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Latest IOCL JE Computer Science and IT Exam Question (Objective Questions), MCQ in English

Subjects : Domain Knowledge, Quantitative Aptitude, Logical Reasoning, English Language

Question Bank IOCL Junior Engineer (Computer Science and IT) Exam - English
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Domain Knowledge

Question 1Single Answer
The determinant of an upper triangular matrix is equal to:
  1. A
    Product of diagonal elements
  2. B
    Sum of diagonal elements
  3. C
    Product of non-diagonal elements
  4. D
    Zero
Question 2Single Answer
The sum of the eigenvalues of a square matrix is equal to its:
  1. A
    Rank
  2. B
    Determinant
  3. C
    Trace
  4. D
    Nullity
Question 3Single Answer
A square matrix \(A\) is invertible when:
  1. A
    \(\det(A)=0\)
  2. B
    Its rank is zero
  3. C
    Its trace is zero
  4. D
    \(\det(A)\neq 0\)
Question 4Single Answer
For an \(m \times n\) matrix \(A\), the rank-nullity theorem states:
  1. A
    Rank + Nullity = \(n\)
  2. B
    Rank × Nullity = \(n\)
  3. C
    Rank + Nullity = \(m\)
  4. D
    Rank − Nullity = \(n\)
Question 5Single Answer
All eigenvalues of a real symmetric matrix are:
  1. A
    Purely imaginary
  2. B
    Positive
  3. C
    Zero
  4. D
    Real
Question 6Single Answer
If \(Q\) is an orthogonal matrix, then:
  1. A
    \(Q^{-1}=Q\)
  2. B
    \(Q^{-1}=-Q\)
  3. C
    \(Q^{-1}=Q^T\)
  4. D
    \(Q^T=0\)
Question 7Single Answer
Two nonzero vectors are orthogonal when their dot product is:
  1. A
    1
  2. B
    Zero
  3. C
    −1
  4. D
    Infinity
Question 8Single Answer
Interchanging two rows of a determinant:
  1. A
    Leaves it unchanged
  2. B
    Changes its sign
  3. C
    Doubles its value
  4. D
    Makes it zero
Question 9Single Answer
The possible eigenvalues of an idempotent matrix are:
  1. A
    0 and −1
  2. B
    −1 and 1
  3. C
    0 and 1
  4. D
    Any real numbers
Question 10Single Answer
The rank of an \(n \times n\) identity matrix is:
  1. A
    0
  2. B
    1
  3. C
    \(n\)
  4. D
    \(n-1\)
Question 11Single Answer
The derivative of \(\ln x\) is:
  1. A
    \(1/x\)
  2. B
    \(x\)
  3. C
    \(e^x\)
  4. D
    \(\ln x/x\)
Question 12Single Answer
The indefinite integral of \(e^x\) is:
  1. A
    \(xe^x+C\)
  2. B
    \(e^{x+1}+C\)
  3. C
    \(e^x+C\)
  4. D
    \(1/e^x+C\)
Question 13Single Answer
The value of \(\lim_{x\to 0}\frac{\sin x}{x}\) is:
  1. A
    1
  2. B
    0
  3. C
    Infinity
  4. D
    −1
Question 14Single Answer
If \(f(x,y)=x^2y\), then \(\partial f/\partial x\) is:
  1. A
    \(x^2\)
  2. B
    \(xy^2\)
  3. C
    \(2x^2y\)
  4. D
    \(2xy\)
Question 15Single Answer
The second derivative of \(x^3\) is:
  1. A
    \(3x^2\)
  2. B
    6
  3. C
    \(6x\)
  4. D
    \(x\)
Question 16Single Answer
At an interior local maximum of a differentiable single-variable function:
  1. A
    \(f''(x)=0\) is always necessary
  2. B
    \(f'(x)=1\)
  3. C
    \(f'(x)=0\) is a necessary condition
  4. D
    The function must be discontinuous
Question 17Single Answer
