Practice Test (UPCAT) - Science

the solvent

In a solution the substance that does the dissolving is called _________

Water is a good solvent due to its polarity and small molecular size

Water is a good solvent because

a saturated solution

A solution that cannot hold any more solute at room temperature would be

a solution between two niscible liquids

Ethanol dissolved in water would be an example of ________

reducing the amount of solute

To form a supersaturated solution requires

sugar dissolving in water

Which one of the following is an example of a physical change?

boiling on egg

Which one of the following is not a physical change?

have properties different to the chemicals before the change.

The chemicals after a chemical change

The Law of Definite Proportions.

Heptane is always composed of 84% carbon and 16% hydrogen by mass. What law does Ihis observalion illustrate?

21

Give Ihe mass number for an alom Ihal has 10 protons, 10 electrons, and 11 neutrons.

18.0 g

How much of subslance W will react with 9.0 g. of substance Z?

36.0 g

The amount of substance WZ Ihal wilI be produced from 12.0g of substance z assuming that substance W is in excess is

increased temperature and increased concentration of reactants?

Which conditions will increase the rate of chemical reaction?

supplies activation energy.

When a lit match is touched to Ihe wick of a candle, the candle begins to burn, When the match is removed, the candle continues to burn. In this reaction, the match

faster

Compared to a glass of ice water with ice in it, a glass of plain ice-cold water without ice on warm day will warm up

18 g

The solubbility of a substance was determined in 300 cm? water at different lemperalures and Ihe lollowing is part of Ihe graph obtained: In 150 cm3 water, how much of the
substance will dissolve at 75˚ C?

Sodium chloride dissociales when placed in water

After studying the illustration above, one may conclude that

when ions are present they allracled lo eleclrodes having opposile electrical chorges are

One may also conclude that ________

its temperature is halved

If the volume of a gas at a certain pressure is halved,

inertia

Unless an object al rest is acted upon by a force, it stays ot rest due to its

22.5 km

Maron rode on his bike from 9:00 am to 10:30 am. If he drove at an average speed of 15kph, what was the total distance he covered?

has the same magnitude as the total force which resisls Ihe molion of Ihe box.

A woman exerts a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at constant velocity. The constant force by the woman

immediately start slowing to a stop.

If the woman in question 23 suddenly stops applying a horizontal forcc to the box, then the box will

decrease the mass of the block on the end of the spring

The 0.20 kg block allached lo a spring which has a spring constant of 20 N/m. block is initially stretched 0.10 meters and released at time t 0 seconds. Complete the following statement: In order to increase the frequency of motion, one would have to

unbalanced force

The acceleration in a body is due to

Student B did twice as much work climbing the tower

Two studenls are posed lo dive off equal height diving towers to a swimming pool below. Student B is twice as massive as student A. Which of the following is true?

(2) only

Which of following cases is/are NOT a uniformly accelerated motion?
(1) A feather falls from a certain height inside a vaCuum tube. (2) A ball rolls along a frictionless plane at uniform speed.
(3) A coin falls from a certain height in gir but air resistance is negligible.

cube C has Ihe highesl densily

From the illustration, one can conclude that

ils weight is greater Ihan Ihe weight of the water it has displaced

Cube c sinks because

downward and toward the wall

In the figure that follows, what is the direction of the force exerted by the ladder?

200 J

A 200 N box is pushed up an incline that is 5.00 m long and rises 1.00 m. If the incline is friclionless, then the work done by the pushing force is

4000 W

A 2000 kg car accelerates from rest to a velocity of 20 m/s in 10 seconds. The power of the engine during this acceleration is

most wavelength of the visible spectrum except red

A gem or mineral that is red absorbs

not at all

When viewed straight down (90° to the surface), an incident light ray moving from the water to air is refracted

the particles of perfume spread from an area ol higher concenlralion, Iheir wrisl, to greas of lower concentration, the gir

Someone is wearing perfume on their wrist. Why can people near them smell it?

All Ihree will run oul al he same lime.

Your flashlight has three identical 1.5 volt batteries total of 4.5 volts. Current passes first through battery (a), then through battery (b), then through baltery (c), on ils way to When you operate the flashlight, the batteries provide power to the current and they gradually use up their chemical potential energy. Which battery will run out of chemical potential energy first? in it, arranged in a chain to give a Ihe bulb.

E is radialion and F is conveclion.

The figurc shows radiation heater. What heat transfer processes are involved at positions E and F?

2kg 20N

An astronaut picks up a stone on the moon and finds its mass to be 2 kg. If the mass of the earth is 6 times more than the mass of the moon, what will the mass and the weight of the stone be on the earth?

It is unpredictable because the balloon is flexible,

Water is boiled in a flask with a balloon over the top. As the water heats, the balloon expands. What has happened to the weight of this flask and balloon in this experiment?

use water displacement

A student wishes to find the density of an irregular piece of rock. How will she find volume?

It would fall,

A barge filled with scrap iron is in a canal lock. If the barge were to sink what would happen to the water level?

(1.6/9.8) h

Suppose you have a pendulum clock which keeps correct time on Earth (acceleration duc to gravity = 9.8 m/s2). Without changing the clock, you take it to the Moon (acceleration due to gravity = 1.6 m/s2). For every hour interval (on Eorth) the Moon clock will record.

becomes cooler and less luminous

As a star exhausts hydrogen in its core, it

gnomon

An upright slick that is allowed to cost a shadow in sunlight is colled

when the sun is near the line of nodes of the moon and the moon is new or full

A solar or lunar eclipse will occur_ .

