OCR GCE AS Level Physics A AS Paper 1 June 2016 question paper H156/01

The watt is the SI unit for power.

Which is the correct definition for the watt? A watt is....

A the rate of work done.

B the work done per second.

C a joule per second.

D a joule per unit time.

A crane is used to lift a load directly from point X to point Y.

The weight of the load is W. p, q and r are distances between points X, Y and Z as shown in the diagram.

What is the work done against the weight?

D W (q + r)

A student views the display of a laptop screen through a polarising filter. The intensity of the light changes when the filter is rotated.

Which property of light is demonstrated in this experiment?

A It has wavelength of about 5 × 10^–7 m.

B It travels at the speed of light.

C It is a transverse wave.

D It is a longitudinal wave.

Electrons travelling through a thin film of carbon are diffracted. Which statement is correct?

The electrons behave like....

A photons and are deflected by the carbon atoms.

B photons and change direction as their speed changes.

C waves and are refracted by the holes in the carbon film.

D waves of wavelength similar to the spacing between carbon atoms.

In which region of the electromagnetic spectrum is radiation of wavelength 50 m?

A visible

B infra-red

C microwave

D radio

A block of wood is at rest on a ramp. The weight of the block is W and the frictional force on the block is F.

A triangle of forces diagram can be used to determine the magnitude and the direction of the normal contact force N.

Which is the correct diagram for this triangle?

A 9 V battery is connected to two resistors as shown. The terminals X and Y are connected to another circuit that draws a current of 1 mA. The current from the battery is 3 mA.

What is the power supplied to the circuit connected between X and Y ?

A 6 mW

B 12 mW

C 18 mW

D 27 mW

Two batteries are connected in a circuit with a lamp as shown.

The batteries have e.m.f. 5.0 V and 3.0 V. Which row is correct?

The diagram shows the conventional currents entering and leaving a junction in an electric circuit.

Which statement is always true?

A I₁ + I₂ = I₃ + I₄

B I₁ – I₂ + I₃ – I₄ = 0

C I₁ = I₂ and I₃ = I₄

D I₁ + I₂ + I₃ + I₄ = 0

A student determines the resistance R of a filament lamp by measuring the potential difference across it and the current I in it. The values recorded by the student are:

V = (5.00 ± 0.20) V and I = (40.0 ± 1.0) mA.

What is the percentage uncertainty in the value of R ?

A 1.5%

B 1.6%

C 6.5%

D 20%

A golf ball is dropped from rest onto a hard floor. The graph shows how the velocity of the ball varies with time as it bounces, from the time of release.

At which point does the ball reach its maximum height after the first bounce?

An electron gun is used to accelerate electrons from rest through a voltage V. The electrons emerge with a speed u.

The voltage in the gun is halved to . At what speed do the electrons emerge?

Photons of energy 4.8 × 10^–19 J are incident on the surface of a clean metal plate of work function 3.2 × 10^–19 J.

What is the maximum speed of emitted electrons?

A 5.9 × 10⁵ m s^–1

B 8.4 × 10⁵ m s^–1

C 1.0 × 10⁶ m s^–1

D 1.3 × 10⁶ m s^–1

Two guitar strings of equal length, but of different thickness, are under the same tension. The strings are made of the same material.

The thinner string has a diameter of 0.20 mm and the thicker string has a diameter of 0.80 mm.

A 0.125

B 0.25

C 4.0

D 16

A ball is thrown at an angle of 30° to the horizontal. The initial kinetic energy of the ball is K. Air resistance has negligible effect on the motion of the ball.

What is the kinetic energy of the ball at the maximum height?

A 0

B 0.25 K

C 0.75 K

D 0.87 K

A resistor of resistance R is connected in parallel with a resistor of resistance 2 R. The combination of resistors is connected to a cell.

C 1

D 2

The speed of light in air is 3.0 × 10⁸ m s^–1 and the speed of light in glass is 2.0 × 10⁸ m s^–1. A ray of monochromatic light in glass strikes the glass-air boundary at an angle of 80 to the boundary.

What is the angle made to the normal by the ray of light leaving the boundary?

A 6.6

B 15

C 41

D 49

Physical quantities can be added together. Velocity and mass are examples of two different types of physical quantities. Discuss how the addition of two velocities differs from the addition of two masses.

Fig. 21 shows a stationary trolley on a smooth ramp.

A short length of string is attached between the end of the trolley and the top of the ramp. Assume that the frictional force acting on the trolley is negligible when it is stationary or when it is moving.

Other than the normal contact force, there are two other forces acting on the stationary trolley. On Fig. 21, draw arrows to show these two forces. You do not need to name these forces.

