HSSC SCREENING EXAM , 2016

11. Find the first four digits of the Square root of 5.23?

(1) 2.287
(2) 2.278
(3) 2.728
(4) 2.286

Correct Answer: (4) 2.286

Solution:Root of 5.23 = 2.286

12. What is the ratio between 11 minutes 55 seconds and 2 hrs 11 minutes 5 seconds?

(1) 2:21
(2) 3:7
(3) 11:14
(4) 1:11

Correct Answer: (4) 1:11

Solution:11 min. 5 sec. =715 Sec and 2 hrs. 11 min 5 sec.

= 7865 sec.

∴ Required ratio = 715: 7865 = 1:11

13. The length of a rectangle is Increased by 10% and breadth is decreased by 10% the area of the new rectangle is:

(1) The Same
(2) Increases by 1%
(3) Decreased by 1%
(4) Decreases by 2%

Correct Answer: (3) Decreased by 1%

Solution:The area of rectangle would decrease by 1%.

(110)(110/100*90/100)=99%

14. If lemons are bought at 2 for a rupee and sold at 5 for three rupees. Find the gain percent?

(1) 15%
(2) 20%
(3) 18%
(4) 25%

Correct Answer: (2) 20%

Solution:

15. A starts a business with 40,000 Rs After 4 month's. B joined the business with 80,000 After 6 month's. C Joined the business with 1.20,000. Find the ratio of their capital?

(1) 6:8:9
(2) 9:8:6
(3) 8:6:9
(4) none of these

Correct Answer: (1) 6:8:9

Solution:

16. The number of turns and radius of the coil of a tangent galvanometer are doubled. The change Factor k will be?

(1) K
(2) 2K
(3) 4K
(4) K/4

Correct Answer: (1) K

Solution:The number of turns & radius of the coil of a tangent galvanometer meter are doubled the change factor K will be same.

17. X-ray region lies in between

(1) Short ratio waves and visible region
(2) Visible and Ultra-Violet region
(3) Gamma rays and Ultra-Violet region.
(4) Short ratio waves and ultraviolet region.

Correct Answer: (3) Gamma rays and Ultra-Violet region.

Solution:X-ray region lies between Gama & UV rays.

18. The half like period of Radium is 1600 years. Its average life time will be?

(1) 3200 years
(2) 4800 years
(3) 2319 years
(4) 4217 years

Correct Answer: (3) 2319 years

Solution:Half life of Radium = 1600 average life time = 2319 years.

19. An example of buffer solution is?

(1) KOH and KCL
(2) NaoK & KOH
(3) K2SO4 and H2SO4
(4) CH3COOH and CH3COO Na

Correct Answer: (4) CH3COOH and CH3COO Na

Solution:CH3COOH, CH3COONa is the example of buffer solution. A buffer is a solution that can resist pH change upon the addition of an acidic or alkalins components. It is able to nutralize small amount of added acid or base.

20. Which hormone is responsible for ejection of milk?

(1) Oxytosin
(2) Prolactin
(3) Thyroxine
(4) Testosteron

Correct Answer: (1) Oxytosin

Solution:Oxytosin is responsible of ejection of milk.