The gradient vector points in the direction of:
  1. A
    Maximum decrease
  2. B
    Maximum increase
  3. C
    Zero curvature
  4. D
    Constant function value
Question 18Single Answer
The divergence of a constant vector field is:
  1. A
    1
  2. B
    Zero
  3. C
    −1
  4. D
    Infinity
Question 19Single Answer
The value of \(\int_0^1x^2dx\) is:
  1. A
    \(1/2\)
  2. B
    1
  3. C
    \(1/3\)
  4. D
    2
Question 20Single Answer
An infinite geometric series with common ratio \(r\) converges when:
  1. A
    \(r>1\)
  2. B
    \(r=1\)
  3. C
    \(|r|<1\)
  4. D
    \(|r|>1\)
Question 21Single Answer
The sequence \(1/n\) converges to:
  1. A
    Zero
  2. B
    Infinity
  3. C
    1
  4. D
    −1
Question 22Single Answer
The general solution of \(\frac{dy}{dx}=ky\) is:
  1. A
    \(y=C+kx\)
  2. B
    \(y=Ce^{kx}\)
  3. C
    \(y=Cx^k\)
  4. D
    \(y=C/kx\)
Question 23Single Answer
The Laplace transform of the constant function 1 is:
  1. A
    \(s\)
  2. B
    \(1/s^2\)
  3. C
    \(1/s\)
  4. D
    \(e^{-s}\)
Question 24Single Answer
The Newton–Raphson iteration formula is:
  1. A
    \(x_{n+1}=x_n+f(x_n)\)
  2. B
    \(x_{n+1}=f'(x_n)\)
  3. C
    \(x_{n+1}=x_n-\frac{f(x_n)}{f'(x_n)}\)
  4. D
    \(x_{n+1}=x_n/2\)
Question 25Single Answer
According to De Morgan’s law, \(\neg(P\land Q)\) is equivalent to:
  1. A
    \(\neg P\land\neg Q\)
  2. B
    \(P\land\neg Q\)
  3. C
    \(P\lor Q\)
  4. D
    \(\neg P\lor\neg Q\)
Question 26Single Answer
The implication \(P\rightarrow Q\) is logically equivalent to:
  1. A
    \(P\land Q\)
  2. B
    \(P\lor\neg Q\)
  3. C
    \(\neg P\lor Q\)
  4. D
    \(\neg P\land Q\)
Question 27Single Answer
Which of the following is a tautology?
  1. A
    \(P\lor\neg P\)
  2. B
    \(P\land\neg P\)
  3. C
    \(P\land Q\)
  4. D
    \(\neg(P\lor\neg P)\)
Question 28Single Answer
The contrapositive of \(P\rightarrow Q\) is:
  1. A
    \(Q\rightarrow P\)
  2. B
    \(\neg Q\rightarrow\neg P\)
  3. C
    \(\neg P\rightarrow\neg Q\)
  4. D
    \(P\rightarrow\neg Q\)
Question 29Single Answer
A set containing \(n\) elements has how many subsets?
  1. A
    \(2^n\)
  2. B
    \(2n\)
  3. C
    \(n^2\)
  4. D
    \(n!\)
Question 30Single Answer
An equivalence relation is:
  1. A
    Irreflexive and transitive
  2. B
    Reflexive, antisymmetric and transitive
  3. C
    Symmetric and antisymmetric only
  4. D
    Reflexive, symmetric and transitive
Question 31Single Answer
A partial-order relation is:
  1. A
    Reflexive, antisymmetric and transitive
  2. B
    Reflexive, symmetric and transitive
  3. C
    Irreflexive, symmetric and transitive
  4. D
    Symmetric and total
Question 32Single Answer
If 11 objects are placed in 10 boxes, then at least one box contains:
  1. A
    At least two objects
  2. B
    Exactly one object
  3. C
    No object
  4. D
    All 11 objects
Question 33Single Answer
The number of edges in a complete graph \(K_n\) is:
  1. A
    \(n(n-1)/2\)
  2. B
    \(n(n-1)\)
  3. C
    \(n^2\)
  4. D
    \(n+1\)
Question 34Single Answer
A tree with \(n\) vertices contains:
  1. A
