Aluminium foil used for food cooking and storage sometimes has one shiny surface and one dull surface. When food is wrapped for baking, should the shiny side be in or out ?

Give reasons for the following. (a) Aluminium foils are used to wrap food items. (b) Immersion rods for heating liquids are made up of metallic substances. (c) Copper cannot displace zinc from its salt solution. (d) Sodium is stored in kerosene.

Certain sunglasses use a polarizing material to reduce the intensity of light reflected from shiny surfaces, such as water or the hood of a car. What orientation of polarization should the material have in order to be most effective?

A rubber cube of side 10 cm has one side fixed to a horizontal surface. A tangential force of 2000 N is applied on the opposite face. The distance through which the strained side moves will be (Rigidity modulus of the material is 200xx10^(4)N//m^(2), g=10m//s^(2) )

Read the given passage carefully and answer the questions that follow. Certain words are printed in bold to help you locate them while answering some of these. Good Food is First Food. It is not junk food. It is the food that connects nature and nutrition with livelihoods. This food is good for our health, it comes from the rich _________(A)____________ of our regions, it provides employment to people. Most importantly, cooking and eating it gives us pleasure. In 2013, we had published the first edition of First Food series. I had written then that food is about culture and biodiversity. We often do not think that food diversity, indeed cultural diversity, is linked to the diversity in the biological world. We argued then that we must celebrate the knowledge of plants and their properties and how best to cook them to bring out the flavours and smells. We said then — and we are saying again now — that only when we value the biodiversity on our plates, will we be able to protect the biodiversity in the wild. In 2017 came the second edition First Food: Culture of Taste. In this book, as in the first, we offered recipes of foods along with the knowledge of plant diversity. We did this because it was becoming clear the world was (and is) facing an obesity pandemic — much of the food we eat today is bad for health, with no nutrition or goodness. More importantly, it is now clear that this change in our diet — moving away from home-cooked, nutritious foods borne out of culinary traditions and age-old knowledge — is not incidental or accidental. We are children of the age of processed and factory- grown foods, who have been trans- mutated through a deliberate and subliminal marketing that has changed our habits and our culture of food. We need a re-discovery of this knowledge of food and culture. All is not lost yet — we still eat home-cooked, bio-diverse and nutritious food. But this scenario is changing rapidly. Already, there is evidence that the incidence of diabetes — a disease with strong links to bad food — is increasing, not just among the affluent but also the poor of urban India. Source - https://www.downtoearth.org.in/news/f ood/good-food-is-first-food-and-we- must-nurture-its-economy-68432 149. Which of the following word can fill the blank (A) in the first paragraph of the passage?