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maths answer key of cgl tier II exam held on 1 august 2010
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Answer / hitesh
Hemant your 68th and 18th answers are wrong as
18) 0.001008/0.008064=1/8=0.125
68) a+1=(a-1)/(3-2a)
(3-2a)(a+1)=(a-1)
3a-2a^2+3-2a=a-1
a+3-a+1=2a^2
4=2a^2
2=a^2
| Is This Answer Correct ? | 5 Yes | 0 No |
There was one question which many candidates have mistaken to understand :-
The sum of all the digits of the numbers from 1 to 100.
(A) 5050
(B) 903
(C) 901
(D) 900
Correct Ans. (C) 901
Many candidates have understood this question as to find the sum of numbers from 1 to 100 but they haven't noticed that the question is asking to find the sum of the "DIGITS" of the numbers from 1 to 100.
so when we count the digits 1 to 9, that how many times they are repeated in the numbers from 1 to 100....we find that 1 is repeated 21 times and the rest 2 to 9 are repeated 20 times each.Hence the correct answer will be :-
(21*1)+20(2+3+4+5+6+7+8+9)=21+20*44=21+880=901.
| Is This Answer Correct ? | 6 Yes | 2 No |
Answer / sanjib
I thing according to Hitesh ..ans of 2 is D) 214
214/4 = 53 and reminder 2
53/5 = 10 and reminder 3
10/6 = 1 and reminder 4
because devided successively..
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / hitesh sabharwal
1) 77
2) 58
3) 1
4) 2
5) 12/35
6) 2
7) 0
8) 0.125
9) 2
10) 1
11) -11/8
12) (C)root 5
13) 1.8
14) 99/100
15) 5050
16) (A)5-5/19
17) 8000
18) 500
19) 35
20) 200/9
21) 10
22) 5
23) 600
24) 90
25) 10000
26) decreases 1%
27) 3cm
28) 8:27
29) 8:7(not sure)
30) 77 years
31) 48
32) 4000
33) 77/3(not sure)
34) 154 cm^2
35) 25 cm
36) (B)24 root 3
37) (A)4 pi r*r
38) 16(not sure)
39) 10
40) 6%
41) 5:1
42) 60 km/hr
43) (B)7 1/2
44) 600(not sure)
45) 41
46) 4
47) 1/2
48) 6085 cm^2
49) 15
50) 9
51) 2
52) 1/7
53) 1
54) 10
55) (B)root5-root3
56) 0
57) 3/4(npt sure)
58) (a-1)/(3-2a)
59) 13
60) 47
61) 2% increase
62) rs.375
63) Rs.200
64) Rs 30 or Rs 70
65) Rs 20
66) 15%
67) Rs 800
68) Rs 110
69) Rs 4600(not sure)
70) Rs 90
71) 4.04
72) 250
73) Rs 300
74) 39 cm
75) 120
76) 1:1:1
77) 12 months
78) 6 cm
79) 24 cm
80) 640
81) 15 m
82) 2:3
83) Rs 5600(not sure)
84) Rs 772.50
85) 10%
86) 2 km
87)36 km/hr
88) 20
89) 20
90) 22
91) Rs 15000
92) Others
93) Housing
94) 27
95) Rs 34500
96) 25
97) 2009
98) 2006
99) 2007
100) 1212.5
Feel free to point out any errors and post it here
| Is This Answer Correct ? | 3 Yes | 2 No |
Answer / hemant mittal
HELLO HITESH ,
LETS CLEAR UR DOUBTS
Q33 IN TRIANGLE SUM OF THREE ANGLES = 180 SO ALL THREE
HORSES WILL GRAZE = 1/2 OF AREA OF CIRCLE HAVING RADIUS 7 .
Q37 WHEN A SPHERE IS CUT IN 4 EQUAL PIECES OUTER SURFACE
AREA WILL REMAIN 4 PIE R2 OF ALL PIECES BUT EVERY PIECE
WILL HAVE 2 EDGES IF YOU UNFOLD THE EDGES THAT WILL MAKE A
CIRCLE OF SAME RADIUS SO 4 PARTS = 4 PIE R2 AREA AS INNER
AREA SO ANSWER IS 8 .
Q29 ASSUME L=6 B=5 AS GIVEN SO AREA =30 NOW L=7 B= 4 NEW
AREA =28 RATIO 15:14
| Is This Answer Correct ? | 1 Yes | 1 No |
Rest the answers given by Hemant & Hitesh and their mutual corrections are all correct.
| Is This Answer Correct ? | 1 Yes | 1 No |
Answer / hemant mittal
HELLO HITESH ,
PLEASE QUOTE YOUR TEST FORM NO. SO THAT
OTHERS CAN TAKE YOUR HELP. I AM POSTING ANSWER KEY AND
SUGGESTIONS ARE WELCOMED. GAUTAM IF U ARE READING PLEASE
COMMENT...
TEST FORM NO. 000 KO I
1 D 12
2 B 6
3 B 24
4 A 640
5 D 13
6 C 2:3 THOUGH ACC. TO STATEMENT IT WAS 3:2
7 C 6600
8 A 772.50
9 D 10
10 B 2
11 B 77
12 C 58
13 A 1
14 B 2
15 C 12/35
16 C 2 PUT A2 + B2 = 2 IN QUESTION
17 D 0
18 C .5
19 A 2
20 C 1
21 B -11/8
22 C ROOT 5
23 C 1.8
24 B 99/100
25 A 5050
26 A 100/19
27 C 8000
28 A 500
29 C 35
30 C 200/9
31 C 10
32 D 5
33 B 600
34 C 90
35 D 10000
36 A 1%
37 C 3
38 B 8:27
39 B 15:14
40 D 77
41 C 48
42 C 4000
43 C 77
44 C 154
45 B 25
46 B 24ROOT 3
47 C 8 4 OUTER 4 INNER
48 A 16
49 A 10
50 A 6%
51 D 5:1
52 A 60
53 B 15/2
54 B 600
55 A 41
56 C 4
57 A 1/2
58 A 6085
59 A 15
60 C 9
61 A 2
62 B 1/7
63 C 1
64 D 10 1SQUARE + 3SQUARE = 10
65 B ROOT 5- ROOT 3
66 A 0
67 C 4/3
68 C A+1/3-2A CHECK FROM OPTION
69 D 13 ALL PRIME NUMBERS
70 B 47 SERIES IS 5+8+11+14= 46 BUT 47 IS GIVEN
71 A 2% INC
72 C 375
73 A 200
74 A 30 OR 70
75 C 20
76 C 15%
77 A 800
78 B 110
79 ANSWER IS 3600 BUT NOT GIVEN IN OPTIONS
80 A 90
81 B 4.04
82 C 250
83 B 300
84 A 39
85 C 120
86 C 1:1:1 A=1/3 B=1/3 C=1/3
87 C 36 300 METRES - 120 METERS COVERS IN 18 SECONDS.
88 D 20
89 D 20
90 B 22
91 A 15000
92 C
93 B
94 D 27
95 D 34500
96 B 25
97 D 2009
98 A 2006
99 B 2007
100 C 1212.5
| Is This Answer Correct ? | 0 Yes | 1 No |
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