NIELIT Score Booster Quiz-1

The average age of husband, wife and child 7 years ago was 42 years and that of wife and child 9 years ago was 36 years. The present age of the husband is:

When a two-digit number is multiplied by the sum of its digits, the product is 424. When the number obtained by interchanging its digits is multiplied by the sum of the digits, the result is 280. The sum of the digits of the given number is :

The greatest perfect square number of 6 digits is

M is a square matrix of order ‘n’ and its determinant value is 5 . If all elements of M are multiplied by 2, its determinant value becomes 40 . The value of ‘n’ is

A 3 × 5 matrix has all its entries equal to 1. The rank of the matrix is

A 4-ringed number lock has 10 digits on each ring. How many attempts at the maximum would have to be made before getting the right number?

There are ten boys in a class. In how many ways can they be seated if three boys want to sit together?

What is the output of below program?

#include <stdio.h>

int foo(int* a, int* b)

{

int sum = *a + *b;

*b = *a;

return *a = sum - *b;

}

int main()

{

int i = 0, j = 1, k = 2, l;

l = i++ || foo(&j, &k);

printf("%d %d %d %d", i, j, k, l);

return 0;

}