If both assertion and reason are true but the reason is not the correct explanation of assertion.
Electric lines of force never cross each other. Electric field at a point add up vectorally to give one resultant electric field. So, they do not have independent existence at the point of superposition so, electric lines of force do not cross each other(crossing of electric lines of force at a point means at a point two fields are having independent existence).

Following are the important features of the town planning of the Harappan cities:

1. The Harappan cities were generally divided into two main parts - the raised area; known as the ‘Citadel’, and the lower town. The Citadel was more in height because the buildings in it were built on mud brick platforms. This area was separated from the lower town by a wall. The Citadel had within its fold important buildings like the Great Bath, the assembly hall, the granary and the workshops. The lower town, on the other hand had residential dwellings.
2. The main streets of the Harappan cities were built according to the grid pattern. They were built from north to south and from east to west.
3. The houses built on the corners of streets were rounded in order to allow the passage of carts. The main road in the city of Mohenjo-daro was 10.5 meters wide and 800 meters long.
4. The house drains relayed all the waste water to the drains built in streets.
5. The streets were so designed as to cross the main road of the city at right angles, thus dividing the city into square or rectangular blocks.

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SAV PUBLIC SCHOOL, JAIPUR
NOTICE

Date: 29 January 21

Invitation for the play 'shakuntalam'

It is hereby informed to all the students that our school is going to organize a play shakuntalam on January 30/2021 ie. Saturday. The play will be staged in the city theater it will their it will start at 10:00 Am. All the students along with their parents are invited for the same, you must reach the teacher tell 9:00Am. The invitation card will be distributed by your respective class teacher.

Nitin
(cultural sectary)

Scarcity refers to a basic economic problem—the gap between limited resources and theoretically limitless wants. This situation requires people to make decisions about how to allocate resources efficiently, in order to satisfy basic needs and as many additional wants as possible.

HOUSE FOR SALE

Available for sale 2BHK house with two bedrooms and attached bathrooms, dining room and a drawing room. The house has the facility of car parking. Also, the house is situated in a green area with the scenic beauty at Gopal Nagar. For further details please contact the undersigned.

The writer says that 'little has moved with time in Firozabad' to make the readers have an idea about the progress speed of the place. When the world is growing and changing with time, Firozabad had not witnessed any change with it.

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The Cuban Missile Crisis of October 1962 was a direct and dangerous confrontation between the United States and the Soviet Union during the Cold War and was the moment when the two superpowers came closest to nuclear conflict.

Cuba was an ally of USSR. It received financial and diplomatic help from USSR. In 1962, the Soviet Union decided to convert Cube into Russian base and planted nuclear missiles. The President of the USA ordered the American warships to intercept any Soviet ships heading to Cuba in order to warn the USSR. Such turn of events brought the two countries closest to the nuclear war. Thus, the Cuban Missile Crisis was the peak of the Cold War. 

Mendel's seminal work was accomplished using the garden pea, Pisum sativum, to study inheritance. This species naturally self-fertilizes, meaning that pollen encounters ova within the same flower. The flower petals remain sealed tightly until pollination is completed to prevent the pollination of other plants.

Elements of Yoga : Yoga is not a mechanical process but a thoughtful process. The main purpose of yoga is to provide a sound body with tension free and sound mind. The ultimate aim of yoga is" self-identification and self perfection which comes through self realization and self purification. According to Patanjali, Yoga consists of 8 (eight) stages to achieve the union of Atma with Parmatma. Patanjali outlines a complete eight fold path that deals with all elements of Yoga in our life inwardly and outwardly.

The elements of Yoga are :

(i) Yama : These are the basic principles, codes of ethics or restraints such as honesty, non-violence, non-stealing and non-possessiveness. These are universal commandments. These restraints are meant to prevent a person from indulging in undesirable worldly activities.

(ii) Niyam : These are basic principles for self, like a healthy body, hygienic habits, proper diet, sleep, rest, work routine, etc. This is a self moral code of discipline. We call it lifestyle development.

(iii) Asana : These are slow stretching activities performed to improve the whole body fitness. Asanas are the postures which keep the body healthy, balanced and helps it in maintaining harmony with nature.

(iv) Pranayama : This is a systematic and rythmic control of breathing, performed to improve the functioning of the body. It is a breathing exercise which includes breath in, retention and breath out and then relax.

Railways were introduced by the British in 1850 in India, however, it began its operation in 1853. It affected the structure of the Indian economy in many ways:

1. It fostered commercialisation on Indian agriculture which adversely affected the self-sufficiency of the village economies in India.
2. It enabled people to undertake long distance travel and thereby break geographical and cultural barriers. They are very useful for carrying heavy goods at long distances as compared to other means of transport.