Correct Answer: Polymorphic virus

Solution : The correct answer is Polymorphic virus.

To prevent detection by antivirus software, polymorphic viruses vary each time they are installed. This is accomplished by encrypting its code and employing different encryption keys each time. This makes detecting and removing polymorphic malware challenging for antivirus

Correct Answer: Friwsk

Solution : The correct choice is the first option.

Friwsk (incorrect spelling): This is not a recognised word in the English language. The spelling contains an extra 'w' in it. The correct spelling is frisk.

Correct Answer: get on the train by Mumbai.

Solution : The correct choice is the third option.

Explanation: The error lies in the use of "get" instead of the past tense "got", and the preposition "by" is inappropriate; it should be replaced with "to" to correctly convey the intended

Correct Answer: 3 : 2

Solution : Total Production by country X in 2017 = 236
Total Production by country Y in 2020 = 334
Total Production by country Z in 2019 = 380
$\therefore$ Required ratio = $\frac{236 + 334}{380}$ = $\frac{570}{380}$  = $\frac{3}{2}$
Hence, the correct answer is

Correct Answer: $\frac{5}{13}$

Solution :
$\cot A=\frac{12}{5} = \frac{AB}{BC}$
Let $AB$ and $BC$ be 12 units and 5 units respectively.
So, $AC= \sqrt{5^2+12^2} = \sqrt{25+144} = \sqrt{169} = 13$ units
⇒ $\sin A = \frac{BC}{AC} = \frac{5}{13}$
Hence, the correct answer is $\frac{5}{13}$.

Correct Answer: 39

Solution : Given:
6, 8, 17, 19, 28, 30, ?

Add 2 and 9 alternatively to the previous terms to find the next term of the series –
6 + 2 = 8; 8 + 9 = 17; 17 + 2 = 19; 19 + 9 =

Correct Answer: 13.17

Solution : Based on the bar graph provided,
Total number of accidents = 25 + 19 + 30 + 43 + 35 + 27 = 179
Number of months = 6
Average number of accidents = $\frac{\text{The total number of accidents}}{\text{Number of months}}=\frac{179}{6}=29.83$
Number of accidents in

Correct Answer: 42 km/hr

Solution : Given:
The car goes at speed($S_1$) = 70 km/hr
The car returns at speed($S_2$) = 30 km/hr
Average speed = $\frac{2×S_1×S_2}{S_1+S_2}$ (for the same distance at different speeds)
= $\frac{2×70×30}{70+30}$
= $\frac{4200}{100}$
= 42 km/hr
Hence, the correct answer is 42 km/hr.

Correct Answer: the amount of investment

Solution : The correct option is the amount of investment.

Small-scale units are differentiated from large-scale units primarily based on the amount of investment. The distinction between small-scale and large-scale units is often defined by the scale of financial resources, capital, and investment involved

Correct Answer: No Substitution

Solution : The fourth option is the correct answer.

The original sentence is grammatically correct and conveys the intended meaning effectively that the speaker is putting in effort to secure a satisfactory or reasonable financial situation.