12 self study question with answer--26

Question 1

If sin x+ sin y= 2, then the find value of cos x+ cos y

  1/2

  -1

  1

  0

It's '0 '
We know that maximum value of sin θ is 1 when θ is 90.
Now, sin x+ sin y= 2 is possible only when x = y =90
Hence, cos x+ cos y= cos 90+ cos 90= 0+ 0= 0

Question 2

On selling 560 balls, a shopkeeper makes a profit equal to selling price of 80 balls. Find his profit percentage.

  16.67

  22.22

  33.33

  25

It's '16.67 '
Let the SP of one ball be Re. 1. On selling 560 balls, total profit = SP of 80 balls =Rs 80.
Now, Rs. 80 is profit on total SP of Rs. 560. Therefore, CP = 560-80= Rs. 480.
Profit %= 100= 16.67%

Question 3

Aman sold his cell for Rs. 49470 at a loss of 15%. Find the price at which he should have sold his cell to gain 14%.

  62358

  35478

  66348

  60256

It's '66348 '
Let CP of the cell be X. After a loss of 15%, SP = 0.85X = 49470. Therefore, X = Rs. 58200.
Now, to gain 14%, SP = 582001.14 =Rs. 66348.

Question 4

In a certain code language, SUN is coded as 27. How will MOON be coded in the same language?

  51

  54

  48

  63

It's '51 '
Taking Z=1, Y=2, X=3 and so on till A= 26, we see that S=8, U=6, N=13.
So, SUN= 8+6+13= 27. Using the same logic, MOON= 14+12+12+13= 51.

Question 5

If white means yellow, yellow means red, red means orange and orange means green then what colour is blood?

  green

  yellow

  orange

  white

It's 'yellow '
Blood is red in colour but in the question yellow means red. Hence yellow is the answer.

Question 6

If 84+70=14; 48+32=16, then 18+4=?

  4

  2

  6

  3

It's '2 '
14 is the HCF of 84 and 70. 16 is the HCF of 48 and 32. Similarly 2 is the HCF of 18 and 4.

Question 7

Which one of the following is correctly spelt?

  Contemperary

  Contemporery

  Contemporary

  Contamporary
Difficulty – Moderate

It's 'Contemporary '

Question 8

Apple-pie order means?

  sweet manner

  revealing the secret

  very delicious in taste

  extreme neatness

It's 'extreme neatness '

Question 9

Very old age when person is weak and behaves like a fool is called?

  senileness

  implicibility

  dotage

  oldage retardness

It's 'dotage '

Question 10

The strait which connects the Pacific Ocean and Atlantic Ocean ?

  Magellan

  Mallaca

  Hormuz

   Gibraltar

It's 'Magellan '

Question 11

Which process converts liquid Vegetable Oil into solid Vanaspati Ghee ?

  volvanisation

  galvanization

  posturization

  hydrogenation

It's 'hydrogenation '

Question 12

The first Afro-Asian Games in 2003 were hosted by?

  Bangalore

  Hyderabad

  Kolkata

  Delhi

It's 'Hyderabad '