PHYSCI Reviewer Flashcards
where are carbon nitrogen and oxygen generally formed
a. red giant star
b. supernova
c. white dwarf
d. black hole
b. supernova
what is missing in this reaction 12/6C + 12/6C –> _ + Y
a. carbon
b. neon
c. magnesium
d. iron
c. magnesium
what type of nuclear reaction does this equation show?
67/31Ga + 0/-1 —> 67/30Zn
a. beta emission
b. electron capture
c. gamma emission
d. neutron capture
b. electron capture
complete the nuclear reaction 244/96 + 4/2He —> 1/2H + 2 1/0H
a. 246/98Cf
b. 245/97Bk
c. 238/92U
d. 244/96Cm
a. 246/98Cf
which of the following molecular shape is a polar molecule?
a. linear
b. bent
c. tetrahedral
d. triagonal pyramidal
b. bent
water and oil will now mix because water is _ and oil is _
a. polar: non polar
b. non polar: polar
c. polar: polar
d. non polar: non polar
a. polar: non polar
which of the following compounds does not exhibit dipole-dipole forces?
a. 3HCI
b. SO2
c. HF
d. H2O
a. 3HCI
which of the following does not form hydrogen bonds?
a. H2S
b. NH3
c. HF
d. H2O
a. H2S
which of the following is not a type of intermolecular forces?
a. covalent bond
b. dipole dipole
c. hydrogen bond
d. london dispersion
a. covalent bond
which of the following is a type of intermolecular forces present in all molecules
a. covalent bond
b. dipole dipole
c. hydrogen bond
d. london dispersion
d. london dispersion
substances like heavy syrup and molasses flow slower than water. the ability of these substances to resist flow is known as
a. viscosity
b. pressure
c. surface tension
d. capillary action
a. viscosity
liquids can form spherical elastic film to minimize surface area. what intermolecular force is responsible for the formation of this film in water?
a. h bonding
b. ion induced dipole
c. dipole induced dipole
d. london dispersion force
a. h bonding
which group of biomolecules carries and passes on the hereditary information of the organism?
a. carbohydrates
b. lipids
c. nucleic acids
d. proteins
c. nucleic acids
which of the following is not a lipid
a. hemoglobin
b. fat
c. steroid
d. triglycerides
a. hemoglobin
which organic molecule is soluble in water and serves as a quick source of energy?
a. carbohydrates
b. lipids
c. nucleic acids
d. proteins
a. carbohydrates
which of the following is considered as the building block of proteins?
a. amino acids
b. nucleic acids
c. nucleotides
d. polypeptides
a. amino acids
which of the following factors will slow down the rate of chemical reaction?
a. manual stirring of the substance
b. placing catalyst in iced water
c. placing substance in a hot water
d. placing reactants in ice bath
d. placing reactants in ice bath
which of the following factor does not show evidence of chemical reaction?
a. absorption heat
b. change of size
c. change of color
d. liberation of heat
b. change of size
a substance that increases the rate of a reaction without being used up during the reaction is called a
a. catalyst
b. reactant
c. product
d. solute
a. catalyst
which of the following will lower the rate of reaction?
a. adding an enzyme to the reaction
b. decreasing the temperature from 40’C
c. increasing the amount of solute dissolved in solution
d. breaking a chunk of calcium up into smaller pieces
b. decreasing the temperature from 40’C
which of the following describes relationship of the number of moles and mass or reactant and products in a chemical reaction?
a. molality
b. chemical symbols
c. chemical reaction
d. stoichiometry
d. stoichiometry
h is the process that involves rearrangement of the molecular or ionic structure of a substance to for ma new substance or product
a. chemical equilibrium
b. chemical symbols
c. chemical reaction
d. stoichiometry
c. chemical reaction
which of the following equation below is balanced?
a. AI + 3O2 -> 2AI203
b. 4AI + 3O2 -> AI203
c. 4AI + O2 -> 2AI203
d. 4AI + 3O2 -> 2AI203
c. 4AI + O2 -> 2AI203
in the equation Mg + HCI -> MGCI2 + H2, how many molecules of hydrogen do we need to make hydrogen balanced?
a. 3
b. 6
c. 2
d. 7
c. 2
this is the kind of renewable energy that is used to create methane and alcohol which are fuels useful in energy production and in powering automobiles
a. biomass
b. geothermal
c. hydroelectric
d. solar wind
a. biomass
there are installed in strategic location to harness the mechanical energy from wind
a. dams
b. power plants
c. wind turbines
d. windmills
c. wind turbines
this renewable energy utilizes moving water to turn turbines
a. biomass
b. geothermal
c. hydroelectric
d. solar wind
c. hydroelectric
around how many percent of electricity in visayas is produced from geothermal power?
a. 14%
b. 38%
c. 29%
d. 45%
b. 38%
this can prevent the spread of infectious diseases and control allergens, such as dust and mold
a. cleaning product
b. cooking utensils
c. electrical appliances
d. vehicles
a. cleaning product
this is a reducing bleach that works by changing the double bonds of chromosphere into single bonds
a. increasing bleach
b. oxidizing bleach
c. non oxidizing bleach
d. reducing bleach
d. reducing bleach
what substance when added to a cleaning product makes it stable and safe for a longer period?
