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Q:

A shopkeeper has a job to print certain number of documents and there are three machines P, Q and R for this job. P can complete the job in 3 days, Q can complete the job in 4 days and R can complete the job in 6 days. How many days the shopkeeper will it take to complete the job if all the machines are used simultaneously ?

A) 4/3 days B) 2 days
C) 3/2 days D) 4 days
 
Answer & Explanation Answer: A) 4/3 days

Explanation:

Let the total number of documents to be printed be 12.

 The number of documents printed by P in 1 day = 4.

 The number of documents printed by Q in 1 day = 3.

 The number of documents printed by R in 1 day = 2.

 
Thus, the total number of documents that can be printed by all the machines working simultaneously in a single day = 9.

 

Therefore, the number of days taken to complete the whole work = 12/9 = 4/3 days.

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Filed Under: Time and Work
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4 3152
Q:

Which action is the best example of a direct observation?

A) listening to a cricket chirp at night and counting the number of chirps per minute B) determining the seal population of an island by counting seals in 10 square meters of the island
C) identifying which bird was present by the tracks that it leaves in the sand at a beach D) reading numbers on a heat sensor to conclude that there is a deer in the night woods
 
Answer & Explanation Answer: A) listening to a cricket chirp at night and counting the number of chirps per minute

Explanation:
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Filed Under: General Science
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4 3151
Q:

The Length of the Day is determined in

A) length of the hours B) length of the year
C) astronomical units D) solar terms
 
Answer & Explanation Answer: C) astronomical units

Explanation:

The Length of the Day is determined in Astronomical Units.

The length of a day corresponds to the time the Earth takes to turn around on its axis, which is approximately 24 hours. But it's not exactly 24 hours. 

This phenomenon is due to tides raised by the Moon which slow Earth's rotation. Because of the way the second is defined, the mean length of a day is now about 86 400.002 seconds, and is increasing by about 1.7 milliseconds per century.

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Filed Under: Physics
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3 3150
Q:

What is the chemical name for vitamin A?

A) Retinol B) Riboflavin
C) Thiamine D) Niacin
 
Answer & Explanation Answer: A) Retinol

Explanation:

Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids.

IUPAC Name :: (2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohexen-1-yl)nona-2,4,6,8-tetraen-1-ol

 

Vitamin Name - Chemical Name

Vitamin A   -     Retinol

Vitamin B1  -    Thiamine

Vitamin B2  -    Riboflavin

Vitamin B3  -    Niacin

Vitamin B5  -    Pantothenic acid

Vitamin B6  -    Pyridoxin

Vitamin B7  -    Biotin

Vitamin B9  -    Folic acid

Vitamin B12  -   Cyanocobalamin

Vitamin C     -   Ascorbic acid

Vitamin D     -   Calciferol

Vitamin E      -   Tocoferol

Vitamin K      -   Phylloquinone and Menaquinones

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Filed Under: General Science
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5 3148
Q:

Which of the following is not an enzyme?

A) Oxytocin B) Trypsin
C) Pepsin D) Ptyalin
 
Answer & Explanation Answer: A) Oxytocin

Explanation:

Oxytocin is a mamallian hormone and also acts as neuro transmitter in the brain.

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Filed Under: Biology
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7 3148
Q:

The fireworks exhibition had awesome

A) affects B) defects
C) effects D) show
 
Answer & Explanation Answer: C) effects

Explanation:

The fireworks exhibition had awesome effects.

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Filed Under: English
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0 3147
Q:

The term Hassles refers to

A) major annoyances of everyday life B) personal limitations that make it impossible for someone to pursue a desired goal
C) to interact with persons we dislike in order to obtain our goals D) minor annoyances of everyday life
 
Answer & Explanation Answer: D) minor annoyances of everyday life

Explanation:

The term Hassles refers to minor annoyances of everyday life.

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Filed Under: English
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Q:

When is genetic drift a major factor in evolution?

A) When there is male competition B) When there is artificial selection
C) When there is no selective pressure D) When there is disruptiveselection
 
Answer & Explanation Answer: C) When there is no selective pressure

Explanation:

Genetic drift or allelic drift is the change in the relative frequency in which a gene variant (allele) occurs in a population due to random sampling and chance.

 

When is genetic drift a major factor in evolution is

* When there is low gene flow.

* When there is no selective pressure.

* When there is a bottleneck.

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Filed Under: Biology
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5 3145