The radius of an atom is 0.1 nm and the radius of a nucleus is 0.01 pm. The volume of the atom and nucleus is written Vatom and Vnucleus respectively.
What is the value of the ratio ?
1 × 108
1 × 104
1 × 1012
1 × 10−4
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The radius of an atom is 0.1 nm and the radius of a nucleus is 0.01 pm. The volume of the atom and nucleus is written Vatom and Vnucleus respectively.
What is the value of the ratio ?
1 × 108
1 × 104
1 × 1012
1 × 10−4
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An experiment was conducted where a monochromatic light was shone at varying angles on an air-glass boundary. The results were used to determine the critical angle C of glass.
The table below shows the recordings of the angle of incidence i and the angle of reflection r.
Angle of incidence, i / ° |
Angle of refraction, r / ° |
|
Reading 1 |
60 |
40 |
Reading 2 |
66 |
40 |
Reading 3 |
63 |
31 |
Mean |
63 |
37 |
Given that the known value for the refractive index n of glass is 1.50, which one of the following statements is true?
The results give an accurate measurement for the critical angle C
The results are precise
The dependent variable is the critical angle
The independent variable is the angle of refraction
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An experiment is conducted to determine the specific heat capacity of a solid copper block. The copper block is attached to a voltmeter, ammeter and power supply. A thermometer is inserted inside the block and time intervals are recorded during the experiment.
Which statement is true?
The independent variable is time and the dependent variable is voltage
The dependent variable is time, the independent variables are voltage, current and temperature, and the control variable is the power from the supply
The independent variable is the work done by the power supply, the dependent variable is temperature, and the control variable is the power from the supply
The independent variable is the power from the supply, the dependent variables are voltage and temperature, and the control variable is time
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An experiment is performed to determine the resistivity of a single thin wire connected to a constant power supply.
Which of the following is true?
A metre ruler is the best tool to determine the thickness of the wire
Repeating the experiment with several lengths of wire will reduce systematic error
Safety goggles should be worn in case the wire gets too hot
The independent variable is the length of the wire
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Which variables are to be identified in designing an experiment:
Independent Variable and Dependent Variable
Dependent Variable and Controlled Variable
Controlled Variable and Independent Variable
Independent Variable, Dependent Variable and Controlled Variable
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When conducting an experiment to investigate the relationship between the initial horizontal velocity (v) and the horizontal distance traveled (x) by a metal ball in projectile motion, which of the following is an essential aspect of experimental handling to ensure accuracy and safety?
Wearing a lab coat and safety goggles
Using a calibrated measuring tape
Maintaining a clear and unobstructed landing area
Observing the experiment from a distance with binoculars
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Four students each made a series of measurements of density of water ρwater .
Which sets of results could be described as precise but not accurate?
|
Results , kg m−3 |
A |
960 950 900 910 |
B |
997.1 996 996.9 997 |
C |
800 800.1 801.1 799 |
D |
800 600 500 400 |
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Which reduces the systematic error in the measurement?
Zeroing a digital caliper before taking a measurement
Using a laser rangefinder to measure the length from a distance
Comparing measurements from a steel ruler at different temperatures
Measuring an object's length multiple times and calculating the average
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A student investigates the behavior of mercury inside a narrow tube, as shown in Figure 5
Figure 5
It has been suggested that the relationship between L and x is as follows
A graph is plotted between L (y-axis) and (x-axis).
What would be the equation of the gradient?
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