11.

Match the following

Metals and Non-metals

1. Iodine
2. Mercury
3. Aluminum
4. Chlorine

Their uses

1. Water purification
2. On wounds
3. Thermometers
4. Food packaging

• A : i

  B : ii

  C : iii

  D : iv

• A : iv

  B : ii

  C : iii

  D : i

• A : ii

  B : iii

  C : iv

  D : i

• A : iii

  B : ii

  C : iv

  D : i

Select the true statement from the following.

• Bakelite and melamine are both thermoplastics

• Melamine is a thermoplastic whereas bakelite is a thermosetting plastic

• Bakelite and melamine are both thermosetting plastics

• Bakelite is a thermoplastic whereas melamine is a thermosetting plastic

Read the passage and answer the following question.

A teacher of Class VIII demonstrates the following activity in her class

"The teacher takes a small amount of sulphur in a spoon and burns it. She then puts the spoon into a tumbler with a lid to ensure that the gas produced does not escape. After a few minutes, she adds water to the tumbler."

What happens if blue and red litmus papers are put into the tumbler?

• Blue litmus turns red

• No change in both

• Blue litmus remains blue

• Red litmus turns blue

Read the passage and answer the following question.

A teacher of Class VIII demonstrates the following activity in her class

"The teacher takes a small amount of sulphur in a spoon and burns it. She then puts the spoon into a tumbler with a lid to ensure that the gas produced does not escape. After a few minutes, she adds water to the tumbler."

In the above-demonstrated activity, which substance is formed when sulphur dioxide is dissolved in water?

• Sulphuric acid

• Sulphur hydroxide

• Sulphuric oxide

• Sulphurous acid

Which process skills can be promoted through the above activity?

• Observation, inference and measurement

• Observation and controlling variables

• Observation, classification and inference

• Observation and measurement

A Science teacher asks her students to put two drops each of oil and sugar solution on a flat surface. She then asks them to tilt the surface and observe the order in which the drops reach the bottom. Which property of the liquids is the teacher trying to bring to the student's attention through this activity?

• Viscosity

• Point

• Solubility

• Volume

You find that many of your Class VI students believe that raw material for plant growth comes only from the soil. Which among the following would be the most appropriate strategy to counter this idea?

• Explain in detail the process of photosynthesis and the chemical reactions involved

• Show the students a well-prepared Power Point presentation on photosynthesis

• Provide the students with a money plant in water and ask them to observe its growth and make an inference

• Provide the students with an interesting reading material on the process of food manufacture in plants

The criterion of process validity of Science Curriculum requires that

• Science should be presented as a value-free discipline uninfluenced by societal concerns

• Science should be taught as a specialised discipline with its unique characteristics

• learners should be familiarised with various natural processes

• learners should be engaged in processes that lead to generation of scientific knowledge

Which of the following is not a purpose of conducting practicals/experimental activities in Science?

• They enhance understanding of Science ideas

• They help in scoring high grades or marks

• They provide an opportunity for problem-solving

• They help in developing manipulative skills

A few small wax pieces are fixed at nearly equal distances on a flat strip of aluminium. One end of the strip is clamped to a stand and the other end is heated. Consider the following statements A and B.

1. Wax pieces begin to fall one-by-one in the order of their increasing distance from the flame.
2. Aluminium strip transfers heat from the end nearest to the flame to the other end.

Of the two statements given above

• A is observation and Bis inference

• Both A and B are inferences

• B is observation and A is inference

• Both A and B are observations