Official Answer Key of Delhi NTSE Stage I 2018-19

Directorate of Education, Govt. of NCT of Delhi
has issued the Answer key of Delhi NTSE Stage I 2018-19
Objections can be sent upto 19/11/18 to sciencebranch@gmail.com

Corrections in the Official answer key
In MAT Paper
Q.26 Answer given in the Official Answer Key is Option (1), correct answer should be Option (4)
26. A vessel contains 60 Ltr. of milk, 12 liters of milk is taken out of it and is replaced by water. Then again from the mixtrue 12 liters are taken out and replaced by water. Find the amount of milk left after the operation.
(1) 28.4 Ltrs. (2) 21.6 Ltrs. (3) 36 Ltrs. (4) 38.4Ltrs.
Ans. (4)
Sol. 12 liters is taken out and replaced by water new ratio is 4 : 1 Now milk is 4/5  part and water is 1/5  part,
Now thus, in 12 liters quantity of milk = 4/5 x 12 = 48/5 Ltr.
So remaining milk = 48 - 48/5 = 38.4 Ltrs.
Q.31 Answer given in the Official Answer Key is Option (2), None of the given options are correct. it should be BONUS
31. 2, 12, 30, ? , 90, 120
(1) 48       (2) 56            (3) 63           (4) 72
Ans. (NA), framing of the question is wrong. If we follow the sequence the missing term should be option (2) 56, but following the same sequence the last number should not be 120 as given, it should be 132, that's why question is wrong
Sol. 1 x 2 = 2 , 3 x 4 =12 , 5 x 6 = 30, 7 x 8 = 56, 9 x 10 = 90 , 11 x 12 =132
Q.51 Answer given in the Official Answer Key is Option (2), None of the given options are correct. it should be BONUS
51. What letter will come next in the following series ? ABCDEFGZYWUVTBCDEFYXWVUCDEXWVR
(1) A           (2) V                (3) B              (4) Z
Ans. (NA)
Sol. Last term should have been D, it's been given R. Following this sequence next term should have been W, which is not given in the option
(1) A to G are the seven element in forward order. From Z to V it should be 7 elements in reverse order, but here in the question there are only 6 elements (X is missing) and it should be placed as TUV but here it is written as TVU
(2) B to F are 5 elements in forward order. From Y to U it should be 5 elements, if we follow the sequence of first statement, here also in reverse order it should have been 4 elements
 Q.54 Answer given in the Official Answer Key is Option (1), None of the given options are correct. it should be BONUS
54. How many such consonants are there in the arrangement, each of which is immediately preceded by a symbol and immediately followed by 2 numbers ?
(1) four          (2) one              (3) two        (4) three
Ans. (NA)
Sol. There is no such consonant as described in the question. The correct answer must be ZERO.
Q.67 Answer given in the Official Answer Key is Option (3), None of the given options are correct. it should be BONUS
67. If ‘JOURNAL’ is coded as ‘QLFIMZQ’ the code pattern followed is serial number -
(1) A      (2) B         (3) C        (4) D
Ans. (NA)
Sol.     A B C D E F G H I J K L M Row. (1)
           Z Y X W V U T S R Q P O N Row (2)
Interchange row (1) and row (2) elements in given word like J replaced with Q just below it. But, from row (1) L and row (2) Q not following the pattern.
Q.71 Answer given in the Official Answer Key is Option (4), None of the given options are correct. it should be BONUS

Q.77 Answer given in the Official Answer Key is Option (2), None of the given options are correct. it should be BONUS

Q.80. Answer given in the Official Answer Key is Option (3), correct answer should be Option (4)
Each vowel in the word KILOMETER is replaced by the previous letter in the English alphabet and each consonant is replaced by the next letter in the English alphabet, then the substituted letters are arranged in alphabatical order, which will be the fifth from the left end ?
(1) D     (2) L             (3) M              (4) N
Ans. (4)
Sol. by following the above pattern K = L, I = H, L = M, O = N, M = N, E = D, T = U, E = D and R = S.
Q.81. Answer given in the Official Answer Key is Option (1), correct answer should be Option (2)

Q.83. Answer given in the Official Answer Key is Option (1), None of the given options are correct. it should be BONUS

Q.86 Answer given in the Official Answer Key is Option (1), None of the given options are correct. it should be BONUS

Q.89 Answer given in the Official Answer Key is Option (2), None of the given options are correct. it should be BONUS

Q.92 Answer given in the Official Answer Key is Option (3), Correct Answer should be Option (4)

Q.94. Answer given in the Official Answer Key is Option (3), None of the given options are correct. it should be BONUS

Corrections in SAT Paper
Q.110 Answer given in the Official Answer Key is Option (1), None of the given options are correct. it should be BONUS

Q.120 Answer given in the Official Answer Key is Option (4), None of the given options are correct. it should be BONUS

Q.147 Answer given in the Official Answer Key is Option (3), Correct answer should be option (4)

Q.155 Answer given in the Official Answer Key is Option (3), Correct answer should be option (2)