A TCS developer encounters a null pointer exception in Java. What is the PRIMARY cause?

The correct answer is A: Accessing or invoking methods on an object reference that points to null. NullPointerException occurs when trying to call methods or access properties on a null object reference, which has no actual instance allocated in memory.

A candidate is solving a problem on dynamic programming for the Infosys coding round. The problem involves overlapping subproblems and optimal substructure. What is the minimum number of steps to solve such problems?

The correct answer is C: 3 steps - define subproblems, find recurrence, implement with memoization/tabulation. Dynamic programming requires defining subproblems, establishing recurrence relations, and implementing solutions using memoization or tabulation for optimization.

What is the HCF of 48 and 64?

The correct answer is C: 16. 48 = 2⁴×3, 64 = 2⁶. HCF = 2⁴ = 16

What is the missing number in this sequence: 5, 10, 20, 40, ?

The correct answer is D: 80. Each number is multiplied by 2. 5×2=10, 10×2=20, 20×2=40, 40×2=80

In OOP, what is inheritance?

The correct answer is B: A class acquiring properties of another class. Inheritance allows a class to inherit properties and methods from another class (parent/base class)

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Placement Papers

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All TCS Questions 100 Capgemini Questions 55 IBM Questions 50 Infosys Questions 100 Wipro Questions 100 Accenture Questions 55 Cognizant Questions 50 HCL Questions 50 Amazon Questions 50 Google Questions 44

Q.101 Medium IBM Questions IBM

Find the odd one out: 15, 20, 25, 30, 35, 40, 45, 55

A 20

B 55

C 35

D 15

Correct Answer: B. 55

EXPLANATION

All numbers except 55 are multiples of 5 with a difference of 5. The difference before 55 is 10 instead of 5

Test

Q.102 Medium IBM Questions IBM

If A:B = 3:4 and B:C = 5:6, what is A:B:C?

A 15:20:24

B 3:4:5

C 3:5:6

D 12:16:20

Correct Answer: A. 15:20:24

EXPLANATION

A:B = 3:4 (multiply by 5) = 15:20. B:C = 5:6 (multiply by 4) = 20:24. So A:B:C = 15:20:24

Test

Q.103 Medium IBM Questions IBM

Two pipes A and B can fill a tank in 12 hours and 15 hours respectively. If both pipes are opened together, how long will it take to fill the tank?

A 6.67 hours

B 6 hours

C 7.5 hours

D 8 hours

Correct Answer: A. 6.67 hours

EXPLANATION

Rate of A = 1/12, Rate of B = 1/15. Combined rate = 1/12 + 1/15 = 5/60 + 4/60 = 9/60 = 3/20. Time = 20/3 = 6.67 hours

Test

Q.104 Medium Capgemini Questions Capgemini

What is the GCD of 24 and 36?

A 6

B 8

C 12

D 24

Correct Answer: C. 12

EXPLANATION

Factors of 24: 1,2,3,4,6,8,12,24. Factors of 36: 1,2,3,4,6,9,12,18,36. GCD = 12

Test

Q.105 Medium Capgemini Questions Capgemini

Two numbers are in the ratio 3:4. If their sum is 70, what are the numbers?

A 30, 40

B 35, 35

C 20, 50

D 25, 45

Correct Answer: A. 30, 40

EXPLANATION

Let numbers be 3x and 4x. 3x + 4x = 70. 7x = 70. x = 10. Numbers are 30 and 40

Test

Q.106 Medium Capgemini Questions Capgemini

If 30% of a number is 45, what is the number?

A 100

B 120

C 150

D 180

Correct Answer: C. 150

EXPLANATION

Let number = x. 30% of x = 45. 0.30x = 45. x = 45/0.30 = 150

Test

Q.107 Medium Capgemini Questions Capgemini

In CSS, what does the 'z-index' property control?

A Font size

B Text alignment

C Stacking order of elements

D Background color

Correct Answer: C. Stacking order of elements

EXPLANATION

z-index controls the stacking order of overlapping elements on a webpage

Test

Q.108 Medium Capgemini Questions Capgemini

What is the main difference between ArrayList and LinkedList in Java?

A ArrayList is faster for random access

B LinkedList is faster for random access

C Both have same performance

D ArrayList uses more memory

Correct Answer: A. ArrayList is faster for random access

EXPLANATION

ArrayList provides O(1) random access, while LinkedList provides O(n) access

Test

Q.109 Medium Capgemini Questions Capgemini

In Java, which keyword is used to prevent inheritance?

A private

B protected

C final

D static

Correct Answer: C. final

EXPLANATION

The 'final' keyword prevents a class from being subclassed or inherited

Test

Q.110 Medium Capgemini Questions Capgemini

Identify the error in: 'The team were playing good football yesterday.'

A were playing

B good football

C yesterday

D No error

Correct Answer: B. good football

EXPLANATION

'Good' should be 'well' when describing how something is done (adverb usage)

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