Chapter-1 The Wonderful World of Science — Online MCQ Test
SCIENCE · Grade 6 · CBSE(NCERT)
Practice Chapter-1 The Wonderful World of Science with a free chapter-wise online MCQ test.
This chapter covers: observation - experimentation - hypothesis.
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Chapter-1 The Wonderful World of Science — Important Questions & Answers
What is science?
- A. A systematic study of nature and natural phenomena through observation and experimentation
- B. A collection of random facts about the world
- C. Only the study of living things
- D. Knowledge that cannot be tested or verified
Answer: A. A systematic study of nature and natural phenomena through observation and experimentation
Science is defined as a systematic method of studying nature using observation, experimentation, and logical reasoning to understand natural phenomena.
Science is defined as a systematic method of studying nature using observation, experimentation, and logical reasoning to understand natural phenomena.
Which of the following is the first step in the scientific method?
- A. Conclusion
- B. Observation
- C. Experimentation
- D. Hypothesis
Answer: B. Observation
Observation is the foundation of scientific inquiry, where scientists carefully notice and record details about natural phenomena before forming hypotheses.
Observation is the foundation of scientific inquiry, where scientists carefully notice and record details about natural phenomena before forming hypotheses.
What is a hypothesis?
- A. A final proven fact
- B. A wild guess with no basis
- C. An educated guess or testable prediction based on observations
- D. A conclusion drawn after the experiment
Answer: C. An educated guess or testable prediction based on observations
A hypothesis is an informed prediction or proposed explanation based on limited evidence, which serves as a starting point for further investigation.
A hypothesis is an informed prediction or proposed explanation based on limited evidence, which serves as a starting point for further investigation.
Experimentation in science means ___________.
- A. Playing with materials randomly
- B. Testing a hypothesis under controlled conditions to gather data
- C. Reading books about science
- D. Making predictions without testing
Answer: B. Testing a hypothesis under controlled conditions to gather data
Experimentation is a controlled test designed to verify or refute a hypothesis by manipulating variables and observing outcomes under specific conditions.
Experimentation is a controlled test designed to verify or refute a hypothesis by manipulating variables and observing outcomes under specific conditions.
What does 'controlled variable' mean in an experiment?
- A. A factor that is intentionally changed
- B. A factor that is kept the same to ensure fair testing
- C. A factor that cannot be measured
- D. A factor that is observed but not recorded
Answer: B. A factor that is kept the same to ensure fair testing
Controlled variables are factors kept constant in an experiment to ensure that any observed changes result from the independent variable alone.
Controlled variables are factors kept constant in an experiment to ensure that any observed changes result from the independent variable alone.
A student observes that plants in a sunny window grow taller than plants in a dark corner. What should be the next step?
- A. Conclude that sunlight is necessary for plant growth
- B. Form a hypothesis about the role of sunlight in plant growth
- C. Stop observing and report the findings
- D. Change all growing conditions randomly
Answer: B. Form a hypothesis about the role of sunlight in plant growth
Based on this observation, the student should form a testable hypothesis (e.g., 'Sunlight promotes plant growth') to guide further experimentation.
Based on this observation, the student should form a testable hypothesis (e.g., 'Sunlight promotes plant growth') to guide further experimentation.
Compare observation and inference. Which statement is correct?
- A. Observation and inference are the same thing
- B. Observation is direct sensory information; inference is a conclusion based on observations
- C. Inference comes before observation in the scientific method
- D. Observations are less reliable than inferences
Answer: B. Observation is direct sensory information; inference is a conclusion based on observations
Observation involves gathering direct data through senses, while inference draws logical conclusions from those observations—they are distinct but complementary steps.
Observation involves gathering direct data through senses, while inference draws logical conclusions from those observations—they are distinct but complementary steps.
A student conducts an experiment on plant growth under different light conditions. Which data would be most useful for drawing a reliable conclusion?
- A. Observations recorded once at the end
- B. Measurements taken daily over several weeks with detailed records
- C. Opinions about which plants look healthier
- D. Estimates of plant height without measuring tools
Answer: B. Measurements taken daily over several weeks with detailed records
Frequent, systematic measurements over time provide comprehensive, quantitative data that supports reliable conclusions, unlike subjective opinions or single observations.
Frequent, systematic measurements over time provide comprehensive, quantitative data that supports reliable conclusions, unlike subjective opinions or single observations.
A medicine company claims their drug increases energy based on testimonials from satisfied customers. Why is this NOT a reliable scientific conclusion?
- A. Because customer satisfaction is always accurate
- B. Because testimonials lack controlled conditions and may reflect placebo effects or bias
- C. Because medicines never actually work
- D. Because there are too many customers
Answer: B. Because testimonials lack controlled conditions and may reflect placebo effects or bias
Testimonials are anecdotal evidence lacking scientific rigor; actual energy levels must be measured in controlled experiments with control groups to eliminate placebo effects.
Testimonials are anecdotal evidence lacking scientific rigor; actual energy levels must be measured in controlled experiments with control groups to eliminate placebo effects.
A botanist observes that flowers bloom at different times in different locations. She hypothesizes that 'Temperature determines the timing of flower blooms.' To properly test this hypothesis, which would be most challenging?
- A. Measuring flower bloom dates in different locations
- B. Recording temperature data from each location
- C. Controlling all variables except temperature in natural field conditions
- D. Analyzing the collected data statistically
Answer: C. Controlling all variables except temperature in natural field conditions
While measuring bloom dates and temperature is feasible, controlling all variables except temperature in natural environments is inherently difficult, making this a practical limitation in field science.
While measuring bloom dates and temperature is feasible, controlling all variables except temperature in natural environments is inherently difficult, making this a practical limitation in field science.