a. enzymes
b. foam enhancer
c. pH adjuster
d. preservative
d. preservative
which of the following ingredients is considered as the active substance in a cleaning product?
a. enzymes
b. solvents
c. surfactants
d. thickener
a. enzymes
which of the following is the shape of the earth according to ancient greeks
a. cylinder
b. octagon
c. flat disc
d. sphere
d. sphere
which of the following correctly paired the astronomer and his contribution?
a. pythagoras - earth’s circumference
b. johannes kepler - craters of the moon
c. nicolaus copernicus - heliocentric universe
d. eudoxus - geocentric theory
c. nicolaus copernicus - heliocentric universe
the great contribution of tycho brahe was to
a. offer the first detailed of a sun centered solar system, thereby beginning the process of overturning the earth centered model of the greeks
b. observe planetary positions with sufficient accuracy so that kepler could later use the data to discover the laws of planetary motion
c. discover four moons orbiting jupiter, thereby lending strong support to the idea that the earth is not the center of the universe
d. discover that planets orbit the sun in elliptical orbits with varying speed
b. observe planetary positions with sufficient accuracy so that kepler could later use the data to discover the laws of planetary motion
the following are the laws formulated by kepler using brahe’s data and observations except
a. law of ellipses
b. law of equal areas
c. law of harmonies
d. law of period
c. law of harmonies
he hypothesized that the wave like behavior of electrons seen in light can also be present in matter
a. isaac newton
b. thomas young
c. louis de broglie
d. christian huygens
c. louis de broglie
what does the dark fringe patterns of light wave on the screen in double slit experiment show?
a. destructive interference
b. reflected interference
c. constructive interference
d. diffracted interference
a. destructive interference
why is the spectrum of light separated into its components of color when white light is directed to a prism
a. the different colors in the white light bend away from the normal line at different angles when entering prism ingestion
b. the different colors in the white light bend towards the normal line at different angles when entering prism
c. the different colors in the white light bend away from the normal at same speed to each other when entering prism
d. the different colors in the white light bend towards the normal at same speed to each other when entering prism
a. the different colors in the white light bend away from the normal line at different angles when entering prism ingestion
what phenomenon occurs when colors of a rainbow are seen when light passes through a glass prism
a. scattering
b. diffraction
c. dispersion
d. reflection
c. dispersion
rain clouds are mostly gray because
a. it mostly absorbs all colors
b. it reflects less light as it prepares to rain
c. it reflects lighter due to large water molecules
d. it does not scatter light and focuses it on the atmosphere
a. it mostly absorbs all colors
what principle is responsible when we see yellow to red skies in the early morning or late afternoon
a. diffraction
b. dispersion
c. inference
d. scattering
d. scattering
based on the electromagnetic spectrum, which of the following do radio waves have
a. high frequency and long wavelength
b. high frequency and short wavelength
c. low frequency and long wavelength
d. low frequency and short wavelength
c. low frequency and long wavelength
how are radio waves generated and detected
a. by a battery and detected by a microscope
b. by a microphone and detected by Z104
c. by light cannot be detected
d. by transmitters and detected by receivers using antennas
d. by transmitters and detected by receivers using antennas
which of the following is true according to the special relativity
a. physical laws are the same in frames of reference which accelerate
b. physical laws are the same in frames of reference which move at uniform velocity
c. physical laws are the same in frames of reference which move in circles
d. physical laws are the same in frames of reference which move in ellipses
b. physical laws are the same in frames of reference which move at uniform velocity
which is true about newton’s first law of motion
a. a moving object that is not acted on by an unbalanced force will accelerate
b. a moving object that is not acted an by an unbalanced force will change its momentum
c. a moving object that is not acted on by an unbalanced force will eventually come to a stop
d. a moving object that is not acted on by an unbalanced force will remain in motion
d. a moving object that is not acted on by an unbalanced force will remain in motion
why is the speed of light can never be attained
a. fuels will not burn at this speed
b. it would take an infinite amount of energy
c. no amount of material can handle this speed
d. none of the above
b. it would take an infinite amount of energy
if a spaceship hypothetically reached the speed of light, what would happen to time on that travelling ship?
a. greater than normal time
b. equal to normal time
c. lesser than normal time
d. not moving
c. lesser than normal time
jimmy and timmy are twins, and both have the same height. jimmy was sent to a space mission to circumnavigate the solar system for 10 years, flying at a constant speed. after the mission, what difference can be observed with the twins
a. jimmy will look younger
b. timmy will look younger
c. jimmy will be taller
d. timmy will be talle
a. jimmy will look younger
according also to the theory of general relativity, which of the following best explains the sudden curve of light that travels in straight path?
a. something blocks on its ways
b. the source of light is coming from a stationary object
c. a strong gravitational force exerted
d. when coming from a moving object
c. a strong gravitational force exerted
