Q:

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

(1) $K_{2} O < N a_{2} O < A l_{2} O_{3} < M g O$

(2) $A l_{2} O_{3} < M g O < N a_{2} O < K_{2} O$

(3) $M g O < K_{2} O < A l_{2} O_{3} < N a_{2} O$

(4) $N a_{2} O < K_{2} O < M g O < A l_{2} O_{3}$

A) Option 1	B) Option 2
C) Option 3	D) Option 4

Answer & Explanation Answer: B) Option 2

Explanation:

While moving from left to right in periodic table basic character of oxide of elements will decrease.

$∴ \to_{I n c r e a \sin g b a s i c s t r e n g t h}^{A l_{2} O_{3} < M g O < N a_{2} O}$

and while descending in the group basic character of corresponding oxides increases.

$∴ \to_{I n c r e a \sin g b a s i c s t r e n g t h}^{N a_{2} O < K_{2} O}$

$∴ C o r r e c t O r d e r i s A l_{2} O_{3} < M g O < N a_{2} O < K_{2} O$

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Filed Under: Chemistry
Exam Prep: AIEEE

14 4519

Q:

The first thermionic valve was invented by

A) Thomas Edison	B) Richardson
C) J.A. Fleming	D) Lee De Forest

Answer & Explanation Answer: C) J.A. Fleming

Explanation:

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Filed Under: Inventions

1 4518

Q:

When is International Mother's Day is observed?

A) December 11	B) November 29
C) 2nd Sunday of May	D) Second Wednesday of October

Answer & Explanation Answer: C) 2nd Sunday of May

Explanation:

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Filed Under: Important Days and Years

4 4517

Q:

During which decade did the population of India record a negative growth rate?

A) 1921 - 31	B) 1911 - 21
C) 1941 - 51	D) 1931 - 41

Answer & Explanation Answer: B) 1911 - 21

Explanation:

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Filed Under: General Awareness

2 4517

Q:

What are the particles emitted by radio active element after 3 consequtive disintegrations?

A) 2 alpha 1 beta	B) 1 alpha 1 beta
C) 2 beta 1 alpha	D) 2 beta 2 alpha

Answer & Explanation Answer: C) 2 beta 1 alpha

Explanation:

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Filed Under: Physics

5 4517

Q:

Solve the Math puzzle?

maths_puzzle1535777263.jpg image

A) 9	B) 15
C) 6	D) 12

Answer & Explanation Answer: C) 6

Explanation:

In the given puzzle, the logic is the product of the number and its preceeding number gives the result.

9 = 9 x 8 = 72

8 = 8 x 7 = 56

7 = 7 x 6 = 42

6 = 6 x 5 = 30

5 = 5 x 4 = 20

Similarly,

3 = 3 x 2 = 6.

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Filed Under: Math Puzzles
Exam Prep: AIEEE , Bank Exams , CAT , GATE , GRE , TOEFL
Job Role: Analyst , Bank Clerk , Bank PO , Database Administration , IT Trainer

13 4516

Q:

Which of the following is usually not considered a goal of portfolio management?

A) To manage the effective and efficient use of resources.	B) To balance the portfolio among incremental and radical investments.
C) To maximize the value of the portfolio by careful examination of candidate projects and exclusion of those no meeting strategic objectives.	D) To ensure that the relationship between projects in the portfolio clearly reflects strategic objectives.

Answer & Explanation Answer: D) To ensure that the relationship between projects in the portfolio clearly reflects strategic objectives.

Explanation:

There is not necessarily a relationship between projects in a portfolio. Answer D is actually one of the goals of PROGRAM management. PMBOK Guide [1.4]

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Filed Under: PMP Certification

0 4511

Q:

National Institute of Nutrition is located at which of the following places?

A) Pune	B) Bangalore
C) Mumbai	D) Hyderabad

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