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

No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

Who discovered ? 1 electron 2proton 3 neutron and 4nucleus

Posted by Mohit Kumar 3 years, 8 months ago

CBSE > Class 09 > Science

3 answers

Mohit Kumar 3 years, 8 months ago

Nucleus -goldstein

Mohit Kumar 3 years, 8 months ago

Thanks

Abdul Bashit 3 years, 8 months ago

Electron-J.J. THOMPSON PROTON-GOLDSTEIN NEUTRON-CHADWICK AND I DONT KNOW NUCLEUS DISCOVERED

ANSWER

Difference between Atom and cell ?

Posted by Virat Jaat 3 years, 8 months ago

CBSE > Class 09 > Science

3 answers

Virat Jaat 3 years, 8 months ago

If Atom is the smallest unit of non living, then please tell me how the cell is made?

Mohit Kumar 3 years, 8 months ago

Right priyal and a cell is made up of atoms and a atom is very small in the comparison of a cell

Priyal Gupta 3 years, 8 months ago

Cell is the basic structural and functional unit of life. It is the smallest unit in living organisms. Cell is a living thing. Whereas an atom is the basic particle in nonliving organism. It is not a living thing

ANSWER

What do you understand by ground state of an atom?

Posted by Diya Jogi 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Khushi Kaur 3 years, 8 months ago

A ground-state atom is an atom in which the total energy of the electrons can not be lowered by transferring one or more electrons to different orbitals. That is, in a ground-state atom, all electrons are in the lowest possible energy levels. eg: Consider a carbon atom whose electron configuration is the following. The total energy of the electrons in this carbon atom can not be lowered by transfering one or more electrons to different orbitals. Therefore, this carbon atom is a ground-state atom.

ANSWER

Which subatomic particle is absent in an ordinary hydrogen atom?

Posted by Diya Jogi 3 years, 8 months ago

CBSE > Class 09 > Science

3 answers

The Space Physco 3 years, 8 months ago

Neutrons

Khushboo Kumari 3 years, 8 months ago

Neutrons

Khushi Kaur 3 years, 8 months ago

Neutron

ANSWER

An object was thrown at a certain angle to the ground movwe in curved path anlfals black to ground the initial and the final points of the path of the object lying on the same horizontal line. What in the walk alone by the force of gravity on the object.

Posted by Deekshith Gowda 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Khushi Kaur 3 years, 8 months ago

Work done by the force of gravity on an object depends solely on vertical displacement. Vertical displacement is given by the distinction within the initial and final positions/heights of the thing that is zero. We know that, W=mgh W = m g × zero = 0 J {h= Vertical displacement = zero} ∴ Work done is zero.

ANSWER

What is molecular formula?explain with example.

Posted by Insha Maqbool 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Khushi Kaur 3 years, 8 months ago

The molecular formula is the expression of the number of atoms of each element in one molecule of a compound. The molecular formula definition is the formula showing the actual number of each atom in a molecule. When the molar mass value is known, the Molecular Formula is calculated by the empirical formula. n=molar mass/mass of the empirical formula The molecular formula is often the same as an empirical formula or an exact multiple of it.

ANSWER

The weight of an object on the earth surface is 100N what should be his mass on earth and moon if the speed on earth is 9.8 m per second & on moon it is 1.63 m per second

Posted by Yash Tanwar 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Akash Mishra 3 years, 8 months ago

0

ANSWER

For writing thee formulas in atoms and molecules how to know where to write velancy and where to write charge???

Posted by Vaibhavi Narvenkar 16 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Palak Gupta 3 years, 8 months ago

The rule for writing chemical formula is as follow: Firstly, write the symbols with positive charge valency first. Secondly, write the valency of each atom on the top of its symbol. Thirdly, divide the valency number by their highest common factor ignore the positive or negative radicle. Hope it is helping you Please give me thanks

ANSWER

what do you mean by 20% concentrated salt solution in water? give 2 points

Posted by Sanjivani Gupta 3 years, 8 months ago

CBSE > Class 09 > Science

2 answers

धर्मेंद्र कुशवाह 3 years, 8 months ago

100 ml water+ 20 mg salt

Vanshita Chauhan 3 years, 8 months ago

1.NaCl + H2O → NaOH + HCl 2. We will get acid as well as base

ANSWER

3.Why is topsoil with bare vegetation easily removed? 1

Posted by Sanchita Chatterjee 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Yash Tanwar 3 years, 8 months ago

The soil not covered by vegetation (trees and other plants) is easily eroded because there are no roots of trees and plants in it which can bind the soil particles together and prevent them from being carried away by strong winds or flowing rainwater. ... Due to this, soil erosion does not occur.

