Question Discussion & Solution

In the question figure, there are 2 square blocks. Half of both square blocks are shaded and the other half is blank. One of the square blocks has its left half shaded and another square block has its right half shaded. Thus, in the answer figure, the square block whose left half is shaded should have its right block shaded and the square block whose right half is shaded should have its left half shaded.

Therefore option 1, 2, and 4 gets eliminated.

Hence, the figure in option 3 is the correct answer.

Statement 1 and 2: correct

• OS allows the computer to manage its own resource such as memory, keyboard and printer

Statement 3: correct

• OS provides the user an easy to work user interface, so the user doesn’t have to learn a different UI every time.

Statement 4: correct

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 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.

Let Rahul’s age be x.

Let Rita’s age be y.

Let Ekta’s age be z.

⇒ x = y + 3

⇒ y = 4z – 3

⇒ x = 4z – 3 + 3

⇒ x = 4z

⇒ x/z = 4

⇒ x ∶ z = 4 ∶ 1