Questions

Q:

Why does'nt the hydrogen atom emit X-rays?

A) It is very small in size B) It has only one electron
C) Its energy levels are very close to each other D) it is highly electropositive
 
Answer & Explanation Answer: C) Its energy levels are very close to each other

Explanation:

For an atom to emit X-rays it should have difference in energy levels

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Q:

Cache memory acts between

A) CPU and Hard disc B) RAM and ROM
C) CPU and RAM D) None of the above
 
Answer & Explanation Answer: C) CPU and RAM

Explanation:

Cache memory is an extremely fast memory type that stores data so that future requests for that data can be served faster. It acts as a buffer between RAM and the CPU. It holds frequently requested data and instructions so that they are immediately available to the CPU when needed.

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Q:

The fastest growing plant is ______ ?

A) Ashoka B) Banyan
C) Eucalyptus D) Rose
 
Answer & Explanation Answer: C) Eucalyptus

Explanation:
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Q:

Light year is a unit of

A) time B) speed of light
C) distance D) mass
 
Answer & Explanation Answer: C) distance

Explanation:
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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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Q:

Which type of entity is related to two or more associated entities that each contain specialized attributes that apply to some but not all of the instances of the entity?

A) Supertype entity B) Subtype entity
C) Archetype entity D) Instance entity
 
Answer & Explanation Answer: A) Supertype entity

Explanation:
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Q:

Which color has the highest frequency?

A) Violet B) Red
C) Indigo D) Green
 
Answer & Explanation Answer: A) Violet

Explanation:

In VIBGYOR. It has colors ordered from highest to lowest frequency.

 

              Violet > Indigo > Blue > Green > Yellow > Orange > Red

 

That says Violet has the highest frequency.

We know, Speed of light = Frequency x Wavelength

=> As frequeny is inversely proportional to wavelength i.e, as frequwncy goes high wavelength goes down.

 

So, the violet color has the highest frequency.

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Q:

What do the functions atoi(), itoa() and gcvt () do? Show how would you use them in a program.

Answer

atoi()         Converts a string to an integer.


itoa()         Convert an integer to a string


gcvt()        Converts a floating-point number to a string


 


#include "stdlib.h"


main()


{


      char s[] = "12345";


      char buffer [15], string[20];


      int i;


      


      i = atoi (s);


      printf("\n%d",i);


 


       gcvt (20.141672, 4, buffer);


       printf ("\n%s", buffer);


 


       itoa(15, string,2);


        printf ("\n%s", string);


}

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Subject: Programming

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