Question

[ Multiple Choice Questions ]

1.) Electrons, protons and neutrons are also known as
a) primary particles
b) alpha particles
c) fundamental particles
d) all the above

2.) According to Dalton, the smallest particleof matter is a/an
a) molecule
b) compound
c) atom
d) substance

3.) Cathode days consists of
a) protons
b) electrons
c) alpha particles
d) neutrons

4.) A proton is identical to
a) the nucleus of helium
b) the nucleus of a hydrogen atom
c) a molecule of hydrogen
d) an atom of a hydrogen

5.) The value of e/m. of an atom is measured by
a) Millikan
b) JJ. Thomson
c) Dalton
d) Rutherford

6.) Which of the following pairs are isotopes?
a) Oxygen and Ozone
b) Ice and steam
c) Nitric oxide and nitrogen dioxide

7.) For an element with atomic number 19, the 19th electrons will occupy
a) L-shell
b) M-shell
c) N-shell
d) K-shell

8.) The number of electrons in an element with atomic number X and atomic mass Y will be
a) X - Y
b) Y - X
c) X + Y
d) X

9.) A natural phenomena that supports the experimental conclusion that atoms are divisible is
a) allotropy
b) radioactivity
c) cracking
d) none of these

10.) The charge of electron is
a) 1.6 x 10¹⁹ C
b) 1.6 x 10¹⁸ C
c) 1.6 x 10–¹⁸ C
d) 1.6 x 10–¹⁹ C

11.) The mass of electron is
a) 9.1 x 10-³¹g
b) 9.1 x 10-²⁸g
c) 9.1 x 10-³¹kg
d) 9.1 x 10-³⁰kg

12.) Who is associated with the famous oil-drop experiment?
a) Robert Millikan
b) JJ Thomson
c) Robert Boyle
d) none of these

13.) How many electrons are contained in one coulomb?
a) 1.60 x 10¹⁹
b) 6.25 x 10¹⁵
c) 6.25 x 10¹⁸
d) 1.60 x 10¹⁸

14.) Who discovered positive rays in the cathode ray tube itself?
a) Millikan
b) Goldstein
c) Chadwick
d) Thomson

15.) Who is associated with famous scattering experiment?
a) Rutherford
b) Thomson
c) Chadwick
d) Goldstein

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Answer 1

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1.) Electrons, protons and neutrons are also known as

a) primary particles

b) alpha particles

c) fundamental particles

d) all the above

Electrons , protons and neutrons are also known as Fundamental particles. Hence , Option(c) is the required answer.

2) According to Dalton, the smallest particle of matter is a/an

a) molecule

b) compound

c) atom

d) substance

John Dalton assumed that an atom is indivisible and smallest particle of matter. But later the modern theories proved him wrong , atom is divisible particle (which can be broke down into electrons , protons and neutrons). Hence , Option(c) is the required answer.

3.) Cathode days consists of

a) protons

b) electrons

c) alpha particles

d) neutrons

Cathode rays consists of electrons.Hence , Option(b) is the required answer.

4.) A proton is identical to

a) the nucleus of helium

b) the nucleus of a hydrogen atom

c) a molecule of hydrogen

d) an atom of a hydrogen

A proton is identical to the nucleus of helium. Hence , Option(a) is the required answer.

5.) The value of e/m. of an atom is measured by

a) Millikan

b) JJ. Thomson

c) Dalton

d) Rutherford

JJ Thomson's experiment. Hence , Option(b) is the required answer.

6.) Which of the following pairs are isotopes?

a) Oxygen and Ozone

b) Ice and steam

c) Nitric oxide and nitrogen dioxide

d) Hydrogen and deuterium

Isotopes are the one's with same atomic numbed but different mass number. Among, the given options hydrogen and deuterium bear the same atomic number. Hence , Option(d) is the required answer.

7.) For an element with atomic number 19, the 19th electrons will occupy

a) L-shell

b) M-shell

c) N-shell

d) K-shell

Total number of electrons is 19. K shell accomodates 2 electrons(it's maximum capacity) , L-shell accomodates 8 electrons (it's maximum capacity) and the M-shell can accomodate 18 electrons but out of 19 electrons 10 electrons are already situated in K and L shells so , the remaining 9electrons will go to M-shell. Hence , Option(b) is the required answer.

8.) The number of electrons in an element with atomic number X and atomic mass Y will be

a) X - Y

b) Y - X

c) X + Y

d) X

Number of electrons in an neutral atom is equal to the atomic number. Hence , Option(d) is the required answer.

9.) A natural phenomena that supports the experimental conclusion that atoms are divisible is

a) allotropy

b) radioactivity

c) cracking

d) none of these

Radioacitivity. Hence , Option(b) is the required answer.

