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A level Physics

Total questions: 70

Worksheet time: 1hrs 8mins

Name
Class
Date
1.
The diagram shows a circuit involving a photoelectric cell. When UV light is shone onto the metal cathode, electrons are emitted establishing a photocurrent.
Which of the following changes could cause the photocurrent to stop?
a)
Increasing the potential difference of the power supply.
b)
Increasing the frequency of the UV light.
c)
Increasing the intensity of the UV light.
d)
Changing the metal surface to one with a smaller work function.
2.
Light of a single wavelength is incident on a metal.  Electrons are released. The intensity of the light is then increased.
Which of the following changes occur?
a)
Rate of electron emission: increase.
Energy of electrons: increase.
b)
Rate of electron emission: decrease.
Energy of electrons: no change.
c)
Rate of electron emission: decrease.
Energy of electrons: increase.
d)
Rate of electron emission: increase.
Energy of electrons: no change.
3.
The photoelectric effect only occurs if the light shining on the metal is:
a)
coherent.
b)
above a minimum intensity.
c)
above a minimum frequency.
d)
above a minimum wavelength.
4.
The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
Plank's constant is determined by:
a)
the x-intercept.
b)
the y-intercept.
c)
the gradient.
d)
the area under the graph.
5.
The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The work function is determined by:
a)
the x-intercept.
b)
the y-intercept.
c)
the gradient.
d)
the area under the graph.
6.
The graph shows maximum kinetic energy of emitted electrons against frequency of incident light for a number of different metals.
The threshold frequency is determined by:
a)
the x-intercept.
b)
the y-intercept.
c)
the gradient.
d)
the area under the graph.
7.
Which statement about the photoelectric effect is correct?
a)
Electrons are emitted instantaneously.
b)
Electrons are not emitted below a certain wavelength.
c)
You can change the energy of the electrons by changing the intensity.
d)
Electron energy is independent of frequency.
8.
The following observations are made about the photoelectric effect:
1.   No electrons are emitted below the threshold frequency.
2.   Above the threshold frequency the energy of electrons depends on the frequency of the light.
3.   Increasing intensity increases the number of emitted electrons.
Which (if any) of these observations can be explained by a wave theory of light?
a)
All of them.
b)
1 and 2 only.
c)
3 only.
d)
None of them.
9.
The photoelectric effect is when:
a)
Electrons collide inside a metal to release photons.
b)
One incident metal electron releases one photon.
c)
One incident photon releases one electron from a metal.
d)
Photons are absorbed in to metal ions releasing electrons.
10.

What is Hookes law?

a)

Extension is directly proportional to length

b)

Extension is directly proportional to force applied

c)

Extension is inversly proportional to force applied

d)

Peter Pan isn't nice

11.

Denisty it measured in what units?

a)

kgm3kgm^3

b)

kg2mkg^2m

c)

kgm−3kgm^{-3}

d)

yardsinch\frac{yards}{inch}

12.

Tensile (a)   is force applied per cross sectional area

13.

Tensile (a)   is a measure of how to material stretches

14.

A brittle material is one which:

a)

Doesn't deform plastically but breaks when the stress is too high

b)

Deforms plastically

c)

Deforms elastically and will return to its original shape

d)

Deforms to a new shape with little force

15.

The elastic limit is the force above which a material will (a)   deform

16.

Area under a force-extension graph represents

(a)  

17.

What is Young's Modulus?

a)

StressStrain\frac{Stress}{Strain}

b)

StrainStress\frac{Strain}{Stress}

c)

FLΔLA\frac{FL}{\Delta LA}

d)

∞\sqrt{\infty}

18.

How do you find the Young's Modulus from a stress-strain graph?

a)

Area under the line

b)

Gradient of the line

c)

Integral of the line

d)

ΔxΔy\frac{\Delta x}{\Delta y}

19.

Which graph represents a wire which has plastically deformed?

a)

Left graph

b)

Right graph

20.

2 points on a progressive wave are 1/3 of a wavelength apart. The distance between the two points is 2cm. If the speed of the wave is 10 ms-1 what is the frequency of the wave?

a)

5Hz

b)

20Hz

c)

167Hz

d)

1500Hz

21.

Which of the following waves cannot be polarized?

a)

Visible light

b)

Radio waves

c)

Ultrasonic

d)

Gamma

22.

A guitar string of length 80cm vibrates with a third harmonic frequency of 305Hz. What is the wavelength of the wave?

a)

244cm

b)

53.3cm

c)

16.2cm

d)

3.80cm

23.

What is the approximate phase difference between the waves shown?

a)

2π

b)

3 π/2

c)

π

d)

π/2

24.

