A pump can fill a tank with water in 2 hours . Because of a leak, it took 2 1/3 hours to fill the tank. The leak can drain all the water of the tank in. a.41/3 hrs b.7 hrs c.8 hrs d.14 hrs

Answers 1

Answer:

Correct option is D

Step-by-step explanation:

  • Rate of filling the Tank by Pump : [tex]\frac{1}{2}[/tex]
  • Rate of leak while water is being pumped in the tank: [tex]\frac{3}{7}[/tex]
  • Rate of leak in the tank : 1 hour = [tex](\frac{1}{2}-\frac{3}{7} ) = \frac{1}{14}[/tex]
  • ∴ Leak will empty the tank in 14 hrs.
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Fill up the blanks in the following paragraph by selecting the correct option.When migration of a section of population to another place and population occurs, (i) change in the original as well as in the new population. New genes/ alleles are added to the (ii) population and these are lost from the (iii) population. There would be a (iv) if this gene migration, happens multiple times. If the same occurs by chance, it is called (v), Sometimes the change in allele frequency is so different in the new sample of population that they become a different species. The original drifted population becomes founders and the effect is called (vi). a.Natural selection, new, old, gene flow, gene frequencies, founder effect b.Gene frequencies, old, new, natural selection, gene flow, bottle neck effect c.Gene frequencies, new, old, gene flow, genetic drift, founder effect d.Mutations, old, new, natural selection, gene flow, bottle - new effect​

Answer:

type only one question then only I can answer

Light with an average flux of 20 W/cm^2 falls on a non - reflecting surface at normal incidence having surface area 20 cm^2 . The energy received by the surface during time span of 1 minute is : a.12 x 10^3 J b.24 x 10^3 J c.48 x 10^3 J d.10 x 10^3 J

Explanation:

The intensity of the light incident is given by:

I=AtE

Here, I=20W/cm2, Area A=20cm2, time t=1min=1×60sec=60sec

∴20=20×60E

⇒E=20×20×60

E=24×10^3 J

A girl calculates that the probability of her Winning the. first prize in a lottery is 0.08. If 6,000 tickets are sold, how many tickets has she bought? a.40 b.240 c.480 d.750

Answer:

Option (C) 480 is correct

Step-by-step explanation:

Given, total number of tickets = 6000

Probability of her winning

=0.08

Total number of tickets she bought

=6000×0.08=480

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Answer:

option C 480 is the correct answer

The average marks of boys in a class is 52 and that of girls is 42 . The average marks of boys and girls combined is 50 . The percentage of body in the class is a.60 b.40 c.20 d.80

Correct option is D)

Let the number of boys and girls be x and y

According to the question,

⇒  52x + 42y = 50(x+y)

⇒  52x + 42y = 50x + 50y

⇒  52x − 50x = 50y − 42y

⇒  2x = 8y

∴  x = 4y          ------ ( 1 )

Total number of students in the class

 = x + y

                                                          = 4y + y     

 

[ From (1) ]

                                                               = 5y

Percentage of boys =5y / 4y × 100

                                  = 80%

Answer:

option D 80 percent is the correct

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