1000 Best General Science MCQ-Questions
Q89). Which of the following shows the masses of the three elementary particles in decreasing order?
a).Leptons, Baryons, Mesons
b).Mesons, Baryons, Leptons
c).Baryons, Mesons, Leptons
d).Leptons, Mesons Baryons
Correct Answer:
Baryons, Mesons, Leptons
Explanation:
Q90). What is the wavelength of visible spectrum?
a).8500 – 9800 angstrom
b).7800 – 8000 angstrom
c).3900 – 7600 angstrom
d).1300 – 3000 angstrom
Correct Answer:
3900 – 7600 angstrom
Explanation:
Q91). Which of the following has a least penetrating power?
a).All have same penetrating power
b).Beta Particles
c).Alpha particles
d).Gamma rays
Correct Answer:
Alpha particles
Explanation:
Q92). The isotope of uranium capable of sustaining chain reaction is
a).U-235
b).U-245
c).U-239
d).U-238
Correct Answer:
U-235
Explanation:
Q93). The age of most ancient geological formations is estimated by
a).Ra – Si method
b).Potassium – argon method
c).C method
d).Uranium – lead method
Correct Answer:
Uranium – lead method
Explanation:
Q94). Who suggested that most of the mass of the atom is located in the nucleus?
a).Thompson
b).Bohr
c).Rutherford
d).Einstein
Correct Answer:
Rutherford
Explanation:
Q95). The dark lines in the solar spectrum are due to
a).absorption of corresponding wavelengths by the outer layers of the sun
b).destructive interference between waves of certain definite wavelengths
c).absorption of corresponding wavelengths by the prism used in the photograph
d).absence of corresponding wavelengths from the light emitted by the core of the sun
Correct Answer:
absorption of corresponding wavelengths by the outer layers of the sun
Explanation:
Q96). In an atomic nucleus, neutrons and protons are held together by
a).gravitational forces
b).exchange forces
c).coulombic forces
d).magnetic forces
Correct Answer:
exchange forces
Explanation: