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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3 6790

Q:

The Green Revolution in India was the outcome of the efforts of who amongst the following?

A) Dr MS Swaminathan	B) Dr C Rangarajan
C) KV Kamath	D) Dr Rakesh Mohan

Answer & Explanation Answer: A) Dr MS Swaminathan

Explanation:

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Filed Under: General Awareness
Exam Prep: Bank Exams
Job Role: Bank PO

18 6789

Q:

When was Jana-Gana-Mana (which later became 'National Anthem' of India) first sung and where ?

A) 24th Jan, 1950 in Allahabad	B) 24th jan, 1950 in Delhi
C) 26th Dec, 1942 in Calcutta	D) 27th Dec, 1911 in Calcutta

Answer & Explanation Answer: D) 27th Dec, 1911 in Calcutta

Explanation:

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Filed Under: Indian Politics

18 6787

Q:

Water has maximum density at............

A) 0 C	B) -15 C
C) 4 C	D) 15 C

Answer & Explanation Answer: C) 4 C

Explanation:

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Filed Under: Physics

11 6785

Q:

Who amongst the following is the Secretary General of UNO

A) Koffi Annan	B) Shashi Tharoor
C) Gordon Drown	D) Hugo Chavez

Answer & Explanation Answer: A) Koffi Annan

Explanation:

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Filed Under: Famous Personalities

2 6774

Q:

I am the first on Earth, the second in Heaven. I appear two times in a week you can only see me once in a year. Although I am in the middle of the sea, l am not found in month, but l am in February, June, September, October, November & December.

Who am I?

Answer

The letter 'E'.

As of the above given data,

It is in the 1st place in Earth, 2nd in Heaven and in the middle of the Sea.

It appears once in a Year and twice in a Week.

It is present in February, June, September, October, November & December.

But not in the Month.

Hence, it is the letter 'E'.

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18 6773

Q:

Irrigation canals are generally aligned along

A) Contour line	B) Straight line
C) Ridge line	D) Valley line

Answer & Explanation Answer: C) Ridge line

Explanation:

Irrigation_canals_are_generally_aligned_along1556259625.png image

A ridge ine is a line formed along the highest points of a mountain ridge.

Irrigation canals are generally aligned along ridge lines.

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Filed Under: Indian Geography
Exam Prep: CAT , Bank Exams , AIEEE
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3 6772

Q:

Light year is a unit of

A) time	B) speed of light
C) distance	D) mass

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