**Dell Recruitment Exam - Aptitude Practice Questions**

Dell is an American multinational computer technology company based in Round Rock, Texas, United States, that develops, sells, repairs, and supports computers and related products and services.Here is a set of sample questions based on previous year placement papers that will help you in your preparation for the exam.

**Dell Aptitude Questions**

**Question 1:**

Given set of numbers: -7, -8, -9,0,7,8,9

What is the probability of the absolute value of the chosen number being less than 8?

(a) 4/7

(b) 3/7

(c) 3/5

(d) 1/7

**Answer: (b)**

Sample space = {-7, -8, -9, 0, 7, 8, 9}

Favourable outcome = {0,7,-7}

Required probability = 3/7

**Question 2:**

If the radius of a sphere is doubled, what is the change in its volume?

(a) Becomes 8 times

(b) Becomes 2 times

(c) Becomes ½ times

(d) Becomes 4 times

**Answer: (a)**

Volume of sphere, V = (4/3) x π x r3

New volume = (4/3) x π x (2r)3

= (4/3) x π x 8r3

=8V

**Question 3:**

In a box of two dozen apples, what can be the ratio of rotten and unrotten apples?

(a) 5:3

(b) 4:1

(c) 5:4

(d) 3:7

**Answers: (a)**

2 dozen apples=24 apples

Sum of the component in the ratio of rotten and unrotten apples has to be a factor of 24.

Option (a) satisfies the condition.

**Question 4:**

The total time taken by a train to cross a 250m platform at a speed of 36 km/hr is 35s. Find the length of the train?

(a) 150m

(b) 120m

(c) 110m

(d) 100m

**Answers: (d)**

Speed = 36 x 5/18 = 10 m/s

Distance travelled in 35s = 350m

Length of train is 350m-250m = 100m

**Question 5:**

The profit gained on selling 5 articles is equal to the selling price of 2 articles. Find the profit percentage.

(a) 20%

(b) 33.33%

(c) 60%

(d) 66.66%

**Answers: (d)**

SP of 5 articles=5x

P=2x

P=SP-CP so, CP=5x-2x = 3x

P% = (2x/3x)*100 = 66.66%

**Question 6:**

There are three wheels that complete 24, 60 and 36 revolutions respectively in one minute. There is a blue dot on the circumference of each wheel, touching the ground simultaneously at time zero. After how much time would this happen again?

(a) 50 s

(b) 5 s

(c) 10 s

(d) 6 s

**Answer: (b)**

Time taken by first wheel to complete one revolution = 60/24 = 5/2 sec

Time taken by second wheel to complete one revolution = 60/60 1 sec

Time taken by third wheel to complete one revolution = 60/36 = 5/3 sec

The dot will touch the ground simultaneously after LCM(5/2, 1, 5/3) time has passed.

LCM(5/2, 1, 5/3) = LCM(1,5,5)/HCF(1,3,2) = 5

**Question 7:**

A is thrice the age of B and C is half the age of A. The sum of their ages is 55 years.

(a) 10 years

(b) 15 years

(c) 30 years

(d) 20 years

**Answer: (c)**

Let the age of B be x.

Age of A = 3x

Age of C=1.5x

Total = 3x + 1.5x + x = 5.5x = 55

x=10

Age of A=30 years

**Question 8:**

The price of a chocolate increases by 10 % in the first year and then again by 10& in the second year. At the end of two years, the price is Rs. 121. Find the original price of the chocolate.

(a) 100

(b) 80

(c) 101

(d) 91

**Answer: (a)**

Let the original price of the chocolate be x.

Percentage change in price = 10+10+(10x10)/100 = 21%

So, 1.21x = 121

x = Rs. 100

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