Science quiz with easy and average level questions on chemistry and physical science.
A multiple-choice quiz with "EASY" and "AVERAGE" sections covering basic chemistry and science concepts, including acids, elements, microscopes, solvents, and metal properties.
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Show Answer Key & Explanations
Step-by-step solution for: Science Quiz Bee Grade 7 | PDF | Carbon | Chemical Elements
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Show Answer Key & Explanations
Step-by-step solution for: Science Quiz Bee Grade 7 | PDF | Carbon | Chemical Elements
Let's go through each question one by one and solve them with explanations.
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1. Acids are found in many common chemicals, including foods. Acid taste:
A. sour
B. sweet
C. soapy
D. salty
✔ Correct answer: A. sour
Explanation: Acids have a sour taste. For example, citric acid in lemons or vinegar (acetic acid) tastes sour. This is a characteristic property of acids.
---
2. Here we found the complete list of elements.
A. periodic time
B. periodic table
C. specific table
D. compound elements
✔ Correct answer: B. periodic table
Explanation: The periodic table is a tabular arrangement of all known chemical elements, organized by atomic number, electron configuration, and recurring chemical properties. It contains the complete list of elements.
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3. It is an instrument used to magnify the image of objects that are too small to be seen by naked eyes.
A. telescope
B. microscope
C. seismograph
D. eyeglass
✔ Correct answer: B. microscope
Explanation: A microscope is designed to magnify tiny objects like cells or bacteria. A telescope is for distant objects (like stars), a seismograph measures earthquakes, and eyeglasses correct vision.
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4. It is considered as universal solvent.
A. NaCl
B. blood
C. oxygen
D. water
✔ Correct answer: D. water
Explanation: Water is called the "universal solvent" because it can dissolve more substances than any other liquid. It dissolves ions and polar molecules effectively due to its polarity.
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5. When a litmus paper turns blue from a given solution it is a _________.
A. dilute
B. polar
C. base
D. acid
✔ Correct answer: C. base
Explanation: Litmus paper is a pH indicator. Blue litmus paper turns red in acidic solutions, while red litmus paper turns blue in basic (alkaline) solutions. So, if the paper turns blue, the solution is basic.
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1. It is the characteristic of metal that can be pounded and shaped into thin sheets without breaking.
A. ductility
B. dull
C. malleability
D. brittle
✔ Correct answer: C. malleability
Explanation: Malleability refers to the ability of a material (especially metals) to be hammered or rolled into thin sheets without breaking. Ductility is the ability to be drawn into wires.
---
2. Which of the following object is the hardest?
A. talc
B. topaz
C. diamond
D. quartz
✔ Correct answer: C. diamond
Explanation: On the Mohs scale of mineral hardness, diamond is the hardest natural substance, rated at 10. Talc is the softest (1), quartz is 7, and topaz is 8.
---
3. Which of the following methods is essential in purifying water?
A. distillation
B. chromatography
C. filtration
D. magnetism
✔ Correct answer: C. filtration
Explanation: Filtration is a key method in water purification. It removes suspended particles, sediments, and impurities by passing water through a filter. While distillation (boiling and condensing) also purifies water, filtration is more commonly used in large-scale systems. Chromatography is for separating mixtures, and magnetism is not relevant here.
---
#### EASY
1. A. sour
2. B. periodic table
3. B. microscope
4. D. water
5. C. base
#### AVERAGE
1. C. malleability
2. C. diamond
3. C. filtration
Let me know if you'd like these explained in simpler terms or need help with similar questions!
---
EASY
1. Acids are found in many common chemicals, including foods. Acid taste:
A. sour
B. sweet
C. soapy
D. salty
✔ Correct answer: A. sour
Explanation: Acids have a sour taste. For example, citric acid in lemons or vinegar (acetic acid) tastes sour. This is a characteristic property of acids.
---
2. Here we found the complete list of elements.
A. periodic time
B. periodic table
C. specific table
D. compound elements
✔ Correct answer: B. periodic table
Explanation: The periodic table is a tabular arrangement of all known chemical elements, organized by atomic number, electron configuration, and recurring chemical properties. It contains the complete list of elements.
---
3. It is an instrument used to magnify the image of objects that are too small to be seen by naked eyes.
A. telescope
B. microscope
C. seismograph
D. eyeglass
✔ Correct answer: B. microscope
Explanation: A microscope is designed to magnify tiny objects like cells or bacteria. A telescope is for distant objects (like stars), a seismograph measures earthquakes, and eyeglasses correct vision.
---
4. It is considered as universal solvent.
A. NaCl
B. blood
C. oxygen
D. water
✔ Correct answer: D. water
Explanation: Water is called the "universal solvent" because it can dissolve more substances than any other liquid. It dissolves ions and polar molecules effectively due to its polarity.
---
5. When a litmus paper turns blue from a given solution it is a _________.
A. dilute
B. polar
C. base
D. acid
✔ Correct answer: C. base
Explanation: Litmus paper is a pH indicator. Blue litmus paper turns red in acidic solutions, while red litmus paper turns blue in basic (alkaline) solutions. So, if the paper turns blue, the solution is basic.
---
AVERAGE
1. It is the characteristic of metal that can be pounded and shaped into thin sheets without breaking.
A. ductility
B. dull
C. malleability
D. brittle
✔ Correct answer: C. malleability
Explanation: Malleability refers to the ability of a material (especially metals) to be hammered or rolled into thin sheets without breaking. Ductility is the ability to be drawn into wires.
---
2. Which of the following object is the hardest?
A. talc
B. topaz
C. diamond
D. quartz
✔ Correct answer: C. diamond
Explanation: On the Mohs scale of mineral hardness, diamond is the hardest natural substance, rated at 10. Talc is the softest (1), quartz is 7, and topaz is 8.
---
3. Which of the following methods is essential in purifying water?
A. distillation
B. chromatography
C. filtration
D. magnetism
✔ Correct answer: C. filtration
Explanation: Filtration is a key method in water purification. It removes suspended particles, sediments, and impurities by passing water through a filter. While distillation (boiling and condensing) also purifies water, filtration is more commonly used in large-scale systems. Chromatography is for separating mixtures, and magnetism is not relevant here.
---
✔ Final Answers Summary:
#### EASY
1. A. sour
2. B. periodic table
3. B. microscope
4. D. water
5. C. base
#### AVERAGE
1. C. malleability
2. C. diamond
3. C. filtration
Let me know if you'd like these explained in simpler terms or need help with similar questions!
Parent Tip: Review the logic above to help your child master the concept of 7th grade science questions and answers.
