Explore topic-wise InterviewSolutions in .

Correct option is B) 457 million

B) Bangladesh

Answer is (A) Bagasse

A flow of large amount of current in a circuit, beyond the permissible value of current, is called overloading.

It occurs when many electrical appliances of high power rating, such as a geyser, a heater, an oven, a motor, etc., are switched on simultaneously. This causes fire.

Overloading can be avoided by not connecting many electrical appliances of high power rating in the same circuit.

The electricity meter measures electric energy consumption. It is expressed in ‘units’, where 1 unit means 1 kilowatt·hour ( = 3.6 × 10⁶ joules).

The industry that is not agro-based Cement

C) Infrastructure

Answer is C) 2nd

A) West Bengal

MCB (miniature circuit breaker) is a switch that automatically stops the current in a circuit if the current in it exceeds the specified maximum limit.

Chemical effect of electric current.

c. Generation of a current in a coil due to relative motion between the coil and the magnet.

If the current in the coil A is changed, there will be some current induced in the coil B.

When the current in the coil A is changed, the magnetic field associated with the current changes. This induces potential difference in the coil B. This gives rise to (i.e., induces) a current in the coil B. The greater the rate at which the current in the coil A is changed with respect to time, the greater is the current induced in the coil B as can be seen from the deflection of the pointer in the galvanometer. This phenomenon is known as electromagnetic induction.

Conductors – Copper, Iron, insulators – Plastic, rubber.

Every electric circuit has three basic components:

(a) a source of electric energy such as an electric cell, a battery or a generator.
(b) an output device such as electric bulb, electric device, motor or lamp to draw current.
(c) a connective device is conducting wire or cable.

An alternating current is used in an electric heater and a refrigerator.

[Note Alternating current is also used in an electric iron, a washing machine, an electric mixer, a food processor, an air-conditioner, an electric fan, etc.]

Most of liquid which are electric conductors, are acid solutions, base solutions and salts solutions.

Electric current flows from high to low potential through a conductor.

The three effects of electric current are:

1. Heating effect
2. Magnetic effect
3. Chemical effect

C) Agriculture

When the electric current passes through an electric bulb, the filament of the bulb gets heated to a high temperature due to the heating effect of current. So, the bulbs starts to glow. Sometimes the current is too weak and filament of bulb does not get heat sufficiently and bulb does not glow.

Electromagnet is a coil of insulated current carrying wire wound around a piece of a magnetic substance.

• An important goal of industrial policies in India was to generate employment opportunities in industrial activities. 
• Raising the proportion of people employed in factories is also generally seen as an important indicator of economic development of a country. 
• Today nearly 2 lakh large factories and 3 crore small manufacturing units are operating in India.
• These units employ nearly about one-fifth of India’s 460 million workers. 
• Number of employees generated in industrial section has increased from 11% in 1972-73 to 22 % in 2009-10. 
• But large industries began to replace workers with technology. More and more automation has taken place. 
• This has led to almost zero additional employment in large factrories.

• When goods made in factories and exported to other countries, we get revenue. 
• A few decades before, three-fourths of income from goods exported from manufacturing industries alone. 
• Even today, nearly two-third of goods exports is contributed by industries and particularly small industries. 
• Factory goods exported range from gems, jewellery, chemicals, cars, machinery, cashewnuts, etc. 
• The money or foreign exchange earned in this process enable us to import from other countries a large number of goods that we want from other countries.

(d) The intensity of magnetic field in A is less than in B.

A material which has very low electrical resistance is called a good conductor of electricity. 

Examples: silver, copper, aluminium.

A material which has extremely high electrical resistance is called an insulator of electricity. 

Examples: rubber, wood, glass.

An electromagnet is a coil of insulated wire wound around a piece of a magnetic substance, such as soft iron, which acts as a magnet only as long as the current is flowing in the wire. The magnetic material around which the coil is wound is called the core. The core increases the magnetic effect of the solenoid several times. They are used in electric motors, which find wide application in fans, washing machines, air conditioners, refrigerators, etc.

In India, the value of frequency of AC is 50 hertz.

Industries are necesary for the development of a nation by the following ways. 

1. When goods made in factories and exported to other countries, we get revenue. 

2. A few decades before, three-fourths of income from goods exported from manufacturing industries alone. 

3. Even today, nearly two-third of goods exports is contributed by industries and particularly small industries. 

4. Factory goods exported range from gems, jewellery, chemicals, cars, machinery, cashewnuts, etc.

5. The money or foreign exchange earned in this process enable us to import from other countries a large number of goods that we want from other countries. 

At the same time industrial activities are increasing environmental pollution by the following ways. 

1. The production process in industries involves the use of electricity and application of different chemicals. 

2. In the course of production, these industries release a lot of other materials. They are causing pollution in the industrial locations. 

