Class 8 Science Chapter 2 MCQ

Important Multiple choice questions from chapter 2 Microorganisms: Friend and Foe of CBSE Class 8 Science. This article covers all the questions from this chapter. These questions are important for your school exam and also for future competitive exams. Each questions have been taken from NCERT. So, try to answer all these questions.

1. Which of the following reproduces only inside a host cell?A. VirusB. BacteriaC. FungusD. AmoebaANS: Virus
2. Which microorganism is used in the production of alcohol?A. BacteriaB. AlgaeC. ProtozoaD. YeastANS: yeast
3. Which type of mosquito causes malaria?A. Female Aedas mosquitoB. Female Anopheles MosquitoC. Asian tiger mosquitoD. Yellow fever mosquitoANS:Female Anopheles Mosquito
4. The voice of which of the following is likely to have minimum frequency?A. Baby girlB. Baby boyC. A manD. A womanCorrect Answer: A man
5. When a glass rod is rubbed with a piece of silk cloth, the rod___________________A. And the cloth both acquire positive chargeB. Becomes positively charged, while the cloth has a negative chargeC. And the cloth both acquire negative chargeD. Becomes negatively charged, while the cloth has a positive chargeCorrect Answer: (Option-B) Becomes positively charged, while the cloth has a negative chargeExplanation: When glass rod is rubbed with silk clothes, glass quickly loses electrons, and silk takes electrons out of the glass rod. So after rubbing, the glass rod becomes positively charged and the silk gets negative charge. So, Silk cloths: negatively charged And, Glass rod: positively charged.
6. When air is blown from mouth into a test tube containing limewater, the limewater turns milky. This is due to the presence ofA. Water VapourB. OxygenC. Carbon dioxideD. Carbon monoxideCorrect Answer: Carbon dioxideExplanation: Lime water is calcium hydroxide solution. On reacting with carbon dioxide it forms insoluble calcium carbonate which remains in water as a suspension rendering a milky white colour to it.
7. Which one of the following is the ‘energy currency’ for cellular processes?A. ATPB. GlucoseC. ADPD. Pyruvic acidCorrect Answer: ATPExplanation: Adenosine 5'-triphosphate, or ATP, is the principal molecule for storing and transferring energy in cells. It is often referred to as the energy currency of the cell and can be compared to storing money in a bank.
8. What is the name given to a group of stars in the sky that make up a certain pattern. When the sky is clear these stars can be seen from Earth without the use of a telescope.ANS: ConstellationsEXPLANATION: A constellation is a name given to a group of stars in the sky that make up a certain pattern. Sometimes this pattern is imaginary. When the sky is clear these stars can be seen from Earth without the use of a telescope. Constellation is a Latin word meaning "set with stars".9. Objects in space such as the sun, moon, planets and stars are____________________ANS: Celestial bodiesEXPLANATION: A celestial body can be defined as any natural body outside of the Earth’s atmosphere. Celestial bodies or heavenly bodies are objects in space such as the sun, moon, planets and stars. A natural celestial object, visible in the sky, such as a star, planet, natural satellite, asteroid, comet, the Moon or the Sun.This advance quiz is for students of Class 8th and 9th and if you are 12th standard or college going student then it may be easy for you with little bit challenges. But let me tell you clearly guys no matter which standard questions these are, anyone can attempt this quiz and check his/her knowledge. This will really sharp your knowledge.

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