Saved Bookmarks
This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is a surface tension |
| Answer» It is define as the ratio of force and length | |
| 2. |
What is what is electromagnetic radiations |
| Answer» Electromagnetic radiation\xa0refers to the waves of theelectromagnetic\xa0field, propagating (radiating) through space carrying\xa0electromagnetic\xa0radiant energy. It includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-, and gamma radiations. | |
| 3. |
Is there any chemical formula of dust |
| Answer» C17H25N | |
| 4. |
What is avegrado\'s law not 6.022×1023 |
| Answer» Avogadro’s Law is one of the gas laws. At the beginning of the 19th century, an Italian scientist Lorenzo Romano Amedeo Carlo Avogadro studied the relationship between the volume and the amount of substance of gas present.The results of certain experiments with gases led him to formulate a well-known Avogadro’s Law.It states that, under the same conditions of temperature and pressure, equal volumes of different gases contain an equal number of molecules,orFora fixed mass of an ideal gas at constant pressure and temperature, the volume and amount of the gas are directly proportional. | |
| 5. |
Which is the most electronegative or electropositive element in periodic table? |
| Answer» most electronegative element Is FluorineMost electropositive elemet is Caesium (Cs) | |
| 6. |
What is Rydberg constant...? |
| Answer» 109678 no. is known as Rydberg constant | |
| 7. |
Define Bohr\'s model of atom |
| Answer» \xa0Theory of atomic\xa0structure in which the hydrogen\xa0atom\xa0(\xa0Bohr atom,) is assumed to consist of a proton as nucleus, with a single electron moving in distinct circular orbits around it, each orbit corresponding to a specific quantized energy state. | |
| 8. |
What is bird |
| Answer» | |
| 9. |
Round off 2.399 |
| Answer» 2.40 is the round of 2.399 | |
| 10. |
What wander wall radius |
| Answer» Covalent radius is half of the internuclear sepration between the nuclei of two sungle - bonded atoms of the same species (homonuclear). While van der waals radius is used to define half of the distance between the closest approach of two non bonded atoms of a given element | |
| 11. |
What is difference between Sigma and pii.? |
| Answer» A\xa0sigma bond\xa0is your basic head-on covalent\xa0bond, with the\xa0bondin line with the\xa0bonding\xa0orbitals. A\xa0pi bond\xa0is a covalent\xa0bond between\xa0orbitals perpendicular to the\xa0bond\xa0direction, usually p-orbitals (never s). | |
| 12. |
Give an example of a solid substance having high boiling point? |
| Answer» | |
| 13. |
Why in Rutherford experiment only gold foil was used not any other metal. |
| Answer» | |
| 14. |
Significant figures in 5003050 pencils? |
|
Answer» No there will infinite significant figures There will be six significant figures |
|
| 15. |
What are matter waves made up of |
| Answer» Matter\xa0is\xa0made\xa0of atoms, and atoms are\xa0made\xa0protons, neutrons and electrons. | |
| 16. |
Calculate sigma & pie bond of phosphorus |
| Answer» One sigma and one py | |
| 17. |
What is hydrogen spectrum |
| Answer» The emission\xa0spectrum\xa0of atomic hydrogen\xa0(n=3 to n=1) is divided into a number of\xa0spectral\xa0series, with wavelengths given by the Rydberg formula. These observed\xa0spectral\xa0lines are due to the electron making transitions between two energy levels in the atom. | |
| 18. |
Different between alkali and alkaline |
| Answer» | |
| 19. |
What will be the minumum pressure requried to compress 500dm3 of air at 1 bar to 200dm3 at 30oc |
| Answer» | |
| 20. |
Give reasonThe ionization enthalpy of Be is more than B |
| Answer» Because Be has configuration 1s^2 2s^2 whereasB has 1s^2 2s^2 2p^1 Be is having fully filled S orbital it is more diddicult to remove qn electron from fully dilled orbitals ans this is also due to penitrating S-orbital | |
| 21. |
Some basic concept of chemistry |
| Answer» | |
| 22. |
Example of resonence structure |
| Answer» Example for resonance structure is CO. We expect the double bond in carbon and oxygen atom. However carbon -oxygen bond length has been experimentally determined to be 113 pm. This lies between normal C= O (122pm) and C triple bond O (1.10pm) | |
| 23. |
why halogen have moat negative electron gain enthalpy |
| Answer» This is due to their small size and higher effective nuclear charge. Due to these two parameters halogens easily gain one electron to complete their octet and attain Noble gas configuration. | |
| 24. |
What is paramagnetic substance |
| Answer» These materials are slightly attracted by a magnetic field and the material does not retain the magnetic properties when the external field is removed. Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron paths caused by the external magnetic field. | |
| 25. |
What is sysgas |
| Answer» | |
| 26. |
What is the general form of P- orbital |
| Answer» General form of P- orbital = ns^2 np^1-6 | |
| 27. |
Give me diffrance between mandleev and periyodic table |
| Answer» There is just a bit difference betwewn both that in mendleev elements are located according to atomic mass but in modern priodic table element are located according to their isotopes increaseing no. Of outer most shells depending on quantum no. | |
| 28. |
What is molecular orbital theory |
| Answer» molecular orbital (MO) theory is a method for determining molecular structure in which electrons are not assigned to individual bonds between atoms, but are treated as moving under the influence of the nuclei in the whole molecule. | |
| 29. |
