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

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

Ask Question

Ex 10.1 ki calculation

Posted by Chenika Goel 2 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Atomic masa.kaysay.nekaltay hai puzzle

Posted by Sirhan Chran Charan 2 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Itz_Khushi ❣️ 2 years, 7 months ago

By adding together the no. of protons and neutrons and multiplying bu 1 amu...... bcz each proton and each neutron weigh one atomic mass unit (amu) ......

0Thank You

ANSWER

What is galileo's law ?

Posted by Itz_Khushi ❣️ 2 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Sanket .........✨ 2 years, 7 months ago

Aur kya kr rhi ho...

0Thank You

Sanket .........✨ 2 years, 7 months ago

Exam kaisa gya ?

0Thank You

Sanket .........✨ 2 years, 7 months ago

Galileo's law of free fall states that, in the absence of air resistance, all bodies fall with the same acceleration, independent of their mass.

0Thank You

ANSWER

Write short notes on vaccination and immunisation

Posted by Yatharth Yadav 2 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Preeti Goswami 2 years, 7 months ago

Immunization is the process by which an individual immune system becomes strong against an disease

0Thank You

Gursahib Singh 2 years, 7 months ago

Immunization is the process by which an individual's immune system becomes fortified against an infectious agent. Vaccination is The act of introducing a vaccine into the body to produce protection from a specific disease.

2Thank You

ANSWER

What is ohm's law

Posted by Itz_Khushi ❣️ 2 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Lokesh Bawal 2 years, 7 months ago

According to Ohm's law, Current through conductor in the circuit is directly proportional to the voltage across ends of conductor.

0Thank You

Sanket .........✨ 2 years, 7 months ago

Ohm's law, description of the relationship between current, voltage, and resistance. The amount of steady current through a large number of materials is directly proportional to the potential difference, or voltage, across the materials. ... Ohm's law may be expressed mathematically as V/I = R.

0Thank You

ANSWER

Drawback of bohr model

Posted by Itz_Khushi ❣️ 2 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Hansika Aggarwal 2 years, 7 months ago

No draw backs

0Thank You

Tanveer Kaur 2 years, 7 months ago

There is no draw backs

0Thank You

Sanket .........✨ 2 years, 7 months ago

It cannot explain the spectrum of atoms other than hydrogen, for example, helium atom, which possesses only two electrons. Also, it unable to explain the splitting of spectral lines in the presence of a magnetic field (Zeeman effect) or an electric field (Stark effect).

0Thank You

ANSWER

Difference between molecular mass and molar mass

Posted by Itz_Khushi ❣️ 2 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Sanket .........✨ 2 years, 7 months ago

The main difference between molar mass and molecular mass is that the mass of a mole of a substance is measured in molar mass, whereas the mass of a molecule of the substance is measured in molecular mass. Molar mass is the total mass of 6.022 x 1023 molecules (Avogadro number) of a substance.

0Thank You

ANSWER

Rutherford's thoerey

Posted by Itz_Khushi ❣️ 2 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Sanket .........✨ 2 years, 7 months ago

Eske aage book mein h pura detail mein !

0Thank You

Sanket .........✨ 2 years, 7 months ago

Ernest Rutherford found that the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus. The nucleus is positively charged and surrounded at a great distance by the negatively charged electrons.

0Thank You

ANSWER

What is Kepler's second law

Posted by Itz_Khushi ❣️ 2 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Sanket .........✨ 2 years, 7 months ago

Esse to ho gya kaam ?

0Thank You

Sanket .........✨ 2 years, 7 months ago

Report kon kr rha h ??? I'd suspend ho gyi to ??

0Thank You

Sanket .........✨ 2 years, 7 months ago

Kepler's second law states that a planet moves in its ellipse so that the line between it and the Sun placed at a focus sweeps out equal areas in equal times.

0Thank You

ANSWER

Capter 12 ke intex qutions

Posted by Anisha Gehlot 2 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

How to calculate density

Posted by Rajdeep Gupta 22 2 years, 7 months ago

CBSE > Class 09 > Science

5 answers

Sarthak Kumar Prajapati 2 years, 7 months ago

Density = Mass/Volume

0Thank You

Mehak Bhagat Singh 2 years, 7 months ago

Density = mass/ volume Density unit kg/m3

1Thank You

Jasgun Kaur Garcha 2 years, 7 months ago

Density = mass / volume And unit of density is kg/m3

0Thank You

Anil Kumar 2 years, 7 months ago

Mass ÷ volume, units =gram/cm³ or kg/m³

0Thank You

Rajdeep Gupta 22 2 years, 7 months ago

Mass / volume

1Thank You

ANSWER

difference between health and diseases

Posted by Asha Nayak 2 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Sanket .........✨ 2 years, 7 months ago

Health is defined as an individual's mental, physical, and psychological well-being. The disease is defined as the abnormal dysfunctioning of the mental-physical states, which results in illness in a specific individual and does not take into account society or community.

0Thank You

ANSWER

Pascal law !

Posted by Sanket .........✨ 2 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Sanket .........✨ 2 years, 7 months ago

Shi h bestie bolti ho aur fir " Piyush tum hme bhul gye ho " reply krti ho ??

0Thank You

Sanket .........✨ 2 years, 7 months ago

11th ka h ye ?

