CAT Questions

Q:

The First Mechanical Computer Designed by Charles Babbage was called?

A) Super Computer B) Abacus
C) Calculator D) Analytical Engine
 
Answer & Explanation Answer: D) Analytical Engine

Explanation:

Computer was invented by Charles Babbage.

The First Mechanical Computer Designed by Charles Babbage, a British mathematician was called as Analytical Engine which resembles today's modern machines  between 1833 and 1871.

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145 27092
Q:

Simplify: (157 x 157 + 143 x 143)

 

A) 45098 B) 46098
C) 90196   D) 91196
 
Answer & Explanation Answer: A) 45098

Explanation:
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Filed Under: Simplification
Exam Prep: Bank Exams , CAT

0 27026
Q:

What should be replaced in the place of '?' in the following series ?

QAR, RAS, SAT, TAU, ?

A) UAT B) UAV
C) UAS D) UTS
 
Answer & Explanation Answer: B) UAV

Explanation:

In this series, the third letter is repeated as the first letter of the next segment. The middle letter, A, remains static. The third letters are in alphabetical order, beginning with R.

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Filed Under: Number Series
Exam Prep: Bank Exams , CAT , GATE , GRE
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7 26990
Q:

How many times can you subtract 10 from 100?

A) 9 times B) 10 times
C) 1 time D) 0 times
 
Answer & Explanation Answer: C) 1 time

Explanation:

How many times can you subtract 10 from 100, for this if we go through logically, it is only 1 time. For the first time if we subtract 10 from 100, then there will no 100 to subtract from.

 

Hence, it is only 1 time we can subtract 10 from 100.

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65 26965
Q:

A pump can fill a tank with water in 2 hours. Because of a leak, it took 213 hours to fill the tank. The leak can drain all the water of the tank in:

A) 7 hours B) 8 hours
C) 12 hours D) 14 hours
 
Answer & Explanation Answer: D) 14 hours

Explanation:

If the total area of pump=1 part

The pumop take 2 hrs to fill 1 part 

The pumop take1 hour to fill 1/2 portion 

 

Due to lickage  

The pumop take 7/3 hrs to fill 1 part 

The pumop take1 hour to fill 3/7 portion 

Now the difference of area = (1/2-3/7)=1/14 

 

This 1/14 part of water drains in 1 hour 

Total area=1 part of water drains in (1x14/1)hours= 14 hours 

 

So the leak can drain all the water of the tank in 14 hours. 

Leak will empty the tank in 14 hrs

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Filed Under: Pipes and Cistern
Exam Prep: CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk

86 26954
Q:

Pointing to a woman, a man said, "Her father is the only son of my father." How is the man related to the woman?

A) Father B) Brother
C) Uncle D) Brother-in-law
 
Answer & Explanation Answer: B) Brother

Explanation:

The man said, "Her father is the only son of my father."

Then the woman's father and the man's is the same

=> The woman and the man are brother and sisters.

 

Hence, the man is the brother of the woman.

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Filed Under: Blood Relations
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58 26942
Q:

If goods be purchased for Rs.450 and 1/3 is sold at a loss of 10%. At what gain % should the remainder is sold to has to gain 20% on the whole transaction?

A) 35% B) 28%
C) 22% D) 19%
 
Answer & Explanation Answer: A) 35%

Explanation:

Given the cost price of the articles = Rs. 450

To get overall 20% gain,

Total Selling Price = (20/100) x 450 = 540


One third of the CP = 1/3 x 450 = Rs. 150

But given 1/3 of articles are sold at 10% loss

S.P of 1/3 of articles = 90% of 150

= 90 x 150/100 = 135

 

Then, S.P on remaining 2/3 goods must be

= 450 - 135 = 405 ...........(1)

CP on remaining goods

= 2/3 x 450 = 300 ............(2)


Profit = SP - CP = 405 - 300 = 105


Profit %  = (105/300) x 100

= 35%.

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Filed Under: Profit and Loss
Exam Prep: AIEEE , Bank Exams , CAT
Job Role: Analyst , Bank Clerk , Bank PO

45 26798
Q:

Brightness of bulb depends on voltage or current?

A) Current B) Voltage
C) Both A & B D) None
 
Answer & Explanation Answer: C) Both A & B

Explanation:

Brightness of bulb depends on both voltage and current. The brightness depends on power.

Since we know that  Power (P) = Voltage x Current = V I

So whether you increase the current or the voltage the brightness will increase.

 

Example Illustration:

 If you connect a long bulb and a round bulb in series, the long bulb glows but the round bulb does not. Both of them have the same current flowing through them (they are in series) but the long bulb has a greater voltage across it because it has more resistance (even though V= IR is not obeyed exactly, voltage drop does depend on the resistance). If you connect a round bulb and a long bulb in parallel, however, it is the round bulb that is brighter because now the voltage across both bulbs is the same but the current is larger through the round bulb (smaller resistance).

 

Hence, the brightness of a bulb depends on power i.e, both voltage and current.

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Filed Under: Physics
Exam Prep: AIEEE , Bank Exams , CAT , GATE , GRE
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