When comparing X rays with visible light, which statement is correct?

a)

X-rays travel faster in a vacuum

b)

X rays have a higher frequency

c)

Only X rays can be polarised

d)

X rays do not show diffraction effects

25.

Which of the following describes the type of wave produced on a stretched guitar string after it has been plucked?

a)

Stationary, longitudinal, electromagnetic

b)

Stationary, transverse, mechanical

c)

Progressive, longitudinal, electromagnetic

d)

Progressive, transverse, mechanical

26.

Two light wave sources with the same frequency and with a constant phase difference are said to be ….

a)

Polarised

b)

Diffracted

c)

Coherent

d)

Longitudinal

27.

Charge =

a)

Current x time

b)

Current/time

c)

Time/current

d)

IQ

28.

What is Kirchhoff's First Law based off?

a)

The law of conservation of charge

b)

The law of conservation of momentum

c)

The law of conservation of energy

d)

The law of conservation of mass

29.

What is Kirchhoff's Second Law based off?

a)

The law of conservation of charge

b)

The law of conservation of momentum

c)

The law of conservation of energy

d)

The law of conservation of mass

30.

The greater the number density...

a)

The greater the conductivity of the material

b)

The less conductive the material is

31.
a)

A

b)

B

c)

C

d)

D

32.
a)

A

b)

B

c)

C

d)

D

33.
a)

A

b)

B

c)

C

d)

D

34.
a)

A

b)

B

c)

C

d)

D

35.
a)

5.1m

b)

10m

c)

51m

d)

100m

36.
a)

10N

b)

12N

c)

20N

d)

40N

37.

Which is equivalent to the ohm?

a)

J C–2 s–1

b)

J C–2 s

c)

J s

d)

J s–1

38.
a)

A

b)

B

c)

C

d)

D

39.
a)

A

b)

B

c)

C

d)

D

40.

In a parallel plate capacitor, if the distance between the plates is doubled while keeping the voltage constant, what happens to the capacitance?

a)

A) It doubles

b)

B) It halves

c)

C) It quadruples

d)

D) It remains unchanged

41.

What is the relationship between the electric field (E), potential difference (V), and distance (d) in a uniform electric field?

a)

A) E = V/d

b)

B) V = Ed

c)

C) V = E/d

d)

D) E = V + d

42.

Which of the following is equivalent to a temperature of –100°C?

a)

–373 K

b)

–173 K

c)

173 K

d)

373 K

43.

A pure solid is heated at its melting point. While it is melting the

a)

mean kinetic energy of the molecules of the solid increases.

b)

mean potential energy of the molecules of the solid increases.

c)

temperature of the solid increases.

d)

temperature of the solid decreases.

44.

Which of the following is not an assumption of the kinetic model of ideal gases?

a)

All particles in the gas have the same mass.

b)

All particles in the gas have the same speed.

c)

The duration of collisions between particles is very short.

d)

Collisions with the walls of the container are elastic.

45.

What is the definition of the mole?

a)

The amount of substance that has the same mass as 6.02 × 1023 atoms of carbon-12.

b)

The amount of substance that contains as many nuclei as the number of nuclei in 12 g of carbon-12.

c)

The amount of substance that has the same mass as one atom of carbon-12.

d)

The amount of substance that contains as many elementary entities as the number of atoms in 12 g of carbon-12.

46.

An ideal gas is contained in a thermally insulated cylinder by a freely moving piston.


The gas is compressed by the piston and as a result the temperature of the gas increases. What is the explanation for the temperature rise?

a)

The rate of collision between the molecules increases.

b)

Energy is transferred to the molecules by the moving piston.

c)

The molecules of the gas are pushed closer together.

d)

The rate of collision between the molecules and the walls of the cylinder increases.

47.
A partially-inflated balloon is placed inside a bell jar. The bell jar is connected to an air pump. The air pump is switched on and air is removed from the bell jar.
What happens to the pressure and to the volume of the gas inside the balloon? 
a)
pressure decreases
volume decreases 
b)
pressure decreases 
volume increases 
c)
pressure increases 
volume decreases 
d)
pressure increases 
volume increases 
48.

what is internal energy?

a)

total of random distribution of KE and PE in a system

b)

total of random distribution of KE in a system

c)

sum of random distribution of PE in a system

d)

individual KE and PE of molecules in a system

49.

Why might a current-carrying wire be placed between a magnetic field?

a)

To increase the current from the interaction of magnetic fields

b)

To increase the voltage from the interaction of magnetic fields

c)

To produce a force from the interaction of magnetic fields

50.

What direction is the force/motion in the following diagram?

a)

Perpendicular to the magnets

b)

Downwards

c)

Parallel and through the magnets

51.

