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

Adolf Hitler knew that both France and Britain were militarily stronger than Germany,. However, he became convinced that they were unwilling to go to war. He therefore decided to break another aspect of the Treaty of Versailles by sending German troops into the Rhineland.

0Thank You

Hani Soni 3 years, 6 months ago

Eggs of plant

0Thank You

ANSWER

What are the limitations of Rutherford Model of an atom?

Posted by Tanuj Sharma 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Rashmi Pathak 3 years, 6 months ago

Rutherford did not mention anything about the arrangement of electron in the orbit. Rutherford’s model was inadequate to explain the stability of an atom

0Thank You

Keshav Tomar 3 years, 6 months ago

Rutherford's model was inadequate to explain the stability of an atom. It did not mention anything about the arrangement of electron in the orbit.

0Thank You

ANSWER

Example of balancing eauatio

Posted by Yashraj Mudgil 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Umam Fatima 3 years, 6 months ago

Hindi

0Thank You

Karan Joshi 3 years, 6 months ago

2h2o-->4h+o2

1Thank You

Malladi Sriram 3 years, 6 months ago

CO2+h2o=h2co3

1Thank You

ANSWER

It has been observed that despite the availability of the vaccine for Hepatitis A in the market, It may not be necessary to be given to children by the time they are five years old. Why ?

Posted by Reena Thakur 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Devika K 3 years, 6 months ago

Because they are exposed to the virus through water

1Thank You

ANSWER

Anyone can explane me atomic mass plsssss

Posted by Tabrez Khan 3 years, 6 months ago

CBSE > Class 09 > Science

4 answers

User Me 3 years, 6 months ago

Atomic mass=the sum of nucleons (proton +neutron )

1Thank You

Tanuj Sharma 3 years, 6 months ago

Atomic mass means the mass of the atom is defined as 1/12 of mass of atom of carbon isotope.

1Thank You

Tejal Tejal 3 years, 6 months ago

Atomic mass mean the mass of the atom is defined as 1/12of mass of atom of carbon isotope

1Thank You

Shreya Bali 3 years, 6 months ago

The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

1Thank You

ANSWER

In case of zero work, the angle between the force and displacement is a) 0 ° b) 45° c) 90° d) 180°

Posted by Rahul Sharma 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Asmith Prabhav 3 years, 6 months ago

90 degree

0Thank You

Rashmi Pathak 3 years, 6 months ago

90°

0Thank You

Tanuj Sharma 3 years, 6 months ago

90°

0Thank You

Bhavesh B Nair 3 years, 6 months ago

0Thank You

Adarsh Kumar 3 years, 6 months ago

Angle 90 degree

1Thank You

ANSWER

Difference between antibiotics and vaccine

Posted by Harshita Gangwani 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Sharma Pratik 3 years, 6 months ago

Vaccine are right to be used for protection against potential future infection. Vaccines are designed to induce a relative immune response in your body. Antibiotics are effective for stopping the reproduction process of bacteria and do not have any effect on viruses. These are also not to be used for preparing for potential future ☺️ infection,but rather for when ther is a currant bacterial infections.

1Thank You

ANSWER

A ball is thrown vertically upwards with a velocity of 5 m/s. Calculate the maximum height reached by the ball.

Posted by Arjun Suresh 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Baby Bushra Siddiqe 3 years, 6 months ago

u=5m/s, v=o, g=-10m/s, h=? According to the third equation of motion, 2gh=v^2-u^2 2×(-10)×h=0^2-5^2 -20h=25 h=25/20 h=1.25m

0Thank You

ANSWER

Define the term "tissue"

Posted by Asha Bhavana 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Shiva Singh 3 years, 6 months ago

Group of cell is called tissue

0Thank You

Harshita Gangwani 3 years, 6 months ago

A group of cells that are similar in structure and/or work together to achieve a particular function forms a tissue

1Thank You

Abhiram Deepak 3 years, 6 months ago

A group of cells that has a similar structure and/or work together to achieve a particular function is called a tissue.

0Thank You

Jyotiraditya Shinde 3 years, 6 months ago

When 2 or more cell bound together. This is tissue.

