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?
Rate of A = 121, Rate of B = 151. Combined rate = 121 + 151 = 605 + 604 = 609 = 203. Time = 320 = 6.67 hours
If A:B = 3:4 and B:C = 5:6, what is A:B:C?
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
Find the odd one out: 15, 20, 25, 30, 35, 40, 45, 55
All numbers except 55 are multiples of 5 with a difference of 5. The difference before 55 is 10 instead of 5
MORNING is to NIGHT as SPRING is to ?
Morning and Night are opposites. Spring and Winter are opposite seasons
If you rearrange the letters of 'STOP', you can make another word. Which word cannot be made?
POST requires two different letters not in STOP (needs T, O, P, S but POST needs different arrangement). All others are valid anagrams
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What should come next in the series? A, B, D, G, K, ?
Pattern: A(0), B(+1)=1, D(+2)=3, G(+3)=6, K(+4)=10, P(+5)=15. Each gap increases by 1
Statements: Some cats are dogs. All dogs are animals. Conclusion: Some cats are animals. Is this conclusion valid?
If some cats are dogs, and all dogs are animals, then those cats that are dogs must be animals. Therefore, some cats are animals is valid
Select the word that best completes: 'Plagiarism is to writing as _____ is to music.'
Plagiarism is unethical copying in writing. It maintains the same meaning when applied to music
Which sentence is grammatically correct?
'Each' is singular, so 'has' is correct. 'Their assignment' (singular) matches with 'each'
Find the synonym of 'EPHEMERAL':
'Ephemeral' means lasting for a very short time. 'Transient' is the closest synonym
Choose the antonym of 'VERBOSE':
'Verbose' means using or containing more words than necessary. 'Concise' is the opposite
In Java, what does 'final' keyword do when applied to a variable?
'final' keyword makes a variable immutable - once assigned, it cannot be changed
What is the purpose of an index in a database?
An index is a database structure that improves the speed of data retrieval by creating a quick lookup mechanism
What is polymorphism in OOP?
Polymorphism allows objects to take multiple forms - same method name can behave differently in different contexts (method overriding, overloading)
Which of the following is NOT a characteristic of Cloud Computing?
Cloud computing is characterized by remote resources, not physical hardware on-premises. All others are cloud characteristics
What is the primary difference between ArrayList and LinkedList in Java?
ArrayList uses arrays (O(1) random access) while LinkedList uses nodes (O(n) random access but O(1) insertion/deletion at ends)
What is normalization in database design?
Normalization is the process of organizing data to reduce redundancy and dependency, improving database integrity
What is the main purpose of agile methodology in software development?
Agile methodology emphasizes iterative development, continuous feedback, and adaptability rather than fixed lengthy development cycles
In the context of cybersecurity, what is a firewall?
A firewall is a security barrier that filters network traffic based on predetermined rules to protect systems from unauthorized access
If the probability of an event A is 0.4 and event B is 0.3, what is the probability of both A and B occurring (assuming independence)?
For independent events: P(A and B) = P(A) × P(B) = 0.4 × 0.3 = 0.12