    \(n\) edges
  2. B
    \(n+1\) edges
  3. C
    \(n-1\) edges
  4. D
    \(2n\) edges
Question 35Single Answer
A connected undirected graph has an Euler circuit if:
  1. A
    Every vertex has odd degree
  2. B
    Exactly two vertices have odd degree
  3. C
    Every vertex has even degree
  4. D
    It is complete
Question 36Single Answer
An undirected graph is bipartite if and only if it contains:
  1. A
    No odd cycle
  2. B
    No even cycle
  3. C
    No vertices of odd degree
  4. D
    Exactly one cycle
Question 37Single Answer
The shortest paths from a source in an unweighted graph can be found using:
  1. A
    DFS
  2. B
    Kruskal’s algorithm
  3. C
    Prim’s algorithm
  4. D
    BFS
Question 38Single Answer
A simple planar graph with \(n\geq 3\) vertices has at most:
  1. A
    \(3n-6\) edges
  2. B
    \(2n\) edges
  3. C
    \(n-1\) edges
  4. D
    \(n^2\) edges
Question 39Single Answer
The chromatic number of a nonempty bipartite graph containing at least one edge is:
  1. A
    2
  2. B
    1
  3. C
    3
  4. D
    4
Question 40Single Answer
The number of ways to select \(r\) objects from \(n\) distinct objects is:
  1. A
    \(\binom{n}{r}\)
  2. B
    \(n^r\)
  3. C
    \(n!\)
  4. D
    \(r!\)
Question 41Single Answer
The number of permutations of \(n\) distinct objects is:
  1. A
    \(n!\)
  2. B
    \(2^n\)
  3. C
    \(n^2\)
  4. D
    \(n(n-1)/2\)
Question 42Single Answer
For two finite sets \(A\) and \(B\):
  1. A
    \(|A\cup B|=|A|+|B|\) always
  2. B
    \(|A\cup B|=|A|+|B|-|A\cap B|\)
  3. C
    \(|A\cup B|=|A\cap B|\)
  4. D
    \(|A\cup B|=|A|-|B|\)
Question 43Single Answer
The Fibonacci recurrence is:
  1. A
    \(F_n=F_{n-1}-F_{n-2}\)
  2. B
    \(F_n=2F_{n-1}\)
  3. C
    \(F_n=F_{n-1}+F_{n-2}\)
  4. D
    \(F_n=nF_{n-1}\)
Question 44Single Answer
The ordinary generating function for the sequence \(1,1,1,\ldots\) is:
  1. A
    \(1+x\)
  2. B
    \(1/(1-x)\)
  3. C
    \(1/(1+x)\)
  4. D
    \(e^x\)
Question 45Single Answer
For any event \(A\), \(P(A^c)\) equals:
  1. A
    \(1-P(A)\)
  2. B
    \(1+P(A)\)
  3. C
    \(P(A)\)
  4. D
    \(1/P(A)\)
Question 46Single Answer
Events \(A\) and \(B\) are independent if:
  1. A
    \(P(A\cap B)=0\)
  2. B
    \(P(A\cup B)=1\)
  3. C
    \(P(A)=P(B)\)
  4. D
    \(P(A\cap B)=P(A)P(B)\)
Question 47Single Answer
Conditional probability \(P(A\mid B)\), where \(P(B)>0\), is:
  1. A
    \(P(A)/P(B)\)
  2. B
    \(P(A\cup B)/P(B)\)
  3. C
    \(P(A\cap B)/P(B)\)
  4. D
    \(P(B)/P(A)\)
Question 48Single Answer
Bayes’ theorem is primarily used to:
  1. A
    Calculate derivatives
  2. B
    Reverse conditional probabilities
  3. C
    Find graph connectivity
  4. D
    Solve matrix equations
Question 49Single Answer
The expected value of a Bernoulli random variable with success probability \(p\) is:
  1. A
    \(1-p\)
  2. B
    \(p^2\)
  3. C
    \(p\)
  4. D
    \(1/p\)
Question 50Single Answer
The variance of a Bernoulli random variable is:
  1. A
    \(p^2\)
  2. B
    \(p/(1-p)\)
  3. C
    \(1-p\)
  4. D
    \(p(1-p)\)
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