CAT Questions

Q:

Consider 5 independent Bernoulli’s trials each with probability of success p. If the probability of at least one failure is greater than or equal to 31/32 , then p lies in the interval ?

A) [1, 32] B) (0, 1)
C) [1, 1/2] D) (1, 1/2]
 
Answer & Explanation Answer: C) [1, 1/2]

Explanation:

Probability of atleast one failure
= 1 - no failure > 31/32
= 1 - P5 > 31/32
=  P5<1/32
= p < 1/2
Also p > 0
Hence p lies in [0,1/2].

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Filed Under: Probability
Exam Prep: CAT , AIEEE
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5 6033
Q:

Who is the first Indian to take a hat trick in an international test ?

A) Jasu Patel B) Kapil Dev
C) Harbajan Singh D) B. S. Chandra Sekhar
 
Answer & Explanation Answer: C) Harbajan Singh

Explanation:
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Filed Under: Sports
Exam Prep: Bank Exams , CAT
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13 6032
Q:

A and B started a business after investing Rs. 12,000 and Rs. 14,400 respectively. At the end of the year B gets 12% of the total profit as management fees and the rest amount is distributed between both the partners in the ratio of their investments. If total annual profit is Rs. 7,500, then find the difference between their profits.

A) Rs. 1250 B) Rs. 600
C) Rs. 900 D) Rs. 1500
 
Answer & Explanation Answer: D) Rs. 1500

Explanation:

From the given data,

Ratio of capital = 12000 : 14400 = 5 : 6

Required Difference = 

6 - 56 + 5 88100 x 7500 + 12100 x 7500= 111 x 88 x 75  + 12 x 75= 600 + 900= 1500

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Filed Under: Partnership
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8 6027
Q:

Ajay and his wife Reshmi appear in an interview for two vaccancies in the same post. The Probability of Ajay's selection is 1/7 and that of his wife Reshmi's selection is 1/5. What is the probability that only one of them will be selected?

A) 5/7 B) 1/5
C) 2/7 D) 2/35
 
Answer & Explanation Answer: C) 2/7

Explanation:

P( only one of them will be selected) = p[(E and not F) or (F and not E)] 

 = PEFFE 

 

PEPF+PFPE

 

 =17×45+15×67=27

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Filed Under: Probability
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17 6026
Q:

At what time will B catch up with A, if A starts from a place at 11.00 A.M. and travels at a speed of 3.5 kmph, B starts at 1.00 P.M. and travels with speeds of 1 kmph for 1 hour, 2 kmph for the next 1 hour, 3 kmph for the next 1 hour and so on.

A) 8 : 47 pm B) 6 : 40 pm
C) 8 : 42 pm D) 7 : 40 pm
 
Answer & Explanation Answer: D) 7 : 40 pm

Explanation:

At 1 pm ... Distance between A and B = 2x3.5 = 7 kms
at 2 pm .....Distance between A and B = 7 + 3.5 - 1 = 9.5 kms
At 3 pm ....Distance between A and B = 9.5 + 3.5 - 2 = 11 kms.
..
..
..
At 7 pm distance between A and B = 3 kms.
From 7 pm to 8 pm, speed of A = 3.5 kmph
speed of B = 8 kmph
Relative speed = 4.5 kmph

Time taken by B to meet A = 3/4.5 hrs = 30/45 hrs = 120/3 mins = 40 mins.

So meeting time is 7 : 40 PM.

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Filed Under: Arithmetical Reasoning
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2 6024
Q:

A passenger train covers the distance between station K and L, 40 minutes faster than a goods train. Find this distance between K and L if the average speed of the passenger train is 50 km/h and that of goods train is 30 km/h?

A) 50 kms B) 48 kms
C) 46 kms D) 44 kms
 
Answer & Explanation Answer: A) 50 kms

Explanation:

Let the distance be 'd' kms.

According to the given data,

d30 - d50 = 4060 hrs=> 6d = 300=> d = 50 kms.

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Filed Under: Problems on Trains
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16 6021
Q:

Mature : Regressed :: Varied : ?

A) Monotonous B) Rhythmice
C) Obsolete D) Decorous
 
Answer & Explanation Answer: A) Monotonous

Explanation:

The words in each pair are opposites of each other.

Here Mature and Regressed are opposite to each other. Then the required word should be opposite of varied and it is monotonous.

 

Hence, Mature : Regressed :: Varied : Monotonous.

 

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Filed Under: Analogy
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6 6021
Q:

Which part of a computer performs calculations?

A) Control unit B) Arithmetic and logical unit
C) Both A & B D) Logic bus
 
Answer & Explanation Answer: B) Arithmetic and logical unit

Explanation:

A computer has a CPU which is called as Central Processing UNit or a Processor builton the mother board. It has many components like control unit and Arithmetic and logical unit. 

 

The Arithmetic and logical unit of the CPU performs the arithmetic operations or mathematical calculations.

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Filed Under: Computer
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6 6020