Information Retrival Techniques Set 4

Computer Science Engineering (CSE)

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This set of Information Retrival Techniques Multiple Choice Questions & Answers (MCQs) focuses on Information Retrival Techniques Set 4

Q1 | The purpose of fisher.test() is                test for contingency table.
  • chisq
  • fisher
  • prop
  • stem
Answer: fisher
Explaination:
prop.test() is used to inference for 1 proportion using normal approx.
Q2 | Which of the following is not a source used in Mid Infrared Spectrophotometer?
  • nernst glower
  • high pressure mercury arc lamp
  • globar
  • nichrome wire
Answer: high pressure mercury arc lamp
Explaination:
high pressure mercury arc lamp is used as the source for far ir spectrophotometer. rest of the options are used as a source in mid infrared spectrophotometer.
Q3 | Which of the following is the wave number of near infrared spectrometer?
  • 4000 – 200 cm-1
  • 200 – 10 cm-1
  • 12500 – 4000 cm-1
  • 50 – 1000 cm-1
Answer: 12500 – 4000 cm-1
Explaination:
the wave number of near infrared spectrometer ranges between 12500 – 4000. wavenumber is the reciprocal of wavelength.
Q4 | Which of the following options are correct in terms of wavelength for the different types of IR spectrometer?
  • near ir: 0.8 – 2.5 mm
  • mid ir: 0.8 – 2.5 mm
  • far ir: 2.5 – 50 mm
  • mid ir: 50 – 100 mm
Answer: near ir: 0.8 – 2.5 mm
Explaination:
wavelength of near ir is 0.8 –
Q5 | Which of the following is not a composition of Nernst glower or Nernst filament?
  • oxides of zirconium
  • oxides of barium
  • oxides of yitrium
  • oxides of thorium
Answer: oxides of barium
Explaination:
oxides of barium is not present in nernst glower. they are constructed by fusing oxides of zirconium, yitrium and thorium.
Q6 | Bolometer, a type of detector, is also known as                        
  • resistance temperature detector (rtd)
  • thermistor
  • thermocouple
  • golay cell
Answer: thermistor
Explaination:
bolometers are also known as thermistors. it is a type of resistance thermometer constructed of metals such as platinum or nickel.
Q7 | Which of the following is not a technique for preparing solid samples in IR spectroscopy?
  • solids run in solution
  • mull technique
  • solid films
  • thin films
Answer: thin films
Explaination:
four techniques are generally used to prepare solid samples. they are: solids run in solution, mull technique, solid films and pressed pellet techniques.
Q8 | Which of the following is not used as pyroelectric material used in pyroelectric transducers in Infrared spectroscopy?
  • triglycine sulphate
  • deutrated triglycine sulphate
  • some polymers
  • tetraglycine sulphate
Answer: tetraglycine sulphate
Explaination:
pyroelectric materials are deutrated triglycine sulphate, triglycine sulphate and some polymers. they give rise to potential when subjected to a heating or cooling effect.
Q9 | spectroscopy?
  • expansion of gas upon heating
  • increase in resistance due to an increase in temperature and vice versa
  • temperature difference gives rise to a potential difference in the material
  • decrease in resistance due to an increase in temperature
Answer: expansion of gas upon heating
Explaination:
it is also known as pneumatic detector. the gases expand on heating and this in turn leads to the movement of a diaphragm just like in pneumatic sensors.
Q10 | In a solid sample treatment technique, the finely ground solid sample is mixed with mineral oil to make a thick paste which is then spread between IR transmitting windows. What is the name of this solid sample treatment technique?
  • pressed pellet
  • mull technique
  • solid films
  • solids run in solution
Answer: mull technique
Explaination:
the mentioned technique is mull technique. this method is used for qualitative analysis but not quantitative analysis.
Q11 | What is the definition of Boolean functions?
  • an arithmetic function with k degrees such that f:y–>yk
  • a special mathematical function with n degrees such that f:yn–>y
  • an algebraic function with n degrees such that f:xn–>x
  • a polynomial function with k degrees such that f:x2–>xn
Answer: a special mathematical function with n degrees such that f:yn–>y
Explaination:
a boolean function is a special mathematical function with n degrees and where y = {0,1} is the boolean domain with being a non-negative integer. it helps in describing the way in which the boolean output is derived from boolean inputs.