0Thank You

Itz_Khushi ❣️ 2 years, 7 months ago

Pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container .. ( P=F/A)

0Thank You

ANSWER

Write four ways through which HIV is transmitted

Posted by Swati Talware 2 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Rishabh Sharma 2 years, 7 months ago

By syringe by breast milk by placenta by ***

0Thank You

Preeti Goswami 2 years, 7 months ago

Sharing food Sexual contact Using same injection Breast milk

0Thank You

ANSWER

What do u mean by acceleration due to gravity ?

Posted by Itz_Khushi ❣️ 2 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Itz_Khushi ❣️ 2 years, 7 months ago

Thanks

0Thank You

Sanket .........✨ 2 years, 7 months ago

Sorry 9.8m/s^2

0Thank You

Sanket .........✨ 2 years, 7 months ago

The acceleration of a body in free fall under the influence of earth's gravity expressed as the rate of increase of velocity per unit of time . ( 9.8m/s )

0Thank You

ANSWER

Diffrence between molecules mass and molar mass ?

Posted by Itz_Khushi ❣️ 2 years, 7 months ago

CBSE > Class 09 > Science

2 answers

Itz_Khushi ❣️ 2 years, 7 months ago

?by

0Thank You

Itz_Khushi ❣️ 2 years, 7 months ago

Molecular mass

1Thank You

ANSWER

What is congenital disease?

Posted by Amrita Rani Sahu 2 years, 7 months ago

CBSE > Class 09 > Science

2 answers

K K 2 years, 7 months ago

Congenital diseases are those diseases which are present in the child from birth. Common examples include Cystic fibrosis, Down syndrome, Haemophilia, etc.

1Thank You

Master Jd 2 years, 7 months ago

A disease that occurs at or before birth.

1Thank You

ANSWER

calculate the relative malecular mass of water (1₂0).

Posted by Shravani Jadhav 2 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Difference between the Active immunisation and passive immunisation?

Posted by Pranaya Mahajan 2 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Q.12(i):- During photosynthesis glouse (Cc H12 O6) and oxygen is formed calculate the molecules mass of glucose.(c=12u, H=1u.O=16u). (ii) How many atoms are present in 12g of C-12?

Posted by Izma Ansari 2 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Q.11(i):- Write the chemical formula of Aluminium hydroxide and sodium chloride. (ii):-Name the folllowing compound.(i)Al2 O3 (ii) Mgo.

Posted by Izma Ansari 2 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Q.10:- State universal law of gravitation.Also write two of its importance.What does 'G' & 'g' stands for with respect to gravitation?

Posted by Izma Ansari 2 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Rishabh Sharma 2 years, 7 months ago

any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. g=The acceleration experienced by a body under free fall due to the gravitational force of the massive body.......<>×<>.......G=The force of attraction between two objects with unit mass separated by a unit distance at any part of this universe.

0Thank You

ANSWER

Write ppstulats of Bohar modal of an atom

Posted by Abhishek Kumar 2 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Prachi Pal 2 years, 7 months ago

In an atom, electrons (negatively charged) revolve around the positively charged nucleus in a definite circular path called orbits or shells. Each orbit or shell has fixed energy and these circular orbits are known as orbital shells. The energy levels are represented by an integer (n=1, 2, 3…) known as the quantum number. This range of quantum numbers starts from the nucleus to the side with n=1 having the lowest energy level. The orbits n=1, 2, 3, 4… are assigned as K, L, M, N…. Shells and when an electron attains the lowest energy level it is said to be in the ground state. The electrons in an atom move from a lower energy level to a higher energy level by gaining the required energy and an electron moves from a higher energy level to a lower energy level by losing energy.

0Thank You

ANSWER

What is called enargy

Posted by Dipu Kumar 2 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Aanchal Arora 2 years, 7 months ago

Energy is the ability to do work. It is a scalar quantity. 2 Types of energy 1.kinetic energy. 2.Potential energy.

1Thank You

Abhijit Nayak 2 years, 7 months ago

force is a push and pull is called force

0Thank You

Abhijit Nayak 2 years, 7 months ago

What is force

0Thank You

Trishna Mohanty 2 years, 7 months ago

The ability to do work is called energy

2Thank You

ANSWER

Calculate number of molecules of 23 g of Na.

Posted by Âťťíťůđē Bøý 2 years, 7 months ago

CBSE > Class 09 > Science

3 answers

Âťťíťůđē Bøý 2 years, 7 months ago

Thank u

0Thank You

Chandana Gupta 2 years, 7 months ago

As we know n=w/m & n=N/N⁰(N⁰=Avogadro No.=6.022×10²³) So, w/m=N/N⁰ w=given weight=23g m=molecular mass(here, for Na)=23g N=no. of particles=? So, 23/23=N/6.022×10²³ 1=N/6.022×10²³ 6.022×10²³=N So, the answer is 6.022×10²³ molecules.

2Thank You

Âťťíťůđē Bøý 2 years, 7 months ago

Please answer do

6Thank You

ANSWER

Hi....kiske pass math ka 2nd term ka paper hai?. Jo exam me ane vala hai...kiski exam pehele ho gayi ho to...plz batavv

Posted by Xoxo .. 2 years, 7 months ago

CBSE > Class 09 > Science