HSSC CLERK EXAM, 20.11.2016 (Shift-III)

11. In a certain store, the profit is 320% of the cost. If the cost increases by 25%, the selling price remains constant, approximately what percentage of the selling price is the profit?

(1) 30%
(2) 70%
(3) 100%
(4) 250%

Correct Answer: (2) 70%

Solution:

12. The average expenditure of a man for the first five months was `120 and for the next seven month is `130, what was his monthly average income if he saved `290 in that years.

(1) `130
(2) `110
(3) `190
(4) `250

Correct Answer: (4) `250

Solution:Average expenditure for first five months = 120

Total expenditure for first five months

= 120 × 5 = ₹ 600

Total expenditure for next seven months = 130 × 7 = ₹910

Average monthly Income

= (910+600+290)/12

= 1800/12

= ₹ 150 Per month

13. Find the LCM of 2/3, 4/6, 8/27

(1) 2/3
(2) 8/3
(3) 7/3
(4) 8/27

Correct Answer: (2) 8/3

Solution:LCM of fraction

= LCM of Number /HCF of denominator

= LCM of 2,4,8 /LCM of 3,6,27 = 8/3

14. Find the value in the expression (17)³⁵ × (17)⁻ˣ = 17⁸

(1) 2.29
(2) 2.75
(3) 4.25
(4) 4.5

Correct Answer: (4) 4.5

Solution:(17)³⁵ × 17⁻ˣ = 17⁸

(17)³⁵⁻ˣ = 17⁸

Comparing Powers

35 - x = 8

x = 27

15. A Tap can fill a tank in 6 hours after half the tanks is filled three other tapes of the same efficiency were opened. How much time will it take to fill the tank completely?

(1) 2 hours 30 minutes.
(2) 2 hours 45 minutes.
(3) 3 hours 30 minutes.
(4) 3 hours 45 minutes.

Correct Answer: (4) 3 hours 45 minutes.

Solution:Time taken by first pipe alone 6 hours Efficiency of first pipe = 1/6 hours Time taken by first pipe to fill the half tank = 1/2 / 1/6 = 3 hours Capacity of all four pipe = 4 × 1/6 = 2/3 Time taken to fill the remaining half tank work efficiency 1/2 / 2/3

= 1/2 × 3/2 = 3/4 × 60 = 45 minutes

Total time = 3 hr 45 minutes

16. Which amongst the following is the largest mammal?

(1) Elephant
(2) Whale
(3) Dinosaur
(4) Rhinoceros

Correct Answer: (2) Whale

Solution:Blue whale is the largest mammal. It is a marine animal.

17. 'Mirage' is an example of.

(1) Refraction of light only
(2) Total internal reflection of light only
(3) Reflection and total internal reflection of light
(4) dispersion of lights only

Correct Answer: (2) Total internal reflection of light only

Solution:Mirage is an example of complete internal reflection of light. Like the illusion of water in the strong sun in the desert. Diamond also shine due to its total internal reflection.

18. Lens is made up of.

(1) Pyrex glass
(2) Flint glass
(3) Ordinary glass
(4) Cobalt glass

Correct Answer: (2) Flint glass

Solution:Lens is made up of flint glass, it is an optical device that works on the principle of refraction of light. Due to refractive index of flint glass camera lenses and optical devices are made form this.

19. Communication through optical Fibre works on the principle of.

(1) Scattering
(2) Refraction
(3) Reflection
(4) Total internal reflection.

Correct Answer: (4) Total internal reflection.

Solution:Optical fiber works through the principle of complete internal reflection. It is made from glass or plastic in which light is transmitted in the trams verse directions. It is used in communication, illumination and in medical fields.

20. During galvanisation iron is coated with a thin Layer of.

(1) Copper
(2) Zinc
(3) Nickel
(4) Tin

Correct Answer: (2) Zinc

Solution:Galvanisation is the process of applying a protective zinc coating for the steel or iron to prevent rusting, in which the parts of iron are submerged in a motter zinc.