ANSWER

on heating a mixture of iron filings and sulphur why are we not able to separate iron filings using a magnet

Posted by Sanjivani Gupta 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Aarya Sharma 3 years, 8 months ago

On heating a mixture of iron fillings and sulphur, we are not able to separate iron fillings using a magnet because iron fillings and sulphur have chemically combined with each other on heating therefore forming a compound. That is why we are not able to separate iron fillings using magnet.

ANSWER

A hammer of mass 500 g moving at 50 m s-1 strikes a nail The nail stop the hammer in a very short time 0.01s.what is the force of the nail on the Hammer

Posted by Sukrit Shokeen 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Khushi Kaur 3 years, 8 months ago

Mass of the hammer (m) = 500 g = 0.5 kg The initial velocity of the hammer (u) = 50 m/s Time is taken by the nail to the stop the hammer (t) = 0.01 s The velocity of the hammer (v) = 0 (since the hammer finally comes to rest) From Newton’s second law of motion f = m (v – u) / t Where f = force f = 0.5 × (0 – 50) / 0.01 f = -2500 N

ANSWER

Drawback of Rutherford's model

Posted by Shorya Rawat 3 years, 8 months ago

CBSE > Class 09 > Science

2 answers

Vanshita Chauhan 3 years, 8 months ago

As per Rutherford’s model, electrons revolve around the nucleus in a circular path. But particles that are in motion on a circular path would undergo acceleration, and acceleration causes radiation of energy by charged particles. Eventually, electrons should lose energy and fall into the nucleus. And this points to the instability of the atom. But this is not possible because atoms are stable. Hence, Rutherford failed to give an explanation on account of this.

Kuldeep Singh 3 years, 8 months ago

Rutherford Can't explain the stability of an atom

ANSWER

Electronic configuration of 20Ca40

Posted by Kartikey Gupta 3 years, 8 months ago

CBSE > Class 09 > Science

3 answers

Parul Ailawadi 3 years, 8 months ago

2,8,8,2

Abdul Bashit 3 years, 8 months ago

K=2,L=8,M=8,N=8

Kuldeep Singh 3 years, 8 months ago

k =2,L=8,M=8,N=8

ANSWER

How can we found salt

Posted by Jd Sharma 3 years, 8 months ago

CBSE > Class 09 > Science

2 answers

Himanshu Badole 3 years, 8 months ago

You just heat sea water... U will get it

Himanshu Badole 3 years, 8 months ago

Salt can be found in sea water..... Sea water is Rich in salt..

ANSWER

A motorcycle moving with a speed of 5m/ s is subjected to accelerate of 0.2 m/s² .calculate the speed of motorcycle after 10s and distance travelled in this time

Posted by Anushka Singh 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Khushi Kaur 3 years, 8 months ago

1) Given that The initial speed of car=u= 5 m/s Acceleration =a=0.2m/s2 Time=t=10s We need to calculate the distance We know that v = u + at = 5 + 0.2×10 = 5+2 = 7 m/s s = ut + 1/2at² = (5×10) + (1/2)×(2/10)×(10×10) = 50 + 10 = 60 m Final speed = 7 m/s Distance traveled in 10 seconds = 60 m

ANSWER

A train starting from rest attains a velocity of 72 km h-1 in 5 min assuming that the acceleration is uniform find

Posted by Vaishnavi Maske 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Mohit Kumar 3 years, 8 months ago

Find what?

ANSWER

Who is Ashish Kumar Tandi

Posted by Ashish Kumar Tandi 3 years, 8 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Define anode, cathode and canal rays.

Posted by Abhishek Singh 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Kuldeep Singh 3 years, 8 months ago

The positively charged rays are card anode rays and the negatively charged rays are called cathode rays

ANSWER

Define uniform motion and non uniform motion

Posted by Shanthosh Kanna 3 years, 8 months ago

CBSE > Class 09 > Science

3 answers

Rimjhim Goswami 3 years, 8 months ago

When an object travels called distance in equal interval of time is known as uniform motion and when it does not travel equal distance with respect to the time is known as non uniform motion

Lawanya Taak 3 years, 8 months ago

Uniform motion is a motion when an object travels equal distance in equal time interval. Uniform motion is a motion when an object travels unequal distance in equal time interval. Thank you.

Yamuna Sharma 3 years, 8 months ago

Uniform motion- When an object travels equal distance in equal interval of time, then it will know as uniform motion. Non-uniform motion- When an object travels unequal distance in equal interval of time, it will be non-uniform motion. Hope you will understand!!!!! @bts_armys_official7 ?✨

ANSWER

Write a short note on plastid ?

Posted by ☆ Pranal Rewatkar ☆ 3 years, 8 months ago

CBSE > Class 09 > Science

2 answers

Rimjhim Goswami 3 years, 8 months ago

Plastics are responsible for the storage of the food they are of three types chromoplast and leucoplast and chloroplast in which chloroplast is responsible for the green pigment due to which plant appear green and leucoplast are colour less and store carbohydrate and starch chromoplast means colour

Khushi Kaur 3 years, 8 months ago

Plastids are double-membrane organelles which are found in the cells of plants and algae. Plastids are responsible for manufacturing and storing of food. These often contain pigments that are used in photosynthesis and different types of pigments that can change the colour of the cell.

