Physics Questions

2022 OCR A level Physics A: Modelling Physics

1 / 15

A particle X of mass m collides with a stationary particle Y of mass 4m.

Immediately after the collision the particle X is moving at velocity v1 at an angle of 60 degrees to its original direction and the particle Y is moving with velocity v2 at 90 degrees to the velocity of particle X. What is the value of the ratio v1/v2 ?

2.3

3.9

4.0

6.9

2 / 15

A metal block of mass m is heated by an electric heater. The graph of temperature θ against time t for this block is shown below. The power of the heater is P. The gradient of the straight line graph is G. What is the correct expression for the specific heat capacity c of the metal?

c=G

c=PG/m

c=mP/G

c=P/mg

3 / 15

Which statement(s) below are implied by the assumptions of the kinetic theory model of gases?

A gas is mostly empty space.
Gas particles spend more time between collisions than time during collisions.
There are always forces between the gas particles.

Only 1 and 2

Only 1 and 3

Only 2 and 3

1, 2 and 3.

4 / 15

A container has 1.0 mole of gas at pressure 100kPa. The root mean square (rms) speed of the gas particles is 500m/s. The mass of each gas particle is 4.7 x 10^-26kg. What is the volume of the container?

3.9×10^-26 m3

4.7×10^-5 m3

2.4×10^-2 m3

4.7×10^-2 m3

5 / 15

A mass is attached to the bottom end of a spring which is fixed at its top end. The mass is displaced vertically and then released. The mass oscillates with a simple harmonic motion.

Which rows correctly describes the energy of this spring-mass system when the mass is at its lowest point in its oscillations?

Elastic potential energy: Max, Gravitational potential energy: Max, Kinetic energy: Max

Elastic potential energy: Max, Gravitational potential energy: Min, Kinetic energy: Zero

Elastic potential energy: Min, Gravitational potential energy: Max, Kinetic energy: Zero

Elastic potential energy: Min, Gravitational potential energy: Min, Kinetic energy: Max

6 / 15

Which pair of quantities do not have the same or equivalent units?

acceleration, gravitational field strength

angular frequency, angular velocity

gravitational potential, kinetic energy

impulse, momentum

7 / 15

The diagram shows three energy levels X, Y and Z of an electron within a gas atom. Which transition is correct when the electron absorbs a photon with the shortest wavelength?

Z to X

X to Z

Y to X

X to Y

8 / 15

Light from a hydrogen source is incident normally at a diffraction grating. The first order maximum of the H-alpha spectral line of wavelength 486nm is observed at angle of 30 degrees. Light from a distant receding star is observed using the same diffraction grating. The light is incident normally at the grating as before. The speed of this star is 0.16c, where c is the speed of light in a vacuum. What is the observed angle of the first order maximum of the H-alpha spectral line from the light of this receding star?

24.8 degrees

30.0 degrees

34.8 degrees

35.5 degrees

9 / 15

A galaxy, 1 billion light years away from the Earth, has a recession speed of 23000km/s. Which expression based on the information above is correct for the age of the universe in seconds?

age = 1 billion / 23,000,000

age = (1 billion x 1.5 x 10^11) / 23,000

age = (1 billion x 9.5 x 10^15) / (23,000,000)

age = (1 billion x 3.1 x 10^16) / 23,000,000

10 / 15

Astronomers observe approximately the same number of distant galaxies per unit volume of space in all directions. Which idea does this observation support?

Big bang model of the universe

Cosmological principle

Existence of dark matter

Hubble's law

11 / 15

A student has constructed below rows of possible scalar and vector quantities. Which row is correct?

scalar: acceleration, vector: momentum

scalar: displacement, vector: amplitude

scalar: frequency, vector: wavelength

scalar: mass, vector: centripetal force

12 / 15

The diameter of a wire is measured in five different places along its length. The results are shown below.

1.92mm, 1.88mm, 1.90mm, 1.86mm, 1.89mm

0.01mm

0.03mm

0.05mm

0.06mm

13 / 15

The object below is in equilibrium. A force, not shown on the diagram also acts on the object at point P. Which of the following shows the correct direction and magnitude of the force acting at point P?

Force of 5.6N acting in the north west direction at an angle of 30 degrees to the horizontal at P.

Force of 5.6N acting in the south east direction at an angle of 30 degrees to the horizontal at P.

Force of 5.6N acting to the West at P.

Force of 5.6N acting to the East at P.

14 / 15

The diagram below shows the directions and magnitudes of the three forces acting on an object at a specific time as it moves through water. The weight of the object is 1.20N, the upthrust on the object is 0.8N and the drag is 0.6N. Which statement is correct about this object at this specific time?

It has reached its terminal velocity.

It is accelerating

It is decelerating

It is moving upwards

15 / 15

A student has plotted a velocity against time graph for a trolley moving down a ramp. Which of the following pair of quantities can be determined from the gradient of the graph and the area under the graph?

acceleration, displacement

acceleration, impulse

displacement, kinetic energy

force, work done

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