3. The industrialization led to the indiscriminate exploitation of minerals, forests, soils, air, etc.

4. It leads to deforestation and damages the natural habitat of animals. 

5. Underground water is being contaminated due to the release of wastes by the industries. 

6. Some animals are endangered and some creatures have become extinct. 

7. The depletion of ozone layer, pollution of water, air, soil has increased ecological problems.

1. The employment generation in agricultural sector has been decreased from 74% in 1972-73 to 53% in 2009-10. 

2. The employment generation in industrial sector has been increased from 11% in 1972-73 to 22% in 2009-10. 

3. The employment generation in service sector has shown an increase of 10%.

i. True.

ii. True.

iii. True.

iv. False. (Magnetic field decreases as we go away from a magnet.)

v. False. (Magnetic lines of force do not cross each other.)

When we pick up a piece of iron resting on the ground, we don’t get electric shock because that piece does not carry any electric current at that time.

A device that converts electric energy into mechanical energy is called an electric motor.

The energy given by the cell will get transformed into the kinetic energy of the copper coil in the motor.

i. Electric power = \(\frac{V^2}{R}\)

ii. 1 watt = 1 joule /1 second.

iii. 1 kW.h = 3.6 x 10⁶ j.

iv. According to Joule’s law, quantity of heat (H) produced by an electric current = I²Rt or VIt or \(\frac{V^2}{R}\)t

v. Magnetic effect of electric current was dicovered by Hans Christian Oersted.

• My choice is paper bag and cloth bag. Both are best to use. 
• We should not use plastic bags as they are threat to environment. 
• Plastic bags are not eco – friendly: They won’t decompose quickly, if you burn them also it will take time to mix with soil. 
• Recently in Vijayawada, some areas of the city drowned in rainwater because all the sewage drains were filled with bunches of plastic bags. 
• But paper and cloth bags will decompose in very short period and completely eco friendly.
• Paper bags made by wood pulp it may cause deforestation. 
• Cloth bags made of cotton, quickly it decomposes.

1. Jute industry

2. Challenges faced by the industry include stiff competition in the international market from synthetic substitutes and from other competitors like Bangladesh, Brazil, Philippines, Egypt and Thailand

3. In 2005

4. USA, Canada, Russia, United Arab Republic, UK and Australia.

5. diversified

1. Pie chart tells us the percentage of employment in different sectors from 1972- 73 to 2009-10 years. 

2. Agriculture sector provide highest percentage of employment. 

3. In Industrial sector employment increased twice. 

4. By 2009-10, the services sector is in second place in employment.

In a domestic electric supply in India, the potential difference between the live wire and the neutral wire is 220 V.

[Note: AC is used in domestic electric supply.]

In a domestic electric supply, if two bulbs are connected in series instead of parallel, if the filament of one of the bulbs breaks, there will be no current through the other bulb as well even if the circuit is switched on. Hence the good bulb will also not glow.

Answer is Bulb A.

The main fuse is connected to the live wire (phase wire).

1. The above graph explains % of employment in different sectors. 

2. From 1972-73 to 20019-10 the change in employment in Industrial sector is from 11% to 22%. 

3. Agricultural sector. 

4. Doctor, lawyer, teacher, banking, commerce, communications etc. are the occupations in the sector.

In India, the periodic time of AC is 0.02 s (= \(\frac{1}{50}\)s)

A direct current is used in a portable electric torch and radio.

[Note A Direct current is also in an electric bell, a wall clock, to prepare an electromagnet, for electrolysis, etc.]

AC generator:

1. In an AC generator, the rings used are not split.

2. The direction of the current produced reverses after equal intervals of time.

DC generator:

1. In a DC generator, split rings are used. 

2. The current produced flows in the same direction all the time.

Yes, the electric potential difference across each appliance (in a domestic electric circuit) is the same.

A fuse protects electrical circuits and appliances by stopping the flow of electric current when it exceeds a specified value. For this, it is connected in series with the appliance (or circuit) to be protected. A fuse is a piece of wire made of an alloy of low melting point (e.g. an alloy of lead and tin). If a current larger than the specified value flows through the fuse, its temperature increases enough to melt it. Hence, the circuit breaks and the appliance is protected from damage.

[Note: The fuse wire is usually enclosed in a cartridge of an insulator such as glass or porcelain provided with metal caps. The current rating (such as 1 A, 2 A) may be printed on the cartridge.]

i. The dotted lines represent hydrogen bonds. 

ii. A water molecule can form four H-bonds.

iii. No, it is an example of intermolecular Hbonding.

1. In Ahmedabad and Kanpur

2. Karnataka

3. Ahmedabad, Vadodara, Surat, Rajkot and Porbandar

4. Cotton textile industries

5. AIn Baramula, Srinagar and Anantanag