Students can read the important questions given below for Atoms Class 12 Physics. All Atoms Class 12 Notes and questions with solutions have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS. You should read all notes provided by us and Class 12 Physics Important Questions provided for all chapters to get better marks in examinations. Physics Question Bank Class 12 is available on our website for free download in PDF.
Important Questions of Atoms Class 12
Question. What is the basic unit of matter?
a) Atom
b) Electron
c) Proton
d) Neutron
Answer
A
Question. The series of spectrum when electron jumps from n = 5 to n = 3 is
a) Lymen
b) Balmer
c) Paschen
d) Bracket
Answer
C
Question. Balmer series is obtained when electron transits from
a) n = 1,2,3, … to n = 5
b) n = 3,4,5 … to n = 2
c) n = 1,2,3, … to n = 4
d) n = 1,2,3, … to n = 6
Answer
B
Question. From Fig. shown predict which series has waves of maximum frequency
a) Lymen
b) Balmer
c) Paschen
d) Bracket
Answer
A
Question. What is the maximum energy of photon in emission spectrum of hydrogen atom
a) 13.6 eV
b) 1.36 eV
c) 1.5 eV
d) 1eV
Answer
A
Question. Which particle is responsible for the ionization of the atom?
a) Positron
b) Electron
c) Proton
d) Neutron
Answer
B
Question. If number of protons in an atom is equal to (number of electrons + 2). Then the atom is said to be
a) Single ionized positive ion
b) Single ionized positive atom
c) Double ionized positive ion
d) Double ionized positive atom
Answer
C
Question. Which is the most dense part of an atom?
a) The exact central part of the atom.
b) The region at the center of atom containing neutrons and protons.
c) Outer edge of the atom
d) None of the above
Answer
B
Question. Why electrons around the gold nucleus were unable to deflect α particles?
a) Size of α particle is much greater than that of electron.
b) Number of electrons around gold nucleus is very small
c) α particles is much heavier than electron.
d) Electrons are negatively charged.
Answer
C
Question. What is the ratio of charge on α particle and gold nucleus?
a) .025
b) .25
c) .2
d) .5
Answer
A
Question. What percentage of α particle scattered at an angle more than 90º?
a) .0125%
b) .125%
c) 1.25%
d) 12.5%
Answer
A
Question. Why the nucleus of gold is about remains stationary throughout the scattering process?
a) Because its mass is 100 times the mass of proton.
b) Because its mass is 50 times the mass of proton.
c) Because its mass is 150 times the mass of proton.
d) Because its mass is 200 times the mass of proton.
Answer
D
