If none of the case matches, the compiler executes the statements written in the .......... case. (a) for (b) default (c) break

How many times the following body of loop will execute?

for(int a = 1; a <= 10; a++)
{
System.out.println(a);
}

How many times the following message will be printed?

do
{
System.out.println("Hello");
}
ch++;
while(ch <= 1);

Which control structure is used when there is a requirement to check multiple conditions in a program?