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Q:

A tennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 110 feet per second. After how many seconds does the ball attain its maximum height?

A) 2.87 sec B) 3.44 sec
C) 4.65 sec D) 5.41 sec
 
Answer & Explanation Answer: B) 3.44 sec

Explanation:

It is launched vertically with an initial speed of 110 ft/sec.

It will reach maximum height when the speed drops to 0.

Vo=110 feet per second 

ho=2 feet 

So, h(t) = -16t^2 +110t +2 

Take the derivative: h'(t) = 110 -32t 

The maximum height will be at the inflection when the derivative crosses the x-axis, then h'(t)=0. 

So, set h'(t)=0 and solve for t: 

0 = 110 -32t 

-110 = -32t 

t=3.4375 

t=3.44 seconds.

 

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Filed Under: Physics
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Q:

A person who writes decoratively

A) Choreographer B) Cartographer
C) Calligrapher D) Collier
 
Answer & Explanation Answer: C) Calligrapher

Explanation:

A person who writes decoratively is known as Calligrapher.

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Filed Under: General Awareness
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Q:

Phycology is the branch of botany in which we study about

A) Algae B) Fungi
C) Ecology D) Virus
 
Answer & Explanation Answer: A) Algae

Explanation:
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Filed Under: Biology

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Q:

Purushasukta is founded in the

A) Bhagavad Gita B) Rigveda
C) Manusmriti D) Athrvaveda
 
Answer & Explanation Answer: B) Rigveda

Explanation:
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Filed Under: Indian History

9 7050
Q:

 When assessing the table structure of an acquired set of tables with data, accessing the validity of possible referential integrity constraints on foreign keys is (part of) the:

A) first step. B) second step.
C) third step. D) fourth step.
 
Answer & Explanation Answer: C) third step.

Explanation:
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Filed Under: Database

2 7049
Q:

What is so delicate that even mentioning it breaks it?

Answer

Silence is what is so delicate that even mentioning it breaks it.

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Subject: Logic Puzzles Exam Prep: AIEEE , Bank Exams , CAT , GATE , GRE , TOEFL
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8 7047
Q:

Contour bunding is a method of soil conservation used in

A) Scrublands, liable to spread of weed growth B) Hilly and Slopy or mountain areas
C) Low flat plains, close to stream courses, liable to flooding D) Desert margins, liable to strong wind action
 
Answer & Explanation Answer: B) Hilly and Slopy or mountain areas

Explanation:

Contour bunding is a proven sustainable land management practice for mountainous areas, marginal, sloping, and hilly land where the soil productivity is very low.

 

It is widely adopted by the ethnic minorities of Nepal who practice the shifting cultivation system of farming.

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Filed Under: Indian Geography
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11 7046
Q:

The playground of baseball is known as

A) Diamond B) Court
C) Ring D) Pitch
 
Answer & Explanation Answer: A) Diamond

Explanation:

The playground of baseball is known as Baseball Diamond or the ball field.

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Filed Under: Sports
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5 7044