ANSWER

Zaid is moving in his car with a velocity of 45km/h. How much distance he covers in 1 minute and 1 sec

Posted by Zaid . 3 years, 8 months ago

CBSE > Class 09 > Science

2 answers

Kuldeep Singh 3 years, 8 months ago

We can solve this answer by the formula distance is equal to speed multiply by time

Ankush Ranjan 3 years, 8 months ago

In 1 sec = 12.5metre And in 1 min = 12.5 × 60 = 750 metre

ANSWER

What is the total momentum of a bullet and a gun after firring

Posted by Nishant Prajapati 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Ankush Ranjan 3 years, 8 months ago

Mv

ANSWER

Explain any five connective tissues with diagram.

Posted by Mr. Popular Creator 3 years, 8 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What are photosynthesis

Posted by Jay Darji 3 years, 8 months ago

CBSE > Class 09 > Science

4 answers

Anisha Meher 3 years, 8 months ago

A process in which plants make their own food by using sunlight,water,and air is called photosynthesis

Namit Gupta 3 years, 8 months ago

Process in which plants make their food in the present of chlorophyll

Bharti Meena 3 years, 8 months ago

This is a process by which plants make their own food.

Abhishek Kumar 3 years, 8 months ago

Plant make their own food with the help of photosynthesis

ANSWER

What is the combining capacity of an element called?

Posted by Janvi Gandhi 3 years, 8 months ago

CBSE > Class 09 > Science

4 answers

Anisha Meher 3 years, 8 months ago

Valency

Shivraj Meena 3 years, 8 months ago

Valency

Abhishek Kumar 3 years, 8 months ago

Valency

Yash Yadav 3 years, 8 months ago

Valency

ANSWER

Why the cell called the structural and functional unit of life ?

Posted by ☆ Pranal Rewatkar ☆ 3 years, 8 months ago

CBSE > Class 09 > Science

4 answers

Ankush Ranjan 3 years, 8 months ago

The cell is called the structural and functional unit of life as all living organisms are made up of cells. ... Furthermore, cells provide form and structure, process nutrients and convert it into useable energy. Multicellular organisms have specialized cells that perform specific functions.

Abhishek Kumar 3 years, 8 months ago

Because all cell perform specific structure and function that's why the cell called structure and function unit of life

Priyanshu Kalwaniya 3 years, 8 months ago

42

Vaishali Yadav 3 years, 8 months ago

The cell is called the structural and functional unit of life as all living organisms are made up of cells. ... Furthermore, cells provide form and structure, process nutrients and convert it into useable energy. Multicellular organisms have specialized cells that perform specific functions.

ANSWER

A girl of mass 40kg jumps with a horizontal velocity of 5m/s onto a stationary cart with frictionless wheels. The mass of cart is 3kg wha

Posted by Aanya Jain 3 years, 8 months ago

CBSE > Class 09 > Science

1 answers

Virat Jaat 3 years, 8 months ago

Given : Mgirl=40 kg ugirl=5 m/s Mcart=3 kg Initial velocity of cart ucart=0 Let the final velocity of cart be V. Applying conservation of linear momentum : Pi=Pf Or Mgirlugirl+Mcartucart=(Mgirl+Mcart)V Or 40×5+3×0=(40+3)V ⟹ V=43200 m/s

ANSWER

What is the soluble

Posted by Luckygupta Gupta 3 years, 8 months ago

CBSE > Class 09 > Science

2 answers

Anisha Meher 3 years, 8 months ago

Substances that dissolve in water are called soluble substances. When you mix sugar with water, the sugardissolves to make a transparent solution. Salt is soluble in water too.

Koyya Vamsi 3 years, 8 months ago

When the solid like sugar and salt like that we put in water they dissolve so, this is called soluble

ANSWER

Name the three sub atomic particles of an atom

Posted by Satyadeep Sharma Sharma 3 years, 8 months ago

CBSE > Class 09 > Science

5 answers

Abhishek Kumar 3 years, 8 months ago

N p e

Ankush Ranjan 3 years, 8 months ago

The three subatomic particles are 1.neutron 2.proton 3. Electron

Thakur Vishal Singh Rana 3 years, 8 months ago

Nice

Shanmukh Gunturi 3 years, 8 months ago

The three subatomic particles are 1.neutron 2.proton 3. Electron

Vidhi Agarwal 3 years, 8 months ago

Hi stayadeep.. The 3 subatomic particles of an atom are- Proton Neutron Electron

ANSWER

Page 127 of 1371

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Google Play

Download myCBSEguide App