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Question:- Atoms are composed of A. electrons and protons B. electrons only C. protons only D. electrons and nuclei
Answer:- Option D
Question:- In an atomic explosion, enormous energy is released which is due to A. conversion of chemical energy into heat energy B. conversion of mechanical energy into nuclear energy C. conversion of mass into energy D. conversion of neutrons into protons
Answer:- Option C
Question:- Isotopes are separated by A. crystallisation B. sublimation C. distillation D. filtration
Answer:- Option C
Question:- The wavelength of X-rays is of the order of A. 10 micron B. 1 angstrom C. 1 cm D. 1 m
Answer:- Option B
Question:- Mesons are found in A. Laser beam B. X-rays C. Gamma rays D. Cosmic rays
Answer:- Option D
Question:- Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material? A. Thorium B. Radium C. Plutonium D. Radan
Answer:- Option A
Question:- 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
Answer:- Option C
Question:- What is the wavelength of visible spectrum? A. 8500 - 9800 angstrom B. 7800 - 8000 angstrom C. 3900 - 7600 angstrom D. 1300 - 3000 angstrom
Answer:- Option C
Question:- Which of the following has a least penetrating power? A. All have same penetrating power B. Beta Particles C. Alpha particles D. Gamma rays
Answer:- Option C
Question:- The isotope of uranium capable of sustaining chain reaction is A. U-235 B. U-245 C. U-239 D. U-238
Answer:- Option A
Question:- The age of most ancient geological formations is estimated by A. Ra - Si method B. Potassium - argon method C. C14 method D. Uranium - lead method
Answer:- Option D
Question:- Who suggested that most of the mass of the atom is located in the nucleus? A. Thompson B. Bohr C. Rutherford D. Einstein
Answer:- Option C
Question:- 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
Answer:- Option A
Question:- In an atomic nucleus, neutrons and protons are held together by A. gravitational forces B. exchange forces C. coulombic forces D. magnetic forces
Answer:- Option B