10895340
Descripción
Test por Jessa Garcia, actualizado hace más de 1 año
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Creado por Jessa Garcia
hace alrededor de 7 años
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Pregunta 1
Pregunta
Which is true?
Respuesta
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Bees die if they sting
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Bats can pick up radio signal
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Penguins can fly
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Owls can move theor eyes in their heads
Pregunta 2
Pregunta
Animals live on land but return to the water to breed.
Respuesta
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Mammals
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Amphibians
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Reptiles
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Crustaceans
Pregunta 3
Pregunta
The sun is mostly made up of which gas?
Respuesta
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Hydrogen
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Oxygen
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Nitrogen
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Helium
Pregunta 4
Pregunta
On the following metric units which is the smallest
Respuesta
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Millimeter
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Centimeter
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Nanometer
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Micron
Pregunta 5
Pregunta
On the following elements which is the most common in the earth's crust?
Respuesta
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Aluminum
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Silicon
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Iron
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Calcium
Pregunta 6
Pregunta
Coral are animals that live in
Respuesta
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Deep sea vents
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Warm waters
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Cold polar waters
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All of the above
Pregunta 7
Pregunta
A rise in atmoshpheric temperature due to an increase in carbon dioxide, methane and other gases that trap heat in the atmoshpere is called____.
Respuesta
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Coriolis Effect
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Carbon cycle
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Green house effect
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El niño phenomenon
Pregunta 8
Pregunta
Suppose that a river has a channel cross section of 25 square meters and a flow speed of 6 meters per second. What is its discharge rate?
Respuesta
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6 m^3/ s
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25 m^3/ s
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150 m^3/ s
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300 m^3/ s
Pregunta 9
Pregunta
Which of the following determines the development of soil in a particular place?
Respuesta
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Climate
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Presence of plant and animal life
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The type of rock
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All are factors of soil development
Pregunta 10
Pregunta
The [blank_start]ozone layer[blank_end] is the region of the atmoshpere which absorbs harmful UV radiation.
Respuesta
-
ozone layer
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Ionosphere
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Heteroshpere
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Thermosphere
Pregunta 11
Pregunta
Troposphere is warmest near the Earth's surface because
Respuesta
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Lightning strikes the surface which in turn heats the layer above.
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The Earth's surface reradiates solar energy which heats the lower troposhere.
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Radioactive elements in the Earth's crust heat atmosphere abovr the ground.
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The air is most compressed there by the weight of the atmosphere.
Pregunta 12
Pregunta
Fog is a cloud with its base at or very near the ground. The formation of fog generally occurs after the ground has lost heat by
Respuesta
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Convection
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Transpiration
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Radiation
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Evaporation
Pregunta 13
Pregunta
Evaporation is the process by which a liquid changes into gas. In this process, liquid water molecules become
Respuesta
-
Tiny drops of water
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Molecules of water vapor
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Separate atoms of water
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Atoms of the hydrogen and oxygen
Pregunta 14
Pregunta
Thunderstorm is produce by a cumulonimbus cloud and is always accompanied by lightning and thunder. If you hear a clap of thunder a minute after seeing a flash of lightning, the distance between you and the lightning is about
Respuesta
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5km
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10km
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20km
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45km
Pregunta 15
Pregunta
Plant cells contain most of the same organelles and structures found in animal cells. The only difference is that plant cells have
Respuesta
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Vacuoles
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Plasma membrane
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Mitochondria
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A cell wall
Pregunta 16
Pregunta
An example of compound is
Respuesta
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Mercury
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Salt
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Carbon
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Oxygen
Pregunta 17
Pregunta
When matter is changed into another matter having different properties, the type of change is known as
Respuesta
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Physical change
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Electrical change
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Chemical change
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Atomic change
Pregunta 18
Pregunta
Baking soda produces carbon dioxide when mixed with
Respuesta
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Sour milk
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Flour
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Water
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Egg
Pregunta 19
Pregunta
The bubbling of softdrinks is due to
Respuesta
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Air dissolved in the liquid
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Carbon dioxide dissolved in liquid
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Alcohol in the liquid
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Sugar in the liquid
Pregunta 20
Pregunta
A gas which bacteria extract from air and change into a form which plant can use is [blank_start]nitrogen[blank_end].
Respuesta
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nitrogen
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oxygen
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argon
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CO2
Pregunta 21
Pregunta
Pressure is the pull or push exerted by a weight on a given unit of area. Since air has weight, it exerts pressure on all objects exposed to it.
Decreasing air pressure, air can be made to move from a [blank_start]high[blank_end] pressure region to a [blank_start]low[blank_end] pressure region.
Respuesta
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high
-
low
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low
-
another high
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same
Pregunta 22
Pregunta
Clouds are made up of
Respuesta
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water vapor
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dust particles only
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tiny droplets of water
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partially evaporated water
Pregunta 23
Pregunta
winds are caused by
Respuesta
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ocean currents
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the motions of the earth
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the waving of tree branches
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the unequal heating of the earth's surface
Pregunta 24
Pregunta
The movement of the wind is always from
Respuesta
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north to south
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east to west
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low pressure region to high pressure region
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high pressure region to low pressure region
Pregunta 25
Pregunta
Density of a substance is its mass per unit volume.
A piece of brass has a mass of 16.0 g and a volume of 1.9 cm³, Find its density.
Respuesta
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4.2 g/cm ³
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8.4 g/cm ³
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0.11875 cm ³
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12.6 g/cm ³
Pregunta 26
Pregunta
Heat is the total kinetic energy of all the molecules of an object and its measured in Calories or
Respuesta
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Newton
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Joules
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Centigrade
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Kelvin
Pregunta 27
Pregunta
The measure of the average kinetic energy of molecules is known as
Respuesta
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kinetic energy
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expansion
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heat of evaporation
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temperature
Pregunta 28
Pregunta
Which is true about light?
