HSSC CLERK EXAM (04.12.2016) (Shift-l)

41. A man buys oranges at ₹5 a dozen and an equal number at 4 a dozen he sells them at 5.50 a dozen and makes a profit of 50. How many oranges does he buy?

(1) 30 dozens
(2) 40 dozens
(3) 50 dozens
(4) 60 dozens.c

Correct Answer: (3) 50 dozens

Solution:Let he buys x dozen orang-es at 5 per dozen and x doz-ens or oranges at ₹ 4 per doz-en total cost = 5x + 4x = 9x

Total quantity = x + x = 2x dozens According to the question. 9x + 50 = (2x) x 5.5 Rightarrow 9x + 50 = 11x Rightarrow 2x = 50 x = 25 Total Dozens of oranges = 2x = 50 dozens

42. The average of 17 numbers is 10.9 and if the average of first nine is 10.5 and that of the last nine is 11.4, the middle number is

(1) 11.8
(3) 10.9
(2) 11.4
(4) 11.7

Correct Answer: (1) 11.8

Solution:Middle number = 9 x 10.5 +9x11:4-17 x 10.9 = 9(10.5 + 11.4) - 17 x 10.9 = 9 * 21.9 - 17 x 10.9 = 197.1 - 185.3 ,=11.8

43. If 6ᵐ = 46656 what is the value of 6ᵐ⁻²

(1) 7776
(2) 7782
(3) 1296
(4) 1290

Correct Answer: (3) 1296

Solution:Given- 6ᵐ = 46656 =(6) 6 Rightarrow m=6 अत: 6ᵐ (m - 2) = 6ᵐ (6 - 2) = 6ᵐ 4 = 1296

44. The value of [(10)⁵ + (10)⁴].

(1) 1000
(2) 10000
(3) 100000
(4) 10

Correct Answer: (2) 10000

Solution:[ [(10)⁵ + (10)⁴]. =100000+ 10000 = 11000

45. Pipes A and B can fill a tank in 5 hours and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in

(1) 6 9/17
(2) 3 9/17
(3) 5 9/17
(4) 4 9/17

Correct Answer: (2) 3 9/17

Solution:

46. Who invented the Aeroplane

(1) Waterman
(2) Oscar
(3) Wilson
(4) Wright brothers

Correct Answer: (4) Wright brothers

Solution:Wright Brothers in 1903 invented airplans Wilber right and davil Wright were their names.

47. Sound travels fastest through

(1) Vacuum
(2) Steel
(3) Water
(4) Air

Correct Answer: (3) Water

Solution:Sound travels from one place to another by a medium The maximum speed of sound is in solid bodies, while the minimum speed of sound is in vaccum. Hence the correct answer would be steel.

48. Which of the following pollutant components is hazardous to human?

(1) carbon monoxide
(2) carbon dioxide
(3) lead particles
(4) carbon particles

Correct Answer: (1) carbon monoxide

Solution:Carbon monoxide is very hazardous to human beings even all gases are harmful which are given in options.

49. Which of the following combination of chromosomes is present in males.

(1) XX
(2) XXX
(3) XY
(4) XYX

Correct Answer: (3) XY

Solution:There are 23 pairs of chro-mosomes in human, 22: tơ somes and 23rd pair is sex chromosomes. They ' x y! combination of sex chromosome is present in male while 'xx' combination of sex chromosome is present in female.

50. What is the main component of bones and tooth?

(1) Calcium carbonate
(2) Calcium phosphate
(3) Calcium sulphate
(4) Calcium nitrate

Correct Answer: (2) Calcium phosphate

Solution:Calcium phosphate is main component of bones and teeth and helpful in bone development.