Ear | MCQs

Explanation

Explanation

The Rio de Janeiro Earth Summit, took place in June 1992.

It is also known as the United Nations Conference on Environment and Development (UNCED).

It focused on addressing global environmental issues and sustainable development.

Explanation

The stratosphere is the second layer of Earth's atmosphere as you go upwards, lying above the troposphere and below the mesosphere.

The layers of the Earth's atmosphere, in order from the surface, are:

1. Troposphere (up to about 12 km/7.5 miles)
2. Stratosphere (up to about 50 km/31 miles)
3. Mesosphere (up to about 85 km/53 miles)
4. Thermosphere (up to about 600 km/373 miles)

Explanation

A seismograph is an instrument used to detect and record earthquakes.

It consists of a mass attached to a fixed base

During an earthquake, the base moves and the mass does not.

Explanation

Vacuum tubes as the basic components for memory and circuitry for CPU .

These tubes, like electric bulbs, produced a lot of heat and the installations used to fuse frequently.

First generation (1940 - 1956) vacuum tubes as a major piece of technology. 

The ENIAC is  example of 1st generation computer.

Second generation (1956 - 1963) use of transistors.

Third generation (1964 - 1971)  use of Integrated circuits.

Fourth generation (1972 - 2010) use of the microprocessor.

Fifth generation (2010 to present) use Artificial intelligence.

Explanation

Massive Earthquake (زلزلہ)

Location: Turkiye/Syria

Magnitude: 7.8

Date: 6 February 2023

Casualties: over 50, 000

Explanation

• The ozone layer is a layer of gas in the stratosphere that contains a high concentration of ozone (O3).
• It absorbs most of the sun's ultraviolet (UV) radiation, protecting the Earth from harmful UV rays.

Explanation

Explanation

• The Earth is tilted at an angle of 23.5 degrees.
• This tilt is responsible for the changing of the seasons and the difference in the amount of sunlight reaching a given point on the surface during the course of a year.
• The tilt varies between 22.1 and 24.5 degrees in a cycle that averages about 40,000 years.

Explanation

Undersea earthquakes displace a large volume of water, generating powerful sea waves.

This sudden movement creates a tsunami, which can travel across oceans at high speeds.