Biophysics

Question 1

Scalar quantity

Answer 1

– a physical quantity described by a single number eg. time, temperature, mass, density, electric charge.

Question 2

Vector quantity

Answer 2

Vector quantity– a physical quantity described by both magnitude and direction eg. the motion of an aeroplane, displacement, position, velocity, acceleration, force.

Question 3

Is distance a vector or a scalar

Answer 3

Scalar

Question 4

What is displacement and is it a vector or a scalar

Answer 4

Displacement represents a change in position (between start and finish points in a defined interval). It is a VECTOR

Question 5

what is the unit of measure for displacement?

Answer 5

metres

Question 6

Is a average velocity a vector or a scalar?

Answer 6

Vector

Question 7

Is average speed a vector or a scalar?

Answer 7

Scalar

Question 8

What is Velocity

Answer 8

Velocity is the rate at which displacement changes

Question 9

What is Acceleration

Answer 9

Acceleration is the rate at which velocity

Question 10

Uniform acceleration

Answer 10

If the acceleration is constant then velocitytime graph is a straight line. (The velocity changes consistently with time).

Question 11

What dose GPS stand for??

Answer 11

= Global Positioning System, is an

Question 12

Sources of error in GNSS

Answer 12

Satellite clocks and orbit errors – ie the satelites aren’t exactly where we think they are and their clocks are out of sync with the receivers. • Ionospheric and tropospheric delays – the signal travels slower than we think • Receiver’s environment – (multipath- signal bounces off objects on way to receiver hence path isn’t a straight line • Satellite constellation – Even when you get the range right, the small angles between satellites increases the error of the position fix.

Question 13

What are Conductors and an example of it?

Answer 13

Conductors allow flow of charge (electrons) easily (eg metals)

Question 14

What are Insulators and an example of it?

Answer 14

Insulators do not allow flow of charge • (eg glass, wood)

Question 15

Ohm’s Law

Answer 15

• Predicts the relationship between voltage, current and resistance across a segment

Question 16

What is peak to peak

what is ampiltude

what is a peoird

Answer 16

Question 17

What are Wavelength and Amplitude

Answer 17

Question 18

What are Transverse wave

Answer 18

Transverse wave – particles oscillate at right angles to direction of waves

Question 19

What are Longitudinal wave? and an exmaple

Answer 19

•Longitudinal wave - particles oscillate along the direction of the waves

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Question 20

Scientific notation is used to render a large or small number into a form that is readily manageable in calculations. The mass of a particular boulder is 148,321 kg. Written in scientific notation, this mass is (a) 148.321 kg

(b) 1.48 kg
(c) 1.48 x 10-5 kg
(d) 1.48 x 105 kg

Answer 20

(d) 1.48 x 105 kg

Question 21

Which of the following is a vector ?

(a) mass
(b) time
(c) velocity
(d) speed

Answer 21

(c) velocity

Question 22

A person fires a rifle at a nearby target but completely misses. At the same time a person standing beside the shooter, drops a similar projectile at the same instant the rifle is fired, and from the same height at which the rifle is positioned. The fired projectile should hit the ground in the distance

(a) at the same time as the projectile dropped by the nearby observer
(b) in half the time it takes for the dropped projectile to hit the ground
(c) in twice the time it takes for the dropped projectile to hit the ground
(d) none of the above.

Answer 22

(a) at the same time as the projectile dropped by the nearby observer

Question 24

Electric current is

(a) the flow of electric charge
(b) the presence of static (stationary) electric charge
(c) the absence of electric charge
(d) the resistance of an object to the flow of electric charge.

Answer 24

(a) the flow of electric charge

Question 25

Select the correct set of information (a) Electric current is measured in Volts, Potential Difference in Amperes and Resistance in Ohms (b) Electric current measured in Amperes, Potential Difference in Volts and Resistance in Ohms (c) Electric current measured in Amperes, Potential Difference in Ohms and Resistance in Volts (d) Electric current measured in Ohms, Potential Difference in Volts and Resistance in Amperes

Answer 25

(b) Electric current measured in Amperes, Potential Difference in Volts and Resistance in Ohms

Question 26

Select the correct set of information (a) An ammeter is connected in parallel with the conductor you are trying to test. (b) A voltmeter is connected in series with the component you are trying to test the potential difference across. (c) A voltmeter has a large internal resistance to limit the current flowing out from the circuit you are trying to test into the meter itself. (d) In order to test the electrical resistance of a component, it is ok to leave the component connected, in-situ, in the circuit.

Answer 26

(c) A voltmeter has a large internal resistance to limit the current flowing out from the circuit you are trying to test into the meter itself.

Question 27

Consider three sources of electrical power i. Battery, ii. Solar, and iii. Mains power. Which of the following combinations is correct (a) i and ii are both dc (b) i and iii are both ac (c) ii and iii are both ac (d) i and ii are both ac.

Answer 27

(a) i and ii are both dc

Question 28

Which examples below DOES NOT involve a transverse wave ? (a) Surfing (b) the sound of a distant voice (c) the heat from a nearby fire (d) the light from a spotlight

Answer 28

(b) the sound of a distant voice

Question 29

Which of the following combination of characteristics is TRUE in relation to sound waves (a) Sound waves are longitudinal waves and can travel through a vacuum (b) The frequency of sound relates to its pitch and amplitude relates to its 'loudness‘ (c) The speed of sound in air is 3 x 10 8 m s-1 and sound waves can be easily overtaken by fast-moving aircraft (d) Sound waves travel slower in water than air and their speed does not change with changing temperature

Answer 29

(b) The frequency of sound relates to its pitch and amplitude relates to its 'loudness‘

Question 30

Which of the following statements is FALSE (a) Light waves travel in a straight line but can bend when travelling through a change in refractive index (b) The refractive index of a medium is determined by comparing the speed of light in it with that in a vacuum (c) Light travels faster in an optically dense medium (for example glass) compared to a vacuum (d) The index of refraction of materials is wavelengthdependent and results in the splitting of light into its component wavelengths as when it passes through a glass prism

Answer 30

(c) Light travels faster in an optically dense medium (for example glass) compared to a vacuum

Question 31

Light of a particular colour has a specific wavelength, and frequency. For light of a frequency 5.46 x 1014 Hz, which option below is the correct one. (a) Wavelength 480 x 10-9 m, colour blue (b) Wavelength 550 x 10-9 m, colour green (c) Wavelength 550 x 10-9 m, colour orange (d) Wavelength 480 x 10-9 m, colour green

Answer 31

(b) Wavelength 550 x 10-9 m, colour green

Question 32

Light of wavelength 650 nm is coloured (a) Violet (b) Blue (c) Green (d) red

Answer 32

(d) red