CLAT Logical Reasoning & Quantitative Techniques 5

Question 1

Two pipes can fill a tank in 20 and 30 minutes respectively. A drain can empty it in 15 minutes. If all three are open together, in how many minutes will the tank be filled?

Accepted Answer

The tank will never fill.

Answer

Net rate = 1/20 + 1/30 − 1/15 = 3/60 + 2/60 − 4/60 = 1/60 − 0 = −1/60, which is negative, so the drain empties faster than the pipes fill and the tank never fills.

Question 2

Argument: 'Speed limits should be abolished because experienced drivers can judge safe speeds.' Which assumption underlies this argument?

Accepted Answer

Experienced drivers' judgment is always reliable and sufficient for safety.

Answer

The argument assumes experienced drivers' judgment is a reliable and sufficient substitute for standardized speed limits.

Question 3

If Monday is the 15th of a month and the month has 31 days, on what day does the last day of the month fall?

Accepted Answer

Sunday

Answer

From the 15th (Monday) to the 31st is 16 days; 16 mod 7 = 2, so two days after Monday = Wednesday — wait: 15+16=31, 16 days later; Monday + 16 = Monday+2 weeks+2 days = Wednesday.

Question 4

A passage states: 'Eyewitness testimony is often unreliable due to memory distortions.' Which conclusion is best supported?

Accepted Answer

Eyewitness testimony should be corroborated with additional evidence before being relied upon.

Answer

The passage supports caution about eyewitness testimony, suggesting corroboration is prudent, not that it should be categorically excluded.

Question 5

Statements: All laws are rules. Some rules are guidelines. Conclusion I: Some laws are guidelines. Conclusion II: All guidelines are laws.

Accepted Answer

Neither I nor II follows.

Answer

We cannot determine whether the laws that are also rules overlap with the rules that are guidelines, so neither conclusion necessarily follows.

(CLAT) Common Law Admission Test Practice Test

(CLAT) Common Law Admission Test Practice Test

CLAT Logical Reasoning & Quantitative Techniques 5