Matlab Multiple Choice Questions And Answers

21.The?following?lines?show?collections?of?characters?(e.g.,?_xm,?m3)??that?either?can?or?can?not?be?valid?names?of?MATLAB?variables.?Which?line?contains?EXCLUSIVELY?valid?names????
a.?_xm?m3,?abc,?a_B????(wrong,?but?accepted?in?Quiz?1?->?“?_?“?not?allowed?as?1st?char?of?var.?name)?
b.? m3,?3_m,?m_3,?aB??
c.? AA,?for,?a-b,?ab?
d.? AA,?BB,?m3,?a-B?
e.? none?of?above?  Ans: a


22.?Which?of?the?following?statements?is?correct?? 
a.? Function?“clear”?clears?only?the?scalar?variables,?but?does?not?clear?arrays?
b.? Function?“clc”?clears?all?variables?
c.? Function?“clc”?clears?only?constants?
d.? Function?“clear?a”?clears?all?variables?of?the?type?“array”?
e.? None?of?the?above?
Ans: e
?
23.?Executing?in?the?Command?Window?the?following?code?
? A?=?eye(1,10)?;??size(A(2,2))?
? returns??
a.? 1?
b.? 0?
c.? error?message?
d.? 1????1?
e.? none?of?the?above?
Ans: c

24.?Executing?in?the?Command?Window?the?following?code?
? A?=?[1:1:5;;2:1:6]?;??size(A)?
? returns??
a.? 2????5?
b.? 5????2?
c.? error?message?
d.? 3????5?
e.? none?of?the?above?  Ans: a
25.?Executing?the?command?iskeyword sin returns 0,?i.e.,?sin?is?not?a?MATLAB?keyword. Given?this?information,?which?of?the?following?statements?shows?the?result?of?executing,?in?the?Command?Window,?of?the?line???
sqrt(sin(-pi/2))??;??sin?=?size(1:5)?
a.? wrong?result?(i.e.,?at?least?one?of?the?commands?should?not?be?used)?
b.? 1?
c.? 1????5?
d.? i?
e.? none?of?above?
Ans: c

26.?Which?of?the?following?statements?is?correct?? 
a.? Function?“who”?returns?the?name?of?the?currently?logged?user?
b.? Function?“who”?returns?the?name?of?the?system?administrator?
c.? Function?“whos”?displays?the?user?IDs?for?all?accounts?on?the?computer?
d.? Function?“who”?displays?the?web?address?of?the?system?administrator?
e.? None?of?the?above?
Ans: e

27.?After?executing?the?following?script?file?in?MATLAB??
x?=?[2:4?;?-1:1?;?1?2?3];?
y=x(2,:);?
size(y')?
the?displayed?result?is??
a.? 2????2??
b.? 3????1?
c.? 2????1?
d.? 1????3?
e.? none?of?above?  Ans: b

28.?After?executing?the?following?script?file?in?MATLAB?
x?=?3i;?
y?=?x/2*sqrt(-1);?
z?=?x?+?y?
the?displayed?result?is?
a.? 1.5?+?3?i?
b.? error?message??
c.? 3?+?1.5?i?
d.? -1.5?+?3?i?
e.? none?of?above?
Ans: d

29.?After?executing?the?following?script?file?in?MATLAB??
x?=?-i;?
y?=?x*sqrt(-1);?
x?+?y?
the?displayed?result?is?
a.? error?message?
b.? -i??
c.? ?i?
d.? 1?-?1?i?
e.? none?of?above??
Ans: d

30.?Executing?in?the?Command?Window?the?following?code?
? ??y?=?a?+?b?,?a?=?2?;?b?=?sqrt(-4)?;?
? returns?
?
a.? 2?+?2?i?
b.? 2?-?2?i?
c.? error?message?
d.? NaN?
e.? none?of?the?above?
Ans: c

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