chapter 2 case study quizlet

Review Questions

Scientific hypotheses are ________ and falsifiable.

________ are defined as observable realities.

Scientific knowledge is ________.

A major criticism of Freud’s early theories involves the fact that his theories ________.

• were too limited in scope
• were too outrageous
• were too broad
• were not testable

Sigmund Freud developed his theory of human personality by conducting in-depth interviews over an extended period of time with a few clients. This type of research approach is known as a(n): ________.

• archival research
• naturalistic observation

________ involves observing behavior in individuals in their natural environments.

The major limitation of case studies is ________.

• the superficial nature of the information collected in this approach
• the lack of control that the researcher has in this approach
• the inability to generalize the findings from this approach to the larger population
• the absence of inter-rater reliability

The benefit of naturalistic observation studies is ________.

• the honesty of the data that is collected in a realistic setting
• how quick and easy these studies are to perform
• the researcher’s capacity to make sure that data is collected as efficiently as possible
• the ability to determine cause and effect in this particular approach

Using existing records to try to answer a research question is known as ________.

• survey research
• longitudinal research

________ involves following a group of research participants for an extended period of time.

• cross-sectional research

A(n) ________ is a list of questions developed by a researcher that can be administered in paper form.

Longitudinal research is complicated by high rates of ________.

• observation
• generalization

Height and weight are positively correlated. This means that:

• There is no relationship between height and weight.
• Usually, the taller someone is, the thinner they are.
• Usually, the shorter someone is, the heavier they are.
• As height increases, typically weight increases.

Which of the following correlation coefficients indicates the strongest relationship between two variables?

Which statement best illustrates a negative correlation between the number of hours spent watching TV the week before an exam and the grade on that exam?

• Watching too much television leads to poor exam performance.
• Smart students watch less television.
• Viewing television interferes with a student’s ability to prepare for the upcoming exam.
• Students who watch more television perform more poorly on their exams.

The correlation coefficient indicates the weakest relationship when ________.

• it is closest to 0
• it is closest to -1
• it is positive
• it is negative

________ means that everyone in the population has the same likelihood of being asked to participate in the study.

• operationalizing
• placebo effect
• random assignment
• random sampling

The ________ is controlled by the experimenter, while the ________ represents the information collected and statistically analyzed by the experimenter.

• dependent variable; independent variable
• independent variable; dependent variable
• placebo effect; experimenter bias
• experiment bias; placebo effect

Researchers must ________ important concepts in their studies so others would have a clear understanding of exactly how those concepts were defined.

• randomly assign
• randomly select
• operationalize

Sometimes, researchers will administer a(n) ________ to participants in the control group to control for the effects that participant expectation might have on the experiment.

• dependent variable
• independent variable
• statistical analysis

________ is to animal research as ________ is to human research.

• informed consent; deception
• deception; debriefing

Researchers might use ________ when providing participants with the full details of the experiment could skew their responses.

• informed consent

A person’s participation in a research project must be ________.

Before participating in an experiment, individuals should read and sign the ________ form.

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Class 9 Science Case Study Questions Chapter 2 Is Matter Around Us Pure

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Case study Questions in Class 9 Science Chapter 2 are very important to solve for your exam. Class 9 Science Chapter 2 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving  Class 9 Science Case Study Questions  Chapter 2 Is Matter Around Us Pure?

Join our Telegram Channel, there you will get various e-books for CBSE 2024 Boards exams for Class 9th, 10th, 11th, and 12th.

In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Is Matter Around Us Pure? Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science  Chapter 2 Is Matter Around Us Pure?

Case Study/Passage-Based Questions

Case Study 1: Akshita wants to separate the mixture of dyes constituting a sample of ink. She marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in the figure. The filter paper was removed when the water moved near the top of the filter paper.

(i) Identify the technique used by the Akshita. (a) Sedimentation (b) Filtration (c) Chromatography (d) Distillation

Answer: (c) Chromatography.

(ii) What would you expect to see, if the ink contains three different coloured components? (a) We will not see any band on the filter paper. (b) We would see three bands on the filter paper at various lengths. (c) We would see infinite bands on the filter paper. (d) We would see the single band on the filter paper.

Answer: (b) The components of the ink will travel with water and we would see three bands on the filter paper at various lengths.

(iii) An application where you can use this technique is: (a) To separate salt from sand (b) To separate the wheat from the husk (c) To separate oil from water (d) To separate drugs from the blood.

Answer: (d) To separate drugs from blood.

(iv) The above process is used for the separation of : (a) insoluble substances (b) single solute that dissolves in the soluble solvent. (c) solutes that dissolve in the same solvent. (d) solutes that dissolve in the different solvents.

Answer: (c) For the separation of those solutes that dissolve in the same solvent.

(v) What is chromatography? (a) It is an agricultural method to separate grains (b) A method to separate magnetic impurities from non-magnetic impurities

(c) The process of separating the suspended particles of an insoluble substance (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

Answer: (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

Case Study 2: A homogeneous mixture of two or more substances is called a true solution. it consists of solute and solvent. The particle size of the true solution is less than 1 nanometer. A suspension is a heterogeneous mixture in which the solute particle does not dissolve but remains suspended throughout the bulk of the medium. A colloid is a mixture that is actually heterogeneous but appears to be homogeneous as the particles are uniformly spread throughout the solution.

