# Question 1

MULTIPLE-CHOICE QUESTIONS

Various options are provided as possible answers to the following questions. Write down the question number (1.1–1.10), choose the answer and make a cross (X) over the letter (A–D) of your choice in the ANSWER BOOK.

EXAMPLE:

1.1 The tendency of an object to remain at rest or to continue in its uniform motion in a straight line is known as …

A inertia.
B acceleration.
C Newton’s Third Law.
D Newton’s Second Law (2)

1.2 The mass of an astronaut on Earth is M. At a height equal to twice the radius of the Earth, the mass of the astronaut will be …

A ¼M
B 1⁄9M
C M
D 2M (2)

1.3 An object is thrown vertically upwards from the ground.

Which ONE of the following is CORRECT regarding the direction of the acceleration of the object as it moves upwards and then downwards? Ignore the effects of air resistance.

1.4 A person drops a glass bottle onto a concrete floor from a certain height and the bottle breaks. The person then drops a second, identical glass bottle from the same height onto a thick, woollen carpet, but the bottle does not break.

Which ONE of the following is CORRECT for the second bottle compared to
the first bottle for the same momentum change?

1.5 A block of mass m is released from rest from the top of a frictionless inclined plane QR, as shown below.

The total mechanical energy of the block is EQ at point Q and ER at point R. The kinetic energy of the block at points Q and R is KQ and KR respectively.

Which ONE of the statements regarding the total mechanical energy and the kinetic energy of the block at points Q and R respectively is CORRECT?

1.6 The diagram below shows the positions of two stationary listeners, P and Q, relative to a car moving at a constant velocity towards listener Q. The hooter on the car emits sound. Listeners P and Q and the driver all hear the sound of the hooter.

Which ONE of the following CORRECTLY describes the frequency of the sound heard by P and Q, compared to that heard by the driver?

1.7 Two charges, + Q and – Q, are placed a distance d from a negative charge – q. The charges, + Q and – Q, are located along lines that are perpendicular to each other as shown in the diagram below.

Which ONE of the following arrows CORRECTLY shows the direction of the net force acting on charge – q due to the presence of charges + Q and – Q?

1.8 Learners investigate the relationship between current (I) and potential difference (V) at a constant temperature for three different resistors, X, Y and Z.

They obtain the graphs shown below.

The resistances of X, Y and Z are RX, RY and RZ respectively.

Which ONE of the following conclusions regarding the resistances of the resistors is CORRECT?

A Rz > RY > Rx
B RX = RY = RZ
C RX > RY > RZ
D RX > RY and RY < RZ (2)

1.9 Which ONE of the following changes may lead to an increase in the emf of an AC generator without changing its frequency?

A Decrease the resistance of the coil.
B Increase the area of the coil.
C Increase the resistance of the coil.
D Decrease the speed of rotation. (2)

1.10 The wavelength of a monochromatic light source P is twice that of a monochromatic light source Q. The energy of a photon from source P will be … of a photon from source Q.

A a quarter of the energy
B half the energy
C equal to the energy
D twice the energy (2)