what is co-ordination number? |
| Answer» The coordination number of an atom in a molecule is the number of atoms bonded to the atom. In chemistry and crystallography, the coordination number describes the number of neighbor atoms with respect to a central atom. The term was originally defined in 1893 by Alfred Werner. The value of the coordination number is determined differently for crystals and molecules. The coordination number can vary from as low as 2 to as high as 16 | |
| 30. |
Why lone electrons are found in pairs? |
| Answer» | |
| 31. |
Explane thomson atom model |
| Answer» Thomson model of an atom explained that a positively charged sphere has negatively charged electrons embedded in it. It was even compared with plum pudding cake, watermelon etc. | |
| 32. |
Why the rain drops are in round shape. |
| Answer» Surface tension is responsible for the\xa0shape\xa0of liquid\xa0droplets. Although easily deformed,\xa0droplets\xa0of\xa0water\xa0tend to be pulled into a\xa0spherical shape\xa0by the cohesive forces of the surface layer. | |
| 33. |
The pyramidl geometry is associated witha) CH4b) NH3c) H2Od) CO2 |
| Answer» The NH3 molecular geometry (molecular shape) is trigonal pyramidal. The NH3 bond angles are 107 degrees because the hydrogen atoms are repelled by the lone pair of electrons on the Nitrogen atom. | |
| 34. |
How to balance equation by ion electronic method? |
| Answer» | |
| 35. |
How to find molar mass of a atom |
| Answer» Molar mass of atom is called atomic mass.To\xa0calculate the atomic mass\xa0of a single\xa0atom\xa0of an\xa0element, add up the\xa0mass\xa0of protons and neutrons. | |
| 36. |
Droback Mendleev\'s\' periodic table |
| Answer» Draw-backs of mendeleev \'s periodic table : (i) position of hydrogen was not justified. (ii) there was no space left for isotope in his table. (iii) some elements having higher atomic masses were placed before those having lower atomic masses (for example, CO with higher atomic mass placed before Ni having lower atomic mass) (iv) two similar elements like Cu and Hg were grouped differently (v) the position of actinoids and lanthanides were not included in this table. | |
| 37. |
What do you understand by afbaou principle |
|
Answer» The aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels (e.g., 1s before 2s).Aufbau is a German noun that means construction or "building-up". It States that orbital having less placed first and orbital having more energy placad after the orbital having less energy |
|
| 38. |
Calculate the total number of neutrons in 7mg of 14g carbon. |
| Answer» | |
| 39. |
Calculate the wavelength , frequency and wave number of a photon having energy equal to 19.95 j/mol |
| Answer» | |
| 40. |
What is mole fraction? |
| Answer» Mole fraction\xa0is another way of expressing the concentration of a solution or mixture. It is equal to the\xa0moles\xa0of one component divided by the total\xa0moles\xa0in the solution or mixture. | |
| 41. |
Why rain drops are in circular shape. |
| Answer» To reduce the energy of the molecule they tend to take up the circular shape so they can reduce surface area and hence reduce the number of molecules in their surface since water molecules at the surface has more energy compared to the water molecules at the bottom. | |
| 42. |
What is formula for calculating wavelength |
| Answer» Wavelength is the distance between the crests of a wave. Many different things can move like waves, like strings, water, the air (sound waves), the ground (earthquakes), and light can be treated as a wave. Wavelength is represented with the Greek letter lambda: λ. It is equal to the velocity of the wave, divided by the frequency. Wavelength is expressed in units of meters (m).{tex}Wavelength= {wave \\ veloctiy\\over frequency}{/tex}{tex}\\lambda = {v\\over f}{/tex}\xa0λ = wavelength, the distance between wave crests (m)v = wave velocity, the speed that waves are moving in a direction (m/s)f = frequency, the wave crests that go through a point in a certain time (cycles/s or Hz) | |
| 43. |
Explain the energy level diagram |
| Answer» | |
| 44. |
What is hydration energy |
| Answer» Hydration energy\xa0(also\xa0hydration enthalpy) is the amount of\xa0energy released when one mole of ions undergo\xa0hydration\xa0which is a special case of solvation. It is a special case of dissolution\xa0energy, with the solvent being water. | |
| 45. |
What is sub atomic particles |
| Answer» Particles that are smaller than the atom are called subatomic particles. The three main subatomic particles that form an atom are protons, neutrons, and electrons. The center of the atom is called the nucleus. | |
| 46. |
What is meant by IP |
| Answer» IP means ionization potential | |
| 47. |
What is bond angle? |
| Answer» A bond angle is the angle formed between three atoms across at least two bonds. | |
| 48. |
Fire is which state of matter? |
| Answer» Fire is actually a chemical reaction. It\'s an oxidation reaction to be specific. When wood gets hot enough (the part of the wood that is burning) the large hydrocarbons break down to charred solids and a gas. The gas is what reacts with\xa0oxygen\xa0in the atmosphere to produced light, CO2 and H2O. | |
| 49. |
What is Radiation. Explain with example |
| Answer» Radiation\xa0is the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes: electromagnetic\xa0radiation, such as heat, radio waves, visible light, x-rays, and gamma\xa0radiation\xa0(γ). | |
| 50. |
Define acceleration |
|
Answer» It is the rate of change of velocity with respect to time. It is btaye of change of velocity |
|