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Q:

How long will it take for two pipes A and B to fill an empty cistern if they worked alternately for an hour each ?

A. Working alone, Pipe A can fill the cistern in 40 hours
B. Pipe B is one third as efficient as Pipe A

A) Only A is sufficient B) Only B is sufficient
C) Both (A) and (B) are sufficient D) None

Answer:   C) Both (A) and (B) are sufficient



Explanation:

From statement A, we know that Pipe A can fill the tank in 40 hours. However, this information is not sufficient as we do not have the data for Pipe B. Hence, statement A alone cannot answer the given question.

From statement B, we know that Pipe B is one third as efficient as pipe A. However, we do not know the rate at which Pipe A fills the tank. Hence, we will not be able to find the rate at which Pipe B fills the cistern. Therefore, statement B alone is not sufficient to answer the question.

Now, if we combine the two statements, we know that Pipe A take 40 hours to fill the cistern.
Pipe B takes 120 hours to fill the cistern.

If they worked alternately, then either Pipe A could have started the cycle or Pipe B could have started the cycle.

If Pipe A started the sequence of filling alternately, then at the end of two hours, the two pipes together would have filled 1/40 + 1/120 = 1/30  th of the tank in an hour. Or the cistern will fill in 30 hours.

If Pipe B started the sequence, then at the end of 2 hours, the two pipes together would have filled 1/120 + 1/40 = 1/30 th of the tank in an hour. Or the cistern will fill in 30 hours.

As the answer obtained irrespective of which pipe started the sequence is the same, the correct answer is (3) - i.e., both the statement are sufficient to answer the question.

Q:

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.


Statements:


1. Some machines are kites.


2. No machine is a pigeon.


Conclusions:


I. Some machines are pigeons.


IL. All kites are pigeons.


Ill. Some kites are not pigeons.

 

A) Only conclusions I and III follow. B) Only conclusion II follows.
C) Only conclusions I and II follow. D) Only conclusion ITI follows.
 
Answer & Explanation Answer: D) Only conclusion ITI follows.

Explanation:
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Q:

Statements:


1. All books are magazines.


2. Some books are novels.


Conclusions:


I. Some magazines are books.


II. No magazine is a book.


III. No novel is a magazine.


IV. Some novels are books.

 

A) Only conclusions I, III and IV follow. B) Only conclusions I and IV follow.
C) Only conclusions II and III follow. D) Only conclusions I and II follow.
 
Answer & Explanation Answer: B) Only conclusions I and IV follow.

Explanation:
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Q:

In the question two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.

 

Statement I: All drinks are beverages

Statement II: No juices are beverages

 

Conclusion I: Some beverages are juices

Conclusion II: All juices are beverages

 

A) Only conclusion I follows B) Only conclusion II follows
C) Both conclusions I and II follow D) Neither conclusion I nor conclusion II follows
 
Answer & Explanation Answer: D) Neither conclusion I nor conclusion II follows

Explanation:
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Q:

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow from the statements.


Statements:


1. All helmets are objects.


2. Some helmets are vehicles.


Conclusions:


I. Some objects are helmets.


II. Some vehicles are helmets.


III. Some vehicles are objects.

 

A) Only conclusions I and III follow. B) Only conclusions II and ITI follow.
C) Only conclusions I and II follow. D) All conclusions I, II and ITI follow.
 
Answer & Explanation Answer: D) All conclusions I, II and ITI follow.

Explanation:
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Q:

Read the following question and decide which of the statements is sufficient to answer the question.

Statements:


1) AB = 5 cm


2) BC = 12 cm

 

A) Only statement 2 is sufficient B) Either statement 1 or 2 is sufficient
C) Both statement. 1 and 2 are sufficient D) Only statement 1 is sufficient
 
Answer & Explanation Answer: C) Both statement. 1 and 2 are sufficient

Explanation:
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Q:

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

 

Statements:

1. All laptops are computers.

2. Some tablets are laptops.

 

Conclusions:

I. All tablets are computers.

II. Some tablets are computers.

III. Some computers are laptops.

 

A) All conclusions I, II and III follow B) Only conclusions II and IIIfollow
C) Only conclusion II follows D) Only conclusion III follows
 
Answer & Explanation Answer: B) Only conclusions II and IIIfollow

Explanation:
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Q:

Read the given statements and conclusions carefully and select which of the conclusions logically follow(s) from the statements.


Statements:


• All liquids are fluid.


• All fluids are viscous.


Conclusions:


1. All viscous are liquids.


2. All liquids are viscous.

 

A) Only conclusion 1 follows B) All the conclusions follow
C) Only conclusion 2 follows D) No conclusion follows
 
Answer & Explanation Answer: C) Only conclusion 2 follows

Explanation:
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Q:

Read the Riven statements and the following conclusions carefully and select which of the conclusions logically follow(s) from the statements.


Statements:


• All spectacles are glass.


• All glass are sand.


Conclusions:


1. All spectacles are sand.


2. All sand are glass.

 

A) Only conclusion 2 follows. B) All the conclusions follow.
C) Only conclusion 1 follows D) None of the conclusions follows.
 
Answer & Explanation Answer: C) Only conclusion 1 follows

Explanation:
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