Elitmus Exam Category

Four mirrors are erected perpendicular to the ground to from a rectangle ABCD (where A,B,C,D are four corners of the

Rectangle ) the longer mirror are of length 15cms and shorter mirrors are of length 4cms the reflective surface of all

Mirrors are facing inwards and there is negligible gap b/w two mirrors at the four corners through which nothing more than

a laser beam is shot at mirror BC(longer mirror)through the gap at point A. In a plane parallel to the ground.

Q1 How many times will the laser beam bounce off a mirror surface before exiting the rectangle from point C , if the beam

travels a total distance of 25cm inside the rectangle.
A) 5 B) 4 C)3 D)none

Q2) How many times will the laser beam bounce off a mirror surface before exiting the rectangle from point A, if the beam

Travels the shortest possible distance inside the rectanagle.
A)22 B)15 C)4 D)none

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Elitmus Other Question
a bag contains white and black ball.2 ball is drawn from bag at random.what is the probablity of getting white ball.
1,black ball probablity is 1/3.
2.white ball is 24 How many liters of 20% alcohol should be mixed with 60 % alcohol to get 32% alcohol
(1) We get 70 liters of 32% alcohol
(2) We used 21 lit of 60% alcohol, to prepare 32%
A if the question can be answered by using one of the statements alone, but cannot be answered by using the other statements alone
B if the question can be answered by using either statement alone
C if the question can be answered by using both statements together,but cannot be answered by using either statement alone
D if the question cannot be answered even by using both the statements together