Arihant Expert Team Solutions for Exercise 1: Exercise 1

Domestic electrical wiring is basically a:

A car is running on a road at a uniform speed of $60$km/h. The net resultant force on the car is:

The efforts to detect the existence of Higgs Boson particle have become frequent news in the recent past. What is/are the importance/importances of discovering this particle?
1. It will enable us to understand as to why elementary particles have mass.
2. It will enable us in the near future to develop the technology of transferring matter from one point to another without traversing, the physical space between them.
3. It will enable us to create better fuels for nuclear fission.
Select the correct answer using the codes given below:

Ball bearings are used in bicycles, cars etc., because_____.

Consider the following phenomena:
$1$. Size of the Sun at dusk.
$2$. Colour of the Sun at dawn.
$3$. Moon being visible at dawn.
$4$. Twinkling of stars in the sky.
$5$. Polestar being visible in the sky.
Which of the above are optical illusions?

Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?
1. Dispersion
2. Refraction
3. Internal reflection
Select the correct answer using the codes given below

With reference to technologies for solar power production, consider the following statements:
1. `Photovoltaic' is a technology that generates electricity by direct conversion of light into electricity, while 'Solar Thermal' is a technology that utilizes the Sun's rays to generate heat which is further used in electricity generation process.
2. Photovoltaic generates Alternating Current (AC), while Solar Thermal generates Direct Current (DC).
3. India has manufacturing base for Solar Thermal technology, but not for Photovoltaic.
Which of the statements given above is/are correct?

Organic Light Emitting Diodes (OLEDs) are used to create digital display in many devices. What are the advantages of OLED displays over Liquid Crystal displays?
1. OLED displays can be fabricated on flexible plastic substrates.
2. Roll-up displays embedded in clothing can be made using OLEDs.
3. Transparent displays are possible using OLEDs.
Select the correct answer using the codes given below :