12 self study question with answer--19

Question 1

What is the least number which when divided by 3, 4, and 5 leaves a remainder of 1 in each case and is divisible by 7?

  329

  287

  315

  301

It's '301 '
LCM of 3, 4, and 5 is 60. So the required no. will be 60x + 1 as 1 is the remainder. Also the number is divisible by 7, so putting x = 1, 2, 3 and so on we find x = 5
Hence 301 is the answer.

Question 2

In a class of 150 students, number of boys increased by 20% while number of girls decreased by 10%. If overall strength of the class increased by 10%, then find the number of boys in the class?

  100

  120

  110

  90

It's '100 '
Let there be x no. of boys. Then girls are 150-x
Now, according to question 1.2x + (150-x)(0.9) = 165
⇒ 0.3x = 30
⇒ x = 100

Question 3

Product of two numbers is 72 and their sum is 18. Find the sum of their reciprocals?

  1/4

  4/1

  1/8

  8/3

It's '1/4 '
Let numbers be x and y.
Given, x + y = 18 and xy = 72
Now, 

Question 4

If 100 × 5 = 15; 36 × 2 = 8; 64 × 3 = 11, then 121 × 9 = ?

  8

  11

  20

  2

It's '20 '
100 × 5 = √100 + 5 = 15
36 × 2 = √36 + 2 = 8
64 × 3 = √64 + 3 = 11
Similarly, 121 × 9 = √121 + 9 = 20

Question 5

In some code language, TO is written as 70. How will FISH be written in that language?

  42

  63

  72

  84

It's '84 '
TO: 2(20 + 15) = 2(35) = 70
FISH: 2(6 + 9 + 19 + 8) = 2(42) = 84

Question 6

If in a certain code language, APRIL is coded as 17993. How will JUNE be coded in that language?

  1345

  1355

  1445

  1455

It's '1355 '
A = 1, P = 16 => 1 + 6 = 7, R = 18 => 1 + 8 = 9, I = 9, L = 12 => 1 + 2 = 3
||ly, J = 10 => 1 + 0 = 1, U = 21 => 2 + 1 = 3, N = 14 => 1 + 4 = 5, E = 5
Hence, answer is 1355

Question 7

Direction: Choose the correct alternative which matches to question’s dictionary definition

The river_________ very quickly today, much faster than usual.

  are flowing

  will flow

  flows

  is flowing

It's 'is flowing '

Question 8

Ashish learned English in school, but he ________ most of it.

  had forgotten

  has forgotten

  forgot

  is forgetting

It's 'has forgotten '

Question 9

Call her after eight in the evening, she ___________ dinner by then.

  will be finishing

  will finish

  will have finished

  will have been finished

It's 'will have finished '

Question 10

Buddha delivered his first sermon in?

  Lumbini

  Sarnath

  Vaishali

  Gaya

It's 'Sarnath '

Question 11

Which of the following metals/alloys is the heater element in an electric iron is made of?

  Tungsten

  Steel

  Copper

  Nichrome

It's 'Nichrome '

Question 12

In the treatment of which of the organ is Dialysis used?

  Kidney

  Lungs

  Lever

  Brain

It's 'Kidney '