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- Question
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.
- Correct Answer
- The characteristics of cathode rays depend upon the nature of the gas present in the cathode-ray tube.
ExplanationCathode 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.
- 1. 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
- 2. ?Plum Pudding Model? for an atom was proposed by
Options- A. Antoine Lavoisier
- B. Robert Boyle
- C. Ernest Rutherford
- D. J. J. Thomson Discuss
- 3. 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
- 4. 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
- 5. Which one of the following is not a semiconductor?
Options- A. Silicon
- B. Germanium
- C. Quartz
- D. Gallium arsenide Discuss
- 6. The molecular mass of sulphuric acid is 98. If 49 g of the acid is dissolved in water to make one litre of solution, what will be the strength of the acid?
Options- A. Two normal
- B. One normal
- C. 0.5 normal
- D. Four normal Discuss
- 7. In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement". As feared, (differences into) the families pose a hurdle.
Options- A. difference into
- B. difference as in
- C. difference amongst
- D. No improvement Discuss
- 8. Chemical formula for sulphurous acid is:
Options- A. H2SO4
- B. H2SO3
- C. H3SO3
- D. H3SO4 Discuss
- 9. The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.
Options- A. Crystallisation
- B. Crystallisation
- C. Evaporation
- D. Evaporation Discuss
- 10. The substances which have very low ignition temperature and can easily catch fire with a flame are called _____________ substances.
Options- A. hazardous
- B. perilous
- C. incombustible
- D. inflammable Discuss
Chemistry problems
Search Results
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: 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: 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: 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: Quartz
Explanation:
Semiconductors 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.
Correct Answer: One normal
Explanation:
Normality is a way of expressing concentration of a solution and can be calculated by the formula-
Normality (N) = No. of gram equivalent of solute/ volume of solution (in litre)
Gram equivalent weight of H2 SO4 = Molecular weight/ No. of Hydrogen atom = 98/2 = 49 gm
No. of gram equivalent in 49 gm of H2 SO4 = 1
So, Normality in 1 litre of solution = 1/1 = 1 N
Correct Answer: difference amongst
Correct Answer: H2SO3
Correct Answer: Crystallisation
Correct Answer: inflammable
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