ETEA Per Engineering Papers

Q: sin(α+β)- sin(α-β)=

(a) :  2cosα sinβ
(b) :  2 sinβcosα
(c) :  2sinα sinβ
(d) :  (2sinα) sinβ-
(e) :  None
Answer:  (2sinα) sinβ-

Q: Baeyer's reagent os

(a) :  HCl + ZnCl₂
(b) :  H₂NNH₂
(c) :  Br₂ in CCl₄
(d) :  Dil k MnO4
(e) :  None
Answer:  HCl + ZnCl₂

Q: The magnification of a magnifying glass having focal length of 10cm for an object lying at a distance of 20cm is

(a) :  0.01
(b) :  10
(c) :  0.1
(d) :  1
(e) :  None
Answer:  0.01

Q: Which of the folloiwng is responsible for an increase in the entrop of a gaseous system?

(a) :  Increase in hating
(b) :  Cooling the sytem
(c) :  Heating followed by cooling
(d) :  Compression at speciffic temp
(e) :  None
Answer:  Increase in hating

Q: The co-factor of an element a denoted by A is ----------

(a) :  (-1)^ij Mij
(b) :  (-1) ^i+j Mij
(c) :  (-1)^i-j Mij
(d) :  (1) ^i+j Mij
(e) :  None
Answer:  (1) ^i+j Mij

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