Respuesta
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Light has the property of waves only.
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Light is produced by excited atoms.
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Light striking your eyes will not allow you to see.
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Light energy cannot be measured.
Pregunta 29
Pregunta
The color of all objects depends on the light reflected from that color. Color is related to the frequency and ________.
Respuesta
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Doppler Effect
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Diffraction grating
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wavelength of light waves
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primary colors
Pregunta 30
Pregunta
All electric currents are streams of moving electrons. The path followed by an electric current is called _____.
Respuesta
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volt
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conductors
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potential difference
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circuit
Pregunta 31
Pregunta
A series of circuit is a single pathway for all electrons in a circuit.
A parallel circuit has two or more branches for electrons.
If all Christmas lights go out when one bulb is burned out, the lights are connected in _______.
Respuesta
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parallel circuit
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series circuit
Pregunta 32
Pregunta
Acceleration is the rate of change of velocity per unit time.
A car accelerates uniformly from 15 kph to 45 kph in 10 seconds. The acceleration is [blank_start]3 km/hr-sec[blank_end] .
Respuesta
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3 kph/second
Pregunta 33
Pregunta
The distance covered by an object that starts from rest and accelerates uniformly depends upon the square of the time elapsed. d = Vi + (1/2) gt²
An object starts from rest and falls freely under the force of gravity for 5 seconds. What distance has it fallen during this time?
Respuesta
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49 m
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24.5 m
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122.5 m
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1225 m
Pregunta 34
Pregunta
The acceleration of a body is directly proportional to the net force acting on the body and is inversely proportional to its mass.
What force would your arm have to exert to a bowling ball with a mass of 5 kg down an alley with an acceleration of 10 m/sec²?
Respuesta
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5 N
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5 kg
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50 N
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50 kg
Pregunta 35
Pregunta
The product of the mass and the velocity of a body is called its momentum (momentum = mv).
A gun having a mass of 5 kg fires a 20 g bullet at a speed of 500 m/sec. Find the recoil velocity of the gun.
Respuesta
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2 m/sec
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20 m/sec
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0.20 m/sec
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200 m/sec
Pregunta 36
Pregunta
Work in a physical science is equal to the force times the displacement in the direction of the force.
(W = Force x displacement)
A crate is pushed 5 meters on a level floor. The frictional force is determined as 300 N. Calculate the work performed.
Respuesta
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60 N-m
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15 N-m
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150 N-m
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1500 N-m
Pregunta 37
Pregunta
Potential energy or energy of position is the product if the weight if an object and the height to which the object is elevated.
A machine weighing 5000 N is raised onto the roof of a building 50 m high, The increase in potential energy is [blank_start]2.5 x 10^5 Joules[blank_end].
Respuesta
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2.5 x 10^5 Joules
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2.5 x 10^5 Newton
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2.5 x 10^4 Joules
-
2.5 x 10^4 Newton
Pregunta 38
Pregunta
A rocket with a mass of 1000 kg is fired vertically upward with an initial velocity of 100 m/sec. Calculate its potential energy when it reaches the maximum height.
Respuesta
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5 x 10 ^ 5 Joules
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5 x 10 ^ 5 N-m
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5 x 10 ^ 6 Joules
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5 x 10 ^ 6 N-m
Pregunta 39
Pregunta
A substance that gives up hydrogen ions to water to form hydronium ions is called _____.
Respuesta
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water
-
strong acid
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salt
-
weak acid
Pregunta 40
Pregunta
The radius of a gold atom is 144 picometer. Express this radius in centimeter.
Respuesta
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1.44 x 10 ^ -5 cm
-
1.44 x 10 ^ -6 cm
-
1.44 x 10 ^ -7 cm
-
1.44 x 10 ^ -8 cm
Pregunta 41
Pregunta
It is the property of matter that is independent of its surrounding condition and position.
Respuesta
-
weight
-
mass
-
density
-
volume
Pregunta 42
Pregunta
An example of a substance that cannot be further decomposed by ordinary chemical means is ______.
Respuesta
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air
-
water
-
salt
-
iron
Pregunta 43
Pregunta
A substance that can be further simplified may either be
Respuesta
-
a mixture or an atom
-
a mixture of a compound
-
an element or a mixture
-
an element or a compound
Pregunta 44
Pregunta
An example of chemical change is the
Respuesta
-
burning of wood
-
breaking of a glass bottle
-
melting of an ice cube
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sawing of a piece of wood
Pregunta 45
Pregunta
Chemical reaction may involve all of the following except
Respuesta
-
separation of the molecules in a mixture
-
breaking down of compounds into elements
-
combination of atoms of elements to form a molecule
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reaction of a compound and an element to form a new compound and a new element
Pregunta 46
Pregunta
Carbon - 14 has a half-life of approximately [blank_start]5600 years[blank_end]
Respuesta
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5600 years
-
5600 days
-
5000 years
-
600 years
Pregunta 47
Pregunta
Which of the following has 4 significant figures?
Respuesta
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1.68
-
168.0
-
0.0168
-
0.00168
Pregunta 48
Pregunta
An orbital can NEVER be occupied by
Respuesta
-
1 electron
-
2 electrons
-
3 electrons
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0 electron
Pregunta 49
Pregunta
A positively-charged ion has:
Respuesta
-
more protons than electrons
-
more electrons than protons
-
an equal number of neutrons and electrons
-
an equal number of protons and electrons
Pregunta 50
Pregunta
Sound is a form of energy produced by the vibration of matter. When an object produces sound, the vibration travels through space as
Respuesta
-
sound energy
-
molecules
-
sound wave
-
radio wave
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