Match the following
Metals and Non-metals
Their uses
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
C.
Bakelite and melamine are both thermosetting plastics
Both Bakelite and Melamine are the example of thermosetting polymers. due to extensive cross-linking, these polymers have strongest intermolecular forces and are brittle as cross-linking reduces to the mobility of polymer chain
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.
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