Chem zone
1 Which one of the following elements has the highest ionisation energy?
A Potassium
B Lithium
C Caesium
D Sodium
B Lithium
1 Two objects are dropped from the same height, one heavier than the other. Ignoring air resistance, which hits the ground first?
A Both at the same time
B The heavier object
C It depends on their shape
D The lighter object
A-Both at the same time
1 Why can electromagnetic waves travel through a vacuum, but sound waves cannot?
A Sound waves are slower
B Electromagnetic waves are higher amplitude
C Sound waves are longitudinal
D Electromagnetic waves require no medium; sound waves do
-D Electromagnetic waves require no medium; sound waves do
1 In electrostatics, what causes the phenomenon of induction?
A Contact between two charged objects
B Movement of electrons without direct contact
C Transfer of protons
D Flow of current
B Movement of electrons without direct contact
1 A machine is said to have a power rating of 1000 W. What does this mean?
A It uses 1000 J of energy
B It can do 1000 J of work every second
C It stores 1000 J of energy
D It loses 1000 J as heat
B It can do 1000 J of work every second
2. An element has one electron in its outermost energy level.
The element is a/an:
A. Halogen
B. Noble gas
C. Alkali metal
D. Alkaline earth metal
C. Alkali metal
2 Which of the following best explains why seat belts are important in a car crash?
A They reduce the net force on the passenger
B They increase the acceleration
C They prevent the car from moving
D They provide an unbalanced force to stop the passenger safely
A -They reduce the net force on the passenger
2 A wave travelling from deep water to shallow water changes in speed and wavelength but not frequency. Why?
A Medium doesn’t affect frequency
B Frequency depends only on the source
C Energy is conserved
D Wavelength is constant
B-Frequency depends only on the source
2 When a charged object is grounded, what happens?
A Its charge increases
B It starts rotating
C It discharges to zero
D It gains mass
C It discharges to zero
2 Why do roller coasters start with a big climb? A To build up friction
B To slow the ride down
C To maximize gravitational potential energy D To decrease total energy
C To maximize gravitational potential energy
3 The chemical formula of iron (III) sulphate is...
A FeS
B FeSO4
C Fe2(SO4)3
D Fe3(SO4)2
C -Fe2(SO4)3
3 An astronaut in space throws a tool away. What happens to the astronaut?
A They remain stationary
B They move with the tool
C They move in the opposite direction of the tool
D They float higher
C They move in the opposite direction of the tool
3 In an electromagnetic wave, the electric and magnetic fields are:
A Parallel and in phase
B Perpendicular and in phase
C Parallel and out of phase
D Perpendicular and out of phase
B Perpendicular and in phase
3 In a circuit, the total voltage in a series connection is:
A Equal to the smallest voltage
B Equal to the highest voltage
C The sum of the voltages across each component
D Always zero
C The sum of the voltages across each component
3 In a wind turbine, what is the primary energy transformation that occurs?
A Electrical to sound
B Kinetic to electrical
C Potential to chemical
D Sound to light
B Kinetic to electrical
4 Which type of bond generally has the strongest attraction?
A Ionic bond
B Covalent bond
C Hydrogen bond
D Van der Waals forces
B- Covalent bond
4 If you throw a ball straight up inside a moving train (assuming no air resistance), where will it land?
A Right back in your hand
B In front of you
C Behind you
D Impossible to know without the direction of the train
A -Right back in your hand
4 Which of these waves has the highest frequency?
A Radio waves
B Infrared waves
C Visible light waves
D Gamma rays
D Gamma rays
4 Which arrangement ensures that a bulb in a circuit glows even if one other bulb blows out?
A Series only
B Parallel only
C Series-parallel mix
D None of the above
B Parallel only
4 In a pulley system, the input energy is 200 J, but the output energy is only 150 J. What is the efficiency?
A 125%
B 100%
C 25%
D 75%
D-75%
6 Which of the following solution will conduct electricity? A Oil solution
B Oxygen gas bubbled in water
C Table salt solution
D Sugar solution
C Table salt solution
5 Which of these is NOT an example of projectile motion? A A ball is thrown straight up
B A car driving around a bend
C A soccer ball kicked at an angle
D Water from a fountain
B -A car driving around a bend
5 What wave property is the distance between two successive points in phase? A Period
B Amplitude
C Wavelength
D Frequency
C- Wavelength
5 When the number of field lines is high in a region, the field is:
A Zero
B Weak
C Unstable
D Strong
D Strong
5 During a lab, a student calculates more energy output than input. This suggests...
A The system is 100% efficient
B Energy was created
C A measurement error occurred
D Work wasn’t done
C A measurement error occurred