GATE Questions

Q:

If x = 2 + 223 + 213 then find the value of x3-6x2+6x ?

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: B) 2

Explanation:

Given that x = 2+ 223 + 213

 

So x - 2 = 223 + 213

 

Now cubing on both sides, we get

 

 

=> x3-8-6x2+12x = 4 + 2 + 6(x-2)

 

Therefore, x3-6x2+6x = -6 + 8 = 2

 

 

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Filed Under: Square Roots and Cube Roots
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11 3508
Q:

Which of the following is not a prime number?

A) 5 B) 11
C) 21 D) 37
 
Answer & Explanation Answer: C) 21

Explanation:

A prime number is a whole number greater than 1 whose only factors are 1 and itself.

 

Factors of 5 are 1, 5

Factors of 11 are 1, 11

Factors of 21 are 1, 3, 7, 21

Factors of 37 are 1, 37.

 

Hence, according to the definition of a prime number, 21 is not a prime number as it has more than two factors.

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Filed Under: Numbers
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6 3505
Q:

I always run but never walk, often murmur, never talk, have a bed but never sleep, have a mouth but never eat. Who am I?

I_always_run_but_never_walk,_often_murmur,_never_talk,_have_a_bed_but_never_sleep,_have_a_mouth_but_never_eat1551358331.jpg image

A) Forest B) Fire
C) River D) Mountain
 
Answer & Explanation Answer: C) River

Explanation:

River.

It always runs  or flows but never walks.

It will sound like murmuring but never talks.

It has bed but never sleeps.

It has mouth but never eats.

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6 3505
Q:

The process of collecting, organizing and analyzing data is called

A) Statistics B) Data collection
C) Probability D) Systematic evaluation
 
Answer & Explanation Answer: A) Statistics

Explanation:

The process of collecting, organizing and analyzing data is called Statistics.

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0 3502
Q:

Who gave the slogan Inquilab Zindabad?

A) Hasrat Mohani B) Ashfaqulla Khan
C) Bhagat Singh D) Chandrashekhar Azad
 
Answer & Explanation Answer: A) Hasrat Mohani

Explanation:

Inquilab Zindabad means "Long live the revolution!". The slogan Inquilab Zindabad was given by Hasrat Mohani.

 

                                        who_gave_the_slogan_inquilab_zindabad1556950189.png image

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Filed Under: Indian History
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2 3501
Q:

Which tennis player has won the Grand Slam title in men's singles 2019?

A) Rafael Nadal B) Roger Federer
C) Novak DJokovic D) Daniil Medvedev
 
Answer & Explanation Answer: A) Rafael Nadal

Explanation:

Rafael Nadal defeated Daniil Medvedev in the men's singles title at the 2019 US Open. It was Nadal's 19th Grand Slam singles title, and fourth US Open title.

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Filed Under: Sports
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38 3501
Q:

Express 3/8 and 1/10 as a Decimals?

A) 1.375 & 1 B) 0.375 & 1
C) 13.75 & 1.1 D) 0.375 & 0.1
 
Answer & Explanation Answer: D) 0.375 & 0.1

Explanation:

3/8 as a Decimal :

In this we should convert the denominator into 10, 100, 1000, 10000, 100000,... to make it simple.

Now to make 8 into 1000, we multiply numerator and denominator with 125

=> 3 x 1258 x 125 = 3751000 = 0.375

 

1/10 as a Decimal :

1 divided into 10 parts of each 0.1.

 

Therefore, 3/8 = 0.375 and 1/10 = 0.1 in decimals.

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Filed Under: Decimal Fractions
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3 3496
Q:

What least number must be substracted from 627349 so that the remaining number is divisible by 15 ?

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: D) 4

Explanation:

On dividing 627349 by 15, we get remainder = 4.
Therefore, the obtained remainder is the least number to be subtracted from the given number so that the the mnumber is divisible by 15.
Here 4 is the least number to be subtracted from 627349 so that it is divisible by 15.

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Filed Under: Numbers
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