Commands MCQ

Test your knowledge with important Commands MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Commands MCQs at Bissoy

• Which command is used for displaying date in the format dd/mm/yyyy ?
  ক

  date +%m

  খ

  date +%h

  গ

  date +”%d/%m/%Y”

  ঘ

  date +”%h %m”
• What are meta-characters?
  ক

  special characters having predefined meaning to the shell

  খ

  special symbols

  গ

  shell symbols

  ঘ

  command symbols
• What is the output of who command?
  ক

  display information about users who are currently logged in.

  খ

  display file hierarchy

  গ

  display administrator information

  ঘ

  display processes
• Which command is used for displaying date and calendar in UNIX?
  ক

  date and cal

  খ

  DATE and CAL

  গ

  date and calendar

  ঘ

  dt and cl
• How can we specify more than one command in the command line at the same time?
  ক

  using ;

  খ

  using >

  গ

  using ==

  ঘ

  not possible
• Which of the following is not a valid option of uname?
  ক

  -a

  খ

  -s

  গ

  -v

  ঘ

  -z
• Options are also arguments but begin with a -.
  ক

  True

  খ

  False
• The sequences of directories that a shell searches while looking for a command is specified in the PATH variable.
  ক

  True

  খ

  False
• Which command is used for extracting the details of the operating system?
  ক

  cd

  খ

  echo

  গ

  uname

  ঘ

  wc
• In how many categories, commands of UNIX operating system classified?
  ক

  1

  খ

  2

  গ

  Many

  ঘ

  0
• What are Commands?
  ক

  specific instructions for performing a particular task

  খ

  part of the operating system

  গ

  part of the shell

  ঘ

  special instructions
• Which of the following will add the title “R language” to the graph?
  ক

  titleAdd( “R language”)

  খ

  title( “R language”)

  গ

  titleBar( “R language”)

  ঘ

  var(x, na.rm=TRUE)
• Which of the following function is used for plotting histogram?
  ক

  hist()

  খ

  histog()

  গ

  histg()

  ঘ

  histo()
• Which of the following sets the size of the outer margins for the graph?
  ক

  par(mfrow=c(nrow,mcol))

  খ

  par(ask=TRUE)

  গ

  par(omi=c(0,0,1,0) )

  ঘ

  par(ask=False)
• Which of the following may be used for linear regression?
  ক

  X %*% Y

  খ

  solve(A)

  গ

  solve(A,B)

  ঘ

  X $*$ Y
• which of the following statement tells the row with the minimum value for every column?
  ক

  which.min(x)

  খ

  which.max(x)

  গ

  z=apply(x,1,which.min)

  ঘ

  z=apply(1,1,which.max)
• Which of the following statement finds the maximum for each column?
  ক

  apply(x,2,max)

  খ

  col.max(x)

  গ

  which.min(x)

  ঘ

  which.max(x)
• Which of the following statement applies the function (FUN) to either rows (1) or columns (2) on object X?
  ক

  apply(x,1,min)

  খ

  apply(x,2,max)

  গ

  col.max(x)

  ঘ

  apply(X, MARGIN, FUN, …)
• Which of the following finds row sums for each level of a grouping variable?
  ক

  rowSums (x, na.rm = FALSE, dims = 1)

  খ

  colMeans(x, na.rm = FALSE, dims = 1)

  গ

  rowMeans(x, na.rm = FALSE, dims = 1)

  ঘ

  rowsum(x, group, reorder = TRUE, …)
• Which of the following will reverse the order of values in x?
  ক

  rev(x)

  খ

  max(x, na.rm=TRUE)

  গ

  all(x)

  ঘ

  x%in%y
• Which of the following produces the variance covariance matrix?
  ক

  sd(x, na.rm=TRUE)

  খ

  mad(x, na.rm=TRUE)

  গ

  fivenum(x, na.rm=TRUE)

  ঘ

  var(x, na.rm=TRUE)
• Which of the following finds the maximum value in the vector x, exclude missing values?
  ক

  rm(x)

  খ

  max(x, na.rm=TRUE)

  গ

  all(x)

  ঘ

  x%in%y
• Which of the following tests each element of x for membership in y?
  ক

  y%in%x

  খ

  all(x)

  গ

  any(x)

  ঘ

  x%in%y
• Which of the following truncates real x to integers?
  ক

  as.order(x)

  খ

  as.integer(x)

  গ

  as.numeric(x)

  ঘ

  as.character(x)
• Which of the following is uniform distribution?
  ক

  dunif(x, min=0, max=1, log = FALSE)

  খ

  punif(q, min=0, max=1, lower.tail = TRUE, log.p = FALSE)

  গ

  qunif(p, min=0, max=1, lower.tail = TRUE, log.p = FALSE)

  ঘ

  runif(n, min=0, max=1)
• which of the following statement gives cumulative sum?
  ক

  cumsum(x,na=rm=TRUE)

  খ

  cumprod(x)

  গ

  cummax(x)

  ঘ

  cummin(x)
• Which of the following statement is normal distribution?
  ক

  dnorm(x, mean=0, sd=1, log = FALSE)

  খ

  pnorm(q, mean=0, sd=1, lower.tail = TRUE, log.p = FALSE)

  গ

  qnorm(p, mean=0, sd=1, lower.tail = TRUE, log.p = FALSE)

  ঘ

  rnorm(n, mean=0, sd=1)
• Which of the following statement find cases with no missing values?
  ক

  complete <- subset(data.df,complete.cases(data.df)

  খ

  complete <- sub(data.df,complete.cases(data.df)

  গ

  complete <- subset(data.df,completeall.cases(data.df)

  ঘ

  new <- old[n1:n2,n3:n4
• Which of the following code drop the ith and jth column? b) new <- old c) new <- old d) new <- subset(old,logical)
  ক

  new <- old

  খ

  -n,

  গ

  -n,

  ঘ

  -n,
• Which of the following code will drop the nth column? b) new <- old c) new <- old d) new <- subset(old,logical)
  ক

  new <- old

  খ

  -n,

  গ

  -n,

  ঘ

  -n,