Physics & Astronomy
What is Astronomy?
A) the study of zodiac signs
B) the study of food
C) the study of stars like Freddie Mercury
D) the study of stars like the Sun
A is astrology
B is gastronomy
C is being a over-enthusiastic fan
D is correct
What statement about bromine is correct?
A)Br2 is insoluble in non-polar solvents
B)Br2 vapour is more dense than air
C)Br2 will not vapourize significantly under normal conditions
D)Gaseous bromine is purple
B
During transpiration, what is the site of evaporation of water in the leaves?
A air spaces
B guard cell walls
C mesophyll cell walls
D stomata
C mesophyll cell walls
What is the difference between the face value of a number, and the place value of the number? Use an example
The face value is just the number itself.
The place value, however, depends on the position, like the hundreds place or the thousands.
Theoretically speaking, if I were to throw an orange at 5m/s from my spaceship, 408 kilometers from the Earth's surface, what speed would it reach just before hitting Earth's surface?
v2 = u2 +2as
v2 = 8004985, so v = 2830 m/s
X is a group 2 metal. It forms a sulfate which is more soluble than barium sulfate. It forms a hydroxide which is more soluble than calcium hydroxide.
What could be the identity of X
Strontium
Magnesium
Beryllium
Strontium
Which disease is not likely to be passed directly from parents to child?
A cholera
B malaria
C sickle cell anaemia
D tuberculosis
B malaria
What is (a - b)3 ?
a3 - b3 - 3a2b + 3ab2
What did Einstein believe the 4th dimension to be?
Time
Methyl butanoate, C5H10O2, is an ester used in the food industry to give products the flavour of apples.
Including methyl butanoate, how many structural isomers are there of C5H10O2 that are esters?
A)6
B)8
C)9
D)10
C)9
Which plant cells do not contain a nucleus?
1 companion cells
2 sieve tube elements
3 xylem vessel elements
2&3
Which of the following cannot be a value of sin(x)
A: (√5)/2 B: (2√2)/4
C: (√3)/2 D: -1
A
Newton thought of gravity as a force that attracts objects to each other... What did Einstein believe gravity was?
Gravity is the curving/warping of space
The three minerals below are obtained from mines around the world. Each one behaves as a mixture of two carbonate compounds. They can be used as fire retardants because they decompose in the heat, producing CO2.
barytocite BaCa(CO3)2
Dolomite CaMg(CO3)2
Huntite Mg3Ca(CO3)4
What is the order of effectiveness as fire retardant of the 3 minerals from best to worst?
Huntite Dolomite Barytocite
Which statement correctly compares blood plasma and tissue fluid in a healthy person?
A Blood plasma contains more protein than tissue fluid.
B Both blood plasma and tissue fluid contain red blood cells.
C Tissue fluid contains white blood cells whereas blood plasma does not.
D Tissue fluid is formed from blood plasma and is not returned to blood plasma.
A Blood plasma contains more protein than tissue fluid.
So, I need 1000 dollars quick. Don't ask why. Which offer should I take?
A: 1000 dollars with a 5% compound interest per year for 5 years.
B: 2000 dollars with a 3% compound interest per quarter for 2 years.
(that extra 1000 dollars though O-O, but I'd rather use it to pay B back in the future)
well, A means that I will have to pay back 1276 dollars.
on the other hand, B will make me pay 2252 dollars, but I still have that 1000 dollars, so i actually only need to pay an extra 1252 dollars
What is the closest galaxy to the center of the Milky Way?
A) Andromeda
B) Virgo Stellar Stream
C) Canis Major Dwarf
D) Sagittarius Dwarf Elliptical Galaxy
Canis Major Dwarf Galaxy
Two glass vessels M and N are connected by a closed valve. M contains helium at 20C at a pressure of 1x105 Pa. N has been evacuated and has three times the volume of M. In an experiment, the valve is opened and the temperature of the whole apparatus is raised to 100C.What is the final pressure of the system?
(PV=nRT where P is pressure of an ideal gas(Pa), V is volume (m3), n is number of moles of gas, R=8.314, T is kelvin temp)
A) 3.18x104 Pa
B)4.24x104 Pa
C)1.25 x 104 Pa
D)5.09 x 105 Pa
A)3.18 x 104 Pa
When investigating the rate of reaction of the enzyme lipase on the hydrolysis of triglycerides, the pH must be maintained at an optimum to prevent the lipase denaturing. What is the reason for this?
A The addition of water molecules produced by hydrolysis increases pH.
B The products of hydrolysis decrease the pH.
C The products of hydrolysis increase the pH.
D The removal of water molecules used in hydrolysis decreases pH.
B The products of hydrolysis decrease the pH.
So, I currently have 690 pounds of oranges that conveniently costed a 1000 dollars. An orange is roughly half a pound ( in weight, not price). Now I need to fit them in a spaceship. Each orange is about 6 centimeters in diameter. There is not much space in my spaceship in space, so how much space do these oranges occupy?
they would occupy 156074 cm3 or .156 m3