Which of the following scientific instruments has the greatest resolving power? w) electron microscope x) light microscope y) phase-contrast microscope z) centrifuge

Which of the following scientific instruments has the greatest resolving power? w) electron microscope x) light microscope y) phase-contrast microscope z) centrifuge
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ANSWER: W -- ELECTRON MICROSCOPE
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If you wanted to study the surface of a bacterial cell, you would use a. A transmission electron microscope. b. A light microscope with phase-contrast optics. c. A scanning electron microscope. d. A light microscope with dark-field optics.

Description : If you wanted to study the surface of a bacterial cell, you would use a. A transmission electron microscope. b. A light microscope with phase-contrast optics. c. A scanning electron microscope. d. A light microscope with dark-field optics.

Last Answer : c. A scanning electron microscope.

If you wanted to study bacterial motility you would most likely use a. A transmission electron microscope. b. A tight microscope with dark-field optics. c. A scanning electron microscope. d. A light microscope with phase-contrast optics.

Description : If you wanted to study bacterial motility you would most likely use a. A transmission electron microscope. b. A tight microscope with dark-field optics. c. A scanning electron microscope. d. A light microscope with phase-contrast optics.

Last Answer : a. A transmission electron microscope.

A major breakthrough in the studies of cells came with the development of electron microscope. This is because (a) the electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons (b) the resolving power of the electron microscope is much higher than that of the light microscope (c) the resolving power of the electron microscope is 200 - 350 nm as compared to 0.1 - 0.2 nm for the light microscope (d) electron beam can pass through thick materials, whereas light microscopy requires thin sections.

Description : A major breakthrough in the studies of cells came with the development of electron microscope. This is because (a) the electron microscope is more powerful than the light microscope as it ... (d) electron beam can pass through thick materials, whereas light microscopy requires thin sections.

Last Answer : (b) the resolving power of the electron microscope is much higher than that of the light microscope

What type of microscope is usually necessary for observing viruses? A Dark field microscope B Phase contrast microscope C Electron microscope D Compoundmicroscope

Description : What type of microscope is usually necessary for observing viruses? A Dark field microscope B Phase contrast microscope C Electron microscope D Compoundmicroscope

Last Answer : C Electron microscope

________________ increases size of an object. (A) Magnification (B) Resolution (C) Resolving power (D) Contrast

Description : ________________ increases size of an object. (A) Magnification (B) Resolution (C) Resolving power (D) Contrast

Last Answer : (A) Magnification

What is a microscope's ability to distinguish between separate objects that are close together? (A) Magnification (B) Contrast (C) Resolving power (D) Scanning power

Description : What is a microscope's ability to distinguish between separate objects that are close together? (A) Magnification (B) Contrast (C) Resolving power (D) Scanning power

Last Answer : (C) Resolving power

A space ship traveling toward Mars at 0.6 times the speed of light c shoots an ELECTRON beam at Mars. If the electrons travel at 0.6 c RELATIVE TO THE SPACE SHIP, at what speed do the electrons impact the surface of Mars? w) 0.6 c x) 0.88 c y) 1.2 c z) 1.34 c

Description : A space ship traveling toward Mars at 0.6 times the speed of light c shoots an ELECTRON beam at Mars. If the electrons travel at 0.6 c RELATIVE TO THE SPACE SHIP, at what speed do the electrons impact the surface of Mars? w) 0.6 c x) 0.88 c y) 1.2 c z) 1.34 c

Last Answer : ANSWER: X -- 0.88 c

A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction. Is it: w) red x) yellow y) blue z) violet

Description : A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction. Is it: w) red x) yellow y) blue z) violet

Last Answer : ANSWER: W -- RED

Resolving power is the ability of a microscope to a. Estimate cell size. b. Magnify an image. c. See two close objects as separate. d. Keep objects in focus.

Description : Resolving power is the ability of a microscope to a. Estimate cell size. b. Magnify an image. c. See two close objects as separate. d. Keep objects in focus.

