Question Discussion & Solution

Pattern followed is,

D + 6 = J

J + 5 = O

O + 4 = S

S + 3 = V

V + 2 = X

Hence, “O” is the correct answer.

The correct answer is Ctrl + Z.

• Ctrl + Z is the shortcut key for undoing a task.

Key Points

• Undo is a function performed to reverse the action of earlier action.
• Any actions that were previously undone using the Undo function are restored using the Redo function.
• For example, if you entered a word and then used the undo function to remove it, the redo function would restore the erased word.

Additional Information

The correct answer is All of the above.

• Foreign Marriage Act,1969:
  • Section 4 of the act deals with the conditions relating to the solemnization of foreign marriages.

Key Points

• The act says that it solemnizes the marriage between parties one of whom which should be an Indian citizen under article 8 of the Indian Constitution or if the following conditions got satisfied:-
  • Spouse of both parties should not be living.
  • Both parties should be of sound mind.
  • At the time of marriage, the bridegroom should be of 21 years and the bride should be of 18 years.
  • Neither of the party is within the degree of prohibited relationship.
• With an element that personal law and custom laws governing at least one party permit marriage between them including that they are not within the degree of prohibited relationship.
• Section 5 of the act deals with the need for intended marriage.
• The section states that when a marriage is solemnized under this act the parties who got married have to give notice to the marriage officer of the district in writing specified in the First Schedule of the act.

The correct answer is Sodium and potassium.

Key Points

• Sodium and Potassium metals are the two metals which are soft and can be cut with a knife.
  • Both belong to Alkali metals [first group of periodic table]
  • They are reactive metals.
  • As the atomic size increases down the group, so the force of attraction between the valence electron and nucleus decreases. 
  • Metallic bonds are not strong.
  • Potassium is softer than sodium.

Additional Information 

• Mercury- In a liquid state at room temperature, It is unique as a metal.
  • Mercury (Hg), also known as quicksilver.
  • Atomic Number- 80
• Zinc- Related to low Melting group.
  • Atomic Number- 30
  • Symbol- Zn
• Tin- It is a soft silvery-white metal with a bluish tinge.
  • Atomic Number- 50
  • Symbol- Sn

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.