A Learning Portal from Recruitment India
A Learning Portal from Recruitment India
D.D.T. was invented by
John Dalton
Paul Muller
Rudolf
None of these
Answer with explanation
Answer: Option AExplanation
It was first synthesized in 1874. DDT’s insecticidal action was discovered by the Swiss chemist Paul Hermann Müller in 1939. DDT was used in the second half of World War II to control malaria and typhus among civilians and troops.
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Inert gases were discovered by
Ramsay
Roentgen
Newton
Dalton
Answer with explanation
Answer: Option AExplanation
Sir William Ramsay, (born Oct. 2, 1852, Glasgow, Scot.—died July 23, 1916, High Wycombe, Buckinghamshire, Eng.), British physical chemist who discovered four gases (neon, argon, krypton, xenon) and showed that they (with helium and radon) formed an entire family of new elements, the noble gases
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ASTRA missile is developed by which of the following Indian defence organization/department?
Hindustan Aeronautics Limited
Bharat Dynamics Limited
DRDO
ISRO
Answer with explanation
Answer: Option CExplanation
Astra is India’s first beyond-visual-range (BVR) air-to-air missile indigenously designed and developed by Defence Research and Development Organisation (DRDO).
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Name the NASA‘s first spacecraft to visit a near-Earth asteroid Benu which will survey the surface, collect a sample and deliver it back to Earth?
ASE
Cloudsat
AIRS
OSIRIS-Rex
Answer with explanation
Answer: Option DExplanation
NASA has released the first images from its OSIRIS-REx mission on August 24, 2018. The mission launched in September, 2016, and, since then, has been traveling toward asteroid Bennu. Now it’s in the final approach phase of the mission, which is due to arrive at the asteroid on December 3. OSIRIS-REx is NASA’s first mission to visit a near-Earth asteroid, survey the surface, collect a sample and deliver it back to Earth.
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Where has the world’s oldest cheese been discovered?
Egypt
China
Germany
Australia
Answer with explanation
Answer: Option AExplanation
World’s oldest cheese has been discovered inside an Egyptian tomb. The world’s oldest cheese was found in the tomb of Ptahmes, mayor of Memphis in Egypt during the 13th century BC. His tomb was first unearthed in 1885. It was lost under drifting sand and was rediscovered in 2010. Archeologists found a jar with a solidified whitish mass inside the tomb. After liquid chromatography and mass spectrometry, researches identified it as cheese. This cheese is nearly 3,200 years old.
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Which element’s discovery was made 150 years ago on August 18, 1868?
Hydrogen
Helium
Sodium
Mercury
Answer with explanation
Answer: Option BExplanation
The element Helium (He) was discovered by astronomers 150 years ago on August 18 in 1868 while studying the total solar eclipse from Guntur, a coastal district of Andhra Pradesh. The Helium was discovered by a team of Madras Observatory led by Norman Robert Pogson. The Madras Observatory now houses the Nungambakkam Meteorological Observatory.
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