ASPhysicsOCRExam Questions1. Development of Practical Skills in Physics1.1 Experimental Design

Experimental Design (OCR AS Physics)

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1.1 Experimental Design

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1.1 Experimental Design

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1
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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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2
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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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3
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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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    4
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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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    5
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    A student investigates the behavior of mercury inside a narrow tube, as shown in Figure 5

    1-1-mcq-m-q5-ocr-al-physics

    Figure 5

    It has been suggested that the relationship between L and x is as follows

    L equals fraction numerator 4 sigma over denominator x rho g end fraction

    A graph is plotted between L (y-axis) and  (x-axis).

    What would be the equation of the gradient?

    • fraction numerator sigma over denominator x rho g end fraction

    • fraction numerator 4 sigma over denominator g end fraction

    • fraction numerator 4 sigma over denominator x rho g end fraction

    • fraction numerator 4 sigma over denominator rho g end fraction

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    1
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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 V subscript a t o m end subscript over V subscript n u c l e u s end subscript?

    • 1 × 108

    • 1 × 104

    • 1 × 1012

    • 1 × 10−4

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    2
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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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    3
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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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    4
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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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