Q1. Which of the following best defines a hypothesis in the context of the scientific method?
Basics of Everyday Science: RAS Prelims MCQs
200 RAS Prelims MCQs on the basics of everyday science test the scientific method, the laws of motion, chemical bonding and the cell theory. The questions use daily-life examples, such as the recoil of a gun and the orbit of a satellite, and the explanations give the principle behind each example so that you can reason out similar questions.
Practice questions based on the RPSC RAS Prelims syllabus. They follow the exam pattern but are not past-paper questions.
Showing 1–10 of 200 questions
Q2. In a controlled scientific experiment, what is the primary purpose of the control group?
Explanation
The control group acts as a vital reference point in scientific research. By remaining unexposed to the experimental variable, it allows investigators to measure the exact influence of the independent variable on the test group. This comparison ensures that observed changes result from the specific manipulation rather than external environmental factors or chance occurrences within the study environment.
Q3. Which logical process involves drawing a general conclusion from specific observations?
Explanation
Inductive reasoning involves synthesizing specific instances to form a broad generalization. This logical approach observes patterns in data to derive probable conclusions about larger populations or universal principles. While the resulting conclusions are not guaranteed to be true, they provide essential predictive models that guide further scientific exploration and help in establishing broader theories based on recorded evidence.
Q4. What is the fundamental difference between a scientific theory and a scientific law?
Explanation
Scientific laws provide concise descriptions of natural phenomena, often expressed mathematically, to state what happens under specific conditions. Conversely, scientific theories offer comprehensive, evidence-based explanations of how or why these phenomena occur. While laws summarize observations, theories integrate multiple hypotheses and laws to provide a deeper understanding of the underlying mechanisms driving the natural world and its processes.
Q5. Consider the following statements regarding the scientific method:
I. Observation often precedes the formulation of a hypothesis.
II. A valid experiment must be reproducible by other independent scientists.
III. If an experiment contradicts a hypothesis, the data must be discarded.
Which of the above statement(s) is/are correct?
I. Observation often precedes the formulation of a hypothesis.
II. A valid experiment must be reproducible by other independent scientists.
III. If an experiment contradicts a hypothesis, the data must be discarded.
Which of the above statement(s) is/are correct?
Explanation
Effective scientific methodology typically starts with careful observation, which then informs the development of a testable hypothesis. For results to gain credibility, the experimental process must be reproducible by others to confirm accuracy. If data contradicts the hypothesis, researchers must refine or replace the hypothesis rather than discard the data, as unexpected results are critical for scientific advancement.
Q6. The process of peer review in scientific research is primarily intended to:
Explanation
Peer review serves as a rigorous quality control mechanism in academic publishing. Independent experts in the same field critically evaluate a researcher’s methodology, data interpretation, and original contributions. This scrutiny ensures that only studies with high technical accuracy and logical consistency are published, thereby maintaining the integrity of the scientific record and preventing the spread of flawed or erroneous information.
Q7. A variable that is kept constant throughout a scientific experiment is known as a:
Explanation
Control variables are external factors purposefully kept unchanged throughout an experiment to ensure a fair test. By neutralizing these potential influences, researchers can confidently attribute any observed changes in the dependent variable solely to the manipulation of the independent variable. Maintaining constant conditions is essential for isolating specific cause-and-effect relationships and enhancing the overall validity and reliability of experimental results.
Q8. Which of the following steps typically occurs last in the scientific method?
Explanation
Sharing findings with the scientific community represents the concluding stage of the scientific method. This process involves publishing research in peer-reviewed journals or presenting at conferences, allowing other scientists to evaluate, replicate, and build upon the work. Transparent communication is vital for collective knowledge advancement, as it subjects findings to public scrutiny and enables the integration of new data into existing knowledge.
Q9. Identify the incorrect statement about scientific models.
Explanation
Scientific models are simplified representations used to understand complex systems or predict future behaviors. They can be physical, mathematical, or conceptual tools that highlight essential features while ignoring irrelevant details. Because they are approximations, they are not exact replicas of reality. Models are dynamic and undergo constant revision or replacement as more accurate data and sophisticated technological observations become available.
Q10. When a researcher manipulates one factor to see its effect on another, the manipulated factor is called the:
Explanation
The independent variable is the specific factor that a researcher changes or controls to observe its effects. It acts as the hypothesized cause within an experiment. By systematically varying this factor while keeping others constant, scientists can measure how it influences the outcome, known as the dependent variable. This manipulation is fundamental to establishing clear relationships and understanding how different elements interact.Answer key for these questions
| Q | Correct answer |
|---|---|
| 1 | (b) A tentative, testable explanation for an observed phenomenon |
| 2 | (a) To provide a standard baseline for comparison with the test group |
| 3 | (c) Inductive reasoning |
| 4 | (d) A law describes what happens, while a theory explains how or why it occurs |
| 5 | (a) I and II only |
| 6 | (b) Evaluate the overall validity, quality, and originality of papers before publication |
| 7 | (d) Control variable |
| 8 | (d) Communicating the results |
| 9 | (c) They are exact replicas of reality with no simplifications |
| 10 | (a) Independent variable |
Key facts from Basics of Everyday Science
- Inductive reasoning draws a general conclusion from specific observations; a control variable is kept constant in an experiment; communicating the results is the last step of the scientific method.
- Newton’s second law relates force, mass and acceleration; the recoil of a gun illustrates the third law.
- Momentum is the product of mass and velocity; impulse is equal to the change in momentum.
- A satellite in uniform circular orbit is held by the centripetal force provided by gravity.
- Water (H₂O) and N₂ show covalent bonding; sodium chloride, MgO and CaF₂ are ionic.
- The classical cell theory does not say that all cells have a true nucleus.
Frequently asked questions
How many RAS Prelims practice MCQs are there on Basics of Everyday Science?
This page has 200 practice MCQs on Basics of Everyday Science (Science and Technology). Each has the correct answer, and most have an explanation.
What is the product of mass and velocity called?
Momentum. Newton’s second law says that the rate of change of momentum is equal to the force applied, and impulse is equal to the change in momentum of a body.
Which law explains the recoil of a gun?
Newton’s third law of motion. The gun pushes the bullet forward, and the bullet pushes the gun back with an equal and opposite force, which is felt as recoil.
What holds a satellite in a circular orbit?
The centripetal force provided by gravity. The Earth’s pull keeps changing the direction of the satellite’s velocity so that it moves in a circle and does not fly off in a straight line.