Question Discussion & Solution

The correct answer is option 2 i.e 19.

• Potassium is a member of the alkali group of the periodic table.
  • Symbol: K.
  • Atomic number: 19.
  • Belongs to group 1 in the periodic table.
  • First isolated in 1807 by Humphry Davy.
  • Sodium and Potassium are the elements known as soft metals(can cut with a knife with little force).
  • Potassium metal is kept in kerosene due to its high reactivity with water.
  • Potassium bicarbonate is the chemical used in fire extinguishers.
  • Potassium is the most common radioisotope in the human body.
  • Potassium is the second least dense metal after lithium.
• Atomic Number 17: Chlorine.
• Atomic Number 18: Argon.
• Atomic Number 20: Calcium.

Bahlul Lodhi was the founder of the Lodhi Dynasty in 1451. By the end of the 15th-century Bahlul Lodi firmly established the Lodi dynasty at Delhi. He succeeded in bringing a large area of North India under his control. After his death, his son Sikandar Lodi succeeded him to the throne.

• In the sixteenth century the Lodi Empire, under Sultan Sikandar Lodi, in North India reached its zenith.
• The annexation of Dholpur paved the way for the expansion of Afghan rule in the regions of Rajputana and Malwa. The forts of Narwar and Chanderi were annexed while the Khanzada of Nagaur acknowledged the suzerainty of the Lodi Sultan in 1510-11.
• In short, the whole of North India, from Punjab in the northwest to Saran and Champaran in north Bihar in the east, and Chanderi to the south of Delhi were brought under the Lodi rule.
• Unlike his father, Sultan Ibrahim Lodi had to face the hostility of the 108 Political Structures Afghan nobility soon after his accession to the throne in 1517.
• He found himself surrounded by powerful nobles bent upon weakening the center to gain an upper hand for themselves. His father had to fight against his brothers and relatives and was supported by the nobles who wanted to replace the princes in the resourceful provinces. Upon the death of Sultan Sikandar Lodhi, the nobles decided to divide the Empire between Sultan Ibrahim Lodi and his younger brother Prince Jalal Khan Lodi, the governor of Kalpi.

Hint

The rulers of Delhi:

The correct answer is CPU.

Key Points

• CPU (Central Processing Unit) -
  • It is the main part of the computer, it can also be called the 'brain of the computer'.
  • Its function is to process the inputs and instructions coming on the computer. 
  • This unit of computer performs arithmetic, logical, control functions, input functions, and output functions. 
  • It is also commonly known as a processor.

Additional Information

• Motherboard -
  • It is a printed circuit board installed in most electronic plants such as laptops, computers, etc.
  • It is also called the mainboard or system board.
  • The main part of the motherboard is its chipset.
• RAM (Random Access Memory) -
  • This is a type of memory, we also know it by the name of Primary Memory.
  • There are two types of RAM. Static RAM and Dynamic RAM

An animal walked 29 m south.

From here it turned right and walked 14 m.

Now it again turned right and walked 18 m.

Now it turned left and walked 27 m.

Animal facing West now.

Hence, option 2 is the correct answer.

Ocean is the mass of water.

Similarly,

Desert is the mass of sand.