Questions

‘has’ is incorrectly used since the sentence is in past tense. Moreover, the subject is cities, which is plural.

When exposed to certain frequencies of radiation, such as radio waves, the subatomic particles called electrons that orbit an atom's nucleus will "jump" back and forth between energy states. Clocks based on this jumping within atoms can therefore provide an extremely precise way to count seconds.It is no surprise then that the international standard for the length of one second is based on atoms. Since 1967, the official definition of a second is 9,192,631,770 cycles of the radiation that gets an atom of the element called caesium to vibrate between two energy states.

India's first 'Fulldome 3D Digital Theatre' was inaugurated in Kolkata.

A negative supply shock in the sho rt run causes the aggregate supply curve to shift to the left.

#include<stdio.h>
int main(){
    int a=5,b=10;
    a=b+a;
    b=a-b;
    a=a-b;
    printf("a= %d  b=  %d",a,b);
}

Maximum hard drive size for FAT16-based windows system is 2GB.