Question Discussion & Solution

The correct answer is between 13 to 20 days.

Key Points

• The life span of the WBC is between 13 to 20 days. 
• The life span of the RBC is 20-120 days and it gets destroyed in the spleen area of the human body to recycle Iron content.
• The life span of the blood platelets is 3-5 days. 
• WBC's are mainly responsible for the protection of the body from diseases.

Additional Information

 Important Points

• WBCs are also called leukocytes or white corpuscles.
• The life span of WBCs is 13 to 20 days.
• Total WBCs count ranges from 4,500 to 10,000.
• WBCs are a cellular component of the blood that lacks hemoglobin, has a nucleus, is capable of mobility, and producing antibodies.
• They act as a " Soldier or Guard " of our body.
• The size of WBCs is 12 to 17 µm in Diameter and about three times RBCs.
• WBCs do not have any Fixed shape, it may be circular, rhomboid, or any other shape.

All except Flower are type of Plants

The correct answer is Western disturbances.

Key Points

• Western Disturbances are responsible for the rainfall during winter over the northwestern part of India.
• The Western Disturbance originates in the mid-latitude region near Europe and the Atlantic Ocean.
  • The low pressure builds up over the Mediterranean Sea and moves over Iraq, Afghanistan, and Pakistan before entering India, and contains substantial amounts of moisture.
  • When these low-pressure systems reach the Indian subcontinent, they are blocked by the Himalayas and rain as snow over the northwestern plains and the higher reaches of the western Himalayas.
  • After precipitation over northwest India, they weaken and are devoid of moisture, they blow as dry winds that form dense fog over the northern plains of India.

Additional Information

• The period June to September is referred to as the Southwest Monsoon period.
  • Southwest Monsoon period is the principal rainy season for the Indian subcontinent.
  • This is the summer monsoon period where the southwest monsoon holds away over the country.
  • The whole country receives nearly 75% of its rainfall during this period.

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 the Helium nucleus.

• Helium nucleus was the source of alpha particles in the Rutherford scattering experiment.
• Ernest Rutherford, a British scientist conducted an experiment and proposed the atomic structure of elements.

Key Points

• Rutherford conducted an experiment by bombarding a thin sheet of gold with α-particles.
• He then analysed the trajectory of these particles after their interaction with the gold foil.
• Since very few α-particles were deflected back, and only a few α-particles had nearly 180^o angle of deflection.
• Hence he concluded that the volume occupied by the positively charged particles in an atom is very small as compared to the total volume of an atom.