Apparatus identification, observation interpretation, lab procedure questions.
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Q1 · Experimental and Lab-based · EASY
A student is conducting an experiment to verify Ohm's law. She sets up a circuit with a resistor, ammeter, voltmeter, battery, rheostat and a key. To get multiple readings of current and voltage, which component should be adjusted?
Q2 · Experimental and Lab-based · MEDIUM
During a laboratory activity to study the action of salivary amylase on starch, a student sets up three test tubes: Test tube A contains starch solution + saliva at 37°C, Test tube B contains starch solution + saliva at 0°C, Test tube C contains starch solution + boiled saliva at 37°C. After 30 minutes, iodine solution is added to all tubes. Which test tube(s) will show blue-black colour with iodine?
Q3 · Experimental and Lab-based · HARD
A student wants to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. After getting a sharp image on the screen, she measures the distance between the mirror and screen as 12.0 cm. However, she realizes the mirror stand was 0.5 cm in front of the actual mirror pole. What is the correct focal length of the mirror?
Q4 · Experimental and Lab-based · MEDIUM
In an experiment to test the effect of fertilizer on plant growth, a student uses three identical pots with the same soil and plants. Pot A receives no fertilizer, Pot B receives 5g fertilizer, and Pot C receives 10g fertilizer. All pots are placed in different locations with varying light. What is the major flaw in this experimental design?
Q5 · Experimental and Lab-based · EASY
A student wants to determine which type of soil (sand, clay, or loam) retains water best. What should be measured after pouring equal amounts of water into each soil sample?