The string is cut at time t = 0. The trolley travels down the ramp with a constant acceleration of 3.0 m s^–2. Calculate the time t taken by the trolley to travel a distance of 0.80 m down the ramp.

Fig. 22 shows that the straight line does not pass through the origin because of a systematic error in the measurement of the braking distance x. The u² values are accurate. Suggest why a systematic error in x does not introduce any difference between the actual value and the experimental value for the deceleration of the car.

The mass of the car is 920 kg. Use the gradient of the line drawn in Fig. 22 to determine the braking force F acting on the car.

Fig. 23.1 shows a metal cylinder of diameter of about 5 cm placed on a horizontal table.

Describe how you can use instruments available in a physics laboratory to determine the pressure exerted by the cylinder on the table. State how you would make your results as precise as possible.

State Archimedes’ principle.

Fig. 23.2 shows the metal cylinder from (a) hung from a newtonmeter.

The reading on the newtonmeter is 9.0 N. The cylinder is slowly lowered into water in a beaker until it is completely submerged. The cylinder does not touch the side or the bottom of the beaker. The newtonmeter reading now is 7.8 N. The density of water is 1000 kg m^–3. Calculate the density of the metal of the cylinder.

=........ kg m^–3

State Newton’s second law.

A comet makes an inelastic collision with a small asteroid in space.

State two physical quantities conserved in this collision.

1........

2........

Fig. 24.1 shows how the force F acting on the comet varies with time t during the collision.

Describe and explain how the force acting on the asteroid varies with time during this collision. You may sketch a suitable graph on Fig. 24.1 to support your answer.

A hydrogen atom travelling at 500 m s^–1 makes a head-on collision with a stationary carbon atom. The collision is perfectly elastic. After the collision the hydrogen atom bounces back with a speed of 420 m s^–1. Fig. 24.2 shows the atoms before and after the collision.

The mass of the hydrogen atom is 1.7 × 10^–27 kg and the mass of the carbon atom is 2.0 × 10^–26 kg. Calculate the speed v of the carbon atom after the collision.

v =........ m s^–1

A chemical cell is connected across a resistor.

The terms electromotive force (e.m.f.) and potential difference (p.d.) are terms associated with the circuit.

State one similarity and one difference between e.m.f. and p.d.

similarity:

difference:

The resistor is cylindrical in shape. It has cross-sectional area 1.2 × 10^–6 m² and length 6.0 × 10^–3 m. In this resistor there are 9.6 × 10¹⁶ free electrons. Calculate the mean drift velocity v of the electrons when the current in the resistor is 3.0 mA.

v =........ m s^–1

A student is given a chemical cell, an ammeter, a voltmeter, a variable resistor and a number of connecting wires. Design a laboratory experiment to determine the internal resistance r of the chemical cell using a graph. Start with a circuit diagram. In your description pay particular attention to

• the circuit used

• the measurements taken

• how the data is analysed using a graph.

Fig. 26.1 shows the variation of displacement y with position x of a progressive transverse wave on a stretched string at a particular instant.

The motions of particles A and B of the string is analysed over a short period of time. The distance between the positions of A and B is half a wavelength of the wave. The particles A and B have the same speed.

State one difference between the motions of these particles.

The particle A oscillates with frequency 75 Hz. The distance between the positions of A and B is (40.0 ± 2.0) cm. Calculate the speed v of the transverse wave on the string and the absolute uncertainty in this value.

v =........ ±........ m s^–1

A stretched rubber cord has its ends fixed at points X and Y. The middle of the cord is lifted vertically and then released. A stationary wave pattern with one loop is formed by the vibrating cord, see Fig. 26.2.

Explain how a stationary wave pattern is produced in this arrangement.

The stationary wave pattern shown in Fig. 26.2 is produced in the laboratory. Describe how the wavelength of the transverse wave on the stretched cord can be determined.

Fig. 27.1 shows the I-V characteristic of an LED designed to emit blue light.

Describe and justify the variation of resistance R of the LED as the potential difference across the LED is increased from

• –1.0 V to 2.6 V

• 2.6 V to 3.0 V

• 3.0 V to 3.4 V.

A student uses the LED with the characteristic shown in Fig. 27.1 to construct the circuit shown in Fig. 27.2.

A suitable resistor R is used in the circuit. The cell has electromotive force (e.m.f.) of 1.5 V and negligible internal resistance. The LED fails to emit any light when the switch S is closed. Explain why the circuit does not work and modify the design of the circuit so that the LED is lit when S is closed.

The wavelength of light from the LED is 480 nm. The radiant power emitted from the LED is 1.2 mW. Calculate the number of photons N emitted from the LED per second.

N =........ s^–1