10.) The charge of electron is

a) 1.6 x 10¹⁹ C

b) 1.6 x 10¹⁸ C

c) 1.6 x 10–¹⁸ C

d) 1.6 x 10–¹⁹ C

Charge of electron is 1.6 × 10⁻¹⁹ Coloumbs. Hence , Option(d) is the required answer.

11.) The mass of electron is

a) 9.1 x 10-³¹g

b) 9.1 x 10-²⁸g

c) 9.1 x 10-³¹kg

d) 9.1 x 10-³⁰kg

Mass of electron is 9.1 × 10⁻³¹ kg. Hence , Option(c) is the required answer.

12.) Who is associated with the famous oil-drop experiment?

a) Robert Millikan

b) JJ Thomson

c) Robert Boyle

d) none of these

Robert Millikan. Hence , Option(a) is the required answer.

13.) How many electrons are contained in one coulomb?

a) 1.60 x 10¹⁹

b) 6.25 x 10¹⁵

c) 6.25 x 10¹⁸

d) 1.60 x 10¹⁸

Option(c) is the required answer.

14.) Who discovered positive rays in the cathode ray tube itself?

a) Millikan

b) Goldstein

c) Chadwick

d) Thomson

Goldstein discovered anode rays (protons). Hence , Option(b) is the required answer.

15.) Who is associated with famous scattering experiment?

a) Rutherford

b) Thomson

c) Chadwick

d) Goldstein

Rutherford. Option(a) is the required answer.

Answer 2

[ Multiple Choice Questions ]

1.) Electrons, protons and neutrons are also known as

a) primary particles

b) alpha particles

☑ c) fundamental particles

d) all the above

2.) According to Dalton, the smallest particleof matter is a/an

a) molecule

b) compound

☑ c) atom

d) substance

3.) Cathode days consists of

a) protons

☑ b) electrons

c) alpha particles

d) neutrons

4.) A proton is identical to

a) the nucleus of helium

b) the nucleus of a hydrogen atom

c) a molecule ofhydrogen

☑ d) an atom of a hydrogen

5.) The value of e/m. of an atom is measured by

☑ a) Millikan

b) JJ. Thomson

c) Dalton

d) Rutherford

6.) Which of the following pairs are isotopes?

a) Oxygen and Ozone

b) Ice and steam

c) Nitric oxide and nitrogen dioxide

☑ d) Hydrogen and deuterium

7.) For an element with atomic number 19, the 19th electrons will occupy

a) L-shell

☑ b) M-shell

c) N-shell

d) K-shell

8.) The number of electrons in an element with atomic number X and atomic mass Y will be

a) X - Y

b) Y - X

c) X + Y

☑ d) X

9.) A natural phenomena that supports the experimental conclusion that atoms are divisible is

☑ a) allotropy

b) radioactivity

c) cracking

d) none of these.

10.) The charge of electron is

a) 1.6 x 10¹⁹ C

b) 1.6 x 10¹⁸ C

c) 1.6 x 10–¹⁸ C

☑ d) 1.6 x 10–¹⁹ C

11.) The mass of electron is

a) 9.1 x 10-³¹g

b) 9.1 x 10-²⁸g

☑ c) 9.1 x 10-³¹kg

d) 9.1 x 10-³⁰kg

12.) Who is associated with the famous oil-drop experiment?

☑ a) Robert Millikan

b) JJ Thomson

c) Robert Boyle

d) none of these

13.) How many electrons are contained in one coulomb?

a) 1.60 x 10¹⁹

b) 6.25 x 10¹⁵

☑ c) 6.25 x 10¹⁸

d) 1.60 x 10¹⁸

14.) Who discovered positive rays in the cathode ray tube itself?

a) Millikan

☑ b) Goldstein

c) Chadwick

d) Thomson

15.) Who is associated with famous scattering experiment?

☑ a) Rutherford

b) Thomson

c) Chadwick

d) Goldstein

$\huge{\underline{\tt{\orange{ Additional\:Information -}}}}$

Proton - It is a subatomic particles having mass equal to that of a hydrogen atom and it always carry positive charge in the formation of atom.

Electron - It is a subatomic particles having mass equal to 1/1840 of the hydrogen atom and it always carry negative electric change in the formation of atom.

CaptainBrainly

Electrons revolve outside the nucleus.

Neutron - It is a subatomic particles having mass equal to that of a hydrogen atom and it does not changes any electrical charge. It is discovered by Chadwick in 1932.

Canal rays - The positive rays which is invented by E. Goldstein named as canal rays