Explore topic-wise InterviewSolutions in Current Affairs.

(a) Gross investment

When an economic variable is studied at a specific point of time, it is called stock.

The exhaustible natural resources which are formed from the dead remains of living organisms or fossils are known as fossil fuels. 

For example: coal, petroleum and natural gas are fossil fuels. The resources are present in limited amount in nature and are known as exhaustible natural resources. They can be exhausted by human activities.

(d) Eatables and clothes

Natural gas consists of primarily of methane but also contains ethane, propane and heavier hydrocarbons. It also contains small amounts of nitrogen, carbon dioxide, hydrogen sulphide and very little amount of water.

In India, oil is found in Assam, Gujarat, Mumbai High and in the river basins of Godavari and Krishna.

i. 1995 

ii. Between 1996 and 1997 

iii. 1997

iv. Shortage percentage is decreased by 0.3 in between 1994 – 95.

D. butane 

The full form of LPG is Liquefied petroleum gas. It is also referred as propane or butane. It is flammable and is used as fuel in heating appliances, cooking equipment and vehicles.

The fossil fuel such as coal is formed from the remains of dead vegetation. Earth had dense forests in low lying wetland areas about 300 million years ago. Due to natural processes, like flooding, these forests got buried under the soil. Due to soil deposition over these dead plants, they were compressed. The temperature also increased as they sank deeper and deeper. Under high pressure and high temperature, dead plants got slowly converted to coal. As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonisation. Since it was formed from the remains of vegetation, coal is also called a fossil fuel.

The fossil fuel such as petroleum is formed from the dead animals under the sea. As these organisms died, their bodies settled at the bottom of the sea. They got covered with layers of sand and clay. Over millions of years, in the absence of air, with high temperature and high pressure, these the dead organisms were transformed into petroleum and natural gas.

India has huge reserves of natural gas. It has been found in Tripura, Rajasthan, Maharashtra and in the Krishna Godavari delta.

C. charcoal 

Charcoal is mostly pure carbon which is made by cooking wood in a low oxygen environment. This process can take days and burns off volatile compounds such as water, methane, hydrogen, and tar.

Petrol, coke and coal are fossil fuels which are formed from the dead remains of living organisms or fossils.

The exhaustible natural resources which are formed from the dead remains of living organisms or fossils are known as fossil fuels. 

For example: coal, petroleum and natural gas are fossil fuels. The fossil fuel such as petroleum is formed from the dead animals under the sea. As these organisms died, their bodies settled at the bottom of the sea.

They got covered with layers of sand and clay. Over millions of years, in the absence of air, with high temperature and high pressure, these the dead organisms were transformed into petroleum and natural gas. The main constituents of petroleum are petroleum gas, petrol, diesel, lubricating oil, paraffin wax and kerosene. Petroleum can be extracted from under the sea bed. It can be extracted with giant drilling machines. The layer containing petroleum oil and gas is above that of water.

Kerosene is used as fuel in jet aircraft engines.

Natural gas is a fossil fuel other than coal and petroleum. Natural gas consists of ethane, propane and heavier hydrocarbons.

Many useful substances are obtained from petroleum and natural gas. These are termed as ‘Petrochemicals’. These are used in the manufacture of detergents, fibers such as polyester, nylon, acrylic etc., polythene and other man-made plastics. Hydrogen gas obtained from natural gas is used in the production of fertilizers such as urea. Due to its great commercial importance, petroleum is also called ‘black gold’.

The conditions required for combustion to take place are: 

→ Presence of a fuel 

→ Air (or oxygen) 

→ Ignition temperature (minimum temperature at which a substance catches fire).

The fossil fuel such as petroleum is formed from the dead animals under the sea. As these organisms died, their bodies settled at the bottom of the sea. They got covered with layers of sand and clay. Over millions of years, in the absence of air, with high temperature and high pressure, these the dead organisms were transformed into petroleum and natural gas. Many useful substances are obtained from petroleum and natural gas. These are termed as ‘Petrochemicals’. These are used in the manufacture of detergents, fibres such as polyester, nylon, acrylic etc., polythene and other man-made plastics.

Kerosene is used as fuel for stoves, lamps and jet aircrafts.

Correct option is C) Asphalt

The fossil fuel such as petroleum is formed from the dead animals under the sea. As these organisms died, their bodies settled at the bottom of the sea. They got covered with layers of sand and clay. Over millions of years, in the absence of air, with high temperature and high pressure, these the dead organisms were transformed into petroleum and natural gas.

