Question

In modern cities most people are carrying solar powered devices
True
False

In 1980s most people carried portable energy devices
True
False

Lasers used for surgery are often on for only a very small fraction of a second at a time.
True
False

Optical microscopes have resolution in the range of microns
True
False

Artificial pacemakers typically use Lead acid batteries
False
True

Household bulbs use power in the range of Watts
True
False

At the present rate of usage of energy, without changing the source of energy, it is likely that amount of carbon dioxide in the atmosphere will double in less than 100 years.
True
False

Large fraction of the energy used by the world comes from fossil fuels
True
False

Modern oil wells have been around for less than 200 years
False
True

The price of crude oil takes into account the time and effort that went into creating it in nature.
True
False

reply me all ans

Answer 1

Here all the answers to the questions are true

Answer 2

1. True

Reason: Solar power is a safe alternative than fossil fuels. It eliminates air, water & land pollution. Thus, it's clean for the environment too.

2. False

Reason: The transistor was the most popular portable device in the year 1960's to several years. So the popularity of the portable devices started after the invention of the portable radio.

3. True

Reason: Different types of Lasers have different time durations. Such as CO2, Diode Laser, Erbhium Laser etc.

4. True

Reason:  The wavelength of imaging light is limited to 200 nanometers or 0.2 microns.

5. False

Reason: It uses a Lithium-ion battery.

6. True

Reason: The brightness is measured in Lumens.

7. True:

Reason: If the source of energy is not changed the Co2 level will definitely double due to high Co2 burning activities.

8. True.

Reason:  It's true and the world needs to concentrate on alternative energy sources.

9. False

Reason: Crude oil prices mainly based on global demand & supply.