(i) which one of the following is most stable? 

A)True solution

B)Suspensions

D) both A and B

Answer: A)True solution

ii) which type of mixture can be separated by filtration? 

D)All of these

Answer: B)Suspensions

iii) which statement is incorrect about the Tyndall effect. *

A)True solution shows Tyndall effect

B)Suspensions show the Tyndall effect

C)Colloid show Tyndall effect

D)Both B and C show the Tyndall effect

Answer: A)True solution shows Tyndall effect

iv) Which is the correct order of stability of solution *

A) True < Colloid<Suspension

B)Colloid<Suspension<True

C)Colloid<True<Suspension

D)Suspension<Colloid<True

Answer: D)Suspension

Case Study 3:

Matter can be classified into two categories: pure substances and mixtures. Pure substances are made up of a single type of particle and cannot be separated into other substances by physical methods. They have definite and constant properties. On the other hand, mixtures are made up of two or more substances that are physically combined and can be separated into their individual components. Mixtures can be further classified into homogeneous and heterogeneous mixtures. Homogeneous mixtures are uniform in composition, meaning the components are evenly distributed throughout the mixture. Heterogeneous mixtures, on the other hand, have non-uniform composition with visible different parts. It is important to understand the nature of matter around us and differentiate between pure substances and mixtures to comprehend their properties and behavior.

What is the main characteristic of a pure substance? a) Made up of two or more substances b) Cannot be separated into other substances c) Has non-uniform composition d) Components are evenly distributed Answer: b) Cannot be separated into other substances

Which of the following is an example of a pure substance? a) Air b) Saltwater c) Gold d) Soil Answer: c) Gold

How are mixtures different from pure substances? a) Mixtures have definite and constant properties b) Mixtures are made up of a single type of particle c) Mixtures cannot be separated into other substances d) Mixtures are physically combined and can be separated Answer: d) Mixtures are physically combined and can be separated

Which type of mixture has a non-uniform composition? a) Homogeneous mixture b) Heterogeneous mixture Answer: b) Heterogeneous mixture

What is the primary reason for understanding the nature of matter around us? a) To separate mixtures into pure substances b) To comprehend the properties and behavior of matter c) To classify mixtures into homogeneous and heterogeneous d) To identify the components in pure substances Answer: b) To comprehend the properties and behavior of matter

Hope the information shed above regarding Case Study and Passage Based Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure? with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 9 Science Is Matter Around Us Pure? Case Study and Passage-Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible By Team Study Rate

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Chapter 2 Research Methods

10th - 12th grade, social studies.

12 questions

Introducing new   Paper mode

No student devices needed.   Know more

In what type of study does a researcher study an individual subject in depth?

Naturalistic observation

Laboratory observation

What does it mean if two variables have a positive correlation?

As one variable increases, so does the other

As one variable increases, the other decreases

The correlation between the two variables is 0

The correlation between the two variables is greater than 1.0

Which of the following is a research method that allows a researcher to get information about a large number of subjects relatively inexpensively and easily?

• 4. Multiple Choice Edit 45 seconds 1 pt This research method is a measure of the extent to which two variables change together, and thus of how well either variable predicts the other Correlational Experiments Case Study Survey Observational
• 5. Multiple Choice Edit 45 seconds 1 pt Which ethical principle requires that at the end of the study participants be told about the true purpose of the research? Institutional Review Board Approval Informed Consent Confidentiality Debriefing
• 6. Multiple Choice Edit 45 seconds 1 pt What must a researcher do to fulfill the ethical principle of informed consent? Keep information about participants confidential Allow participants to choose whether to take part Provide participants with a pre-experimental explanation of the study Protect participants from potential harm
• 7. Multiple Choice Edit 45 seconds 1 pt This is a method of research where an investigator manipulates one or more factors (independent variables) to observe the effect on some behavior or mental process (the dependent variable). Experiments Case Study Survey Observational Correlational
• 8. Multiple Choice Edit 45 seconds 1 pt The disadvantage of this method of descriptive research is that the data is limited to only answering the question(s) asked. These limitations lead to biases, ambiguous conclusions, and low participation rates among research populations. Survey Observational Correlational Experiments Case Study
• 9. Multiple Choice Edit 45 seconds 1 pt A frequency distribution is a way to present data visually in a table depicts a correlation between two variables using a histiogram is the same thing as a scattergram typically lists the frequency of each score on the horizontal axix
• 10. Multiple Choice Edit 45 seconds 1 pt You psychology professor wants to describe the average score on your first psychology test.  Which measure of central tendency is your professor most likely to use?  mean median mode  harmonic mean

When scores are "bunched up"in the center of a distribution, the

mean will be relatively low

standard deviation will be relatively low

correlation coefficiaent will be a negative number

standard deviation will be relatively high

• 12. Multiple Choice Edit 45 seconds 1 pt The symmetric, bell shaped curve that represents the pattern in which many human characteristics are dispersed in the population is known as scatter plot normal distribution frequency polygon histogram

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CHAPTER 2] Case Study: Collaboration and Innovation at Procter and Gamble

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