# Question 1

1.1 Inertia is the tendency of an object to …

A maintain its mass.
B continue in a state of non-uniform motion.
C remain at rest or in the state of uniform motion.
D maintain its velocity when a non-zero net force is acting on it. (2)

1.2 A person stands on a bathroom scale that is fixed to the floor of a lift, as shown in the diagram below.

The reading on the scale is largest when the lift moves …

A upwards at a constant speed.
B downwards at a constant speed.
C upwards at a increasing speed.
D downwards at a increasing speed. (2)

1.3 An object is projected vertically upwards. Ignore air resistance.

As the object rises, its velocity …

A and acceleration are both directed upwards.
B and acceleration are both directed downwards.
C is directed upwards, but its acceleration is directed downwards.
D is directed downwards, but its acceleration is directed upwards. (2)

1.4 Ball P and ball Q, of the same mass, are dropped onto a concrete floor.
Both balls hit the concrete floor at the same speed, v. Ball P rebounds with
the same vertical speed, v, but ball Q rebounds with speed ½v.
Refer to the diagram below. Ignore air resistance.

Which ONE of the following statements regarding the collision of EACH ball
with the concrete floor is CORRECT?

A Kinetic energy is conserved for both balls P and Q.
B The change in momentum of ball P is greater than that of ball Q.
C The contact time with the floor is the same for both balls P and Q.
D Momentum is conserved for the collision of ball P, but not for that of ball Q. (2)

1.5 If the net work done on a moving object is POSITIVE, then we can conclude
that the kinetic energy of the object …

A is zero.
B has increased.
C has decreased.
D has not changed. (2)

1.6 The spectrum produced by a moving asteroid, as observed from Earth, indicates that the light has shifted towards the blue end of the spectrum.

Which ONE of the following frequency combinations of the observed light and the distance between the asteroid and Earth is CORRECT?

1.7 Three charged spheres X, Y and Z, supported by insulating threads of equal length, hang from a beam, as shown in the diagram below.
Sphere X is negatively charged.
Sphere X attracts sphere Y, but repels sphere Z

Which ONE of the following conclusions is CORRECT?

A Sphere Y is positively charged and sphere Z is negatively charged.
B Sphere Y is positively charged and sphere Z is positively charged.
C Sphere Y is negatively charged and sphere Z is negatively charged.
D Sphere Y is negatively charged and sphere Z is positively charged. (2)

1.8 In the circuit diagrams below, the cells and resistors are identical. The cells have negligible internal resistances.

The power dissipated in resistor X is P. The power dissipated in resistor Y
is …

A ¼P
B ½P.
C 2P.
D 4P. (2)

1.9 Which ONE of the following actions will NOT cause an increase in the
induced emf in a coil if the coil is rotated in a uniform magnetic field?

A Rotating the coil faster
B Increasing the strength of the magnetic field
C Increasing the number of turns of the coil
D Replacing the coil with a coil of lower resistance (2)

1.10 A learner writes the following statements about the emission spectrum of light
in a notebook:
(i) An emission spectrum is formed when certain frequencies of
electromagnetic radiation pass through a cold gas.

(ii) The lines in the emission spectrum of an atom have the same frequency as the corresponding lines in the atom’s absorption spectrum.

(iii) An emission spectrum is formed when the atom makes transitions from a high-energy state to a lower energy state.

Which ONE of the following combinations of the statements above is
CORRECT?

A (i) only
B (ii) only
C (ii) and (iii) only
D (i) and (iii) only (2)

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