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- Question
Which one of the following is not a semiconductor?
Options- A. Silicon
- B. Germanium
- C. Quartz
- D. Gallium arsenide
- Correct Answer
- Quartz
ExplanationSemiconductors are the basic materials used in the present solid state electronic devices like diode, transistor, ICs, etc. 2. Lattice structure and the atomic structure of constituent elements decide whether a particular material will be insulator, metal or semiconductor. Semiconductors are elemental (Si, Ge) as well as compound (GaAs, CdS, etc.). Silicon, Germanium, Gallium Arsenide are semiconductors, but Quartz is an insulator.
- 1. What is nature of pH of Milk?
Options- A. Slightly Acidic
- B. Slightly Basic
- C. Highly Acidic
- D. Highly Basic Discuss
- 2. Nylon threads are made of
Options- A. Polyester polymer
- B. Polyamide polymer
- C. Polyvinyl polymer
- D. Polysaccharide Discuss
- 3. Which of the following gas was released during Bhopal gas tragedy?
Options- A. Methyl isocyanate
- B. Sodium isothiocyanate
- C. Nitrogen isothiocyanate
- D. Potassium isothiocyanate Discuss
- 4. Which of the following is an ore of Aluminium?
Options- A. Galena
- B. Cryollite
- C. Cinnabar
- D. Epsom Salt Discuss
- 5. What is an endothermic reaction?
Options- A. Reaction in which heat is released.
- B. Reaction in which heat is absorbed.
- C. Reaction in which neither heat is released nor absorbed.
- D. None of these Discuss
- 6. The pH value of a sample of multiple-distilled water is
Options- A. zero
- B. 14
- C. very near to zero
- D. very near to seven Discuss
- 7. Which one of the following is the most characteristic property of an element?
Options- A. Density
- B. Boiling point
- C. Mass number
- D. Atomic number Discuss
- 8. ?Plum Pudding Model? for an atom was proposed by
Options- A. Antoine Lavoisier
- B. Robert Boyle
- C. Ernest Rutherford
- D. J. J. Thomson Discuss
- 9. The chemical properties of an element depend upon
Options- A. the number of isotopes of the element
- B. the mass number of the element
- C. the total number of neutrons in the element
- D. the number of electrons in the outermost shell of the element Discuss
- 10. Which one of the following statements is not correct?
Options- A. The cathode rays originate from cathode and proceed towards the anode in a cathode-ray discharge tube.
- B. The television picture tubes are nothing but cathode ray tubes.
- C. The cathode rays themselves are not visible.
- D. The characteristics of cathode rays depend upon the nature of the gas present in the cathode-ray tube. Discuss
Chemistry problems
Search Results
Correct Answer: Slightly Acidic
Correct Answer: Polyamide polymer
Correct Answer: Methyl isocyanate
Correct Answer: Cryollite
Correct Answer: Reaction in which heat is absorbed.
Correct Answer: very near to seven
Explanation:
Water is neutral and has a pH value of 7 and because here it is multiple distilled water, it would be very near to seven
Correct Answer: Atomic number
Explanation:
Atomic number is the fundamental properties of an element. Every atom is identified by its unique atomic number. Atomic number is equal to the number of protons present in an atom of the element.
Correct Answer: J. J. Thomson
Explanation:
The first model of atom was proposed by J. J. Thomson in 1898.According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons are embedded in it like seeds in a watermelon. This model was picturesquely called plum pudding model of the atom
Correct Answer: the number of electrons in the outermost shell of the element
Explanation:
Chemical properties of an element depend on the number and the configuration of their (valence) electrons.
Correct Answer: The characteristics of cathode rays depend upon the nature of the gas present in the cathode-ray tube.
Explanation:
Cathode ray is a beam of electrons emitted from the cathode of a vacuum tube. It is invisible. Cathode ray tubes are also found in televisions and computer monitors. Since cathode ray is a beam of electrons and all electrons are identical, charge to mass ratio is same for all the gases and does not depend on the nature of gas.
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