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Amazon Questions & Answers For Freshers (Aptitude, Reasoning &Technical Questions)
Number of Questions: 20 QuestionsAmazon Aptitude Questions & Answers
1. The efficiency of P is 25% more then Q and Q take 25 days to complete a piece of work. P started a work alone and then Q joined her 5 days before actual completion of the work. For how many days P worked alone?
A. 9
B. 10
C. 11
D. 12
Answer – C. 11
Explanation:
Efficiency (P: Q) = 5: 4
Number of days(P: Q) = 4x : 5x = 4x : 25
Therefore, Number of days required by P to finish the work alone = 4x
= 4 x 5 = 20.
P and Q work together for last 5 days = 5 x 9 = 45%
Efficiency of P = 5% and Q’s efficiency = 4%
Therefore, No. of days taken by P to complete 55% work = 55/5 = 11 days
2. A man borrows Rs 4000 at 8% compound interest for 3 years. At the end of each year, he paid Rs 500. How much amount should he pay at the end of the 3rd year to clear the debt?
A. Rs 3465.2
B. Rs 3485.2
C. Rs 4345.4
D. Rs 3915.6
Answer – D. Rs 3915.6
Explanation:
Amount after 1 yr = 4000[1 + 8/100] = 4320
Paid 500, so P = 4320 – 500 = 3820
Amount after 2nd yr = 3820[1 + 8/100] = 4125.6
So P= 4125.6-500 = 3625.6
Amount after 3rd yr = 3625.6[1 + 8/100] = 3915.6
3. If the ratio of Rate of filling of two Pipes A and B is 3:2. If together they can fill a Tank 5/6th of Tank in 20 minutes. Then in how many does A alone can fill the Tank?
A. 50 Minutes
B. 40 Minutes
C. 30 Minutes
D. 20 Minutes
Answer – B. 40 Minutes
Explanation:
5/6 tank = 20 Min
Full tank = 24 Min
1/2x+ 1/3x = 1/24
x = 20, A= 2x = 40 Min
4. A car covers first 10 km with 40km/hr next 10km with 60 km and next 10 km in 20 km/hr. What is the average speed of the car?
A. 320/11
B. 330/11
C. 350/11
D. 360/11
Answer – D. 360/11
Explanation:
Average speed = (3*20*40*60)/800+2400+1200 = 360/11
5. A cube of side one meter length is cut into small cubes of side 10 cm each. How many such small cubes can be obtained?
A. 10
B. 100
C. 1000
D. 10000
Answer – C. 1000
Explanation:
Along one edge, the number of small cubes that can be cut
= 100/10 = 10
Along each edge, 10 cubes can be cut.
Total number of small cubes that can be cut = 10 * 10 * 10 = 1000
6. M and N are invested in a business. They earned some profit which they divided in the ratio of 2:3. If M invested Rs.30000, the amount invested by N is
A. Rs.35,000
B. Rs.40,000
C. Rs.45,000
D. Rs.64,000
Answer – C. Rs.45,000
Explanation:
30,000: N = 2:3
N = 90,000/2 = 45,000
7. The parameter of a square is equal to the perimeter of a rectangle of length 16 cm and breadth 14 cm. Find the circumference of a semicircle whose diameter is equal to the side of the square. (Round off your answer to two decimal places)
A. 23.57 cm
B. 77.14 cm
C. 84.92 cm
D. 94.94 cm
Answer – A. 23.57 cm
Explanation:
Let the side of the square be a cm.
Parameter of the rectangle = 2(16 + 14) = 60 cm
Parameter of the square = 60 cm
i.e. 4a = 60
a = 15
Diameter of the semicircle = 15 cm
Circimference of the semicircle
= 1/2(∏)(15)
= 1/2(22/7)(15) = 330/14 = 23.57 cm to two decimal places
Amazon Logical Reasoning Questions & Answers
8. If Subbu finds that it is seventeenth from the right and eighteenth from the left in a line facing north. How many persons should be added to the line such that there are 40 people in the line?
A. 5
B. 6
C. 8
D. 9
Answer – B. 6
Explanation:
17 + Subbu + 16 + X = 40
X = 6
9. Choose the word which is different from the rest.
A. Rhea
B. Trout
C. Lamprey
D. Salmon
Answer – A. Rhea
Explanation:
All except Rhea are kinds of fishes.
10. FLOOD is written as 63664, How WATER is written in that code?
A. 51259
B. 23456
C. 23456
D. 15678
Answer – A. 51259
Explanation:
FLOOD => 6 3(1+2) 6(1+5) 6 4 = 63664
WATER => 5(2+3) 1 2(2+0) 5 9(1+8) = 51259
11. LONDON is written as MNPBRK, How MOSCOW is written in that code?
A. NMUBTR
B. NNUART
C. MMBVTR
D. NNAUTY
Answer – B. NNUART
Explanation:
L(+1)O(-1) N(+2)D(-2) O(+3)N(-3)
MN PB RK
Hence, M(+1)O(-1) S(+2)C(-2) O(+3)W(-3)
NN UA RT
12. Choose the word which is different from the rest.
A. Circle
B. Ellipse
C. Sphere
D. Cube
Answer – D. Cube
Explanation:
All except Cube are circular figures
13. Choose the word which is different from the rest.
A. Iron
B. Nickel
C. Aluminum
D. Cobalt
Answer – C. Aluminum
Explanation:
All except Aluminium all are magnetic materials.
Amazon Technical Questions & Answers
14. Which of the following applications may use a stack?
A. Parentheses balancing program
B. Tracking of local variables at run time
C. Compiler syntax analyzer
D. All of the mentioned
Answer – D. All of the mentioned
15. With what data structure can a priority queue be implemented?
A. Array
B. List
C. Heap
D. All of the mentioned
Answer – D. All of the mentioned
16. Which of the following is the function of the database administration?
A. Application checking
B. Database access planning
C. Computer applications management
D. All of these
Answer – B. Database access planning
17. Pushing an element into stack already having five elements and stack size of 5, then stack becomes
A. Underflow
B. User flow
C. Overflow
D. Crash
Answer – C. Overflow
18. Which is the predefined method available in Java to convert decimal to binary numbers?
A. Binary Integer
B. Binary Value
C. Binary Number
D. Binary String
Answer – D. Binary String
19. What is meant by physical size in a dynamic array?
A. The size allocated to elements
B. The size extended to add new elements
C. The size of the underlying array at the back-end
D. The size visible to users
Answer – C. The size of the underlying array at the back-end
20. Express 15 as a 6-bit signed binary number.
A. 001111
B. 001110
C. 101111
D. 101110
Answer – C. 101111