What angle must there be between a magnetic field and a conductor in order for the maximum force to be exerted?

a)

180

b)

45

c)

90

d)

270

52.

Give two ways you can reverse the direction of a basic dc motor?

a)

Reverse the current

b)

Keep the current the same

c)

Reverse the magnetic field

d)

Keep the magnetic field the same

53.

What motion does this velocity-time graph show?

a)

Constant Deceleration

b)

Increasing Deceleration

c)

Increasing Acceleration

d)

Decreasing Acceleration

54.

Archimedes Principle says the Upthrust on an object equals...?

a)

The weight of the object

b)

The weight of the water displaced

c)

The mass of water displaced

d)

Mass x gravity

55.

What is ALWAYS conserved in a collision?

a)

Kinetic Energy

b)

Potential Energy

c)

Momentum

d)

Mass

56.

What is the term for the point where the amplitude of a stationary wave is always zero?

a)

node

b)

antinode

c)

crest

d)

trough

57.

What is the term used to describe the stress value at the point of fracture, calculated by dividing the breaking force by the cross-sectional area?

a)

tensile strength

b)

breaking strength

c)

shear strength

d)

yield strength

58.

Two balls of masses m and 2m with initial velocities 2v and v collides as shown. After the collision, the mass m travels to the right a velocity of v. How much kinetic energy is lost?

a)

0.10 mv2

b)

0.25 mv2

c)

0.33 mv2

d)

0.50 mv2

59.

A cell of internal resistance r and electromotive force (e.m.f.) E is connected in series with a resistor of resistance R.


The resistance R and the e.m.f. E remain fixed. The internal resistance r of the cell changes over time.


Which graph best shows the variation of the current I in the circuit with the internal resistance r?

a)
b)
c)
d)
60.

Water waves of wavelength λ are incident normally on an obstacle with a narrow gap. The width of the gap is equal to λ. The waves from the gap emerge over an angle θ as shown.


The gap is slowly widened. Which changes, if any, occur to θ and to the wavelength of the emerging waves?

a)

θ decreases, λ remains the same

b)

θ increases, λ remains the same

c)

θ remains the same, λ decreases

d)

θ remains the same, λ increases

61.

A rubber cord hangs from a rigid support. A weight attached to its lower end is gradually increased from zero, and then gradually reduced to zero.


The force–extension curve for contraction is below the force–extension curve for stretching.


What does the shaded area between the curves represent?

a)

the elastic potential energy stored in the rubber cord

b)

the thermal energy dissipated in the rubber cord

c)

the work done on the rubber cord during stretching

d)

the work done by the rubber cord during contraction

62.

Continuos water waves are diffracted through a gap in a barrier in a ripple tank. Which change will increase the diffraction of the waves?

a)

increase the frequency of the waves

b)

increase the width of the gap

c)

reduce the wavelength of the waves

d)

reduce the width of the gap

63.

θ1 =35°, θ2=25°\theta1\ =35\degree,\ \theta2=25\degree  What is the refractive index, n, of water?

a)

1.37

b)

1.36

c)

1.35

d)

1.34

64.

The critical angle in the diagram is 43 degrees. What is the angle of refraction at the critical angle?

a)

Less than 43

b)

Equal to 43

c)

More than 43 but less than 90

d)

Equal to 90 degrees

65.

Even numbered harmonics (multiples of fundamental frequency) do not form in a closed pipe because

a)

the pipe “fits” only an odd number of quarter wavelengths

b)

the pipe “fits” only an even number of quarter wavelengths

c)

the pipe cannot put an anti-node at the open end

d)

the pipe cannot get enough air to vibrate in the pipe at these lengths

66.

The pipe length of A is 0.18 m. Sound travels at 343 ms-1 Calculate the frequency of the sound produced.

a)

686 Hz

b)

1905.56 Hz

c)

343 Hz

d)

1429.17 Hz

67.

The pipe length of B is 0.25 m. What is the wavelength of the sound produced?

a)

0.25 m

b)

0.5 m

c)

0.75 m

d)

1 m

68.

The pipe length of C is 0.25 m. What is the wavelength of the sound produced?

a)

0.25 m

b)

0.5 m

c)

0.75 m

d)

1 m

69.

The pipe length of D is 0.65 m. The frequency of the sound produced is 1200 Hz. Calculate the wave velocity.

a)

120 m/s

b)

600 m/s

c)

343 m/s

d)

780 m/s

70.
A standing wave:
a)
transports energy but does not move.
b)
is composed of a single travelling wave.
c)
stores energy.
d)
makes a loud noise.

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