Class-11,STRUCTURE OF ATOM

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Q1) According to Dalton’s atomic theory *

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Atoms are made of electrons and protons

Atoms are made of neutrons and protons

Atoms are indivisible

Atoms are made of electrons, neutrons and protons

Q2) Cathode rays or cathode ray particles are *

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neutrons

protons

muons

electrons

Q3) The total energy of an electron in the first excited state of the hydrogen atom is about −3.4 eV. What is the kinetic energy of the electron in this state? *

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-3.4 eV

+1.7 eV

+6.8 eV

+3.4 eV

Q4) Charge on the electron was determined by *

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cathode ray discharge tube experiments

R.A. Millikan's oil drop experiment

Electrical discharge carried out in the modified cathode ray tube

x-ray tube experiments

Q5) in the Thomson Model of Atom *

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electrons move in circular orbits around nucleus

electrons oscillate about the nucleus

electrons are embedded in a positively charged pudding or water melon

electrons swarm like flies around nucleus

Q6) Rutherford’s α–particle scattering experiment supported the discovery of *

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electron

nucleus

radioactivity

proton

Q7) Correct expression for mass number A is *

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A = number of protons (Z)+ number of electrons(n)

A = number of electrons (Z)+ number of positrons (n)

A = number of nucleons (Z) + number of neutrons (n)

A = number of protons (Z)+ number of neutrons (n)

Q8) Isobars are the atoms with *

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same number of neutrons but different mass number

same atomic number but different number of neutrons

same atomic number but different mass number

same mass number but different atomic number

Q9) Isotopes are the atoms with *

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same atomic number but different number of electrons

same atomic number but different mass number

same mass number but different atomic number

same number of neutrons but different mass number

Q10) Photoelectric effect established that light *

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behaves like rays

behaves like magnetic fields

behaves like waves

behaves like particles

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