ummul Kiram Sadri Wala 1 year, 7 months ago

Cell is basic fundamentals unit of life which helps in buliding of body and helps in metabolic activity

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Aadrian Misra 1 year, 7 months ago

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a bodybuilding lifts a dumbbell of 10 kg raises it 2m above the ground. calculate the work done by him on lifting the weight

Posted by Kartik Choudhary 1 year, 7 months ago

CBSE > Class 09 > Science

5 answers

Sudhir Kumar 1 year, 7 months ago

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Anshuman Mishra 1 year, 7 months ago

Work done = Change in P. E. =∆P.E. = mgh m =10 kg, g=9.8ms^-2, h=2 m W =10 ×9.8×2 = 98 ×2 = 196 J

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Priyansu Kumar Sahoo 1 year, 7 months ago

Work done=Force* Displacement=Weight*Displacement=mgs =(10*9.8*2)J =196J

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Shourya Verma 1 year, 7 months ago

196 joule

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Priyansu Kumar Sahoo 1 year, 7 months ago

Work done is zero

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Posted by Sudhir Kumar 1 year, 7 months ago

CBSE > Class 09 > Science

3 answers

Tapashya Sharma 1 year, 7 months ago

wyw

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Priyansu Kumar Sahoo 1 year, 7 months ago

🌹

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Rishabh Kumar 1 year, 6 months ago

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What would have happened if nature had not allowed the transformation of energy??

Posted by Nikhil Malagar 1 year, 7 months ago

CBSE > Class 09 > Science

5 answers

Shravan Tukaram Jagtap 1 year, 7 months ago

Solution: If the transformation of energy would have not been allowed by the nature, then many of the processes would have failed to occur. Simple things like cooking food would have not been possible. Similarly, growth in the body would have been hampered as the stored food energy would not have been converted.26-Sept-2018

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Priyansu Kumar Sahoo 1 year, 7 months ago

If the transformation of energy would have not been allowed by the nature, then many of the processes would have failed to occur. Simple things like cooking food would have not been possible. Similarly, growth in the body would have been hampered as the stored food energy would not have been converted.

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Sahilsingh Kajal 1 year, 7 months ago

Then we would know be living like as we live now

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Priyansu Kumar Sahoo 1 year, 7 months ago

Then we would know be living like as we live now

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Sudhir Kumar 1 year, 7 months ago

🤔🤔🤔

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Diffrence between active and passive transport.

Posted by Ashish Prajapati 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Ashish Prajapati 1 year, 6 months ago

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Priyansu Kumar Sahoo 1 year, 7 months ago

Active transport requires energy for the movement of molecules whereas passive transport does not require energy for the movement of molecules. In active transport, the molecules move against the concentration gradient whereas in passive transport, the molecules move along the concentration gradient.

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Chapter 8

Posted by Lucky Pathariya 1 year, 7 months ago

CBSE > Class 09 > Science

3 answers

Vanshika Tangri 1 year, 6 months ago

Motion chapter search on goggle

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Debayan Kar 1 year, 6 months ago

Motion

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Sudhir Kumar 1 year, 7 months ago

What???

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Calculate the number of molecules in 53g of na2co3

Posted by Vivek Gupta 1 year, 7 months ago

CBSE > Class 09 > Science

1 answers

Priyansu Kumar Sahoo 1 year, 7 months ago

Given mass=53g Molar mass of Na2CO3 = 23×2+12+48 = 46+60= 106g No. Of moles = given mass /molar mass = 53/106 =0.5 Now 1 mole = 6.02×10^23 atoms So, 0.5 moles = 0.5×6.02×10^23. = 3.010×10^23 atoms

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How to convert energy of substance in one form to another form when a substance falling down on the earth find out different energies in A,B,C point

Posted by Anshika Negi 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Sudhir Kumar 1 year, 6 months ago

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Ashish Prajapati 1 year, 6 months ago

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What is the most important question of tissue chapter.

Posted by Aaditya Kumar 1 year, 7 months ago

CBSE > Class 09 > Science

2 answers

Priyansu Kumar Sahoo 1 year, 7 months ago

What are different types of tissue

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Anshika Khatana 1 year, 7 months ago

Whole chapter is important

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Write a short note on nucleus of a cell.

Posted by Sesha Sangani 1 year, 7 months ago

CBSE > Class 09 > Science

1 answers

Aadrian Misra 1 year, 7 months ago

NUCLEUS: 1. Has a double layer membrane called nuclear membrane. 2. It encloses with liquid ground substance called nucleoplasm. 3. Chromatin material & nucleus flow in nucleoplasm. 4. Nuclear membrane has small pores on it called nuclear pores. It helps in transfer of materials from nucleus to cytoplasm to other oraganlles. 5. Whenever cell divides the chromatin material gets organised into chromosomes. 6. Chromosomes are structures which have their own DNA (Deoxiribo Nuclic Acid) and ribosomes.

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Who was chaman

Posted by Prasanna V.Prasanna 1 year, 7 months ago

CBSE > Class 09 > Science

3 answers

Tapashya Sharma 1 year, 7 months ago

chintu ka dost

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Vivek Gupta 1 year, 7 months ago

Binod ka papaji

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Sudhir Kumar 1 year, 7 months ago

Hamari gali ka doctor 🤪

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Posted by Prasanna V.Prasanna 1 year, 7 months ago

CBSE > Class 09 > Science

5 answers

Sudhir Kumar 1 year, 6 months ago

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Anshu Kumari 1 year, 7 months ago

Yeh Kay ho ta h

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Kanika Verma 1 year, 7 months ago

☺

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Tausif Ur Rahman 1 year, 6 months ago

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Prasanna V.Prasanna 1 year, 7 months ago

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What is mitosis and meosis

Posted by Priya Bachketi 1 year, 7 months ago

CBSE > Class 09 > Science