At which occasion Salat became obligation (Farz)?

Explanation
Five prayers were declared compulsory in the  10th Nabvi. Namaz commanded in  Quran   700 times. Salat was made compulsory at the event of  27 Rajab  ( Miraj ) **** Salat Juma  became  Farz in Madina. Hajj   was made compulsory in  the 09th Hijri. **

Explanation
Masjid al-Qiblatain is located in Medina . It is where Prophet Muhammad (P.B.U.H) changed the direction of prayer (Qibla) from Masjid al-Aqsa to Masjid al-Haram during the Zuhr prayer. The mosque has two domes and two minarets. It was founded by Sawad ibn Ghanam ibn Ka'ab and first opened in 1987. It is traditionally believed to have been built by Abraham and Ishmael.

Explanation
Liaquat Ali Khan ( Born: Oct 1, 1895, Karnal, India – Died: Oct 16, 1951 , Rawalpindi ) was Pakistan’s first Prime Minister. He was assassinated on Oct 16, 1951 , while addressing a gathering of 100,000 at Company Bagh , Rawalpindi (now Liaquat Bagh ). His assassin, Said Akbar , was shot dead by police immediately . Buried at Mazar-e-Quaid, Karachi. Visited the USA in 1951 .

Explanation
All values ( 10, 10, 10, 10 ) are equal, so there is no variation from the mean. Therefore, the standard deviation = 0 .

Explanation
Al-Aqsa Mosque , located in the  Old City of Jerusalem . In Masjid-e-Aqsa the word Aqsa means Far away. Hazart Ibrahim ( A.S) was the Prophet which first laid the foundation of Masjid-e-Aqsa . Masjid-e-Aqsa was the first qibla in Islam. It was built 40 years after Masjid-ul-Haram in Makkah.

Explanation
Vector Quantities :  Velocity, momentum, torque, acceleration. Scalar Quantities :  Work, distance, speed, mass.

Explanation
Light Year  is the distance that light can travel in one year . The distance light travels in  one year  is known as light year . 1 light year is equal to  9.5 x 10¹²km .

Explanation
  The Taiyuan Satellite Launch Center is a People's
Republic of China space and defense launch facility. Situated in Xinzhou, Shanxi Province. This the second of four launch sites having been
founded in 1966 .

Came into full operation in 1968 . ***

Explanation
First  World  population day  was celebrated in  1987 . World  population  day is observed on  July 11. Theme  2024 : Leave no one behind, count everyone Theme 2025:  Empowering young people to create the families they want in a fair and hopeful world

Explanation
Atoms of the same element with different numbers of neutrons are called isotopes. Atoms of the same element have the same number of protons and electrons but different numbers of neutrons.