Last Answer : d. Keep objects in focus.

Which one of the following instruments is used to study dispersion of light? (1) Microscope (2) Telescope (3) Spectrometer (4) Photometer

Description : Which one of the following instruments is used to study dispersion of light? (1) Microscope (2) Telescope (3) Spectrometer (4) Photometer

Last Answer : (3) Spectrometer Explanation: Dispersion occurs when different frequencies of light have different phase velocities, due either to material properties (material dispersion) or to the geometry ... portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials.

Which one of the following instruments is used to study dispersion of light ? (1) Microscope (2) Telescope (3) Spectrometer (4) Photometer

Description : Which one of the following instruments is used to study dispersion of light ? (1) Microscope (2) Telescope (3) Spectrometer (4) Photometer

Last Answer : Spectrometer

Which of the following instruments should never have their test leads connected directly to a wall outlet: w) ammeter x) voltmeter y) oscilloscope z) frequency counter

Description : Which of the following instruments should never have their test leads connected directly to a wall outlet: w) ammeter x) voltmeter y) oscilloscope z) frequency counter

Last Answer : ANSWER: W -- AMMETER

Solids may be considered to be either crystalline noncrystalline. The basic difference between them is that a crystal, in contrast to a noncrystal: w) has a sharp melting point x) has an irregular array of atoms y) exhibits double refraction z) has a completely regular atomic or molecular structure

Description : Solids may be considered to be either crystalline noncrystalline. The basic difference between them is that a crystal, in contrast to a noncrystal: w) has a sharp melting point x) has an irregular array of atoms y) exhibits double refraction z) has a completely regular atomic or molecular structure

Last Answer : ANSWER: Z -- HAS A COMPLETELY REGULAR ATOMIC OR MOLECULAR STRUCTURE

An electron microscope gives higher magnification than an optical microscope, because: (1) It uses more powerful lenses (2) the velocity of electron is smaller than that of visible (3) the electrons have more energy than the light particles (4) the wavelength of electrons is smaller as compared to the wavelength of visible light

Description : An electron microscope gives higher magnification than an optical microscope, because: (1) It uses more powerful lenses (2) the velocity of electron is smaller than that of visible (3) the ... particles (4) the wavelength of electrons is smaller as compared to the wavelength of visible light

Last Answer : (4) the wavelength of electrons is smaller as compared to the wavelength of visible light Explanation: An electron microscope uses a beam of electrons to illuminate a specimen and produce a ... photons. Magnification is the process of enlarging something only in appearance, not in physical size.

An electron microscope gives higher magnifications than an optical microscope because – (1) The velocity of electrons is smaller than that of light (2) The wavelength of electrons is smaller as compared to the wavelength of visible light (3) The electrons have more energy than the light particulars (4) The electron microscope uses more powerful lenses

Description : An electron microscope gives higher magnifications than an optical microscope because - (1) The velocity of electrons is smaller than that of light (2) The wavelength of electrons is smaller as ... have more energy than the light particulars (4) The electron microscope uses more powerful lenses

Last Answer : (2) The wavelength of electrons is smaller as compared to the wavelength of visible light Explanation: An electron microscope is a microscope that uses a beam of accelerated electrons as a spume ... a higher resolving power than a light microscope and can reveal the structure of smaller objects.

