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GK One-Line Question & Answer

15541+ short questions with short answers, covering every category and sub-category on the site — no long articles to scroll through. Good for a fast recap before an exam, or a few minutes of daily practice.

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Data Structures and Algorithms → Introduction to DSA 16

The output of: int x=42; const int &cr=x; x=100; cout<<cr;
100
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The output of: const int x=5; int *p=const_cast<int*>(&x); *p=10; cout<<x;
5 (modifying const is UB)
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The output of: class A{public:void f()const{cout<<"const";}void f(){cout<<"non-const";}}; const A a; a.f();
const
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The output of: class A{public:void f()const{cout<<"C";}void f(){cout<<"N";}}; A a; a.f();
N
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The output of: int arr[5]; fill(arr,arr+5,7); cout<<arr[0]<<arr[4];
77
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The output of: vector<int> v={1,2,3}; v.assign(5,0); cout<<v.size()<<v[0];
50
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The output of: list<int> l={1,2,3,4,5}; l.remove(3); cout<<l.size();
4
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The output of: list<int> l={3,1,4,1,5}; l.sort(); l.unique(); cout<<l.size();
4
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The output of: vector<int> v={1,2,3,4,5}; auto r=remove_if(v.begin(),v.end(),[](int x){return x%2==0;}); v.erase(r,v.end()); cout<<v.size();
3
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The output of: forward_list<int> fl={1,2,3}; fl.push_front(0); cout<<fl.front();
0
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forward_list vs list in C++:
forward_list is singly-linked (no backward traversal, less memory)
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The output of: auto r=views::iota(1,6)|views::transform([](int x){return x*x;})|views::take(3); for(auto x:r)cout<<x<<" ";
1 4 9
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The output of: int n=2; while(n<=100){cout<<n<<" "; n*=2;}
2 4 8 16 32 64
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The output of: int arr[]={1,2,3,4,5}; int*p=arr+2; cout<<*(p-1)<<*p<<*(p+1);
234
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The output of: string s="Hello World"; istringstream iss(s); string word; vector<string> words; while(iss>>word)words.push_back(word); cout<<words.size()<<words[0];
2Hello
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C++ is best described as which type of programming language?
Compiled, statically-typed, multi-paradigm language supporting OOP, generic, and procedural programming
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Computer Fundamentals → Generations of Computer 12

Which vacuum tube was used in first generation computers?
Triode
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First generation computers used which programming language?
Machine Language
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Which generation of computers used transistors?
Second
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Transistors replaced vacuum tubes in which computer generation?
2nd
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Which generation introduced Integrated Circuits (ICs)?
Third
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The fourth generation of computers is characterized by?
Microprocessors
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Which generation of computers introduced VLSI technology?
Fourth
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Which language was developed for second generation computers?
Assembly Language
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Which of the following is NOT a first generation computer?
IBM 360
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Which generation of computers had batch processing operating systems?
Second
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The operating speed of first generation computers was measured in?
Milliseconds
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The operating speed of fourth generation computers is measured in?
Nanoseconds
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Computer Fundamentals → Introduction to Computer 11

ENIAC stands for?
Electronic Numerical Integrator and Computer
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Fifth generation computers are based on?
Artificial Intelligence
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UNIVAC was the first commercially available computer belonging to which generation?
First
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IBM 7094 belongs to which computer generation?
Second
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The size of computers decreased significantly due to?
Use of transistors
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Time-sharing was introduced in which computer generation?
Third
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Which company developed the first microprocessor Intel 4004?
Intel
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Nanosecond speed is associated with which computer generation?
Third
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Which generation introduced multiprogramming?
Third
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Magnetic core memory was used in which generation?
Second
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Punched cards as input are associated with which generation?
First and Second
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Computer Fundamentals → Memory Units 1

PARAM is a supercomputer developed by?
India
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