# Question 1

Various options are provided as possible answers to the following questions.  Each question has only ONE correct answer. Choose the answer and write only the  letter (A–D) next to the question number (1.1–1.10) in the ANSWER BOOK,  for example 1.11 E.

1.1 Which ONE of the following pairs of physical quantities is vector quantities?

A) Force and distance

B) Velocity and speed

C) Charge and electric field

D) Electric field and force (2)

1.2 Which ONE of the following vector diagrams represents three forces acting on  an object simultaneously while the object moves at CONSTANT VELOCITY?

(2)

1.3 A block with a mass of 4 kg is pulled upwards along a frictionless slope, inclined at an angle θ, with a force F, as shown in the sketch below.

Which ONE of the following equations can be used to calculate the magnitude  of the normal force (N)?

A) N = (4)(9,8)sinθ

B) N = F – (4)(9,8)cosθ

C) N = F + (4)(9,8)cosθ

D) N = (4)(9,8)cosθ (2)

1.4 A satellite orbits Earth at a height where the gravitational force is a quarter  (¼) of the force it experiences on the surface of the Earth. If the radius of  Earth is R, the height of the satellite ABOVE THE SURFACE of Earth is …

A) 4

B) 2

C)

D) ½R (2)

1.5 A light ray passes from glass to air. The angle of incidence is 35°. The critical  angle of glass is 38°.

The light ray will undergo …

A) diffraction.

B) refraction and bend away from the normal.

C) total internal reflection.

D) refraction and bend towards the normal. (2)

1.6 The path of a light ray passing from air through a rectangular Perspex block is  shown below.

The magnitude of angle θ will be …

A) less than 39°.

B) equal to 39°.

C) equal to 51°.

D) equal to 90°. (2)

1.7 A monochromatic red light ray passes through a single slit of width d.  The diffraction pattern is projected on a screen. The red light is then replaced  with monochromatic blue light and passed through the same single slit.

The degree of diffraction will …

A) increase because the degree of diffraction is directly proportional to  wavelength.

B) decrease because blue light has a shorter wavelength than red light.

C) increase because blue light has a longer wavelength than red light.

D) decrease because the degree of diffraction is inversely proportional to wavelength. (2)

1.8 A negative charge of 1 µC, which is free to move, is placed at a distance 2r  from a positive charge of 4 µC.

Which ONE of the following statements regarding the -1 µC charge, when it is  at distance r, is CORRECT?

The electrostatic force experienced by the -1 µC charge will …

A) remain the same.

B) be halved.

C) be doubled.

D) increase four times. (2)

1.9 A circular coil is placed inside a magnetic field and rotated clockwise to  induce an emf. Which ONE of the following changes will increase the induced  emf?

A) Rotating the coil slower

B) Decreasing the number of turns/windings of the coil

C) Increasing the speed of rotation of the coil

D) Changing the polarity of the magnets (2)

1.10 In the circuit diagram below, the battery has negligible internal resistance.  The resistance of the ammeter and wires may also be ignored.

The reading on voltmeter V3 will be equal to …

A)  V1

B)  ½ V1

C)  V1 + V2

D)  V2 – V1 (2)

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