531. The treaty which ushered in NATO, was signed by the member nations at

A. Geneva
B. London
C. Paris
D. Washington
✅ The correct answer is option D.
The treaty which ushered in NATO, was signed by the member nations at Washington. On 4 April 1949, the foreign ministers from 12 countries signed the North Atlantic Treaty (also known as the Washington Treaty) at the Departmental Auditorium in Washington, D.C.: Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom and the United States.

533. Hybridization is

A. decayed vegetable matter
B. a process of tilling the land
C. cross-fertilization between two varieties
D. downward movement of water through soil
✅ The correct answer is option C.
Hybridization is cross-fertilization between two varieties. Hybridization refers to the natural or deliberate pollination between two plants. It occurs all the time in the wild as many plants are cross-pollinated and when the pollen from one plant lands on the stigma of another plant, and if fertilization is successful in producing seed, then hybridization has occurred.

534. WTO, (World Trade Organization), WHO, (World Health Organization) and IDA (International Development Association) are ___ of General Assembly (UNO).

A. principal organs
B. other United Nations Organs
C. specialized agencies and other autonomous organization
D. they are independent agencies and not a part of UNO
✅ The correct answer is option C.
WTO, (World Trade Organization), WHO, (World Health Organization) and IDA (International Development Association) are specialized agencies and other autonomous organization of General Assembly (UNO).

536. Tiruchirapalli is situated on river

A. Cauvery
B. Tapti
C. Krishna
D. Ganga
✅ The correct answer is option A.
Tiruchirapalli is situated on river Cauvery. Tiruchirappalli is situated in central south-eastern India, almost at the geographic centre of the state of Tamil Nadu. The Cauvery Delta begins to form 16 kilometres (9.9 mi) west of the city where the river divides into two streams the Kaveri and the Kollidam to form the island of Srirangam

537. During World War II, when did Germany attack France?

A. 1940
B. 1941
C. 1942
D. 1943
✅ The correct answer is option A.
During World War II, 1940 Germany attack France. The Battle of France, also known as the Fall of France, was the German invasion of France and the Low Countries during the Second World War. On 3 September 1939 France had declared war on Germany, following the invasion of its ally Poland.

538. When the Aryans advanced towards India reaching the Ganges and the Yamuna rivers? It was the time of rise of Ganges Civilization.

A. 2200 BC
B. 1200 BC
C. 2000 BC
D. 1500 BC
✅ The correct answer is option D.
In 1500 BC Aryans advanced towards India reaching the Ganges and the Yamuna rivers. It was the time of rise of Ganges Civilization.

539. What is the language mostly used in Madhya Pradesh?

A. Hindi
B. Marathi
C. English
D. Malayalam
✅ The correct answer is option A.
Hindi, the official state language, is also the language most widely spoken in Madhya Pradesh. Eastern Hindi dialects, represented by Bagheli and Awadhi, are spoken in the southern and eastern parts of the state and in the upper Narmada River valley.