Shanu wants to demonstrate to the class that air has mass. Which one of the following activities will be most suitable for the purpose?
Taking two balloons, inflating them to the same size, attaching each balloon with a string to a ruler and then puncturing one of them
To demonstrate that air has mass, two balloons of the same size are inflated equally and tied with strings to the two ends of a ruler that is balanced at its centre, so that the ruler stays level, showing that the two balloons with equal amounts of air have equal mass.
When one balloon is punctured, air escapes from it and its mass decreases, so that end of the ruler rises while the end with the still-inflated balloon goes down, showing that the air which escaped had mass.
Putting a tissue in a glass tumbler and upending it into water instead demonstrates that air occupies space and does not let water enter the tumbler, not that air has mass.
Upending an empty glass mug into water to observe air bubbles rising, and inflating a balloon on a bottle placed in hot water, demonstrate respectively that air occupies space and that air expands on heating, not that air has mass.
Hence, the answer is that taking two equally inflated balloons tied to a balanced ruler and puncturing one of them is the most suitable activity to demonstrate that air has mass.
Similar Questions
Which of the following best describes a divergent question?
Read the statements given below and choose the correct option:
Assertion: Concept Mapping promotes meaning making through active learning.
Reason: Concept mapping helps students make connections between new ideas that they are attempting to visually represent and those that already exist in their minds.
Important Questions from Methods of Teaching Science
Which of the following are common features of a learner-centred social science classroom?
I. Reading beyond the textbook
II. Creating space for exploration into social issues
III. Using audiovisual content
Which of the following suggestions cannot help you make teaching-learning process participatory in social science?
In which of the following ways is the pattern-seeking test method different from the unbiased test checking method?
I. In pattern-seeking, pupils cannot easily manipulate or control variables because they are working with natural systems.
II. In pattern-seeking, students should keep in mind the increased importance of selecting an appropriate sample size, taking into account the natural variation within samples.
Which of the following statement regarding Observational learning is correct?
I. It is a key learning method for children when acquiring basic tasks such as language and cultural norms.
II. In Observational learning, students think and judge and learn not only how to do certain things but also what the consequences of their action are likely to be.
Who is credited with originating Discovery Learning?
