Question Discussion & Solution

Key Points

A binary tree is a tree data structure in which each node has at most two child nodes.

The number of subtrees of a node is called the degree of the node. In a binary tree, all nodes have degrees o, 1, and 2. 

The degree of a tree is the maximum degree of a node in the tree. A binary tree is of degree 2. The number of nodes of degree 2 in Tis "n-1".

Hence the correct answer is n-1.

The correct answer is Displacement.

Key Points

•  Displacement
  • When a body moves from one position to another, the shortest distance between the initial position and final position of the body along with direction is known as Displacement.
  • Its SI unit is a meter.
  • It is a vector quantity.
  • Displacement of the object can be positive, negative, zero.
  • Displacement of the object can never be greater than the distance traveled by it.
• When there is no change in an initial position and final position even after covering some path, then it is considered zero displacements.

Additional Information

• Distance
  • It is the actual path covered by a moving body irrespective of the direction in which the body travels.
  • Its SI unit is a meter.
  • It is a scalar quantity.
  • An odometer is used to measure the distance traveled by the vehicle.  
• Speed
  • The time rate of change of position of the object in any direction is called the speed of the object.
  • It is a scalar quantity.
  • Its SI unit is m/s.
  • Speed= Distance travelled/Time taken
• Frequency
  • It tells us how frequently an event occurs.
  • The number of complete waves produced in one second is called the frequency of the waves.
  • Hertz is the SI unit of Frequency. It is named in the honor of Rudolf Hertz.
  • 1 Hertz= 1 vibration per second.

Concept:

• Potential Energy: The energy of an object obtained by doing work against the conservative forces like spring force and gravitational force is called potential energy.
• The Gravitational potential energy of an object at a height h from the ground is given as

P = mgh

The spring potential energy of spring when it is stretched x distance from its natural length is given as

 \(P = \frac{1}{2}kx^2\)

• Kinetic Energy: The energy obtained by an object by virtue of its motion is called kinetic energy.

\(K = \frac{1}{2}mv^2\)

K is kinetic energy, v is the speed of the object, m is the mass of the object.

• Mechanical Energy: The sum of potential energy and kinetic energy is called mechanical energy.

Explanation:

So, from the above concept, it is clear that total mechanical energy is the sum of potential energy and kinetic energy. 

So, the answer is the Sum of Kinetic Energy and Potential Energy.

The Correct Answer is Option (2) i.e Pancreas.

Key Points

• In humans, the kidney is one of the main organs of the excretory system.
• The kidney's function is the filtration of the blood and removing waste(toxic) products.
• Waste products and excess fluid are removed through the urine.
• If the kidney fails person needs to undergo dialysis.
• Dialysis is a treatment that filters and purifies the blood using a machine
• The human excretory system includes certain organs that eliminate the wastes such as salts, carbon dioxide, urea, uric acid and water produced by the body.
• The path of the urine in the human excretory system is -
• After filtering from the kidney → The urine through Ureter → Stored in the Urinary bladder → Exits through the urethra.

Important Points

• The Pancreas is an organ located in the abdomen. It is not a part of the human excretory system.
• The Pancreas plays an important role in converting the food we eat into fuel for the body's cell.
• It helps in the process of digestion. It also regulates blood sugar.
• The body system that removes metabolic wastes from the body is known as the 'Excretory System'.

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: