Given below are a few chemical processesA. Rusting of ironB. Burn

Subject

Science

Class

TET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Given below are a few chemical processes
A. Rusting of iron
B. Burning of a candle
C. Respiration
D. Photosynthesis'

Which two of these represent slow combustion? 

  • D and A

  • A and C

  • B and C

  • B and D


B.

A and C

The reaction of an element or compound with an excess of oxygen is called combustion and the combustion process which takes a long time is called slow combustion.

(A)Rusting of iron involves the conversion of iron (Fe) into Fe2O3.xH2O (rust) and takes a longer time, so it is a slow combustion process.

(B)Burning of a candle does not take a longer time, so it is not a slow combustion process.

(C) Respiration involves the breaking down of glucose into CO2 and H2O by O2 and takes a longer time, so it is a slow combustion process.

(D) Photosynthesis, on the other hand, involves the reaction of carbon dioxide and water to give carbohydrate, so it is not a combustion process.


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2.

The smallest of living organisms with cell wall are

  • yeast

  • cyanobacteria

  • algae

  • bacteria


3.

When CNG or LPG undergoes complete combustion, the products formed are

  • CO2 and H2O

  • CO2, SO2, and H2O

  • CO2 only

  • CO2, CO, and H2O


4.

Assessment in Science should focus more on testing the ability of students to

  • answer open-ended questions

  • be sufficiently equipped for higher learning

  • state the facts and principles of Science correctly

  • apply the understanding of concepts to unfamiliar situations in everyday life


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5.

The SI unit of calorific value is

  • J/kg

  • Kilocalorie/kg

  • kJ/kg

  • Calorie


6.

The process of converting sugars into alcohols is known as

  • pasteurisation

  • sterilisation

  • homogenisation

  • fermentation


7.

One of the main limitations of the Project method of teaching Science is that

  • knowledge is not acquired in a sequential manner

  • integration of concept in various subjects can be achieved

  • the students have to perform excessive mental and physical work

  • it is a psychological method


8.

Summative Assessment in Science should mainly focus on 

  • assessing observation skills

  • diagnosing the areas of learning difficulties of students

  • testing of mainly the practical skills

  • testing important theoretical concepts


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9.

The dietary fibres are

  • made up of collagen fibres

  • made up of proteins

  • also called roughage

  • made up of cellulose and proteins


10.

If the frequency of vibrations of a body is decreased and its amplitude is increased, then

  • pitch increases but loudness decreases

  • pitch decreases but loudness increases

  • both pitch and loudness of sound produced will increase.

  • both pitch and loudness of sound produced will decrease


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