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- Question
In an atomic nucleus, neutrons and protons are held together by
Options- A. gravitational forces
- B. exchange forces
- C. coulombic forces
- D. magnetic forces
- Correct Answer
- exchange forces
- 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
- 2. According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .
Options- A. a molecule
- B. a cation
- C. an anion
- D. an atom Discuss
- 3. Which of the following shows the masses of the three elementary particles in decreasing order?
Options- A. Leptons, Baryons, Mesons
- B. Mesons, Baryons, Leptons
- C. Baryons, Mesons, Leptons
- D. Leptons, Mesons Baryons Discuss
- 4. 'No two electrons in an atom can have the same set of four quantum numbers' is
Options- A. Newton's law
- B. Bohr's law
- C. Aufbau principle
- D. Pauli's exclusion principle Discuss
- 5. The wavelength of X-rays is of the order of
Options- A. 10 micron
- B. 1 angstrom
- C. 1 cm
- D. 1 m Discuss
- 6. The isotope of uranium capable of sustaining chain reaction is
Options- A. U-235
- B. U-245
- C. U-239
- D. U-238 Discuss
- 7. 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
- 8. Atoms are composed of
Options- A. electrons and protons
- B. electrons only
- C. protons only
- D. electrons and nuclei Discuss
- 9. 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
- 10. 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
General Science problems
Search Results
Correct Answer: 3900 - 7600 angstrom
Correct Answer: a molecule
Correct Answer: Baryons, Mesons, Leptons
Correct Answer: Pauli's exclusion principle
Correct Answer: 1 angstrom
Explanation:
1 angstrom = 1.0 x 10
-10 meters
Correct Answer: U-235
Correct Answer: absorption of corresponding wavelengths by the outer layers of the sun
Correct Answer: electrons and nuclei
Correct Answer: Rutherford
Correct Answer: Alpha particles
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