The probability of finding a green signal on a busy crossing X is 30 % . What is the probability of finding a green signal on X on two consecutive days out of three?

Let A be the event of finding a green signal on a busy crossing X The probability of finding a green signal on a busy crossing X is 30 % . P A = 30 100 = 3 10 The probability of not finding a green signal on a busy crossing X is P A ¯ = 1 - 3 10 = 7 10 . The probability of finding a green signal on X on two consecutive days out of three = P A P A P A ¯ + P A ¯ P A P A = 3 10 × 3 10 × 7 10 + 7 10 × 3 10 × 3 10 = 63 500 .

If in a population of size ”N” the birth rate is represented as “b” and the death rate as “d”, the increase or decrease in “N” during a unit time period ”t” will be: The equation given above can also be represented as: What does ”r” represent. Write any one significance of calculating ”r” for any population?

r here represents the intrinsic rate of increase of population and it is equal to the difference in the natality (birth rate) and mortality (death rate). The 'r' is called the 'intrinsic rate of natural increase. It' is a very important parameter chosen for assessing impacts of any biotic or abiotic factor on population growth. If the value of 'r' is increasing it signifies the growth of the population and if it is going down then the population growth has slowed down.

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Important Questions on Nuclei

HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

Using Kirchhoff $'$ s rules, calculate the current through the $40 Ω$ and $20 Ω$ resistors in the following circuit $:$

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EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

In the given circuit diagram, the currents,

I_{1} = - 0.3 A, I_{4} = 0.8 A

and

I_{5} = 0.4 A,

are flowing as shown. The currents

I_{2}, I_{3}

and

I_{6},

respectively, are:

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HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

State Kirchhoff's law for an electrical network. Using these laws deduce the condition for balance in a Wheatstone bridge.

HARD

Physics>Modern Physics>Nuclei>Nuclear Energy

Match the following and select the correct option:

(a)	Earthworm	(p)	Pioneer species
(b)	Succession	(q)	Detrivore
(c)	Ecosystem service	(r)	Natality
(d)	Population growth	(s)	Pollination

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

The probability of finding a green signal on a busy crossing

X

30 %

. What is the probability of finding a green signal on

X

on two consecutive days out of three?

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

The principle of competitive exclusion was stated by

EASY

Physics>Modern Physics>Nuclei>Nuclear Energy

In the above circuit the current in each resistance is:

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

If in a population of size ”N” the birth rate is represented as “b” and the death rate as “d”, the increase or decrease in “N” during a unit time period ”t” will be:

Question Image

The equation given above can also be represented as:

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What does ”r” represent. Write any one significance of calculating ”r” for any population?

MEDIUM

Physics>Modern Physics>Nuclei>Nuclear Energy

2 M e V

neutron is emitted in a fission reactor. If it looses half of its kinetic energy in each collision with a moderator atom, how many collisions must it undergo to achieve thermal energy of