Advanced level 2025 South West mock Physics 1
Advanced level 2025 South West mock Physics 1
The base unit of inductance is
A. kgms−2A−1
B. kgms−2A−2
C. kgm2s−2A−2
D. kgm2s−2A−1
The real gas equation, is given by (P+V2a)(V−b)=RT where P is the pressure of the gas, V its volume at a temperature T, R is the molar gas constant, a and b are constants. Which of the following is correct?
A. V2a has the same units with P
B. b has no units
C. a has the same units with V
D. V-b has the same units with RT
Figure 1 shows a steering wheel that rotates about O due to the forces 40 N on each side. The distance OR is 10.0 cm and cuts the diameter PQ of the wheel at the center. The torque on the wheel is:
A. 4 Nm
B. 8 Nm
C. 320 Nm
D. 800 Nm
When clay pot is used to cook, it takes a longer time for the water in the pot to start boiling compared to silver pot because;
A. clay and water both have high specific heat capacities
B. clay has a lower specific heat capacity than silver
C. clay is a better conductor of heat than silver
D. clay has a higher specific heat capacity than silver
Figure 2 shows a moving coil meter of resistance 100 Ω and full scale deflection of 50 mA. The meter could be converted to a mA of full-scale deflection 4 A if the value of R is:
A. 1.3 Ω
B. 100 Ω
C. Very large
D. 3.9 Ω
Wires used for making standard resistances such as 2.0 Ω should best have a temperature coefficient of resistance which is:
A. positive
B. negative
C. high
D. low
One student connects two similar capacitors each of capacitance, C, in series and then in parallel, while another student connects two similar resistors each of resistance, R, in series and then in parallel. Which of the following is correct?
| Effective capacitance | Effective resistance |
| :— | :— |
| A. in series is ½ C | in parallel is 2R |
| B. in series is 2C | in series is 2R |
| C. in parallel is 2C | in parallel is ½ R |
| D. in parallel is 1 ½ C | in series is ½ R |
The flux linkage in a coil is increased from 5 Wb to 8 Wb in 2 s by increasing steadily the current through the coil. The induced emf during this time is:
A. 3.0 V
B. 1.5 V
C. 2.0 V
D. 1.0 V
Figure 3 shows the P-V curve of a gas. Which of the following is correct about the gas?
Figure 3
A. The work done during the expansion is 90 J
B. The path AC is an adiabatic process
C. The shaded region represents the work done
D. The work done along AC is 100J
Figure 4 shows how the potential energy U for a pair of adjacent molecules varies with separation r. Which of the following is correct?
Figure 4
A. The equilibrium separation is 1 x 10−10 m
B. The minimum potential energy required to separate the molecules is 2 x 10−21 J
C. At r = 2 x 10−10 m, there is no net force between the molecules
D. For r > 1 x 10−10 m, the net force between molecules is attractive.
Which of the following is NOT an assumption when deriving the pressure of an ideal gas?
A. The collisions between the gas molecules are perfectly elastic
B. The molecules are so numerous that the laws of statistics apply
C. The duration of collision is negligible compared to the time between collision
D. The volume of the gas is negligible compared to the volume of the container
The emf, E, of a power source of internal resistance r, is related to the potential difference, V, across it and the current, I, it delivers by the equation E = V + Ir. To obtain the values of E and r
A. V is plotted against I and the intercept is E
B. lnV is plotted against lnI and gradient is -r
C. V is plotted against I and gradient is r
D. I is plotted against V and the gradient is -r
Figure 5 shows how a triangular shape hangs on two ropes with the tensions and the angles indicated. The value of the force W, is:
Figure 5
A. 32 N
B. 23 N
C. 34 N
D. 22 N
The charge Q, left on a discharging capacitor after time t, is given by Q=Q0e−CRt where C and R are respectively the capacitance and resistance of the circuit. The half-life of the capacitor is
A. CR
B. 0.37CR
C. 2.7CR
D. 0.69CR
In figure 6, which of the diagrams is a correct representation of population inversion in light production?
Figure 6
A.
B.
C.
D.
