The differences between Mendeleev’s periodic table and modern periodic table are as follows: Mendeleev's periodic table Modern periodic table 1. Elements are arranged in order of increasing atomic mass. 1. Elements .....

The elements which are arranged between IIA and IIIA in the periodic table are called transitional elements. The outermost cells and the penultimate shells in these elements are .....

The region around the nucleus where the probability of finding electrons is maximum is called orbital or sub shell. The different types of sub shell like s, p, d and .....

Isotopes are the elements having same atomic number but different atomic .....

Groups are the vertical columns of elements in periodic .....

The Modern periodic table is superior to Mendeleev's periodic table in following ways: •    The modern periodic table is based on the atomic number which is more fundamental than the atomic weight. •    It .....

The anomalies of Mendeleev's periodic table are: •    The position of hydrogen was not clear in the Mendeleev's periodic table as the hydrogen shows the properties of both of group- IA and group VII-A. •   .....

The drawbacks of Mendeleev's periodic table are: •    The position of hydrogen was not clear in the Mendeleev's periodic table as the hydrogen shows the properties of both of group- IA and group VII A. •   .....

The merits of Mendeleev’s periodic table are: •    Incorrect atomic weights of some of the arranged elements were corrected. •    Existence of some undiscovered elements was predicted and Mendeleev left .....

The following are the characteristics of Mendeleev's periodic table: •    Elements are grouped on or more fundamental basis than earlier attempts. •    The discovery of new elements like inert gases did .....

Mendeleev’s periodic rule states that “The physical and the chemical properties of elements are a periodic function of their atomic .....

Dividing elements in different groups according to their similarities and dissimilarities is called the classification of .....

Hydrogen is kept in group IA of the modern periodic table because of the following reasons: a. Hydrogen has one valence electron as like alkali metals of group IA. b. Hydrogen has one electron in the 1s orbital. It can easily lose that electron to .....

Elements with atomic numbers 58 to 71 occurring after lanthanum are called .....

The horizontal rows of elements in the periodic table are called .....

The shell which is nearest to the nucleus is called .....

Isotopes are those elements which have same atomic number but different atomic .....

An electric bell is a source of sound that converts electrical energy into kinetic energy and sound energy. An electric bell consists of the U-shaped soft iron core around which an insulated wire is wound to make it an electromagnet. A soft iron .....

Potential difference is a measure of work done in moving a unit charge across a circuit. Current in a circuit is equal to the amount of charge flowing in one second. Therefore, the work done in moving 'Q' charges through a potential .....

Differences between heating effect and lighting effect of electricity are as followings. Heating effect Lighting effect .....

The use of alternating current would be limited, if transformer was not invented due to the following reasons: I. If transformer were not invented, then sending current over long distance while keeping constant voltage would cause loss of power in .....

A reaction in which one part of a molecule is replaced by another is called single displacement reaction. Drag .....

A chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination .....

Here, Given, For bulb, Power (P1) = 40 watt = (40 / 1000) kW = 0.04 kW Number (N1) = 3 Time (t1) = 5 х 30 hrs. = 150 hrs. Energy consumptions of 30 days = P1 х N1 х t1= 0.04 х 3 х 150= 18 kWh For heater, Power (P1) = 1500 watt = (1500 / 1000) .....

Here, Given, For bulb, Power (P1) = 100 watt = (100 / 1000) kW = 0.1 kW Number (N1) = 10 Time (t1) = 6 hrs. Energy consumptions in 1 day = P1 х N1 х t1= 0.1 х 10 х 6 = 6 kWh Again, For Iron, Power (P1) = 2 kW Number (N2) = 2 Time (t2) = 4 .....

Uses of transformers are as followings: I. Transformers are used in voltage regulators for computer, television, air conditioner, record player, trolley buses, etc. II. They are used for doorbells, welding purposes and in electrical .....

 The use of alternating current would be limited if the transformer was not invented due to the following reasons:  I. If transformer were not invented, then sending current over a long distance while keeping constant voltage would cause .....

A transformer is a device to convert low a.c. voltage into high a.c. voltage and vice versa.  It consists of a rectangular soft iron core made of laminated sheets. There are two coils which are not connected to one another in any way. These .....

The molecular weight of a substance expressed in terms of grams is called gram molecular .....

Due to the following reasons, the soft iron core is used in a transformer: I.    The soft iron core can convert magnetic energy into electrical energy easily. II.   Soft iron core increases the magnitude of induced e.m.f. in the .....

Here, Given, For bulb, Power (P1) = 60 watt = (60 / 1000) kW = 0.06 kW Number (N1) = 10 Time (t1) = 2 х 30 hrs. = 60 hrs. Energy consumptions of 30 days = P1 х N1 х t1= 0.06 х 10 х 60 = 36 kWh For Iron, Power (P1) = 1500 watt = (1500 / 1000) kW .....

Differences between filament lamp and fluorescent lamp are as followings:   Filament lamp Florescent lamp 1. It converts 10% of total energy into light and remaining into heat. 1. It converts 30% of electrical .....

The causes of energy losses in a transformer are as followings: I.    Heat loss Heat loss is the most common form of energy loss in a transformer. Since there is an electrical current in both the primary and secondary coils of the .....

In a generator, amount of current produced by a generator can be increased by following ways: I.    By increasing the number of turns in the coil. II.   By increasing the strength of magnetic field. III.  By increasing the .....

Safety measures we should follow while using electricity are as following: I.    Avoid water at all times when working with electricity. Never touch or try repairing any electrical equipment or circuits with wet hands. It increases .....

The differences between generator and motor are: Generator Motor 1. It is a device which converts mechanical energy into electrical energy.  1. It is a device which converts electrical energy into mechanical .....

The insulated conductor wire wound in the form of a cylinder is known as a .....

The process of induction of an e.m.f. and current in a coil when the current in a neighbouring coil is switched on or off or changed is called mutual .....

Faraday’s first law of electromagnetic induction states that whenever the magnetic flux linked with a closed circuit changes, an e.m.f. is induced in the .....

A temporary magnet formed by passing current through a coil of wire wound around a piece of soft iron is called .....

The process in which a layer of a particular element is coated on the surface of another conductor by the method of electrolysis is called .....

The process of dissociation of a compound in a solution by passing the electricity is called .....

The electrode connected to the positive terminal of the battery is called .....

The metal plates or wires that are dipped into the electrolytic solution to make an electric connection are known as .....

A heating element is a coil having a very high resistance which is used to convert electrical energy into heat .....

The production of heat by passing an electric current through a wire of high resistance is called the heating effect of .....

The property of a material to oppose the flow of current is called .....

Transformer is a device used to alter the voltage of alternating current.

It is a simple device. It .....

Here, we have to find the output voltage in the given transformer.

.....

Here, we have to find the number of turns in the secondary coil.

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