Aqa phya4 june 2016 multiple choice answers

Here are all the answers:

Q1:
Question: What is conserved in an elastic collision?
Answer: D - all quantities are conserved

Q2:
Question: The force-time graph
Answer: B - the speed of the object 1.0 seconds later is 5.0 m/s.

Q3:
Question: What is the angular speed of a car wheel of diameter 0.400m with speed 108 km/h?
Answer: B - 150 rad/s

Q4:
Question: Minimum and Maximum Tension
Answer: D - 9.6N and 15N for the min and max tension respectively.

Q5:
Question: What is the true statement about an object performing SHM?
Answer: D - acceleration and displacement are always 180 degrees out of phase.

Q6:
Question: What is the incorrect statement about the motion of the pendulum?
Answer: C - the kinetic energy is maximum at T/2.

Q7:
Question: When is the resultant force on a mass-spring system minimum?
Answer: D - at the centre of oscillation.

Q8:
Question: Which pendulum oscillates with the greatest amplitude?
Answer: B - the one with the same length.

Q9:
Question: What is the gravitational force between X and Y when they are nearest to each other?
Answer: B - 3F

Q10:
Question: What is the gravitational potential at the midpoint P between the two stars?
Answer: C - (-4GM)/d

Q11:
Question: What is the height of the geosynchronous satellite?
Answer: B - 3.6 x 10^(7) m

Q12:
Question: What happens to the force on X when +2nC is added?
Answer: A - 2F in the direction X to Y

Q13:
Question: How does the magnitude of F vary with distance?
Answer: C - straight line: it is uniform field.

Q14:
Question: What is the electric field strength at P, the centre of the square?
Answer: A - zero

Q15:
Question: Which of these statements is correct?
Answer: C - when moving from X to Y, the electric potential decreases

Q16:
Question: What is the electric potential at P?
Answer: A - (-3Q)(8pi*e_(0) r)

Q17:
Question: How much work id sone when a +2.0nC is moved from R to S?
Answer: B - 0.15uJ

Q18:
Question: Which of the options is a unit for (e_0)G?
Answer: A - C^2 kg^(-2)

Q19:
Question: What is the voltage and charge across the capacitor?
Answer: C - 96V, 2.9 x10^(-10) C

Q20:
Question: Which pair of graphs show how the pd and current of a charging capacitor vary with time?
Answer: A - pd increasing, current decreasing

Q21:
Question: What is the magnitude and direction of the magnetic force on the conductor?
Answer: A - 0.075N vertically upwards

Q22:
Question: Through what angle, and direction, should the coil be rotated for flux linkage to be a (i) maximum and (ii) a minimum?
Answer: D - pi/3 anticlockwise for maximum, pi/6 for minimum

Q23:
Question: What is the emf induced between the ends of an axle 1.5m long?
Answer: C - 1.2 x 10^(-3) V

Q24:
Question: What is the ratio of flux linkage and current through the secondary coil in relation to the primary coil?
Answer: B - flux linkage >1, current <1

Q25:
Question: What is the main reason of high voltages in power lines?
Answer: D - increasing the voltage decreases the current.

Comment how many you got below. I got 24.

For Q12:

Question: What happens to the force on X when +2nC is added?

Would it not be from Y to X, since with 2nC added to both charges they would both be positive and so repel? Or did i missread the question?

I'd really appreciate a picture of Q10

22 or 23 if i can remember correctly

It was just 2 identical masses (M) seperated by distance 'd'. What is potential at midpoint?


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They would both be positive but X will have a greater positive charge, so if a positive test charge is placed in the region between X and Y it will move towards X as the electrostatic repulsion from X is greater than that of Y, hence X to Y

It asked for the force on X, no? The force acting on X would have to act towards it (i.e. Y to X).

Here are all the answers: