General Science problems
- 1. What is the wavelength of visible spectrum?
Options- A. 8500 - 9800 angstrom
- B. 7800 - 8000 angstrom
- C. 3900 - 7600 angstrom
- D. 1300 - 3000 angstrom Discuss
Correct Answer: 3900 - 7600 angstrom
- 2. In an atomic nucleus, neutrons and protons are held together by
Options- A. gravitational forces
- B. exchange forces
- C. coulombic forces
- D. magnetic forces Discuss
Correct Answer: exchange forces
- 3. The isotope of uranium capable of sustaining chain reaction is
Options- A. U-235
- B. U-245
- C. U-239
- D. U-238 Discuss
Correct Answer: U-235
- 4. The dark lines in the solar spectrum are due to
Options- 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 Discuss
Correct Answer: absorption of corresponding wavelengths by the outer layers of the sun
- 5. Atoms are composed of
Options- A. electrons and protons
- B. electrons only
- C. protons only
- D. electrons and nuclei Discuss
Correct Answer: electrons and nuclei
- 6. Who suggested that most of the mass of the atom is located in the nucleus?
Options- A. Thompson
- B. Bohr
- C. Rutherford
- D. Einstein Discuss
Correct Answer: Rutherford
- 7. Which of the following has a least penetrating power?
Options- A. All have same penetrating power
- B. Beta Particles
- C. Alpha particles
- D. Gamma rays Discuss
Correct Answer: Alpha particles
- 8. The age of most ancient geological formations is estimated by
Options- A. Ra - Si method
- B. Potassium - argon method
- C. C14 method
- D. Uranium - lead method Discuss
Correct Answer: Uranium - lead method
- 9. In an atomic explosion, enormous energy is released which is due to
Options- 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 Discuss
Correct Answer: conversion of mass into energy
- 10. How many colours the sunlight spectrum has?
Options- A. Three
- B. Seven
- C. Four
- D. Five Discuss
Correct Answer: Seven
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