A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the cost of ₹4989.60. If the cost of white-washing is ₹20 per square meter, find the (i) inside surface area of the dome, (ii) volume of the air inside the dome​

Explanation:

Frederick Winslow Taylor, the father of scientific management, strongly advocated the piece wage sytm in the 19th century. Earlier piece wage system was practiced in the factories of England during the Industrial revolution.

Explanation:

First we need to calculate:

i) No. of subshells ii) No. of orbitals iii) No. of elements

Formula to calculate no. of subshell

1) No. of period is even :

2

(n+2)

2) No. of period is odd :

2

(n+1)

∴

2

(n+2)

⇒n=2

Thus no. of orbitals in various subshell are:

For n=2 we have only s & p orbitals

s has 1 orbital

p has 3 orbital

∴ no. of orbital =4

It is given that each orbital can have a maximum of 3 electrons.

Thus maximum no. of electrons =4×3=12

Hence, the no. of elements = 12

Answer:

A refrigerator is a popular domestic machine that has a thermally insulated compartment and a heat pump that transfers heat from inside the refrigerator to the external environment so that the temperature inside the refrigerator is lower than the ambient temperature of the room.

Nowadays refrigerator is used to preserve food in almost all countries, it reduces the reproduction rate of bacteria because they cannot breed in low temperature.

Keeps the refrigerator temperature slightly above the freezing point, the temperature is kept at 3-5 degrees (37 to 41 degrees F) to keep food safe.

Any machine whose temperature is below freezing point is called Freezer.

Answer:

A refrigerator is a popular domestic machine that has a thermally insulated compartment and a heat pump that transfers heat from inside the refrigerator to the external environment so that the temperature inside the refrigerator is lower than the ambient temperature of the room.

Nowadays refrigerator is used to preserve food in almost all countries, it reduces the reproduction rate of bacteria because they cannot breed in low temperature.

Keeps the refrigerator temperature slightly above the freezing point, the temperature is kept at 3-5 degrees (37 to 41 degrees F) to keep food safe.

Any machine whose temperature is below freezing point is called Freezer.

Even before the fridge, a machine was used to keep cool, which was called icebox, but the refrigerator replaced it.

The fundamental reason for having a refrigerator is to keep food cold. Cold temperatures help food stay fresh longer. The basic idea behind refrigeration is to slow down the activity of bacte- ria (which all food contains) so that it takes longer for the bacteria to spoil the food.

ADVANTAGES OF REFRIGERATOR:

We can store food in the fridge for a long time and keep it free from germs.

Some food items are get deteriorate quickly due to the outside environment, we can also keep them in the fridge and use them after a few days.

Even if the food is not wicked outside, there is a risk of insects getting bogged down, but the food is also saved from insects inside the fridge.

We keep drinking water, cold drinks, there is no use of drinking without cooling and in that sense, it is also very beneficial for us.

DISADVANTAGES OF REFRIGERATOR:

We have to keep the fridge continuously with 24 * 7 electricity and it costs a lot of electricity.

Although we use the fridge every day but pay very little attention to it, most of all we remember it in the summer season because we need cold water and a cold drink.

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Answer:

Copper which is blisttered is called blisttered copper.

Explanation:

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Answer:Blister copper is a metallic copper which has a black blistered surface, The blister copper is about 98% pure and the other percentage consists of impurities it has blistered appearance due to the evolution of sulphur dioxide gas.

blister” copper containing between 98.5 and 99.5 percent copper and up to 0.8 percent oxygen.

Explanation: