Questions

Biological Control: This method is very effective. One pest is destroyed by another organism. For example the aphids are killed by lady beetle. The prickly pear is eradicted by cochineal insect. Here the advantage is, one does not use harmful chemicals which may get into the host plants.

Human eye resolution is 576 Mega Pixels approximately.

Sound waves cannot travel through a Vacuum.

A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.

It is a Postbox or a Mailbox which contains thousands of letters or mails or messages.

TRAP has the highest priority

there are 2 types of interrupts external and internal. NMI has highest priority among all external interrupts, TRAP has highest priority among all internal interrupts. 

The viscosity of a fluid is a measure of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of "thickness".

Here in the given options, syrup has the highest viscosity.

District cooling system is a well known and energy efficient technology adopted across the world. India's 1st district cooling system will come up in the green city Amaravathi, the capital city of Andhra Pradesh state.

District cooling system (DCS) distributes thermal energy in the form of chilled water from a central source to multiple buildings through a network of underground pipes for use in space cooling. The cooling or heat rejection is usually provided from a central cooling plant, thus eliminating the need for separate systems in individual buildings.