Figure 7 shows how electrical components can be connected in a circuit. L is the inductance of the circuit while R is the resistance. B1 and B2 are bulbs. As soon as the switch S1 is closed,
Figure 7
A. B1 attains full brightness earlier than B2
B. B2 attains full brightness earlier than B1
C. B1 and B2 attain full brightness at the same time and immediately
D. B1 and B2 attain full brightness at the same time but a few seconds later
The air in an open pipe is set into vibration by a tuning fork marked 512 Hz. If the air vibrates at its fundamental mode at a temperature where the speed of sound in air is 340 m/s then the length of the pipe is:
A. 1.51 m
B. 3.01 m
C. 66.0 cm
D. 33.0 cm
Which of the following electromagnetic waves correctly matches its mode of production?
| EM wave | Mode of production |
| — | — |
| A. Ultraviolet | Atomic transition |
| B. Gamma rays | Molecular vibration |
| C. Visible light | Radioactive decay |
| D. Microwaves | Electrical oscillation |
A ball is thrown vertically upward into air with an initial velocity u. If the acceleration of free fall is g, which of the following is true when the ball returns to the thrower?
| | Time of travel | Total distance travelled |
| — | — | — |
| A. | 2u/g | 2u2/g |
| B. | 2u/g | u2/g |
| C. | u/g | 2u2/g |
| D. | u/g | u2/g |
A small charge Q2 of +2 x 10−8 C is placed 8.0 cm from a small charge Q1 of charge -4 x 10−8 C as shown in figure 8. Point O is midway between Q1 and Q2. The electric potential at O is:
Figure 8
A. +9000 V
B. 0 V
C. -4500 V
D. -9000 V
Which of the following instruments can be calibrated and used to measure the peak values of an a.c voltage?
A. Potentiometer
B. Hall probe
C. Junction diode
D. D.C cathode ray oscilloscope
When white light is incident normally on a circular aperture, the pattern on a nearby screen is:
A. a mixture of rainbow colors at the center
B. white at the edges
C. white center
D. made of all visible bright spots which are all white
The displacement, y, of a particle performing simple harmonic motion with time t, is defined by y = 0.2sinωt where ω is the angular velocity. The maximum speed of the particle in m/s is
A. ω
B. 0.2
C. 0.4 ω
D. 0.2 ω
A thin sheet of glass of refractive index 1.5 and thickness 0.5 cm is placed in the path of light. The path difference of light observed is:
A. 0.8 cm
B. 3.0 cm
C. 0.3 cm
D. 1.5 cm
A policeman sounds his whistle that has a natural frequency f, at a police control post to a car approaching with speed 25 m/s. If the speed of sound in air is 340 m/s then the perceived frequency by the driver of the car is:
A. 1.08 f
B. 0.92 f
C. 0.93 f
D. 1.07 f
X-rays are produced when fast moving electrons accelerated through a potential difference, V, between the anode and the cathode are stopped by a metal. Which of the following is true about the production of the X-rays?
A. The intensity of the X-rays is controlled by adjusting the heating current
B. Both intensity and hardness of the X-rays are controlled by adjusting the accelerating voltage
C. The hardness of the X-rays is controlled by adjusting the heating current
D. The intensity of the X-rays is controlled by adjusting the accelerating voltage
The ionization energy of mercury in joules is:
A. 2.66 x 10−19
B. -1.66 x 10−19
C. 1.66 x 10−19
D. -2.56 x 10−19
The fundamental interval of a mercury-in-glass thermometer is 25.0 cm at stp. Given that the length of the mercury thread at the ice point is 5.0 cm, the temperature of a body which gives a mercury thread of 15.0 cm is:
A. 40 K
B. 313 K
C. 373 K
D. 233 K
Figure 11 shows a ball whirled round using a string. The tension in the string is maximum at:
Figure 11
A. S
B. P
C. Q
D. R
Copper has 8.0 x 1028 conducting electrons per cubic meter. A copper wire of length 1.2 m and cross-sectional area 4.5 x 10−6m2 carrying a current and lying at right angle to a magnetic field of strength 2 x 10−3 T experiences a force of 5.0 x 10−3 N. The drift velocity of free electrons in the copper wire in m/s is:
A. 3.6
B. 1.6 x 105
C. 3.6 x 105
D. 0.4
A cylindrical wire made of a certain material has a length of 2.5 m and a diameter of 1.0 mm. If the resistivity of the wire is 1.68 x 10−8 Ωm, then the conductance of the wire in siemens is:
A. 0.05
B. 18.7
C. 0.19
D. 4.67
A steel rod experiences a stress of 200 MPa and a strain of 0.1%. Then the Young’s modulus of the steel is:
A. 2 x 102Nm−2
B. 2 x 104Nm−2
C. 2 x 109Nm−2
D. 2 x 1011Nm−2
Given that the temperature of gas molecules in a container increases by 50°C, then
