EduRev Placement Test - Computer Science Engineering (CSE) MCQ

Given the total number of students is 40, we can determine Seema's rank using either statement:

From Statement-1: 

• Priya is 31st from the bottom, so her rank from the top is 40 - 31 + 1 = 10.
• Since Priya is 4 ranks below Seema, Seema's rank from the top is 10 − 4 = 6.

From Statement-2: 

• Ena is 37th from the bottom, so her rank from the top is 40 − 37 + 1 = 4.
• Ena is 2 ranks above Seema, so Seema's rank from the top is 4 + 2 = 6.

In both cases, Seema's rank from the top is 6. Hence, each statement alone is sufficient to answer the question.

• Blue covers: R, Q, T
• Old books: All except S and U (i.e., P, Q, R, T, V)
• Gazetteers: All except P, R, S (i.e., Q, T, U, V)

Combining these:

• Old Gazetteers with blue covers are Q and T.

Thus, option (C) Q and T is correct.

Original Alphabet Groups: ABCD EFGH IJKL MNOP QRST UVWX YZ

Reversed Groups as per the rule: DCBA HGFE LKJI PONM TSRQ XWVU ZY

Finding the 13th Letter: The sequence after reversal is: D, C, B, A, H, G, F, E, L, K, J, I, P, O, N, M, T, S, R, Q, X, W, V, U, Z, Y
The 13th letter is P.

Fourth Letter to the Right of P:
P is the 13th letter. Counting four letters to the right: O (14), N (15), M (16), T (17).
Hence, the fourth letter to the right of P is T.

Identifying the Pattern:

• 20 × 0.5 = 10
• 10 × 1 = 10
• 10 × 1.5 = 15
• 15 × 2 = 30
• 30 × 2.5 = 75
• 75 × 3 = 225

Thus, the next term X is 225.

The pattern follows:
11 = 7 + 4
19 = 11 + 8
35 = 19 + 16
67 = 35 + 32
So, the next number is 67 + 64 = 131.

Mapping from the codes:

DEAR → 7465:

D → 7

E → 4

A → 6

R → 5

LIFE → 8394:

L → 8

I → 3

F → 9

E → 4

Code for "IDEAL":

I → 3

D → 7

E → 4

A → 6

L → 8

Final Code: 37468.

K is just above T and just below R.

L is just above P and just below T 

So, L is placed 2nd from the bottom. 

Thus, the correct answer is L.

Statement (2) directly tells us the total cost in terms of the price of one shirt. Statement (1) only confirms that all shirts have the same price, but it doesn't provide the actual cost.

If you observe the pattern, then you can see 

2 × 2.5 = 5

5 × 2.5 = 12.5

12.5 × 2.5 = 31.25

31.25 × 2.5 =  78.125

78.125 × 2.5 = 195.3125

Hence, the correct answer is  31.25

Add all the numbers in the set:
302+152+132+122+112 = 820.
Divide the sum (820) by the number of elements in the set (5):
820÷5 = 164.

The total distance to be covered by the train = length of train + length of platform = 240 m + 360 m = 600 m.
Speed of the train = 72 km/h 

(72 x 1000)/ 3600 = 20 m/s

Time = Distance/ speed = 600/ 20 = 30 seconds

Work done by P and Q together in 1 day = 1/8

Work done by Q in 1 day = 1/12

So, work done by P in 1 day = 1/8 − 1/12 = 3 − 2 / 24 = 1/24

Thus, P can complete the work alone in 24 days.

Part filled by (A + B + C) in 3 minutes

= 3(1/30 + 1/20 + 1/10) = 3 ×  11/60 = 11/20 Part  filled by C in 3 minutes = 3/10 

∴ Required ratio = 3/10 × 20/11 = 6/11

Let x be the quantity sold at 18% profit. The rest, (1000−x), is sold at 8% profit. The overall profit is 14%.

Using the weighted average method: 

Simplifying: 

8000 - 8x + 18x = 14000

10x = 6000

X = 60

Thus, the quantity sold at 18% profit is 600 kg.

Let the ratio of water to milk be x : y

The cost of milk is Rs. 12 per litre, and water is free (cost = Rs. 0 per litre). The mixture is worth Rs. 8 per litre.

