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Important Questions on Trigonometric Functions

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Mathematics>Trigonometry>Trigonometric Functions>Angles
A determinant of second order is made with the elements 0, 1. What is the probability that the determinant is positive?
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A bird is sitting on the top of a vertical pole 20 m high and its elevation from a point O on the ground is 45°. It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30°. Then the speed (in m/s) of the bird is 
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Mathematics>Trigonometry>Trigonometric Functions>Angles
Let N denote the set of all natural numbers. Define two binary relations on N as R1=x,y∈N×N:2x+y=10 and R2=x,y∈N×N:x+2y=10. Then
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Consider a triangular plot ABC with sides AB=7 m, BC=5 m and CA=6 m. A vertical lamp-post at the mid-point D of AC subtends an angle 30° at B. The height (in m) of the lamp-post is:
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Mathematics>Trigonometry>Trigonometric Functions>Angles
Two cards are drawn at random and one-by-one without replacement from a well-shuffled pack of 52 playing cards. Find the probability that one card is red and the other is black. 
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A person throws two fair dice. He wins Rs. 15 for throwing a doublet (same numbers on the two dice), wins Rs 12 when the throw results in the sum of 9 , and loses Rs. 6 for any other outcome on the throw. Then the expected gain/loss (in Rs.) of the person is:
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Mathematics>Trigonometry>Trigonometric Functions>Angles
If the angle of elevation of a cloud from a point P which is 25m above a lake be 30° and the angle of depression of reflection of the could in the lake from P be 60°, then the height of the cloud (in meters) from the surface of the lake is :
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Mathematics>Trigonometry>Trigonometric Functions>Angles
Minimum number of times a fair coin must be tossed so that the probability of getting at least one head is more than 99%  is:
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In a class of 60 students, 40 opted for NCC, 30 opted for NSS and 20 opted for both NCC and NSS. If one of these students is selected at random, then the probability that the student selected has opted neither for NCC nor for NSS is :
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Mathematics>Trigonometry>Trigonometric Functions>Angles
The supporting and nutritive cells found in the brain are:
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Mathematics>Trigonometry>Trigonometric Functions>Angles
Glial cells that are phagocytic within the central nervous system are
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Mathematics>Trigonometry>Trigonometric Functions>Angles
All of the following are associated with the myelin sheath except
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Mathematics>Trigonometry>Trigonometric Functions>Angles
What is the unit of nervous system?
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Write a short note on neural coordination.
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Which type of connections are provided by the nervous system for quick coordination (neural)?
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Mathematics>Trigonometry>Trigonometric Functions>Angles
In Hydra, the neural organisation is comprised of
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Mathematics>Trigonometry>Trigonometric Functions>Angles
Which is the longest cell?
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Cardiac muscles are
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Mathematics>Trigonometry>Trigonometric Functions>Angles
Scientists pin-pointed the location of colour-processing perception centres in the human visual cortex by a method named
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Mathematics>Trigonometry>Trigonometric Functions>Angles
In a medullated nerve fibre, the conduction of impulse is faster due to the presence of