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Class 9 Mcq

Class 9 Science के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ScienceWhat is the chemical formula of water?Class 9Atomic Foundations of MatterChemical formulaeLevel 1Easy ScienceIn an experiment average plant growth increased as fertilizer amount increased but soil acidity was not measured. Which is the most scientific conclusion?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA student always tests low temperatures first and high temperatures last. The apparatus gradually warms over time. Which improvement will reduce the order effect?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceLarge and small limestone pieces are used to test the effect of particle size on reaction rate. What should be equal for a fair comparison?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceIn which option have the independent and controlled variables been incorrectly exchanged?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA student says that it is always possible to keep every controlled variable exactly identical. Which evaluation is most appropriate?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceIn an experiment on the effect of temperature on plant growth the chambers at different temperatures also have different light levels. What is the best solution?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceOnly one measurement was taken at each value of the independent variable. Which change would make the results more reliable?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA student changes the distance between a magnet and an iron nail and measures attraction force. Which factor should be controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard SciencePlant growth is measured under different colours of light. What type of independent variable is light colour?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceAn experiment has a continuous independent variable. What does this mean?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceOne group uses a new study method and another uses the old method but they take different test papers. Which improvement is most appropriate?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhy must pressure be kept constant while measuring gas volume at different temperatures?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceIf a controlled variable gradually changes during an experiment what type of error may appear in the results?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceDistance between a plant and lamp is changed to alter light intensity. How should the independent variable be recorded more accurately?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceIn which experiment is the dependent variable operationally defined most clearly?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceA student tests the effect of soil moisture on earthworm number. If all samples are collected only after rainfall which external variable remains poorly controlled?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceIn an experiment plant growth is measured at five different fertilizer amounts. What is the purpose of using three plants at each amount?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhich statement correctly distinguishes a controlled variable from a control group?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard ScienceWhat is the main advantage of recording the initial resting pulse rate while testing the effect of exercise duration on pulse rate?Class 9Exploration: Entering the World of Secondary ScienceVariables in an experimentLevel 11Hard