Beaconhouse School System Jhelum
Better A level Physics Questions
S.No
Q.No.1
Description
Marks
Remarks
The diagram below shows the initial state of two identical balls A and B
before collision and the final state immediately after the collision.
The mass of each ball is 1.2 kg.
Before the collision, the velocity of A is 3.0 m s−1 and B is stationary.
A makes an oblique collision with B.
After the collision, A moves off at an angle of 30° to its original direction
and has a velocity
of 2.6 m s−1. B is deflected at an angle  with a velocity of 1.5 m s−1.
a
Explain why the final momentum of the system in a direction at
right angles to the initial
velocity of A is zero. Hence determine the angle .
b Show that the total momentum of the system is conserved.
3
3
Q.No.2
A ladder of mass 32 kg rests at an angle against a smooth wall as shown in
the diagram. The centre of gravity of the ladder is at its mid-point.
[3]
[3]
a
Determine the force R exerted by the wall on the ladder by taking
moments about the base
of the ladder.
b
Explain why the force at the base of the ladder was not included
when doing the calculation in a.
Q.No.3
3
1
The diagram shows two springs X and Y connected in series and
supporting a weight of 8.0 N. The force constants of the springs are
shown on the diagram.
a
Calculate the extension of each spring.
b
Determine the force (spring) constant for the
combination.
c
According to a student, the force constant for the
springs in series is the sum of the force constants
of the individual springs. Is the student correct?
2
2
1
Q.No. 4
The intensity of a wave may be defined as the power transmitted per unit
cross-sectional area at right angles to the direction of travel.
a
3
For a point source of light, explain why the intensity I at a distance
r away from the source obeys an inverse square law with distance,
that is:
I
1
.
r2
b The intensity of visible light from the Sun reaching the upper parts
of our atmosphere is
about 1.4 kW m−2. The Sun has a radius of 7.0  108 m and is
1.5  1011 m from the Earth.
Calculate:
i the intensity of visible light emitted from the Sun’s surface
ii
the total power radiated by the Sun in the visible region of the
electromagnetic
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3
2
3
[3]
spectrum
iii
the intensity of light from the Sun at the planet Neptune.
(Neptune is 4.5  1012 m from the Sun.)
Q.No.5
[2]
The circuit shows a non-inverting amplifier with an output voltage of 8.0
V.
a
State two differences between an op-amp used as an inverting
amplifier and as a non-inverting amplifier.
b Calculate the gain of the amplifier shown in the circuit.
c Calculate the value of the input voltage Vin.
d Calculate the value of the current in the 40 k resistor.
e Determine the voltage across the 20 k resistor.
2
2
1
2
1
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[2]
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