1

IIT-JEE 1998

MCQ (More than One Correct Answer)
The energy of an electron in the first Bohr orbit of H atom is -13.6 eV. The possible energy value(s) of the excited state(s) for electrons in Bohr orbits of hydrogen is (are)
A
-3.4 eV
B
-4.2 eV
C
-6.8 eV
D
-1.5 eV
2

IIT-JEE 1986

MCQ (More than One Correct Answer)
The sum of the number of neutrons and proton in the isotope of hydrogen is
A
6
B
2
C
4
D
3
3

IIT-JEE 1984

MCQ (More than One Correct Answer)
When alpha particles are sent through a thin metal foil, most of them go straight through the foil because
A
alpha particles are much heavier than electrons
B
alpha particles are positively charged
C
most part of the atom is empty space
D
alpha particle move with high velocity
4

IIT-JEE 1984

MCQ (More than One Correct Answer)
Many elements have non-integral atomic masses because:
A
they have isotopes
B
their isotopes have non-integral masses
C
their isotopes have different masses
D
the constitutents, neutrons, protons and electrons combine to give fractional masses

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