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Important Questions on Structure of Atom

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Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

Consider a class of

5

girls and

7

boys. The number of different teams consisting of

2

girls and

3

boys that can be formed from this class, if there are two specific boys

A

and

B,

who refuse to be the members of the same team, is:

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Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

Suppose that

20

pillars of the same height have been erected along the boundary of circular stadium. If the top of each pillar has been connected by beams with the top of all its non-adjacent pillars, then the total number of beams is:

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Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

The value of

\sum_{r = 1}^{10} r \cdot \frac{{}^{n}C_{r}}{{}^{n}C_{r - 1}}

is equal to

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Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

A committee of

11

member is to be formed from

8

males and

5

females. If

m

is the number of ways the committee is formed with at least

6

males and

n

is the number of ways the committee is formed with at least

3

females, then

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

Amongst the following statements, that which was not proposed by Dalton was :

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Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

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:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

The Number of ways of choosing

10

objects out of

31

objects of which

10

are identical and the remaining

21

are distinct, is:

HARD

Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

If in a regular polygon the number of diagonals is

54

, then the number of sides of this polygon is:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Dalton's Idea of Atom

There are

m

men and two women participating in a chess tournament. Each participant plays two games with every other participant. If the number of games played by the men between themselves exceeds the number of games played between the men and the women by