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

Answers 2

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

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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 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

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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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

A point object is kept in front of a plane mirror. The plane mirror is doing SHM of amplitude 2 cm . The plane mirror moves along the x - axis which is normal to the mirror. The amplitude of the mirror is such that the object is always in front of the mirror. The amplitude of SHM of the image is a.0 b.2 cm c.4 cm d.1 cm

Answer:

4cm is the ans of this question

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