science
Grade-9
Easy
Question
“Dalton’s theory of same element has same mass and properties” was proved wrong by the invention of
- Molecules
- Isotopes
- Isotones
- Isobars
Hint:
Dalton considered that an element would have the same atomic mass and similar chemical properties and this turned out to be a false statement.
The correct answer is: Isotopes
- “Dalton’s theory of the same element has same mass and properties” was proved wrong by the invention of the isotopes.
- Isotopes are the elements that have two or more forms that have the same atomic number but different atomic mass. Their number of protons are same but their number of neutrons differs.
- Dalton proposed that the element has the same properties and mass but it was later found that an element can have different atomic mass and thus, different chemical properties.
Atomic number is determined by the number of protons and atomic mass is determined by mass of nuclei.
Related Questions to study
science
Who proposed “Atoms are indivisible”.
The atoms are chemically neutral. The positive charge is balanced by the negative charge.
Who proposed “Atoms are indivisible”.
scienceGrade-9
The atoms are chemically neutral. The positive charge is balanced by the negative charge.
science
________ are explanations of observations that are supported by reliable evidence.
To become a theory, a hypothesis needs to be tested a good number of times.
________ are explanations of observations that are supported by reliable evidence.
scienceGrade-9
To become a theory, a hypothesis needs to be tested a good number of times.
science
All matter is made of small particles called
The positive charge in the atom is known as proton and the negative charge is known as the electron.
All matter is made of small particles called
scienceGrade-9
The positive charge in the atom is known as proton and the negative charge is known as the electron.
science
The velocity-time graph drawn by Mona turned out to be a straight line parallel to the x-axis. Which of the following is true about the body’s motion?
a. The body did not make any displacement
b. The body’s velocity was constant
c. The body made a non-zero displacement
d. The body is at rest
The velocity-time graph drawn by Mona turned out to be a straight line parallel to the x-axis. Which of the following is true about the body’s motion?
a. The body did not make any displacement
b. The body’s velocity was constant
c. The body made a non-zero displacement
d. The body is at rest
scienceGrade-9
science
The total displacement of the body is ____ m.
The total displacement of the body is ____ m.
scienceGrade-9
science
The displacement of section C is ____ m.
The displacement of section C is ____ m.
scienceGrade-9
science
The graph of the following data will be a _____.
The graph of the following data will be a _____.
scienceGrade-9
science
The acceleration of section C is ____ m/s2.
The acceleration of section C is ____ m/s2.
scienceGrade-9
science
A body starts from the rest and is in a uniformly accelerated motion. The coordinates of the endpoint of its graph are (x, y). Which of the following is the correct formula for the displacement of the body?
A body starts from the rest and is in a uniformly accelerated motion. The coordinates of the endpoint of its graph are (x, y). Which of the following is the correct formula for the displacement of the body?
scienceGrade-9
science
The following data table represents which kind of motion?
The following data table represents which kind of motion?
scienceGrade-9
science
The v-t graph of a moving body is a straight line with a non-zero slope. Which of the following cannot be true about the motion of the body?
The v-t graph of a moving body is a straight line with a non-zero slope. Which of the following cannot be true about the motion of the body?
scienceGrade-9
science
The slope of the v-t graph of a moving body is constant and negative everywhere. The body is most likely to be in ____.
The slope of the v-t graph of a moving body is constant and negative everywhere. The body is most likely to be in ____.
scienceGrade-9
science
The acceleration of section B is ____.
The acceleration of section B is ____.
scienceGrade-9
science
The v-t graph of a body is a straight line with a positive slope. Which of the following is true about the body’s motion?
a. It is in a uniform motion
b.Its velocity is constant
c. Its velocity increases by equal amounts in equal intervals of time.
d. Its velocity decreases by equal amounts in equal intervals of time.
The v-t graph of a body is a straight line with a positive slope. Which of the following is true about the body’s motion?
a. It is in a uniform motion
b.Its velocity is constant
c. Its velocity increases by equal amounts in equal intervals of time.
d. Its velocity decreases by equal amounts in equal intervals of time.
scienceGrade-9
science
The displacement of section B is ____ m.
The displacement of section B is ____ m.
scienceGrade-9
