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Q:

An enzyme speeds up a reaction by

A) raising the activation energy B) absorbing energy
C) lowering the activation energy D) None of the above
 
Answer & Explanation Answer: C) lowering the activation energy

Explanation:

An enzyme speeds up a reaction by lowering the activation energy which is done by catalysts to increase the rate.

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Filed Under: General Science
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Q:

The notable hardness of bone is attributed to

A) the presence of inorganic hydroxyapatites B) the presence of glycoproteins
C) the presence of collagen fibers D) the presence of cartilage
 
Answer & Explanation Answer: A) the presence of inorganic hydroxyapatites

Explanation:
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Filed Under: Biology
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Q:

Is cholesterol Hydrophobic or Hydrophilic?

A) Hydrophobic B) Hydrophilic
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

Cholesterol is referred as an amphipathic molecule, that it contains its hydrophilic and hydrophobic parts.

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Q:

Charminar is made up of which rock?

A) Limestone B) Marble
C) Granite D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Charminar was built at the center of the Hyderabad city in Telangana state, to commemorate the eradication of Plague by Mohammed Quli Qutb Shah in early 1500's. 

charminar_is_made_up_of_which_rock1542451710.jpg image 

It was built with Granite, imestone and Marble.

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Q:

If yesterday were tomorrow, then today would be Friday. What day is today?

A) Saturday B) Monday
C) Sunday D) Tuesday
 
Answer & Explanation Answer: C) Sunday

Explanation:

If yesterday were tomorrow, today is Friday => tomorrow of friday is Saturday.

 

Hence, it implies that today is Sunday if tomorrow is Saturday.

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Filed Under: Calendar
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Q:

What is the value of 100P2 ?

A) 10000 B) 9900
C) 8900 D) 7900
 
Answer & Explanation Answer: B) 9900

Explanation:

Here in 100P2, P says that permutations and is defined as in how many ways 2 objects can be selected from 100 and can be arranged.

 

That can be done as,

 

100 P2  = 100!/(100 - 2)!

= 100 x 99 x 98!/98!

= 100 x 99 

= 9900.

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Filed Under: Permutations and Combinations
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Q:

A train travels 360 km at a uniform speed. If the speed had been 5 km/h more, it would have taken 1 hour less for the same journey. Find the speed of the train?
     

A) 42 kmph B) 43 kmph
C) 40 kmph D) 45 kmph
 
Answer & Explanation Answer: C) 40 kmph

Explanation:

We know that,  Speed = Distance/time

 

Let the speed of the train be = x kmph

           NORMAL SPEED                           SPEED 5 KMPH MORE

          Distance = 360 Km                         Distance =360
 
          speed    =  X Kmph                        Speed = (x+5)
 
            Time =360/X                              Time =360/(x+15)
          

 

For the same journey if the speed increased 10 kmph more it will take 1 hour less

 


Time with original speed - time with increased speed = 1

 => (360/x) - (360/x+10) =  1                               

 =>  (360(x+5)-360x)/x(x+5) =1

 =>   360X + 1800 -360X  = X(X+5)

  =>   X^2 + 5x - 1800 = 0

  X = 40 or -45

 X cannot be negetive value
                  

 X = 40 kmph.

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Filed Under: Problems on Trains
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Q:

H.C.F of 3240, 3600 and a third number is 36 and their L.C.M is 24 x 35 x 52 x 72 . What is the third number?

A) 47628 B) 49874
C) 24157 D) 42146
 
Answer & Explanation Answer: A) 47628

Explanation:

hcf_of_three_numbers_3240,_3600_and_third_number_is_361542439249.jpg image

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Filed Under: HCF and LCM
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