Multiple Choice A2 Set 1
Q1.
A string passes through a smooth thin tube. Masses m and M are attached to the ends of the string. The tube is moved so that the mass m travels in a horizontal circle of constant radius r and at constant speed v.
 
Which of the following expressions is equal to M ?
 
A			
B	mv2rg		
C			
D			
(Total 1 mark)
Q2.
The tip of each prong of a tuning fork emitting a note of 320 Hz vibrates in simple harmonic motion with an amplitude of 0.50 mm.
What is the speed of each tip when its displacement is zero?
A        zero
B        0.32π mm s–1
C        160π mm s–1
D        320π mm s–1
(Total 1 mark)

Q3.
The diagram shows four point charges, each +Q, at the corners of a square of side 2a.
 
What is the electric field strength at P, the centre of the square?
 
A	zero	
B		
C		
D		
(Total 1 mark)
Q4.
Charged particles, each of mass m and charge Q, travel at a constant speed in a circle of radius r in a uniform magnetic field of flux density B.
Which expression gives the frequency of rotation of a particle in the beam?
 
A	 		
B	 		
C	 		
D	 		
(Total 1 mark)
Q5.
Which of the following best describes the decay constant for a radioisotope?
 
A	The reciprocal of the half-life of the radioisotope.	 	
B	The rate of decay of the radioisotope.	 	
C	The constant of proportionality which links half-life to the rate of decay of nuclei.	 	
D	The constant of proportionality which links rate of decay to the number of undecayed nuclei.	 	
(Total 1 mark)
Q6.
The diagram shows the path of an α particle deflected by the nucleus of an atom. Point P on the path is the point of closest approach of the α particle to the nucleus.
 
Which of the following statements about the α particle on this path is correct?
 
A 	Its acceleration is zero at P. 	 	
B 	Its kinetic energy is greatest at P. 	 	
C	Its potential energy is least at P. 		
D	Its speed is least at P. 	 	
(Total 1 mark)

Q7.
A liquid flows continuously through a chamber that contains an electric heater. When the steady state is reached, the liquid leaving the chamber is at a higher temperature than the liquid entering the chamber. The difference in temperature is Δt.
Which of the following will increase Δt with no other change?
 
A	Increasing the volume flow rate of the liquid	 	
B	Changing the liquid to one with a lower specific heat capacity	 	
C	Using a heating element with a higher resistance		
D	Changing the liquid to one that has a higher density	 	
(Total 1 mark)
Q8.
A planet has a radius half the Earth’s radius and a mass a quarter of the Earth’s mass. What is the approximate gravitational field strength on the surface of the planet?
 
A	1.6 N kg–1	 	
B	5.0 N kg–1	 	
C	10 N kg–1	 	
D	20 N kg–1	 	
(Total 1 mark)

 Q9.
A voltage sensor and a datalogger are used to record the discharge of a 10 mF capacitor in series with a 500 Ω resistor from an initial pd of 6.0 V. The datalogger is capable of recording 1000 readings in 10 s.
 
After a time equal to the time constant of the discharge circuit, which one of the rows gives the pd and the number of readings made?
 
 	Potential difference / V	Number of readings	 	
A	2.2	50		
B	3.8	50		
C	3.8	500		
D	2.2	500		
(Total 1 mark)

Q10.
The diagram shows a small negative charge at a point in an electric field, which is represented by the arrowed field lines.
 
Which of the following statements, about what happens when the charge is displaced, is correct?
When the negative charge is displaced
 
A	to the left the magnitude of the electric force on it decreases.	 	
B	to the right its potential energy increases.	 	
C	along the line PQ towards Q its potential energy decreases.	 	
D	along the line PQ towards P the magnitude of the electric force on it is unchanged.	 	
(Total 1 mark)

Mark schemes
Q1.
C
[1]
Q2.
D
[1]
Q3.
A
[1]
Q4.
A
[1]
Q5.
D
[1]
Q6.
D
[1]
Q7.
B
[1]
Q8.
C
[1]
Q9.
D
[1]
Q10.
D
[1]