Question Discussion & Solution

Hence, “49” should come next.

• A mistake is essentially any programmer action that later shows up as an incorrect result during program execution
• A programmer may commit a mistake in almost any development activity; For example, during coding a programmer might commit the mistake of not initializing a certain variable or might overlook the errors that might arise in some exceptional situations such as division by zero in an arithmetic operation, both these mistakes can lead to an incorrect result

CONCEPT:

Rutherford’s Model of the Atom:

• He bombarded the beam of alpha particles on a very thin gold foil.
• While bombarding he observes the number of scattering of particles –
  • Most of the particles passed either un-deviated or with a very small deviation.
  • Some deviated by large angles
  • 1 out of 8000 was deflected by more than 90°
• The conclusion to this deflection:
  • Most of the space of an atom is empty.
  • At the centre of an atom having a tiny positively charged particle called a nucleus.
  • The centre nucleus has all the mass of an atom.
  • The amount of positive charge at the nucleus is equal to the total amount of negative charges on all the electrons of the atom.
  • All the electrons revolve around the nucleus and coulomb force provide the centripetal force

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EXPLANATION:

• After the α -particles scattering experiment, the following conclusions were made by Rutherford as regard as atomic structure:

• Most of the mass (at least 99.95%) and all of the charge of an atom concentrated in a very small region is called the atomic nucleus. Therefore option 4 is correct.
• The nucleus consists of proton and neutron, in which proton was first discovered by Rutherford but neutrons were later discovered by James Chadwick in 1932.
• In an atom, there is maximum empty space and the electrons revolve around the nucleus in the same way as the planets revolve around the sun and the nnumber of protons and electrons inside an atom are equal under normal conditions (non-ionized). 

The correct answer is Subscript.

Key Points

• CTRL+EQUAL SIGN Apply subscript formatting.
• CTRL+SHFT+PLUS SIGN Apply superscript formatting.

Additional Information

• CTRL+SHFT+> Increase the font size.
• CTRL+SHFT+< Decrease the font size.
• CTRL+] Increase the font size by 1 point.
• CTRL+[ Decrease the font size by 1 point. 

The correct answer is Sulphur.

• The sulphur is the eye irritating compound that is released when cutting onions.
• The syn-Propanethial-S-oxide is the chemical irritant produced by an onion.
• This chemical stimulates the eyes' lachrymal glands which release tears.
• Previously scientists used to blame enzyme alinase for the instability of substances in a cut onion.
• In 2002, a study in Japan proved that lachrymatory factor synthase is responsible for irritation of the eyes.