GRE Questions

Q:

Mirage is an example of

A) Reflection of light & Refraction of light B) Dispersion of light
C) Total Internal Reflection D) Refraction of light & Total Internal Reflection of light
 
Answer & Explanation Answer: D) Refraction of light & Total Internal Reflection of light

Explanation:

A Mirage is a naturally occurring optical phenomenon in which light rays bend to produce a displaced image of distant objects or the sky.




      • It is caused due to Total internal Reflection.

 

      • It is an optical illusion observed in deserts or hot summer days due to which a person sees a pond of water some distance ahead of him in which the surrounding objects appear inverted.

Mirage_is_an_example_of1556276063.jpg image


How Mirage Forms::

 

1. The temperature of other layers of atmosphere goes on decreasing as we go up.
2. Therefore density and refractive index of air changes as one goes up.
3. Thus a ray of light,gets refracted more and more away from the normal.
4. At a particular angle when a ray of light exceeds critical angle, total internal reflection takes place and ray of light gets reflected in the same medium.
5. when the reflected ray reaches our eye, it appears as coming from tree or sky .
6. Hence the inverted image of tree creates an impression from a pond of water.

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Filed Under: Physics
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49 15223
Q:

If he is intelligent,he will pass the examination

Assumptions:

1. To Pass,he must be intelligent

2. He will pass the examination

A) Only 1 is true B) Only 2 is true
C) Either 1 or 2 is true D) Neither 1 nor 2 is true
 
Answer & Explanation Answer: A) Only 1 is true

Explanation:

The statement mentions that he will pass if he is intelligent.So,1 is implicit.further,this means that it is not necessary that he will pass.So, 2 is not implicit

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Filed Under: Statement and Assumptions
Exam Prep: GRE

6 15174
Q:

Raman is performing yoga with his head down and legs up. His face is towards the west. In which direction, will his left hand be ?

A) North B) North - East
C) East D) West
 
Answer & Explanation Answer: A) North

Explanation:

download1491457873.png image

So he is facing west his left hand will be in North direction.

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Filed Under: Direction Sense Test
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89 15110
Q:

6 B in an O?

Answer

The given letter equation 6 B in an O refers to 6 Balls in an Over.

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33 15058
Q:

Should cutting of trees be banned altogether?

Arguments:

I. Yes. It is very much necessary to do so to restore ecological balance.

II. No. A total ban would harm timber based industries.

A) Only argument I is strong B) Only argument II is strong
C) Neither I nor II is strong D) Both I and II are strong
 
Answer & Explanation Answer: D) Both I and II are strong

Explanation:
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Filed Under: Statement and Arguments
Exam Prep: GRE

6 15031
Q:

"I would like to study the impact of pay revision on job satisfaction of employees." - A tells B

Assumptions:

1. Job epairing and painting of office building require funds

2. A has necessary competence to undertake such study

A) Only 1 is true B) Only 2 is true
C) Either 1 or 2 is true D) Both 1 and 2 follow
 
Answer & Explanation Answer: D) Both 1 and 2 follow

Explanation:

Clearly A whishes to study the degree of effect of pay revision on job satisfaction of employees.This means that job satisfaction can be measured and A is capable of making such a study.So,both are not implicit

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Filed Under: Statement and Assumptions
Exam Prep: GRE

2 14953
Q:

Tether is most similar in meaning to

A) Cord B) Unleash
C) Remove D) None of the above
 
Answer & Explanation Answer: A) Cord

Explanation:

Tether is a rope, chain, or the like, by which an animal is fastened to a fixed object so as to limit its range of movement.

Cord is rope like to tie. Hence, cord is most similar in meaning to tether.

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Filed Under: English
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33 14950
Q:

Fear : Threat :: Anger : ?

A) Panic B) Compulsion
C) Force D) Provocation
 
Answer & Explanation Answer: D) Provocation

Explanation:

The given words follow a relation that First arises from the second.

That is, fear arises from the threat. Similarly, anger arises from provocation.

 

Hence, Fear : Threat :: Anger : Provocation.

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Filed Under: Analogy
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33 14931