1Thank You

Riya Singh 3 years, 6 months ago

The structural unit of an organism

0Thank You

ANSWER

a flower pots dropped from the age of the roof of a multi storied building calculate the time taken by the port to cross a particular distance ab of hai to decimal 9 metre the upper point 19 December 6 below the rope

Posted by Pappu Das 3 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Which is known as graveyard of RBC

Posted by Farhan Ahmed 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Farhan Ahmed 3 years, 6 months ago

Not spleem spleen

0Thank You

Jyotiraditya Shinde 3 years, 6 months ago

Spleem

1Thank You

Farhan Ahmed 3 years, 6 months ago

Spleen

2Thank You

ANSWER

A wicket keeping gloves is dropped from a height of 40 m and simultaneously E A ball is thrown upward from the ground with a speed of 40 metre per second when and where they will meet

Posted by Ayush Pandey 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Jyotiraditya Shinde 1 year, 7 months ago

They will meet at height of 30m

1Thank You

ANSWER

Chapter 8 important question for exam

Posted by Mohd Akhtar 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Harshita Gangwani 3 years, 6 months ago

All the 3 formulas of motion are important...from my point of view....we just need to understand the chapter and our application should be perfect..thats it

1Thank You

Aryan Soni 3 years, 6 months ago

All chapter is important

1Thank You

Hisham Ichoo 3 years, 6 months ago

Read the text fully note the important points make a summery chart and study well

2Thank You

Niharika Sumant (Jiya) 3 years, 6 months ago

Important question of chapter 8 I only prefer to read and understand whole chapters (by this you can answer any question from the chapter) understand chapter in simple way as you can.

2Thank You

Ansh Rana 3 years, 6 months ago

Vjc

2Thank You

ANSWER

Who is the father of science ?

Posted by Digvijay Singh ?? 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Ayush Pandey 3 years, 6 months ago

Galileo Galilei

1Thank You

Hisham Ichoo 3 years, 6 months ago

I think it is Galileo Galilei

1Thank You

Geetha Sri 3 years, 6 months ago

Galileo Galilei was the father of science

1Thank You

Niharika Sumant (Jiya) 3 years, 6 months ago

The Father of Science is Mr. Galileo Galilei.

1Thank You

Afsana Ahmad S 3 years, 6 months ago

GALILEO GALILEI

1Thank You

ANSWER

What are (ER) Endoplasmic reticulum

Posted by Niharika Sumant (Jiya) 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Arya 815X 3 years, 6 months ago

Endoplasmic reticulum, a continuous membrane system in eukaryotic cells that plays an important role in the biosynthesis, processing, and transport of proteins and lipids.

2Thank You

Arya 815X 3 years, 6 months ago

Endoplasmic reticulum (ER), in biology, a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells and serves multiple functions, being important particularly in the synthesis, folding, modification, and transport of proteins . All eukaryotic cells contain an endoplasmic reticulum (ER). In animal cells, the ER usually constitutes more than half of the membranous content of the cell. Differences in certain physical and functional characteristics distinguish the two types of ER, known as rough ER and smooth ER.

2Thank You

Niharika Sumant (Jiya) 3 years, 6 months ago

But in detail please

0Thank You

Keshav Garg 3 years, 6 months ago

It is a type of cell organalle which had its own ribosomes and DNA

2Thank You

Niharika Sumant (Jiya) 3 years, 6 months ago

And their types

0Thank You

ANSWER

Please give me science sample paper 9

Posted by Prarthana Gowda 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Jyotiraditya Shinde 3 years, 6 months ago

Same here

0Thank You

Jyoti Shiwal 3 years, 6 months ago

I also want pls...

2Thank You

ANSWER

How to calculate Atomic mass?

Posted by Niharika Sumant (Jiya) 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Rituraj K 3 years, 6 months ago

Also we calculate atomic mass by no. Of protons + no. Of neutrons

1Thank You

Yashika Yadav 3 years, 6 months ago

Atomic mass is based on the number of protons present in it's nucleus.

1Thank You

Yashika Yadav 3 years, 6 months ago

Each element has different atomic mass, they are based on the numbers of protons and neutrons present in atom's nucleus

2Thank You

Niharika Sumant (Jiya) 3 years, 6 months ago

0Thank You

Uplaksh Goel 3 years, 6 months ago

You have to learn them...

2Thank You

ANSWER

Difference Between Meristematic Tissue and Permanent Tissue???

Posted by Yash Malik 3 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Baby Bushra Siddiqe 3 years, 6 months ago

When cells have capacity to divide at certain place,which is responsible for the growth of plant is called MERISTEMATIC TISSUES. When cells lost their dividing capacity then it is called a PERMANENT TISSUES.

0Thank You

Hisham Ichoo 3 years, 6 months ago

1Thank You

Harsimran Grewal 3 years, 6 months ago

Meristematic tissue -three types-apical Meristematic, lateral Meristematic,intercalary Meristematic. Responsible for growth.Present at locations where plants grow like roots, stems. Cells can divide to form new cells. Permanent tissues -two types-simple and complex permanent tissues. Made up of those cells which have lost their capability to divide. They have definite shape, size, thickness.They may be dead or living.

2Thank You

Digvijay Singh ?? 3 years, 6 months ago

Meristematic tissues in plants consist of a mass of undifferentiated cells whose main function is to participate in plant growth. Permanent tissues, on the other hand, are differentiated tissues, carrying out dedicated functions.