The Iraveling bullel wil hil Ihe ground al the same time as the bullet dropped from rest

How much time should it take for a traveling bullet to hit the ground compared to a bullet dropped from rest? Assume the ground remains flat for the entire diştance the bullet may travel.

the lit candle left uncovered

Bart placed four identical candles on a table and lit them. He covered the first candle with a big jar, the second with a medium-sized jar, and the third with small jar. He left the last candle uncovered. Which candle probably took the longest time to burn?

wheelbarrow

Which of the following is nol considereda simple machine?

USA

Which country shows the greatest rate of increase over the years?

Kuwait

The graph below shows the number of OFW's in which country?

10°C

The freezing point of this substance is

30°C

The boiling point of the substance is

4h and 6 minutes

The substance undergoes a phase change belween the

3000

How mony calories completely melt the sample at its melting point? are needed lo

16 min.

How long did it take for the substance to completely turn into gas?

2 min,

The subslance is solid at

6000

How mony calories are needed lo completely change the sample into a liquid?

the parlicles of a suspension will sink out if left over time to rest

What factor distinguishes a suspension trom a colloid?

Pot B will wcigh morc than Pot A

Lorna placed 1 kg of sandy soil and 1 kg clay soil into Pot A and Pot B respectively. She Ihen poured equal volumes of woler into each pot. Atter a day, it is expected that

kinetic energy, but more speed.

Hydrogen and oxygen molecules in a gas sample have the same temperature. This means the hydrogen molecules, on the averago, have the same

Torm hydronium ions when dissolved in water

Acids are substances that

tenderize meat

Marinades for meat commonly include acids such as vinegar or wine, becouse the acids can

distillation

The basic requirement for the separation of the components by composition of the vapor be different from the composition of the liquid at the boiling point of the liquid. is that the

Conservation of Mass

Taken by itself, the fact that 8.0 g of oxygen and 1.0 g of hydrogen combine to give 9.0 of water demonstrates whoat natural law?

1, 3, 1,3

What are the coefficients that will balance the formula equation below?

AlCla + NaOH → Al(OH]; + NoCl

alkene

A hydrocarbon that contains one or more double bonds is classified as a(n)

endothermic, positive

When heat is absorbed by the system from the surroundings, the process is said to be and the sign of process is

evidence of artificial selection in domestic animals

Which of the following did not help Darwin formulate his theory of evolution?

the front flipper of a porpoise and a human arm

Which of the following pairs are analogous structures?

cells

Of the following biological levels of organization, which represents the smallest or lowest level?

regulating materials that enter or leave the system

Which of the following is not a property of life?

C

The kinetic energy of the pendulum is highest at position(s).

A and E

Speed is minimum at position(s)

The germs changed their genetic code in order to gyoid problems with the antibiotic.

The sexually-transmitted disease gonorrhea is becoming difficult to treat because the causative bacteria are evolving re to antibiotics. For example, in Hawaii between 1997 and 1999 resistance to fluoroquinolones increased from 1.4 percent lo 9.5 percent. Scientists alIribule this to natural selection. What does naturo! seiection mean in this context?

capsule

A slippery outer covering in some bacteria that protects them from phagocytosis by hosl cells is

prokaryolic cells have more complex cell walls

Dillerences belween eukaryolic and prokaryotic cells include all of the following except

it grows with the shortest generation time

The optimum temperaturc for an organism is the one at which

C is less than B but denser than A.

In the illustration below, A and B are liquids while C is a solid. Which of the following is true?

В

At which point is the car decolerating?

В

At which point is the car accelerating rapidly?

leaves, roots, seeds

In a plant, what part stores sugars as starch?

all energy-requiring processes in cells

ADP energy is used for

give Ihe cell shape,
anchor organelles,
allow organelles to move

The cytoskeleton of the cell functions to

over 2O

A rcd rod blood coll plasma mombranc contains __________ different types of proteins.

metaphase

During ____________, the chromosomes attach to Ihe spindle and align al Ihe melaphase plate of the spindle.

chance of , long wings = 3/4

If two flies heterozygous for wing length and body color are crossed, which of the following are possible results?

A

In the diagrom, assume that each conlainer contain equal volumes of water, In what container is the pressure at the bottom greatest?

A

At which point on the door will you apply the greatest force to close it?

B

Graphs of distance (d) or velocity (v) of a body against time (1) are shown. Which one shows that of a body is at rest?

В.

Which of the velocity lime graphs in the figure represents an object falling freely in a vacuum? (v = velocity, t = time)

А.

In the following illustration, the pendulum was swinging in the direction indicated by the arrow when its string was suddenly cut, in what direction did the pendulum go?

В

In a river, if the waler flows in the direclion indicated by the arrows in the illustration below, at which point is the flow fastest?

dihybrid

A cross in which true-breeding plants differ in Iwo Irails is known as a _____________ cros.

realized niche of an organism

Which is narrower?

Sporozoa

_________ are protozoa with no means of locomotion.

- is a living tissue which grows with the animal.
- protects internal orgoans.
- serves as a place of attachment for muscles.

The vertebrale skelelorn __________

a wall.

Protoplasts are cells without _________.

D

Which of the following graphs shows the
temperature-volume relationship for a gas?
(T = temperature and V = volume)

C

Which of the graphs shows a body moving
at high acceleration at the beginning then
starts to lose acceleration towards the end?

D

Which of the graphs shows a body moving
at constant speed?