Answer: A) promise to pay for goods later. Explanation: If as a business, you buy goods or services on credit from a supplier (accounts payable) then the supplier will supply the goods and business will incur a liability to the supplier for that amount, but no cash will change hands at that stage. Some of those shop keepers allowed regular "trustworthy" customers to purchase items without having the full payment. Hence, Buying on credit means that no actual money has changed hands.

Answer: D) Defence Research and Development Organisation Explanation: DRDO stands for The Defence Research and Development Organisation.   The Defence Research and Development Organisation (DRDO) is an agency of the Republic of India, charged with the military's research and development, headquartered in New Delhi, India.

Answer: C) Gamma Explanation: Cobalt therapy or cobalt-60 therapy is the medical use of gamma rays from the radioisotope cobalt-60 to treat conditions such as cancer.   Cobalt 60 is a synthetic radioactive isotope of cobalt with a half-life of 5.2714 years. It is produced artificially in nuclear reactors.

Answer: A) Massachusetts Explanation: There are 13 colonies and are ruled by England.   The farthest north colony - Massachusetts The farthest south colony - Georgia The oldest colony - Virginia The colony between the 2 parts of Massachusetts - New Hampshire

Answer: D) Ammavin Aran Explanation: The AIADMK IT Wing has launched the first-of-its-kind women safety application in Tamil Nadu. The app is called 'Ammavin Aran' meaning 'mother's fortress'.

In Heights and Distances, The angle of elevation of an object is the angle between the horizontal and the line of sight that is the line from the object to the observer's eye.

Answer: C) Shrimps Explanation: A Shrimps heart is located on its head.

Answer: C) Organisms and their Environment Explanation: Ecology is the branch of science which deals with the study of Ecosystem (relation between the Organisms and their Environment.)