Biology
What is the chemical formula for glucose
C6H12O6
What is the conservation of energy
Energy is not created or destroyed, total energy of a system remains constant
What is the chemical formula of copper sulfate
CuSO4
What is the units of moment of a force
N m
In chemistry, acids and bases are fundamental concepts. When an acid is dissolved in water, it produces hydrogen ions (H⁺). Which statement correctly describes the behavior of acids and bases in an aqueous solution?
■ A) Acids taste bitter, while bases taste sour
■ B) Acids have a pH greater than 7, while bases have a pH less than 7
■ C) Acids release H⁺ ions, while bases release OH⁻ ions in solution
■ D) Acids turn litmus paper blue, while bases turn it red
C
Define osmosis
the net movement of water molecules from a region of higher water potential to a region of lower water potential through a partially permeable membrane
A ball of mass 1000g falls of a table with initial speed of 5 m/s, it takes the ball 5s to reach the ground what friction force led the ball to stop
F = ma
a = 5/5 = 1
F = 1kg*1 = 1N
What is an exothermic reaction?
A reaction where heat is released to the surroundings
When we exercise intensely, our muscles can switch from aerobic respiration (using oxygen)
to anaerobic respiration (without oxygen) to produce energy.
What byproduct is produced in muscles during anaerobic respiration in the body?
Lactic acid
The periodic table organizes elements in a manner that reveals trends and patterns. As you move from left to right across a period, which statement best describes the trend in atomic radius, and what underlying atomic structure influences this trend?
A) The atomic radius decreases due to increased nuclear charge attracting electrons more strongly
B) The atomic radius increases because additional electron shells are added
C) The atomic radius remains constant as electrons are added to the same energy level
D) The atomic radius fluctuates with no clear trend due to electron-electron repulsions
A
Deoxygenated blood comes from the vena cava, What path will the blood take to the lungs (include parts of the heart)
From vena cava to the right atrium, passes through atrioventricular valves to the right ventricle, which then go to the semilunar valves towards the pulmonary artery
What type of wave is sound? A sound wave travels through water with a speed of 300 m/s. If the wavelength of the sound wave is 2 meters, calculate the frequency of the sound wave.
Longitudinal
f = 300/2 = 150Hz
In the electrolysis of concentrated aqueous NaCl, what is produced at the anode and cathode
cathode: H2 gas
anode: Cl2 gas
When an object is in motion, it tends to stay in motion unless acted upon by an external force. Which of Newton's laws of motion describes this principle, highlighting the relationship between an object’s state of motion and forces?
A) First Law
B) Second Law
C) Third Law
D) Law of Universal Gravitation
A) First law
In the context of equilibrium reactions, the concept of dynamic equilibrium describes a state in which the rate of the forward reaction equals the rate of the reverse reaction. If a chemical reaction at equilibrium is subjected to an increase in temperature, how does Le Chatelier's principle predict the system will respond to the change?
A) The equilibrium shifts toward the endothermic direction
B) The equilibrium shifts toward the exothermic direction
C) The equilibrium remains unchanged regardless of temperature changes
D) The direction of the shift cannot be determined without additional information
A
What are the properties of a red blood cell, and what gives it the red colour?
Small enough to squeeze through capillariesNo nucleus or mitochondria so more space for packing haemoglobin
Biconcave disks
Carry oxygen
Large surface area which speeds up rate at which oxygen can diffuse in and out the RBC
Haemoglobin provides red colour
What's the momentum of a ball of mass 250g thrown at a speed of 4m/s
P = mv
P = 0.25*4 = 1 kgm/s
Fe2O3 + 3CO —> 2Fe + 3CO2
What is the oxidising and reducing agent
A 60 kg person decides to run up a flight of stairs that is 5 meters high in 10 seconds. Assume that gravity is 10 m/s. What is their average power output? (with units)
P = E/t
P = (60×10×5)/10
= 300 W
In organic chemistry, functional groups determine the chemical properties of molecules. If a molecule contains a hydroxyl group (-OH) and a carbonyl group (C=O) within its structure, which type of functional group does this molecule belong to, and how does this structural feature influence its solubility in water?
A) Alcohol; it increases solubility due to hydrogen bonding
B) Ketone; it decreases solubility due to steric hindrance
C) Aldehyde; it has no impact on solubility
D) Carboxylic acid; it increases solubility due to polarity
D
The mitochondria are often referred to as the powerhouses of the cell due to their role in generating adenosine triphosphate (ATP). Which cellular process takes place within these organelles, leading to energy production?
A) Photosynthesis
B) Cellular respiration
C) Protein synthesis
D) Glycolysis
B) Cellular respiration
In physics, the concept of work is defined as the product of force and displacement. If a force of 10 N is applied to move an object 5 meters in the direction of the force, what is the total work done on the object?
A) 10 J
B) 15 J
C) 50 J
D) 100 J
C) 50 J
Diamond is a hard shiny compound made from carbon, describe the shape of the compound, and the angle between each bond
Tetrahedral shape, each bond angle is 109.5 degrees
In the study of motion, Newton’s laws of motion describe the behavior of objects. If an object experiences a net force resulting in acceleration, how does this relationship define the concept of inertia, and what implications does it have for the object’s motion?
A) Inertia increases with mass, making it harder to change the object’s motion
B) Inertia is independent of mass and only depends on velocity
C) Inertia decreases with acceleration, making motion easier to change
D) Inertia applies only to objects in motion, not at rest
Inertia increases with mass, making it harder to change the object’s motion
There are 500 kg of cucumbers composed of 99% water, by mass. After some of the water evaporates, the cucumbers are now 98% water by mass. What is the new total weight of the cucumbers, in mass?
Mass = 250kg