Data Sufficiency








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Quiz Begins Here

Q #1
⏰ :

Directions: Read the rules listed below.

  1. Statement (a) ALONE is sufficient to answer the question, but statement 2 alone is NOT sufficient. 
  2. Statement (b) ALONE is sufficient to answer the question, but statement 1 alone is NOT sufficient. 
  3. BOTH statements (a) and (b) TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient. 
  4. Each statement ALONE is sufficient to answer the question. 
  5. Statements (a) and (b) TOGETHER are NOT sufficient to answer the question.

  1. The two persons A and B moving around a circular track, starting from a same point and at the same time. At What time will the two persons meet while moving?
  1. A moves at a constant speed of 5m/s ,while B starts at A speed of 2m/s and increases his speed by 0.5m/s at the end of every second thereafter.
  2. B can complete one entire lap in exactly 10 sec.     

Discuss
+

Explanation: You don’t know whether they are moving in the same direction or in the opposite direction.

Q #2
⏰ :

Directions: Read the rules listed below.

  1. Statement (a) ALONE is sufficient to answer the question, but statement 2 alone is NOT sufficient. 
  2. Statement (b) ALONE is sufficient to answer the question, but statement 1 alone is NOT sufficient. 
  3. BOTH statements (a) and (b) TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient. 
  4. Each statement ALONE is sufficient to answer the question. 
  5. Statements (a) and (b) TOGETHER are NOT sufficient to answer the question.

A and B undertake a work of digging aditch ,alternately  for a day each. If A can dig a ditch in “a” days and B can dig a ditch in “b” days ,will the work be completed faster if A begins?

  1. For a positive integer N , N(1/a  + 1/b ) =1.
  2. b > a

Discuss
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Explanation: If N is a positive integer , it would not make the difference who would start the work Since the work would be completed in number of days which would be a multiple of 2.So it does not make the difference who starts the work. It would make the only if N is not an integer.

Q #3
⏰ :

Directions: Read the rules listed below.

  1. Statement (a) ALONE is sufficient to answer the question, but statement 2 alone is NOT sufficient. 
  2. Statement (b) ALONE is sufficient to answer the question, but statement 1 alone is NOT sufficient. 
  3. BOTH statements (a) and (b) TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient. 
  4. Each statement ALONE is sufficient to answer the question. 
  5. Statements (a) and (b) TOGETHER are NOT sufficient to answer the question.

By how much percentage has the Total surface area has increased of a Cylinder?

  1. Lateral Surface Area has increased by 10 %
  2. Curved Surface Area has increased by 20%

Discuss
+

Explanation: The rule is if two thing are getting added up and u don’t know their values , u would never be able to determine the percentage change in its total surface area. If two things are multiplied and then u can evaluate their percentage change even without knowing their values.

Q #4
⏰ :

Directions: Read the rules listed below.

  1. Statement (a) ALONE is sufficient to answer the question, but statement 2 alone is NOT sufficient. 
  2. Statement (b) ALONE is sufficient to answer the question, but statement 1 alone is NOT sufficient. 
  3. BOTH statements (a) and (b) TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient. 
  4. Each statement ALONE is sufficient to answer the question. 
  5. Statements (a) and (b) TOGETHER are NOT sufficient to answer the question.

By how much percentage has the Total surface area has increased of a Cylinder?

  1. Radius of the circle has increased by 10 %
  2. Height has increased by 20%

Discuss
+

Explanation: You will be able to determine the percentage change in the lateral surface area as well as in curved surface area . But not in the case of their addition .

Q #5
⏰ :

Directions: Read the rules listed below.

  1. Statement (a) ALONE is sufficient to answer the question, but statement 2 alone is NOT sufficient. 
  2. Statement (b) ALONE is sufficient to answer the question, but statement 1 alone is NOT sufficient. 
  3. BOTH statements (a) and (b) TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient. 
  4. Each statement ALONE is sufficient to answer the question. 
  5. Statements (a) and (b) TOGETHER are NOT sufficient to answer the question.

In a class of   30 students , Rashmi secured the third rank among the girls , while her brother Kumar studying in the same class secured the sixth rank in the whole class.Between the two , who had a better overall rank ?

  1. Kumar was among the top 25% of the boys merit list in the class in which 60% were boys.
  2. There were three boys among the top 5rank holders , and three girls among the top ten rank holders.

Discuss
+

Explanation: From statement (a) ,we can’t tell whether kumar is higher in rank to Rashmi or not. From statement (b) , Top-5 have 3 boys.Sixth rank is kumar.Hence there are only 2 girls above Kumar. Hence statement (b) alone is sufficient.