1 Which of the following physical quantity is a vector quantity? flag bookmark A Thermodynamic temperature B Kinetic energy C Electric current D Weight T4 Chapter 1.1 Physical Quantities Weight is a force, so it has both magnitude and direction: a vector quantity. Temperature, kinetic energy and electric current are scalars.
2 Diagram 1 shows a graph of the change in kinetic energy of photoelectrons released from lithium metal at different light frequencies. From the graph, determine the kinetic energy of lithium when its light frequency is $8 \times 10^{14}$ Hz. flag bookmark A 1.0 eV B 1.2 eV C 2.0 eV D 2.2 eV T5 Chapter 7.3 Einstein's Photoelectric Theory Reading the graph at a frequency of 8 × 10¹⁴ Hz gives a kinetic energy of 1.2 eV.
3 Diagram 2 shows a student runs from point X to Y then back to point Z. Displacement of student is represented by flag bookmark A XY B XZ C ZY D YZ T4 Chapter 2.1 Linear Motion Displacement is the straight-line distance from the starting point to the final position, in a stated direction: from X to Z.
4 Diagram 3 shows a velocity, v against time, t graph of a toy lorry. Which of the following comparison is correct? flag bookmark A Acceleration OA is higher than BC B Acceleration OA is lower than BC C Acceleration AB is higher than BC D Acceleration OA same with BC T4 Chapter 2.2 Linear Motion Graphs Acceleration is the gradient of the v–t graph. Section OA is steeper than BC, so the acceleration in OA is higher.
5 Diagram 4 shows feather and ball bearing dropped at the same time from the same height. Feather and ball bearing will reach the ground at the same time if flag bookmark A the density of both objects are the same B the shape of both objects are the same C the weight of both objects are ignored D the air resistance is ignored T4 Chapter 2.3 Free Fall Motion Without air resistance, both objects fall freely with the same acceleration g, so they reach the ground at the same time whatever their mass or shape.
6 Diagram 5 shows an airplane needs a long runway to touch down. The situation can be explained by flag bookmark A Newton's Universal Law of Gravitation B Newton's First Law of Motion C Newton's Second Law of Motion D Newton's Third Law of Motion T4 Chapter 2.4 Inertia A landing aeroplane has a large mass and therefore large inertia, so it tends to keep moving and needs a long runway to stop: Newton's first law of motion.
7 Diagram 6 shows a pair of clackers that uses two hard plastic balls. The clackers ball produces a loud clacking sound when collide at high velocity. Why is hard plastic used? flag bookmark A Increase inertia B Increase friction C Decrease momentum D Decrease time of impact T4 Chapter 2.7 Impulse and Impulsive Force Hard plastic balls stay in contact for a very short time when they collide, so the impulsive force is large and the clack is loud: F = Δp/t.
8 Diagram 7 shows an astronaut wearing a space suit with mass 82 kg. He discovered that walking on the surface of Moon is easier compared to the surface of the Earth while wearing the same suit. Which statement explains the above situation correctly? flag bookmark A The gravitational field strength on the Moon is higher B The weight of the space suit is lower on the Moon C Mass of space suit is higher on the Moon D The mass of the astronaut is lower on the Moon T4 Chapter 2.8 Weight The Moon's gravitational field strength is about one-sixth of the Earth's, so the suit's weight W = mg is lower on the Moon, even though its mass is unchanged.
9 Which statement is correct about Kepler's Second Law? flag bookmark A A line that connects a planet to the Sun sweeps out equal areas in equal times when the planet moves in its orbit B The orbit of each planet is elliptical with the Sun at one focus C The square of the orbital period of any planet is directly proportional to the cube of the radius of its orbit T4 Chapter 3.2 Kepler's Laws Kepler's second law: the line joining a planet to the Sun sweeps out equal areas in equal times. B is the first law and C is the third law.
10 Diagram 8 shows a rocket being launched to send man-made satellite to outer space. Why does the rocket need a large quantity of fuel for launching? flag bookmark A Produce high thrust that enables the rocket to achieve the escape velocity of the Earth B Produce high velocity to move further C Produce larger momentum D Overcome the bigger mass of the rocket T4 Chapter 3.3 Man-made Satellites The rocket needs a very large thrust to reach the escape velocity of the Earth (about 11.2 km s⁻¹), so it must burn a large amount of fuel.