OCR GCE AS Level Physics A AS Paper 1 June 2019 question paper H156/01

The table below shows four physical quantities and their units.

Which row is correct?

Four students each carry out an experiment to determine the acceleration of free fall g.

Which is the least accurate value?

(9.0 ± 1.0) m s^–2 A

(9.5 ± 0.1) m s^–2 B

(9.6 ± 0.4) m s^–2 C

(9.7 ± 0.2) m s^–2 D

A uniform concrete slab is placed on two supports. The slab sags due to its own weight.

Which point, A, B, C or D, of the slab is under maximum compression?

A household is planning to change all their 60 W filament bulbs to 12 W LED bulbs. The household has a total of 10 bulbs. Each bulb will be used for about 2000 hours in one year. The cost of 1 kWh is 15.4 p.

What would the annual saving be?

A £7.39

B £36.96

C £147.84

D £184.80

A force of 12 N moves an object at an angle to the force. The object travels 9.6 m and the work done by the force is 52 J.

What is the angle ?

A 1.1°

B 27°

C 63°

D 90°

The resistance of a wire of length L is 3.00 . The wire is extended so that its length becomes 1.50 L. Its volume remains the same.

What is the resistance of the extended wire?

A 2.00

B 3.00

C 4.50

D 6.75

The diagram below shows a potential divider circuit.

The minimum resistance of the variable resistor is zero and its maximum resistance is 3 R, where R is the resistance of the fixed resistor. The power supply has electromotive force (e.m.f.) 4.0 V and negligible internal resistance. The voltmeter has infinite resistance.

The resistance of the variable resistor is changed from its minimum to its maximum value.

How does the voltmeter reading change?

A from 0 V to 1.0 V

B from 0 V to 3.0 V

C from 1.0 V to 4.0 V

D from 3.0 V to 4.0 V

The waves from the sources X and Y are coherent and have wavelength 10.0 cm. The waves are in phase at X and Y.

Which row gives the correct conditions for constructive interference at point Z ?

The table shows the refractive index n of four transparent materials A, B, C and D.

Which material has the smallest critical angle?

The frictional force acting on an object falling vertically through water is directly proportional to its speed squared.

What is the correct relationship between P, the rate of work done against the frictional force, and the speed v of the object?

B P v

In a particle-accelerator electrons are accelerated through a potential difference of 120 kV. The electron beam current is 8.0 A.

What is the total energy transferred to the electrons in a time of 2.0 hours?

A 0.96 J

B 120 J

C 1900 J

D 6900 J

The electric charge on particles is quantised and a multiple of the elementary charge.

Which charge on a particle is possible?

1.0 × 10^–19 C A

4.0 × 10^–19 C B

8.0 × 10^–19 C C

8.8 × 10^–19 C D

Two forces act in the plane of this paper. The magnitude and direction of the two forces are shown below.

The two forces are added together.

Which diagram shows the correct resultant?

Power has base units kg m² s^–3. 17

What are the base units for intensity?

kg s^–3 A

kg m s^–3 B

kg m² s^–3 C

kg m⁴ s^–3 D

A ball of diameter 2.50 cm is held above the ground. The bottom of the ball is 10.2 cm above the ground. The ball is released from rest. Air resistance has negligible effect on the motion of the ball.

What is the time taken for the ball to reach the ground?

A 0.021 s

B 0.144 s

C 0.152 s

D 0.161 s

Which of the following waves can be polarised and has a typical wavelength of about a few centimetres?

A microwaves

B ultraviolet

C sound

D visible light

Stationary sound waves are produced in the air inside a tube. The tube is closed at one end.

Which pattern of nodes (N) and antinodes (A) is likely to be correct?

For a system to be in equilibrium, the resultant force must be zero.

State another condition that must be satisfied for the system to be in equilibrium.

Fig. 21.1 shows a ball at rest on a horizontal table.

The weight of the ball is W and the normal contact force on the ball is N.

According to Newton’s third law of motion, W is one of the forces in a pair of equal and opposite forces.

Name the object that experiences a force of magnitude W but in the opposite direction to W.

According to a student, W = N is a consequence of Newton’s third law of motion.

State why this is incorrect.

Fig. 21.2 shows a model dolphin in a museum. The dolphin is held in equilibrium by two cables A and B.

The tension in cable A is 68.0 N and it makes an angle of 10° to the horizontal. The tension in cable B is 87.4 N and it makes an angle of 50° to the vertical.

Calculate the total vertical force F supplied by cables A and B by resolving the tensions in cables A and B.

Use your answer from (i) to calculate the mass m of the dolphin.

The cables A and B have the same length and cross-sectional area. The material of cable B has Young modulus 1.29 E, where E is the Young modulus of the material of cable A. Both cables obey Hooke’s law.

A metal ball is released from rest. It falls vertically towards the ground. Fig. 22 shows the variation with time t of the displacement s of the ball.

Air resistance has negligible effect on the motion of the ball.

The ball hits the ground at t = 0.50 s. During the collision, the ball is in contact with the ground for a time of 1.8 ms. The mass of the ball is 56 g.

Describe and explain the variation of the velocity of the ball from t = 0.20 s to t = 0.70 s.

No calculations are required.

Use an equation of motion to show that the speed of the ball is 4.9 m s^–1 just before it hits the (b) ground.

Draw a suitable tangent to the curve in Fig. 22 and show that the rebound speed of the ball is about 3.5 m s^–1.

Calculate the average resultant force acting on the ball during the collision.

Calculate the current I in the circuit. Write your value to an appropriate number of significant figures.

This question is about two identical filament lamps. Fig. 23.2 shows the I - V characteristic of each lamp.

The lamps are connected to a 6.0 V supply of negligible internal resistance in series shown in Fig. 23.3, and then in parallel, as shown in Fig. 23.4.

The current from the supply in the series circuit is I_S and the current from the supply in the parallel circuit is I_P. I_P is found to be almost 3 times greater than I_S. Use Fig. 23.2 to explain why I_P is almost 3 times greater than I_S. Show any calculations and your reasoning below.

You are provided with a rectangular block of plastic.

Describe how you can use a ray-box (or a laser beam), together with other equipment available in the laboratory, to accurately determine the refractive index of the plastic block.

Draw a straight line of best fit and determine the gradient of this line.

gradient =........ Hz m

Explain why the gradient of the line is , where v is the speed of sound.

Use your answer in (i) and the information given in (ii) to determine v.

v =........ m s^–1

The smaller values of L are much more difficult to determine with the microphone in this experiment and this produces large percentage uncertainty in the values of Suggest how this percentage uncertainty may be reduced in this experiment.

State one piece of evidence for the wave-like behaviour of electrons.

In an electron-gun, each electron is accelerated to a maximum kinetic energy of 210 eV.

Show that the final speed of each electron is about 9 × 10⁶ m s^–1. (i)

Calculate the de Broglie wavelength of each electron.

Electromagnetic waves interact with matter as photons.

Explain the photoelectric effect using ideas of photons, conservation of energy and work function.