Answer:
Second Generation: transistors
Third Generation: integrated circuits
First Generation: vacuum tubes
Explanation:
Generations of computers are categorized based on the technologies that were used in them.
Given innovations or technologies are:
<u>transistors
:</u>
Transistors were introduced in the second generation in place of vacuum tubes.
<u>integrated circuits
:</u>
Integrated circuits were introduced in the third generation. An IC consists of multiple transistors.
<u>vacuum tubes:</u>
The very first generation of computers used vacuum tubes to do the calculations. the only drawback was that the tubes used to heat up very soon.
Hence,
Second Generation: transistors
Third Generation: integrated circuits
First Generation: vacuum tubes
Warner Brother produced the Jazz Singer.
Answer:
Correct answer is option (2) that is "return".
Explanation:
In any programming language, a variable name can be made up of letters (lower and upper case) and digits. we can also use "_" underscore character for declaring the variables but we cannot use any special character like “$”.We cannot use digits in the beginning of variables name. And we also cannot use reserved keywords of the language like "new","return","while" etc. There should not be space between the variable names. Options 1, 3 and 4 are not violating any of these properties. But in option (2), "return" is a reserved keyword. That is why it is not a valid variable name.
Some example of valid variables name:
foo
BAZ
Bar
_foo42
foo_bar
Some example of invalid variables name:
$foo ($ not allowed)
while ( keywords )
2foo (started with digit)
my foo (spaces )
Answer:
The answer is "Option c".
Explanation:
A mobile phone is a telecom device, which uses radio signals around an internet-connected area but is served at the same fixed location with a cell tower or transmitter, enabling calls to be transmitted electronically across a wide range, to a fixed over the Internet. By increasing the amount and size of layers within the same market area, the total size of the overall system is improved, and the wrong choices can be described as follows:
- In option a, It is wrong because it can't reuse radio wave frequency.
- In option b, It decreases the size of the cell, that's why it is incorrect.
- In option d, It reduces the size of the cells, which increases the capacity of the smartphone and it also decreases the total time of the device, that's why it is wrong.
