12 self study question with answer--21

Question 1

In an examination, 600 boys and 800 girls appeared. If 30% of boys and 40% of girls passed the exam, then what percent of students failed? (Nearest integer)

  64

  65

  63

  62

It's '64 '
No. of boys who passed = 30% of 600 = 180
No. of boys who failed = 600-180 = 420
No. of girls who passed = 40% of 800 = 320
No. of girls who failed = 800-320 = 480
Total failed students = 420+480 = 900
Percentages of failed students =  = 64.2~64%

Question 2

If A is more than B by 45% and B is less than C by 20%, then what is the ratio of C:A?

  29:35

  35:29

  29:25

  25:29

It's '25:29 '
Let B = 100, then A = 145
And C =  = 125
C:A = 125:145 = 25: 29

Question 3

A certain sum of money becomes 4 times in 2 years at SI per annum. In how many years can it become 25 times of itself?

  18

  13

  16

  19

It's '16 '
Let P = Rs. 100. So, after 2 years, amount A = Rs. 400.
SI = A-P = 400-100 = Rs.300.
Now money to become 25 times, SI should be Rs. 2400.
As in 2 years SI is Rs. 300, so for SI to be Rs. 2400, time required is 16 years.

Question 4

If W represents ‘×’, X represents ‘÷’, Y represents ‘+’ and Z represents ‘-‘, then the value of 3 W 7 Z 2 Y 8 X 4?

  17

  21

  19.5

  6.75

It's '21 '
3 W 7 Z 2 Y 8 X 4
= 3 × 7-2+8 4
21-2+2 = 21

Question 5

If 69#42 = 4; 84#61 = 3, then 19#31 = ?

  3

  12

  7

  9

It's '7 '
69#42 = > 96/24 = 4
84#61 = 48/16 = 3
Similarly, 19#31 = 91/13 = 7

Question 6

From the alternatives select the group which is most similar to the question group.
Question Group: [13, 17, 23]

  [11, 19, 27]

  [2, 17, 29]

  [31, 37, 57]

  [2, 7, 81]

It's '[2, 17, 29] '
All the numbers in the group are prime numbers.

Question 7

Direction: Fill in the blanks with correct alternative.

Raja went to zoo last Sunday. He saw _____ animals there.

  a many

  much

  many

  very much

It's 'many '

Question 8

Your team has _______ time left.

  a little

  small

  a few

  high

It's 'a little '

Question 9

Last night a musical show happened in GBL College. Do you know _______ of those singers who performed there?

  few

  many

  some

  any

It's 'any '

Question 10

What of the following line connects the points on a map that receive equal amounts of rainfall?

  Isohyet

  Isohel

  Isobar

  Isotherm

It's 'Isohyet '

Question 11

The first Indian Institute of Management was established in?

  Ahmedabad

  Kolkata

  Bangalore

  Lucknow

It's 'Kolkata '

Question 12

Which of the following state is the largest producer of the golden coloured 'Muga' silk in the world?

  Sikkim

  Tripura

  Assam

  Meghalaya

It's 'Assam '