Q12 | F(X,Y,Z,M) = X`Y`Z`M`. The degree of the function is                  
  • 2
  • 5
  • 4
  • 1
Answer: 4
Explaination:
this is a function of degree 4 from the set of ordered pairs of boolean variables to the set {0,1}.
Q13 | A                   value is represented by a
  • numerical logic
  • boolean algebra
  • arithmetic logic
  • boolean number
Answer: arithmetic logic
Explaination:
the variables that can have two discrete values false(0) and true(1) and the operations of logical significance are dealt with boolean algebra.
Q14 | Boolean expression.
  • positive
  • recursive
  • negative
  • boolean
Answer: boolean
Explaination:
a boolean value is given by a boolean expression which is formed by combining boolean variables and logical connectives.
Q15 | What are the canonical forms of Boolean Expressions?
  • or and xor
  • nor and xnor
  • max and min
  • som and pom
Answer: som and pom
Explaination:
there are two kinds of canonical forms for a boolean expression-> 1)sum of minterms(som) form and
Q16 | Which of the following is/are the universal logic gates?
  • or and nor
  • and
  • nand and nor
  • not
Answer: nand and nor
Explaination:
nand and nor gates are known as the universal logic gates. a universal gate is a gate which can implement any boolean function without the help of 3 basic gate types.
Q17 | The logic gate that provides high output for same inputs                          
  • not
  • x-nor
  • and
  • xor
Answer: x-nor
Explaination:
the logic gate which gives high output for the same inputs, otherwise low output is known as x-nor or exclusive nor gate.
Q18 | The                         of all the variables in direct or complemented from is a maxterm.
  • addition
  • product
  • moduler
  • subtraction
Answer: addition
Explaination:
the boolean function is expressed as a sum of the 1-minterms and the inverse of function is represented as 0- minterms.
Q19 | The quantity which has the only magnitude is called                          
  • a scalar quantity
  • a vector quantity
  • a chemical quantity
  • a magnitude quantity
Answer: a scalar quantity
Explaination:
a quantity which has only magnitude and no direction is called scalar quantity. example: mass
Q20 | A polar vector is one which?
  • gives the position of an object
  • tells how much and in which direction an object has changed its position
  • represents rotational effect
  • has a starting point of application
Answer: has a starting point of application
Explaination:
the vector which has a starting point or a point of application is called a polar
Q21 | Which of the following acts in accordance with right hand screw rule?
  • polar vector
  • axial vector
  • displacement vector
  • position vector
Answer: axial vector
Explaination:
the vectors which represent rotational effect and act along the axis of rotation in accordance with right hand screw rule are called axial vector. axial vector will have its direction along its axis of rotation depending on its anticlockwise or clockwise rotational effect.
Q22 | What is the magnitude of a unit vector?
  • it has no magnitude
  • zero
  • constant but not zero
  • unity
Answer: unity
Explaination:
the magnitude of a unit vector is unity. it just gives the direction of a vector. a unit vector has no units or dimensions.
Q23 | Which of the following has zero magnitude?
  • fixed vector
  • zero vector
  • modulus of a vector
  • unit vector
Answer: zero vector
Explaination:
a zero or null vector is a vector that has zero magnitude and an arbitrary direction. the velocity vector of a stationary object is a zero vector.
Q24 | Flying a bird is an example of                          
  • collinear vector
  • multiplication of vector
  • addition of vector
  • composition of vector
Answer: composition of vector
Explaination:
when a bird flies, it pushes the air with force in the downward direction with its wings. in accordance with newton’s law of motion, the air exerts equal and opposite
Q25 | Two forces whose magnitudes are in ratio of 3:5 give a resultant of 35N. If the angle of inclination is 60°, calculate the magnitude of each force.
  • 15n and35n
  • 15n and 25n
  • 10n and 15n
  • 20n and 5n
Answer: 15n and 25n
Explaination:
p = 3x and q = 5x r = 35n θ = 120°
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