12 self study question with answer--17

Question 1

In a school 70% of the students like Cricket, 65% like Tennis, 27% like none, whereas 248 students like both. Find the total number of students in the school?

  400

  450

  550

  700

It's '400 '
Let the total number of students in school be ‘x’.
So, according to question, x = 0.7x + 0.65x + 0.27x - 248
On solving, we get ‘x’ = 400.

Question 2

If , then find the value of x?

  4

  3

  2

  1

It's '1 '
Given 

Question 3

If , then find the value of sinx?

  8/65

  16/65

  4/65

  32/65

It's '16/65 '
As 

Given cosec x – cot x = 8 ------(i)
⇒ cosec x + cot x = 1/8 -----(ii)
Adding (i) and (ii)
2 cosec x = 65/8
cosec x = 65/16
Sin x = 16/65

Question 4

Directions: Find out the missing number from the given options..

  144

  169

  121

  64

It's '64 '

Similarly, 
Thus answer will be 64.

Question 5

  5

  6

  7

  8

It's '7 '
26 = 3 × 7 + 5
22 = 4 × 5 + 2
Similarly, 45 = 6x + 3 ⇒ x = 7

Question 6

  365

  375

  385

  395

It's '385 '
33 = 27 – 3 + 9
145 = 125 – 5 + 25
Hence, x = 343 – 7 + 49
x = 385

Question 7

Direction: Choose the correct alternative

Making clear and comprehensible

  grotis

  epitaph

  epicure

  elucidate

It's 'elucidate '

Question 8

Which cannot be matched

  inimitable

  neophyte

  oligarchy

  regicide

It's 'inimitable '

Question 9

Instrument which measures ground’s movements

  saccharigraph

  seismograph

  radar

  stereoscope

It's 'seismograph '

Question 10

What is pollination of birds called?

  autogamy

  entomophily

  ornithophily

  anemophily

It's 'ornithophily '

Question 11

Which of the following causes small pox?

  bacteria

  algae

  virus

  fungus

It's 'virus '

Question 12

Largest terrestrial wild animal is?

  African elephant

  Indian elephant

  white elephant

  giraffe

It's 'African elephant '