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Class 9 · Science · Medium
→Which is the most appropriate controlled variable in an experiment on the temperature of coloured surfaces?
Class 9 · Science · Medium
→A student places surfaces of different colours in sunlight and measures temperature. What type of variable is surface colour?
Class 9 · Science · Medium
→In a detergent experiment foam height is measured in a different container each time. What problem may occur?
Class 9 · Science · Medium
→A student adds different amounts of detergent and measures foam height. Which variable should be controlled?
Class 9 · Science · Medium
→Why may measuring the time for ten oscillations be more useful than timing one oscillation in a pendulum experiment?
Class 9 · Science · Medium
→A student measures the time for ten oscillations of pendulums of different lengths. Which is the independent variable?
Class 9 · Science · Medium
→What problem occurs if reactant amounts are not kept the same in a reaction-rate experiment?
Class 9 · Science · Medium
→A student measures the time taken for a reaction to finish at different temperatures. What is reaction time?
Class 9 · Science · Medium
→Why should the duration be kept the same in an experiment on leaf area and water loss?
Class 9 · Science · Medium
→A student measures water loss from leaves with different surface areas. Which is the independent variable?
Class 9 · Science · Medium
→A student investigates how fan speed affects cloth drying time. What happens if the amount of water in the cloth differs?
Class 9 · Science · Medium
→Why is it necessary to release the car from the same point each time in a ramp experiment?
Class 9 · Science · Medium
→In the ramp experiment what type of variable is the time taken by the car to reach the bottom?
Class 9 · Science · Medium
→A student sets a ramp at different angles and measures the time taken by a car to reach the bottom. What type of variable is ramp angle?
Class 9 · Science · Medium
→In an experiment on exercise and pulse rate what additional variable may affect the result if different students are used?
Class 9 · Science · Medium
→A student measures pulse rate after exercising for different durations. Which is the dependent variable?
Class 9 · Science · Medium
→Why is it necessary to keep the bulb type the same in an experiment on voltage and brightness?
Class 9 · Science · Medium
→A student measures bulb brightness at different voltages. What is the independent variable?
Class 9 · Science · Medium
→Why should the initial size of potato pieces be kept the same in the salt-solution experiment?
Class 9 · Science · Medium
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