When a body is accelerating, the resultant force acting on it is equal to its A. change of momentum. B. rate of change of momentum. C. acceleration per unit of mass. D. rate of change of kinetic energy.

In an experiment to

measure the

acceleration of free fall

at the surface of the

Earth, the following

results were obtained.

These results are

Acceleration of free fall / m s–2

7.69

7.70

7.69

7.68

7.70

A. accurate and precise.

B. inaccurate but precise.

C. accurate but imprecise.

D. inaccurate and imprecise..

When a voltage V of 12.2 V is applied to a DC motor, the current I in the motor is 0.20 A. Which one of the following is the output power VI of the motor given to the correct appropriate number of significant digits? A. 2 W B. 2.4 W C. 2.40 W D. 2.44 W

Light is incident on a clean metal surface in a vacuum. The maximum kinetic energy KEmax of the electrons ejected from the surface is measured for different values of the frequency f of the incident light. The measurements are shown plotted below.

Use the graph to determine the minimum energy required to eject an electron from the surface of the metal (the work function).

frequency intercept = 4.8 × 1014 Hz; therefore minimum energy = hf; = 4.8 (±0.2) × 1014 × 6.9 (±0.3) × 10–34 = 3.3 (±0.5) × 10–19 J;

A wave generator produces a power per unit length of 4.0 kW m–1 for waves of amplitude A and speed v. The efficiency of the generator is constant. The power per unit length obtained from waves of amplitude 2A and speed 2v would be A. 8.0 kW m–1. B. 16 kW m–1. C. 32 kW m–1. D. 64 kW m–1.

Some of the energy levels of the hydrogen atom are shown below.

–––––––––––––– – 0.54 eV –––––––––––––– – 0.85 eV –––––––––––––– – 1.51 eV –––––––––––––– – 3.39 eV –––––––––––––– – 13.6 eV

Electrons are excited to the 0.85 eV level. How many different photon frequencies will be observed in the emission spectrum of hydrogen? A. 3 B. 4 C. 5 D. 6

Raoul suggests that power losses in a transformer may be reduced by the following: I. Constructing the core from a solid block of steel. II. Using large diameter wire in the coils. III. Using wire of low resistivity. Which of the above suggestions would reduce power loss? A. I only B. II only C. II and III only D. I, II and III

Which one of the following is a correct definition of the decay constant of a radio-isotope? A. The constant of proportionality linking half-life to rate of decay of nuclei. B. The constant of proportionality linking decay rate to number of undecayed nuclei. C. The reciprocal of the half-life of the radio-isotope. D. The rate of decay of nuclei in a fresh sample of the radio-isotope.

The number of heartbeats of a person at rest in one hour, to the nearest order of magnitude is A. 101. B. 102. C. 103. D. 105.

Outline two preventable mistakes that contributed to the nuclear disaster at the Fukushima Daiichi nuclear power plant in March, 2011.

Diesel generators were placed near sea-level/sea wall was too low to prevent tsunami wave from entering the plant/sea water could have been used much earlier to cool the reactor/the Japanese government was slow to alert the public about the need for evacuation;

A ball is released from rest near the surface of the Moon. Which one of the following quantities increases at a constant rate? A. Only distance fallen B. Only speed C. Only speed and distance fallen D. Only speed and acceleration

A. G-1

B. G C. IP(VP)-1

D. VP(IP)-1

Proton number Nucleon number

A. 15 30

B. 16 31

C. 30 15

D. 31 16

When the isotope aluminium-27 is bombarded

with alpha particles, the following nuclear

reaction can take place.

neutronXAlHe 27

13

4

2

Which of the following correctly gives the

atomic (proton) number and mass (nucleon)

number of the nucleus X?

An object is moving at constant velocity. Which one of the following quantities must have zero magnitude? A. Weight of object B. Momentum of object C. Kinetic energy of object D. Resultant force on object

. B. h. C. h2. D. h3.

The gravitational potential energy of the water

stored in the basin between a high tide and a low

tide is proportional to

A.

h

Water is contained in a tidal basin behind a

dam. The water has a depth h at high tide and

zero at low tide, as shown in the diagram.

A dry cell has an emf E and internal resistance r and is connected to an external circuit. There is a current I in the circuit when the potential difference across the terminals of the cell is V. State expressions, in terms of E, V, r and I where appropriate, for

(i) the total power supplied by the cell; (ii) the power dissipated in the cell; (iii) the power dissipated in the external circuit.

Two lengths, a and b, are measured

to be 51±1 cm and 49±1 cm

respectively. In which of the following

quantities is the percentage

uncertainty the largest?

A. a + b B. a – b

C. a × b D.

b

a

A coil of area S has N turns of wire. It is placed in a uniform magnetic field of strength B so that its plane makes an angle h with the direction of the magnetic field as shown. The magnetic flux linkage is A. BSN sin h. B. BSN cos h. C. BSN tan h. D. BSN.

shape of curve wrong / curve does not go through zero;

.inv

The maximum electrical power generated by a wind

turbine, Pout, was measured over a range of incident

wind speeds, vin.

The graph below shows the

variation with vin of Pout.

Uncertainties for the data

are not shown.

It is suggested that Pout

is proportional to

State one reason why the

best fit line does not

support this hypothesis.

The reading on the voltmeter is A. 2.0 V. B. 3.0 V. C. 4.0 V. D. 6.0 V.

advantages: wind is renewable so no resources used up / wind is free / no chemical pollution / carbon dioxide emission / does not add to the enhanced greenhouse effect; disadvantages: expensive initial / capital costs / large land area needed / visual / noise pollution / winds unpredictable / not constant / affect on birds;

Outline two advantages and two disadvantages of using wind turbines to generate electrical energy.

The following are statements concerning radioactive decay. I. Alpha particles have discrete energies. II. The beta-energy spectrum is a broad continuous distribution of energies. III. Gamma rays are emitted with discrete energies. Which statement(s) is(are) evidence for the existence of nuclear energy levels? A. I only B. II only C. III only D. I and III only

The purpose of a nuclear power station is to produce electrical

energy from nuclear energy. The diagram below is a

representation of the principal components of a nuclear reactor

pile used in a certain type of nuclear power station that uses

uranium as a fuel.

The function of the moderator is to slow down the

neutrons produced in a reaction such as that described

above.

Explain why it is necessary to slow down the

neutrons.

there is more uranium-238 present than uranium-235; neutron capture is more likely in U-238 with high energy neutrons; if the neutrons are slowed they are more likely to produce fission in U-235 than neutron capture in U-238;

The purpose of a nuclear power station is to produce electrical

energy from nuclear energy. The diagram below is a

representation of the principal components of a nuclear reactor

pile used in a certain type of nuclear power station that uses

uranium as a fuel.

The function of the moderator is to slow down the

neutrons produced in a reaction such as that described

above.

Explain the function of the control rods.

control rate at which reactions take place; by absorbing neutrons;

(energy released) = 2.1895 x 105 - (1.3408 + 0.83749 + 0.0093956) x 105; = 181.44 MeV……. [180 MeV]

In a mass spectrograph (spectrometer), ions of isotopes of the same element follow different semicircular paths in a uniform magnetic field as shown below. The difference in path curvature is essentially due to the fact that the ions have different values of A. charge only. B. mass only. C. mass and charge. D. mass and speed.

Determine the energy for one photon of the light.

3.3 × 10–19 J