Common Admission Test (CAT) Questions and Answers with Explanation

Q:

In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there ?

A) 205	B) 194
C) 209	D) 159

Answer & Explanation Answer: C) 209

Explanation:

We may have (1 boy and 3 girls)or(2boys and 2 girls)or(3 boys and 1 girl)or(4 boys).

Required number of ways = ( ${}^{6}C_{1} \times {}^{4}C_{3}$ ) + $({}^{6}C_{2} \times {}^{4}C_{2})$ + ( ${}^{6}C_{3} \times {}^{4}C_{1}$ ) + ( ${}^{6}C_{4}$ )

= (24+90+80+15)

= 209.

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Filed Under: Permutations and Combinations
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7 3921

Q:

Whose trademark is the operating system unix?

A) Ashton Tate	B) Microsoft
C) INTEL	D) BELL Laboratories

Answer & Explanation Answer: D) BELL Laboratories

Explanation:

BELL Laboratories trademark is the operating system unix.

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Filed Under: Computer
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4 3919

Q:

Energy is measured in units called

A) Newtons	B) Watts
C) Joules	D) Ohm/mtr

Answer & Explanation Answer: C) Joules

Explanation:

Energy is measured in units called Joules.

Joule is unit of work or energy in the International System of Units (SI) which is equal to the work done by a force of one newton acting through one metre.

1 Joule = 10⁷ ergs or 0.7377 foot-pounds.

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Filed Under: General Science
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4 3919

Q:

What is name of Three Indians who has made it to the MIT Technology Review magazine's Innovators under 35 list in 2017 ?

A) Suchi Saria	B) Radha Boya
C) Neha Narkhede	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

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Filed Under: Famous Personalities
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6 3917

Q:

Which of the following is not true about listening?

A) It involves conscious psychological action.	B) Attention and meaning given to sounds turns hearing in to listening.
C) It is a passive, constant process.	D) It is an active and selective process.

Answer & Explanation Answer: C) It is a passive, constant process.

Explanation:

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Filed Under: English
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2 3914

Q:

"Tigris River" flows through which of the following countries ?

A) Iran	B) Italy
C) Iraq	D) Egypt

Answer & Explanation Answer: A) Iran

Explanation:

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Filed Under: World Geography
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16 3910

Q:

In the following question four words are given of which two words are most nearly the same or opposite in meaning. Find the two words.

(A) Soft (B) Fatiguing (C) Discordant (D) Force

A) A-B	B) A-C
C) A-D	D) B-C

Answer & Explanation Answer: B) A-C

Explanation:

Meaning of Discordant = Harsh

That implies Harsh opposite is soft.

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Filed Under: Analogy
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13 3907

Q:

Malleability and Ductility of metals can be accounted due to

A) the crystalline structure in metal	B) the interaction of electrons with metal ions in the lattice
C) the presence of electrostatic force	D) the capacity of layers of metal ions to slide over the other

Answer & Explanation Answer: D) the capacity of layers of metal ions to slide over the other

Explanation:

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Filed Under: Physics
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4 3907

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