Junior high Natural Sciences

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Question 50: Given the following forms of energy: Kinetic energy of an object, energy of blowing wind, light energy, electrical energy. Which energy group do these energies belong to?

Question 50: Given the following forms of energy: Kinetic energy of an object, energy of blowing wind, light energy, electrical energy. Which energy group do these energies belong to? A. Energy storage group B. Energy group associated with motion C. Thermal energy group D. Negative energy group Kinetic energy of objects, energy of blowing wind, …

Question 50: Given the following forms of energy: Kinetic energy of an object, energy of blowing wind, light energy, electrical energy. Which energy group do these energies belong to? Read More »

Question 34: We recognize the power from the electrical outlet supplying the computer through the expression:

Question 34: We recognize the power from the electrical outlet supplying the computer through the expression: A. Light B. Sound C. Heat emitted by the computer D. All 3 answers above We recognize the power from the electrical outlet supplying the computer through the expression: – Light from the computer screen, light from the signal …

Question 34: We recognize the power from the electrical outlet supplying the computer through the expression: Read More »

Question 33: Choose the correct statement. The form of energy produced by the motion of an object that is:

Question 33: Choose the correct statement. The form of energy produced by the motion of an object that is: A. Kinetic energy B. Potential energy C. Heat energy D. Light energy Every moving object has kinetic energy such as a rotating propeller, a car moving on the road, a rolling ball, etc. The answer to …

Question 33: Choose the correct statement. The form of energy produced by the motion of an object that is: Read More »

Question 1: Choose the correct answer to the following question: How can two substances be separated from a mixture of iron and copper powder?

Question 1: Choose the correct answer to the following question: How can two substances be separated from a mixture of iron and copper powder? A. Listen, filter B. Dissolve in water C. Use a magnet to attract D. All is correct ANSWER Iron is attracted to a magnet and copper is not. =============== Go to …

Question 1: Choose the correct answer to the following question: How can two substances be separated from a mixture of iron and copper powder? Read More »

Question 2: Choose the correct answer to the following question: What is the most appropriate way to separate salt from seawater?

Question 2: Choose the correct answer to the following question: What is the most appropriate way to separate salt from seawater? A. Let the salt settle down and then decant the water B. Evaporation C. Distillation D. Filter The answer is NO Currently, salt is mainly produced by evaporating sea water to obtain crystallized salt. …

Question 2: Choose the correct answer to the following question: What is the most appropriate way to separate salt from seawater? Read More »

Question 3: Choose the correct answer to the following question: Can the mixture separate substances when the mixture is added to water, then stirred thoroughly and filtered?

Question 3: Choose the correct answer to the following question: Can the mixture separate substances when the mixture is added to water, then stirred thoroughly and filtered? A. Coal and iron powder B. Limestone powder and table salt C. Vinegar and alcohol D. Sugar and salt The answer is NO – When limestone powder and …

Question 3: Choose the correct answer to the following question: Can the mixture separate substances when the mixture is added to water, then stirred thoroughly and filtered? Read More »

Question 4: Choose the correct answer to the following question: Know that well water often contains many impurities. To remove impurities, people put well water into the filter tank, the bottom of the tank is lined with layers of fine sand, gravel and charcoal. The water flowing through these layers will be clearer. Which of the following statements is not correct?

Question 4: Choose the correct answer to the following question: Know that well water often contains many impurities. To remove impurities, people put well water into the filter tank, the bottom of the tank is lined with layers of fine sand, gravel and charcoal. The water flowing through these layers will be clearer. Which of …

Question 4: Choose the correct answer to the following question: Know that well water often contains many impurities. To remove impurities, people put well water into the filter tank, the bottom of the tank is lined with layers of fine sand, gravel and charcoal. The water flowing through these layers will be clearer. Which of the following statements is not correct? Read More »

Question 1: Choose the correct answer to the following question: The extraction funnel can be used to separate substances in which mixture?

Question 1: Choose the correct answer to the following question: The extraction funnel can be used to separate substances in which mixture? A. Wheat flour mixed in water B. Cooking oil and water C. Wine and water D. Sand mixed in water The answer is NO The device above is a separating funnel, which can …

Question 1: Choose the correct answer to the following question: The extraction funnel can be used to separate substances in which mixture? Read More »

Question 2: Choose the correct answer to the following question: What are the main effects of wearing a mask?

Question 2: Choose the correct answer to the following question: What are the main effects of wearing a mask? A. Separation of carbon dioxide from inhaled air B. Separation of oxygen from inhaled air C. Separation of smoke and dust from inhaled air D. Separation of water vapor from inhaled air ANSWER Wearing a mask …

Question 2: Choose the correct answer to the following question: What are the main effects of wearing a mask? Read More »

Question 3: Choose the correct answer to the following question: In case of spilling cooking oil into water, which method do we use to separate cooking oil from water?

Question 3: Choose the correct answer to the following question: In case of spilling cooking oil into water, which method do we use to separate cooking oil from water? A. She’s exhausted B. Extraction C. Filter D. Using a centrifuge The answer is NO Use extraction method to separate cooking oil from water because cooking …

Question 3: Choose the correct answer to the following question: In case of spilling cooking oil into water, which method do we use to separate cooking oil from water? Read More »