661. Which of the following chemicals is useful in photography?

A. Aluminium hydroxide
B. Potassium nitrate
C. Silver bromide
D. Sodium chloride
✅ The correct answer is option C.
Silver bromide is useful in photography. When silver bromide is exposed to light it undergoes photochemical decomposition. The silver ions present in silver bromide are reduced to silver metal which remains as an opaque image on the photographic film.

662. Where did 2010 Commonwealth Games took place?

A. Beijing, China.
B. Kuala Lumpur, Malaysia
C. Victoria, Canada
D. New Delhi, India
✅ The correct answer is option D.
2010 Commonwealth Games took place at New Delhi, India. The vibrant city of New Delhi, home to 14 million people, hosted the Commonwealth Games in October 2010. This was the first time India has hosted the Games and only the second time the event has been held in Asia (Kuala Lumpur in 1998 was the first).

664. How much districts are there in Punjab?

A. 14
B. 16
C. 22
D. 21
✅ The correct answer is option C.
There are 22 districts in Punjab. The districts listed are: Amritsar, Bathinda, Faridkot, Firozpur, Fatehgarh Sahib, Kapurthala, Gurdaspur, Hoshiarpur, Jalandhar, Ludhiana, Mansa, Moga, Muktsar, Nawanshahr, Patiala, Rupnagar, Sangrur, and Tarn Taran.

666. The first rice straw power plant has been set up at

A. Kolkata
B. Jalkheri, Punjab
C. Trombay, Maharashtra
D. None of the above
✅ The correct answer is option B.
The first rice straw power plant has been set up at Jalkheri, Punjab. The Jalkheri Power Plant becomes operational, not only about 80,000 MT per annum of rice straw shall be consumed for producing electricity, but this will also save environment from getting polluted which otherwise is polluted due to burning of rice straw by farmers.

667. The first lady Prime Minister of a country was

A. Srimavo Bhadaranaike (Sri Lanka)
B. Maria Estate Pew (Argentina)
C. Junko Taibei (Japan)
D. None of the above
✅ The correct answer is option A.
The first lady Prime Minister of a country was Srimavo Bhadaranaike (Sri Lanka). Ratwatte Dias Bandaranaike, also called Sirimavo R.D. Bandaranaike, (born April 17, 1916, Ratnapura, Ceylon [now Sri Lanka]—died October 10, 2000, Colombo, Sri Lanka), stateswoman who, upon her party’s victory in the 1960 general election in Ceylon (later Sri Lanka), became the world’s first woman prime minister.

668. The Melghat Tiger reserve is in

A. Assam
B. Maharashtra
C. Karnataka
D. Orissa
✅ The correct answer is option B.
The Melghat Tiger reserve is in Maharashtra. Melghat was declared a tiger reserve and was among the first nine tiger reserves notified in 1973-74 under the Project Tiger. It is located at 21°26′45″N 77°11′50″E in northern part of Amravati District of Maharashtra State in India.

669. The term which denotes that each side has made equal point at game point, in Tennis, is referred to as

A. baseline
B. deuce
C. fault
D. grand slam
✅ The correct answer is option B.
The term which denotes that each side has made equal point at game point, in Tennis, is referred to as deuce. Deuce is the score in a game of tennis when both players have forty points. One player has to win two points one after the other to win the game.

670. When did first test tube baby – Louise Brown born?

A. 1939
B. 1958
C. 1981
D. 1978
✅ The correct answer is option D.
In 1978 first test tube baby – Louise Brown was born. Louise Joy Brown is best known as the world’s first “test-tube baby.” Her birth by Caesarian section shortly before midnight on July 25, 1978, at Oldham General Hospital in England, made headlines around the world.