HSSC CLERK EXAM,20.11.2016 (Shift-I)

31. A milkman has 20 litres of milk. He mixes 5 litres of water, which is freely available. in 20 litres of pure milk. If the cost of pure milk is Rs 18 per litre, then the profit of the milkman when he sells all the mixture at cost price is.

(1) 20%
(2) 25%
(3) 33.33%
(4) 18%

Correct Answer: (2) 25%

Solution:Cost price of 20 liters milk = 20 * 18 = 360

Selling price of 25 liters milk = 25 * 18 = 450

Profit = 450 - 360 = 90

Profit % = 90/360 * 100 = 25%

32. One of the two buses completes a journey of 300 km in 15/2 hrs and the other a journey of 450 km in 10 hrs. Find the ratio of their average speeds?

(1) 4:5
(2) 9:8
(3) 8:9
(4) 5:4

Correct Answer: (3) 8:9

Solution:Average speed = Total distance/Total time

Average speed of the first bus

= 300 / 15/2 = 40 km/hr

Average speed of the second bus

= 450/10 = 45km/hr

Ratio of speed = 40/45 = 8/9

33. The HCF of two number is 23 and other two factor of their LCM are 13 and 14. The larger of the two number is.

(1) 276
(2) 299
(3) 322
(4) 345

Correct Answer: (3) 322

Solution:HCF = 23

Factor of LCM = 13 AND 14

Bigger no = HCF * Bigger

factor = 23 * 14 = 322

34. Three times the first of the three consecutive odd interger is 3 more than twice the third. The third integer is.

(1) 9
(2) 12
(3) 13
(4) 15

Correct Answer: (4) 15

Solution:Let consecutive odd numbers x-2, x, x+2

According to the question

3 (x-2) = 2(x+2) + 3

3x - 6 = 2x+4+3

3x - 2x = 6+4+3

x=13

Third number = x+2

= 13+2 = 15

35. Sum of a rational number and Its reciprocal is 3/6. Find the number

(1) 2
(2) 3/2
(3) 4/2
(4) 5/2

Correct Answer: (2) 3/2

Solution:Let number = x

According to the question.

x + 1/x = 13/6

x2 +1/x = 13/6

6x2 + 6 = 13x

6x2 - 13x + 6 = 0

6x2 - 9x - 4x + 6 = 0

3x(2x-3) - 2(2x-3) = 0

(3x-2) (2x-3) = 0

When 3x - 2 = 0

3x= 2

x = 2/3

And 2x - 3 = 0

x = 3/2

36. Alfred Nobel is associated with the invention of

(1) Cosmic rays
(2) Dynamite
(3) Dynamo
(4) Peniallin

Correct Answer: (2) Dynamite

Solution:Alfred Nobel invented Dynamite in 1867. It is an explosive.

37. Banking of curves on roads or railway tracks is done to provide.

(1) Centripetal force
(2) Centrifugal force
(3) Centrifugal acceleration
(4) Angular velocity

Correct Answer: (1) Centripetal force

Solution:Velocity on road or railway track is to provide centripetal force.

38. Diamond is the form of carbon

(1) Crystalline
(2) Amorphous
(3) Chemical
(4) Alkaline

Correct Answer: (1) Crystalline

Solution:Diamond is the crystal-line form of carbon. It is a transparent Gem mostly used in Jewelry.

39. Which of the following gases do plant and trees give out during photosythesis?

(1) Hydrogen
(2) Nitrogen
(3) Oxygen
(4) Both (1) and (ii)

Correct Answer: (3) Oxygen

Solution:In the process of photo-synthesis plants make their foods by taking CO2 Plants release O2 in this process.

40. Food is normally digested in

(1) Liver
(2) Stomach
(3) Small intestine
(4) Large intestines.s

Correct Answer: (3) Small intestine

Solution:Foods are normally digested in small intestine, which is started from saliva of mouth & ends in small intestine.