Petroleum was formed from dead organisms that got buried in the sea millions of years ago. These dead bodies got covered with layers of sand and clay. Lack of air, high temperature, and high pressure transformed these dead organisms into petroleum and natural gas.

Correct option is B) Kerosene

(a) fuels

(b) carbon dioxide

(c) liquid, unpleasant

(d) coal, natural gas

(e) exhaustible

Correct option is D) Paints

C) a – ii, b – iii, c – i

Correct option is A) Coal powder

Correct option is C) 1.1

Correct option is B) P-R-Q-S

All matters in the universe exist in three states. 

There are two ways of classification of matter.

1. According to physical state as solid, liquid or gas.

2. According to its composition as element, compound or mixture.

B) the increase in energy deficiency percentage

Correct option is  C) Conical flask

Correct option is D) Both A and C

C) a, b and c only

The resources which can be used again and again are inexhaustible natural resources. Inexhaustible natural resources are the resources which are present in unlimited quantity in nature. These are not likely to be exhausted/end. They have a limitless supply. Examples are sunlight and air.

Matter is defined as anything that occupies space, mass, and volume. Air occupies space and mass. For example: 

i. Take a balloon and blow air into it. 

ii. We will see that balloon expands which shows that air occupies space. 

iii. Weight the balloon and the mass difference.

iv. The difference shows that air occupies mass. 

v. Hence, air can be considered as matter.

Correct option is A) LPG

Solid state of matter has the tendency to maintain its shape when subjected to outside force: 

For example: A rubber band (solid) changes shape under outside force and regains the same shape when the force is removed.

The Right option is : (d) plastic

Uses of Activated Carbon: 

1. Activated Carbon is used to purify liquids. 

2. It is used to treat many types of oral poisonings.

(b) A - 2, B - 4, C - 1, D - 3

Natural gas is a very important fossil fuel because it is easy to transport through pipes. It can be used as a fuel in homes and factories. It is also used as a starting material for the manufacture of a number of chemicals and fertilizers.

Use of CNG in auto mobile is better than petrol because it is All of the above

Diffusion is the process through which the ink is dissolved into the whole water. Ink has lesser density. Hence, it spreads throughout the water.

(a) Pressure Instructed by manual = P_g = 200 K P_a 

(b) Absolute Pressure = 101 k P_a + 200 k P_a = 301 k P_a 

(c) At mountain Peak P_a′ is 10% less 

P_a′ = 90 k P_a 

If we assume absolute pressure in tyre does not change during driving then 

P_g = P – P_a′ = 301 – 90 = 211 k P_a 

So the tyre will read 211 k P_a, pressure.

Coal was formed millions and millions of years ago in swampy forests where some plants died and some grew simultaneously. As the years passed, the layers of dead plants collected one over the other and formed thick layers. With changing weather conditions, more plants grew and the layers of dead plants continued to form deep. Coal is a fossil fuel. The heat and the pressure produced physical and chemical changes in the layers which resulted in the rich carbon content and forced the oxygen into the environment. This rich carbon content became as coal. This process of forcing the oxygen out and leaving behind carbon content was called as carbonisation. In other words, Carbonisation is the process by which plant material or vegetation buried deep under the earth was slowly converted into coal. This is a very slow process and usually, takes millions of years.

(a) When air is blown the particles in air pushes the tyre walls from inside and exerts a pressure on them. 

(b) Steel is used to make railway lines because it is a rigid object having a definite shape and volume and strong also.

It is given that point C is lying somewhere in between A and B Therefore all these points are lying on the same line segment \(\over{AB}\). Hence for every situation in Which point C is lying in between A and B, it may be said that AB = AC +CB

For example:

\(\over{AB}\) is a line segment of 6 Cm and C is a point between A and B, Such that it is 2 cm away from point B. We can find that the measure of line segment \(\over{AC}\) comes to 4 cm Hence, relation AB = AC + CB is verified

(a) Triangle with lengths of sides 7 cm,8 cm, and 9 cm.

Scalene triangle

(b) ∆ ABC with AB = 8.7 cm, AC = 7 cm, and BC = 6 cm.
Scalene triangle

(c) ∆ PQR such that PQ = QR = PR = 5 cm.
Equilateral triangle

(d) ∆ DEE with m∠D = 90°

Right – angled triangle

(e) ∆ XYZ with m∠Y = 90°and XY = YZ

Right – angled isosceles triangle

(f) ∆ LMN with m∠L = 30°, m∠M = 70° and m∠N = 80°

Acute angled triangle.