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- Question
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
- Correct Answer
- a molecule
- 1. 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
- 2. '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
- 3. The wavelength of X-rays is of the order of
Options- A. 10 micron
- B. 1 angstrom
- C. 1 cm
- D. 1 m Discuss
- 4. Which among the following is a positively charged particle emitted by a radioactive element?
Options- A. Beta ray
- B. Alpha ray
- C. Cathode ray
- D. Gamma ray Discuss
- 5. Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
Options- A. Thorium
- B. Radium
- C. Plutonium
- D. Radan Discuss
- 6. 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
- 7. 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
- 8. The isotope of uranium capable of sustaining chain reaction is
Options- A. U-235
- B. U-245
- C. U-239
- D. U-238 Discuss
- 9. 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
- 10. Atoms are composed of
Options- A. electrons and protons
- B. electrons only
- C. protons only
- D. electrons and nuclei Discuss
General Science problems
Search Results
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: Alpha ray
Correct Answer: Thorium
Correct Answer: 3900 - 7600 angstrom
Correct Answer: exchange forces
Correct Answer: U-235
Correct Answer: absorption of corresponding wavelengths by the outer layers of the sun
Correct Answer: electrons and nuclei
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