Question Discussion & Solution

The pattern followed is:

Hence, the correct answer is "72".

The correct answer is Musca domestica.

• The scientific name of Housefly is Musca domestica.

Additional Information 

The correct answer is Bahlul Khan Lodhi.

Key Points

• Bahlul Khan Lodhi is the founder ruler of the Lodhi Dynasty.

Additional Information 

• Lodi Dynasty (1451 to 1526)
  • Bahlul Khan Lodi (1451-1489 AD)
    • He was the founder of the Lodi dynasty.
    • He served as the Subedar (Governor) of Lahore and Sirhind during the reign of Muhammad Shah.
    • He tried to re-establish the greatness of the Delhi Sultanate, hence he had recaptured the areas around Delhi.
    • His most successful war was against the ruler of Jaunpur "Mahmud Shah Sharki".
    • The territories conquered by Bahlol Lodi were Mewat (Ahmed Khan), Sambhal (Dariya Khan), Kol (Isa Khan), Suket (Mubarak Khan), Manipur and Bhongaon (Raja Pratap Singh), Rewari (Qutub Khan), Etawah And Chandawar.
    • In 1498 AD, the able son of Bahlol Lodi, Nizam Shah, came to power in the name of "Sultan Sikandar Shah".
  • Sikandar Shahi (1489-1517 A.D.)Ibrahim Lodi (1518-1526)
    • He was the most qualified of three Lodi rulers who had conquered the king of Bihar and Tirhut.
    • Sikandar Lodi expanded his empire by conquering areas like Dholpur and Chanderi.
    • He kept a strict vigil on his nobles and jagirdars and strictly suppressed the rebellion carried out by them.
    • He had established an efficient espionage system and also arranged for the checking of government accounts.
    • He reduced the restrictions placed on trade, which boosted the economic prosperity of the people. For the measurement of agricultural land, he introduced a "Gaja-e- Sikandari" (Alexander Yard)  or 32 inches.
    • He shifted his capital from Delhi to Agra, which was established by him.
  • Ibrahim Lodi
    • Ibrahim Lodi was stubborn and intolerant which were not good qualities in a ruler.
    • Nobles were killed cruelly and many nobles were humiliated by Ibrahim Lodi.
    • He also treated his son Dilwar Khan Lodi cruelly.
    • Invasion of India was done by Kabul ruler, Babur, at the behest of Daulat Khan, a very powerful noble from Punjab.
    • In the 1st battle of Panipat in the year 1526 A.D, Ibrahim Lodi faced defeat at the hands of Babur

The Correct Answer is Magnetic Force.

• Magnetic resonance imaging ( MRI) is one of the most popular medical imaging methods used in the world at many diagnostic centers.
• These MRI scanners use strong magnetic fields, gradients of the magnetic field, and radio waves to produce images of the organs inside the body.
• The magnetic force is a component of the electromagnetic force, one of nature's four basic forces, which is induced by charge movement.
• There would be a magnetic force of attraction between two objects containing charge in the same direction of motion, while objects in charge traveling in opposite directions have between them a repulsive force.

The correct answer is Calcium Carbonate.

Key Points

• The chief component of the nacre that constitutes the pearl is aragonite (CaCO₃).
• Nacre also contains a small amount of conchiolin, a hornlike organic substance (albuminoid) that is the main constituent of the mollusc's outer shell.
• Pearl also contains Magnesium Carbonate(MgCO₃) along with Calcium Carbonate.

Additional Information

• Calcium carbonate is a common substance found in rocks as the minerals calcite and aragonite and is the main component of eggshells, snail shells, seashells, and pearls. 
• The Molar Mass of Calcium Carbonate is 100.0869 g/mol.
• Melting point: 825 °C.