2Thank You

ANSWER

What was the drawback of rutherford’s model of an atom?

Posted by Zoya Temrikar 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Vasudha Kakkat 3 years, 6 months ago

Inadequate to explain the stability of the atom Failed to explain the arrangement of electrons

0Thank You

Geetha Sri 3 years, 6 months ago

This atomic model failed to explain stability of atoms. According to the model, electrons revolve around the positively charged nucleus. It's not possible for a long run as we know atoms are stable while any particle in a circular orbit would undergo acceleration.

1Thank You

Aditya Kandpal 3 years, 6 months ago

The drawback of Rutherford model of an atom is that it does not explain the stability of an atom. According to Rutherford model of an atom electron move around nucleus in circular orbit and while moving electron would radiate energy and undergo acceleration and then merge with the nucleus. Hence the electron is not stable in this case

1Thank You

ANSWER

Calculate the mass percentage of oxygen present in water

Posted by Vedansh Dubey 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Priyanshu Kumar Singh 3 years, 6 months ago

Mass of water= 18 u Mass of oxygen =16u Mass%= 16/18×100 =88.88%

1Thank You

ANSWER

What is the Newton second law of motion

Posted by Shakti Kumar 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Tarunpreet Singh💯💯 3 years, 6 months ago

It states that rate of change of momentum is directly proportional to the applied force and takes place in the direction in which force is applied.

1Thank You

Archana Rawat 3 years, 6 months ago

Newton's second law of motion states that acceleration of an object is directly proportional to the force applied and inversly proportional to the mass of the object

2Thank You

ANSWER

Name the enzymes present in tear which prevents eye infection

Posted by Spoorti Buddinni 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Nikhil Kumar 3 years, 6 months ago

Lysozyme

0Thank You

Archana Rawat 3 years, 6 months ago

Lysozyme

2Thank You

Shakti Kumar 3 years, 6 months ago

Losozymes

2Thank You

ANSWER

Send me the pic of pap3r

Posted by Gurpratap Singh Gill Chilli 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Manmohan Katiyar 3 years, 6 months ago

Ask your friends who have it or ur teachers For teachers first make the subject teacher your friend by chatting or whatever you want and then ask him to give you the question paper.

0Thank You

ANSWER

During an experiment a single form a spaceship reach the ground station in five minutes what was the distance of the spaceship from the ground station the signal Travels at the speed of light that is 3 into 10 to the power 8 metre per second

Posted by Priyanshi Chauhan 3 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Baby Bushra Siddiqe 3 years, 6 months ago

t=5min (5×60)sec =300sec, speed=3×10^8m/s distance =? Distance=speed × time Distance= 3×10^8×300 3×10^8×3×10^2 9×10^8+2 9×10^10m

0Thank You

Charugoyal 10A 3 years, 6 months ago

Time =5 min (convert it into sec)=5×60=300 sec. Then speed = d/t then d = s × t....therefore 3×10^8m/s× 300 sec= 9× 10^8 m ans

0Thank You

Priya Kumari 3 years, 6 months ago

Time- 5min [ 5×60=300sec] Speed- 3×10⁸m/s We have to find tha distance of spaceship from the ground that will be the Distance. Speed=Distance/time Distance=speed×time = 3×10⁸ ×300 =9×10¹⁰ m.

1Thank You

Krish Achra? 3 years, 6 months ago

Sorry by mistake I have written Dr

0Thank You

Krish Achra? 3 years, 6 months ago

0Thank You

ANSWER

Define concentration of a solution.

Posted by Rounak Meda 3 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Yaman Pahal 3 years, 6 months ago

Contertration of solution = mass of solute/mass of solution ×100

0Thank You

Priya Kumari 3 years, 6 months ago

Concentration of solution is the measure of solute present in the solution.

0Thank You

ANSWER

How do substance like Co2 and water in and out of cell ?

Posted by Ashutosh 3 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Spoorti Buddinni 3 years, 6 months ago

By process of diffusion and osmosis respectively

0Thank You

Priya Kumari 3 years, 6 months ago

Osmosis , Diffusion

0Thank You

Kabya Jha 3 years, 6 months ago

By process of osmosis water molecules move in and out of the cell

2Thank You

ANSWER

Why virus is don't show characteristics of life untill they enter in living body

Posted by Anurag Kansal 3 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Aditya Kandpal 3 years, 6 months ago

Because viruses are non cellular organisms they do not contain any cell hence do not show characteristics of life until they enter a living body and use it's machinery to reproduce

0Thank You

ANSWER

Carbon atom sabhi element me kyu hota hai?

Posted by Sumit Kushwaha 3 years, 6 months ago

CBSE > Class 09 > Science