Olympiad Test Level 1: Technological Developments and Inventions- 2 - Class 7 MCQ

An instrument used to measure blood pressure is sphygmomanometer.

Wasp Sting and its Remedy:
Wasp Sting:
- A wasp sting is the result of a wasp injecting venom into the skin.
- The venom contains several chemicals that cause pain, inflammation, and allergic reactions in some individuals.
Nature of Wasp Sting:
- Wasp stings are alkaline or basic in nature.
- The venom has a pH greater than 7, which means it is alkaline.
Remedy for a Wasp Sting:
- To neutralize the alkaline nature of the wasp sting venom, an acidic substance is required.
- The recommended remedy for a wasp sting is an acid, specifically vinegar or lemon juice.
- The acid helps to neutralize the venom, reducing pain and inflammation.
Answer:
- The correct answer is D: alkaline, acid.
- Wasp stings are alkaline in nature, and the remedy for a wasp sting is an acid to neutralize the venom's alkalinity.

Carpology deals with the study of fruits and seeds.

Who invented Dynamite?
Answer: Alfred B. Nobel
Detailed
Dynamite was invented by Alfred B. Nobel. Here is a detailed explanation of his invention:
1. Alfred B. Nobel:
- Alfred B. Nobel was a Swedish chemist, engineer, and inventor.
- He was born on October 21, 1833, in Stockholm, Sweden.
- Nobel held 355 different patents and made significant contributions to various fields, including chemistry, engineering, and physics.
2. Invention of Dynamite:
- Nobel invented dynamite in the late 1860s.
- Dynamite is an explosive material that is widely used in construction, mining, and warfare.
- It is a stable explosive that could be easily controlled and transported.
3. Motivation behind the invention:
- Nobel's invention of dynamite was driven by his concern for the safety of workers in the mining industry.
- He wanted to create a safer alternative to the existing volatile explosives, such as nitroglycerin.
4. Impact of Dynamite:
- Dynamite revolutionized various industries by providing a reliable and safer explosive material.
- It made construction and mining activities more efficient and less risky.
- Nobel's invention played a significant role in the development of infrastructure worldwide.
5. Nobel Prize:
- Alfred B. Nobel's invention of dynamite brought him both fame and fortune.
- In his will, Nobel left his entire estate to establish the Nobel Prizes, including the Nobel Prize in Chemistry, Physics, Physiology or Medicine, Literature, and Peace.
In conclusion, Alfred B. Nobel, a Swedish chemist and inventor, invented dynamite in the late 1860s. His invention revolutionized various industries and brought him recognition worldwide.

Answer:
To determine the number of servicing missions launched to repair or upgrade the Hubble Space Telescope, we need to review the historical records.
1. Space Shuttle missions:
- The Hubble Space Telescope was launched into space in 1990 by the Space Shuttle Discovery.
- The Space Shuttle program ended in 2011.
- Therefore, the servicing missions must have taken place between 1990 and 2011.
2. Servicing missions:
- From the historical records, a total of five servicing missions were launched to repair or upgrade the Hubble Space Telescope.
- These missions were carried out by the Space Shuttle.
- The purpose of these missions was to address technical issues, replace components, and install new instruments to enhance the functionality and capabilities of the telescope.
Therefore, the correct answer is D: 5.

Periscope is not a scientific instrument.

Larry Page is the co-founder of Google.

Printing machine was discovered by Johannes Gutenberg

India launches GSAT-18 communication satellite from Guiana
India successfully launched its latest communication satellite GSAT-18 from Guiana on October 6, 2016. The satellite was launched aboard an Ariane 5 rocket from the Guiana Space Centre, Europe's spaceport in Kourou, French Guiana. Here are the key details:
Launch Location:
- The GSAT-18 satellite was launched from Guiana, a department of France located on the northeastern coast of South America.
- The Guiana Space Centre is operated by the French space agency, CNES, and is used to launch satellites for various countries.
Launch Vehicle:
- The satellite was launched using an Ariane 5 rocket, which is a heavy-lift launch vehicle operated by Arianespace.
- Ariane 5 is known for its reliability and efficiency, making it a preferred choice for satellite launches.
Objective of GSAT-18:
- GSAT-18 is a communication satellite designed to provide services in the Ku-band and extended C-band frequencies.
- Its main objective is to support telecommunications, television broadcasting, and VSAT services in India.
Specifications of GSAT-18:
- GSAT-18 has a mass of approximately 3,404 kilograms and is equipped with 48 communication transponders.
- It has a mission life of about 15 years and was built by the Indian Space Research Organisation (ISRO).
Significance of GSAT-18:
- GSAT-18 is an important addition to India's existing fleet of communication satellites.
- It will enhance the country's communication capabilities, especially in remote and rural areas, improving connectivity and enabling better access to telecommunication services.
In conclusion, India launched its latest communication satellite GSAT-18 from Guiana, using an Ariane 5 rocket. This satellite will play a crucial role in improving telecommunications, television broadcasting, and VSAT services in India, ultimately enhancing connectivity and accessibility across the country.

The 2nd largest black hole in the Milky Way was found by Japan. Here is a detailed explanation of the discovery:
Background:
The Milky Way is a galaxy that contains billions of stars, and at the center of the galaxy lies a supermassive black hole called Sagittarius A*. Scientists have been studying this black hole and its surrounding environment for many years.
The Discovery:
In 2019, a team of Japanese astronomers made a significant discovery regarding a black hole in the Milky Way. Using the data from the ALMA (Atacama Large Millimeter/submillimeter Array) telescope in Chile, they found a black hole that is estimated to be the 2nd largest in our galaxy.
Key Points:
- The black hole found by Japan is the 2nd largest in the Milky Way.
- The discovery was made using data from the ALMA telescope in Chile.
- The ALMA telescope is an international collaboration, but the Japanese team played a crucial role in analyzing the data and making the discovery.
Conclusion:
In conclusion, the 2nd largest black hole in the Milky Way was found by Japan. This discovery was made possible through the use of the ALMA telescope and the dedicated efforts of the Japanese astronomers involved in the research.