Olympiad Test Level 1: Science and Technology - 2 - Class 3

It is a network positioning system by which traffic etc. is monitored.

Both desktop and laptop are used to access information from the internet.

Telescope is used to observe and study objects at a distance.

The boiling point of salts is more than that of water, so, saltwater takes more time to boil. 

Both serve the same purpose. The only difference is that desktops cannot be taken from one place to another but laptops can be taken from one place to another.

Web browsers are used to access internet and information from it.

Air conditioners (ACs) were invented by Willis Carrier.

The Internet has enabled people to attend online classes, work from home, do online shopping and much more.

As there are no atmosphere and water vapours to split the light, and the sun is the brightest source of energy near the earth, so the sky appears to be black from space.

The birds sit on only one wire and keep the circuit incomplete. The electric current does not flow through an incomplete circuit. So, they do not feel electric shock.

Rowland Hill invented first adhesive postage stamps in 1840.

Mountains are natural. Park consists of natural things like plants, etc. but park as a whole is a man-made thing.

Alfred Nobel invented dynamite in 1867.

The tablets combine the features of mobile phones and computers into one gadget.

Explanation: Identity theft and loss of privacy are the two major threats of increased use of gadgets.