Using the allegation rule (a method used to calculate the ratio of two components when mixed to get a desired price):

Thus, the ratio of water to milk is 1 : 2.

Therefore, water must be mixed with milk in the ratio of 1 : 2.

Let the present ages of Haseena and Anushka be 4x and 3x respectively, as their age ratio is given as 4 : 3.

After 6 years, Haseena's age will be 26 years. So, we can set up the equation:

4x + 6 = 26
Solving for x:

4x = 26 − 6

4x = 20

 x = 5

Now, Anushka's present age is 3x:

3x = 3 × 5 = 15 years

Thus, Anushka's present age is 15 years.

There are 13 spades in a deck. The probability of drawing the first spade is 13/52

After drawing one spade, there are 12 spades left and 51 cards in total, so the probability of drawing a second spade is 12/51.

The total probability is 13/52 x  12/51 = 1/17.

The rate of interest is 5% (Option D).

Explanation: The simple interest (SI) formula is: 

SI = (P x R x T)/ 100

Where:

• P = 7000 (Principal)
• A = 7700 (Amount)
• T = 2 years

Step 1: Calculate SI:

SI = A − P = 7700 − 7000 = 700

Step 2: Substitute into the formula:

Thus, the rate is 5 %.

x³+y³ = (x + y) × (x² − xy + y²) 

Putting given values of x³+y³ and (x + y)

9 = 3 × ((x+y)² − 3xy)

  = 3 × (9 − 3xy) 

  = 27 − 9xy

9xy = 18

xy = 2

x⁴ + y⁴ = (x² + y²)² - 2x²y²

   = (x² + y²)² - 2*4                [Putting value of xy]

   = ((x + y)² - 2xy)² - 2*4       [Putting values of (x+y) and xy]

   = (9 - 4)² - 2*4 

   = 17

They are all the first letters of the numbers spelt in order.
O – One
T – Two
T – Three
F – Four
F – Five
S – Six
S – Seven
E – Eight
N – Nine
So the answer is N

Short cut formula: The total number of person =  Position of Ganesh from the right ends + Position of Ganesh from the left ends – 1
Now, Position of Ganesh from the right ends = The total number of person – Position of Ganesh from the left ends + 1
= 60 – 26 + 1 = 35.
Hence, Ganesh is 35th from the right ends.
 

Angle traced by hour hand in 12 hrs  =360^∘
Angle traced by hour hand in 5 hrs 10 min. i.e.,

For any multiple independent event, there are n^m

total possible outcomes, where n is the number of outcomes per event, and m is the number of such events.

So for a coin, discounting the unlikely event of landing on its side, there are two possible outcomes per event, heads or tails. And it is stated that there are 3 such events. So n^m=2³=8

.

Total Distance = 10 +12 = 22 km
Total time = 10/12 + 12/10 = 5/6 + 6/5 = 25/30 + 36/30 = 61/30 hours
Average speed = 22 /(61/30) = 660/61 = 10.8 km/ hour

Let the ages of children be x, (x + 3), (x + 6), (x + 9) and (x + 12) years.
Then, x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 50
 5x = 20
x = 4.
Age of the youngest child = x = 4 years.

The three white flags can be arranged in the following two ways:
__ W __ W __ W or W __ W __ W __
In the blanks, the 2 blue and one red flag can be arranged in 3 ways.
So, the total number of arrangements is 2*3 = 6

20% of a = b  => (20/100)a = b
b% of 20 =(b/100) x 20 = (20a/100) x (1/100) x (20) = 4a/100 = 4% of a.

Let's assume the original two - digit number is represented by "AB," where A represents the tens digit and B represents the units digit.
According to the given in formation, we know that the number obtained by interchanging the two digits is less th the original number by 18.
This can be represented by the equation : (10A+B)−(10B+A)=18
Simplifying this equation, we get : 10A+B−10 B−A=18
9A−9B=18
A−B=2 (dividing both sides by 9 )
We also know that the sum of the two digits is 16 :
A+B=16
Now we have a system of equations :
A−B=2A+B=16​
Solving these equations simultaneously will give us the values of A and B. Adding the two equations, we get :
2A=18⇒A=9
Substituting the value of B back into one of the equations, we find: 9+B=16⇒B=7
Therefore, the original number is 97 .

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