Common Admission Test (CAT) Questions and Answers with Explanation

Q:

Virus doubles every 3 mins. It is 'K' in 1 hour, when was it K/4 ?

A) 29 min	B) 25 min
C) 54 min	D) 57 min

Answer & Explanation Answer: C) 54 min

Explanation:

If virus is K in 1hr i.e 60 min
then in 57 min it was K/2 as it doubles every 3 minutes
=> In 54 min it was K/4.
At 54 minutes it was K/4.

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Filed Under: Arithmetical Reasoning
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Q:

Out of sixty students, there are 14 who are taking Economics and 29 who are taking Calculus. What is the probability that a randomly chosen student from this group is taking only the Calculus class ?

A) 8/15	B) 7/15
C) 1/15	D) 4/15

Answer & Explanation Answer: B) 7/15

Explanation:

Given total students in the class = 60
Students who are taking Economics = 24 and
Students who are taking Calculus = 32
Students who are taking both subjects = 60-(24 + 32) = 60 - 56 = 4
Students who are taking calculus only = 32 - 4 = 28
probability that a randomly chosen student from this group is taking only the Calculus class = 28/60 = 7/15.

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Filed Under: Probability
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Q:

83% of 2350 = ?

A) 1889.95	B) 1912.35
C) 1875.25	D) 1950.50

Answer & Explanation Answer: D) 1950.50

Explanation:

83% of 2350 = ?

83/100 x 2350

=8.3 x 235

=1950.50

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Filed Under: Percentage
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12 5336

Q:

'Minamata' disease was caused by ?

A) Lead	B) Mercury
C) Cadmium	D) Zinc

Answer & Explanation Answer: B) Mercury

Explanation:

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Filed Under: Chemistry
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11 5332

Q:

$142^{2} \div \sqrt{1260.25} = ?$

A) 586	B) 578
C) 568	D) 566

Answer & Explanation Answer: C) 568

Explanation:

$142 x 142 x \frac{1}{\sqrt{1260.25}}$

=> $142 x 142 x \frac{1}{35.5} = 568$

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Filed Under: Simplification
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4 5329

Q:

60 percent of 2/7 of three-fourth of a number is 2664. What is the number ?

A) 20720	B) 21352
C) 25421	D) 24150

Answer & Explanation Answer: A) 20720

Explanation:

Let N be the required number.

=> $\frac{60}{100} x \frac{2}{7} x \frac{3}{4} x N = 2664$

=> N = 2664x2x7x5/9

=> N = 20720.

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Filed Under: Percentage
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10 5326

Q:

Guwahati High Court is the Judicature of

A) Arunachal Pradesh	B) Nagaland
C) Assam	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

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Filed Under: Indian History
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11 5326

Q:

A sum of money at simple interest amounts to Rs. 415 in 2 years and to Rs. 514 in 4 years. The sum is ?

A) Rs. 316	B) Rs. 251
C) Rs. 154	D) Rs. 294

Answer & Explanation Answer: A) Rs. 316

Explanation:

S.I. for 2 years = (514 - 415) = Rs. 99
S.I. for 1 year = 99/2

Principal = (415 - 99) = Rs. 316.

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Filed Under: Simple Interest
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2 5325

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