An electron microscope gives higher magnifications than an optical microscope because : (1) The velocity of electrons is smaller than that of light (2) The wavelength of electrons is smaller as compared to the wavelength of visible light (3) The electrons have more energy than the light particulars (4) The electron microscope uses more powerful lenses

Description : An electron microscope gives higher magnifications than an optical microscope because : (1) The velocity of electrons is smaller than that of light (2) The wavelength of electrons is smaller as ... have more energy than the light particulars (4) The electron microscope uses more powerful lenses 

Last Answer : The wavelength of electrons is smaller as compared to the wavelength of visible light

An electron microscope gives higher magnification than an optical microscope, because : (1) it uses more powerful lenses (2) the velocity of electron is smaller than that of visible light (3) the electrons have more energy than the light particles (4) the wavelength of electrons is smaller as compared to the wavelength of visible light

Description : An electron microscope gives higher magnification than an optical microscope, because : (1) it uses more powerful lenses (2) the velocity of electron is smaller than that of visible light (3) ... particles (4) the wavelength of electrons is smaller as compared to the wavelength of visible light

Last Answer : the wavelength of electrons is smaller as compared to the wavelength of visible light

The physicist Chadwick is known for his association with: w) the alpha particle x) the neutron y) the cloud chamber z) the electron

Description : The physicist Chadwick is known for his association with: w) the alpha particle x) the neutron y) the cloud chamber z) the electron

Last Answer : ANSWER: X -- THE NEUTRON

A wavelength is commonly measured in which one of the following units? w) radians x) angstroms y) electron volts z) seconds

Description : A wavelength is commonly measured in which one of the following units? w) radians x) angstroms y) electron volts z) seconds

Last Answer : ANSWER: X -- ANGSTROMS

When radiation breaks an electron pair bond in a molecule and each fragment of the molecule gets one of the bond electrons, the molecular fragments that are formed are called: w) ions x) free radicals y) stable molecules z) gases

Description : When radiation breaks an electron pair bond in a molecule and each fragment of the molecule gets one of the bond electrons, the molecular fragments that are formed are called: w) ions x) free radicals y) stable molecules z) gases

Last Answer : ANSWER: X -- FREE RADICALS

Which of the following units of energy is the smallest: w) calorie x) Joule y) erg z) electron-volt

Description : Which of the following units of energy is the smallest: w) calorie x) Joule y) erg z) electron-volt

Last Answer : ANSWER: Z -- ELECTRON-VOLT 

An ELECTRON moving horizontally along the +x axis enters a region of space with a horizontal uniform magnetic field pointing in the +y direction. The electron will be deflected: w) -y direction x) +y direction y) -z direction z) +z direction

Description : An ELECTRON moving horizontally along the +x axis enters a region of space with a horizontal uniform magnetic field pointing in the +y direction. The electron will be deflected: w) -y direction x) +y direction y) -z direction z) +z direction

Last Answer : ANSWER: Y -- -Z DIRECTION

An electron is classified as a: w) boson x) nucleon y) fermion z) meson

Description : An electron is classified as a: w) boson x) nucleon y) fermion z) meson

Last Answer : ANSWER: Y -- FERMION

A characteristic of the noble gases is that they all: w) have eight electrons in the outer shell x) have low stability y) form many compounds z) have filled outer electron shells

Description : A characteristic of the noble gases is that they all: w) have eight electrons in the outer shell x) have low stability y) form many compounds z) have filled outer electron shells

Last Answer : ANSWER: Z -- HAVE FILLED OUTER ELECTRON SHELLS

In Rutherford's experiment involving the deflection of alpha particles by atomic nuclei, the fact that some of the alpha particles bombarding the thin gold foil were back-scattered, led to one of the following conclusions. It was concluded that: w) the charge of an electron is negative x) the nucleus of a gold atom carries all its charge y) most of the mass of a gold atom is in its nucleus z) the nucleus of a gold atom occupies nearly the entire space of the atom

Description : In Rutherford's experiment involving the deflection of alpha particles by atomic nuclei, the fact that some of the alpha particles bombarding the thin gold foil were back-scattered, led to one of the ... its nucleus z) the nucleus of a gold atom occupies nearly the entire space of the atom

Last Answer : ANSWER: Y -- MOST OF THE MASS OF A GOLD ATOM IS IN ITS NUCLEUS

An electron and a proton are moving at the same speed in circular paths in the same uniform magnetic field. The radius of the path of the proton is one of the following. Is this radius: w) the same as that of the electron x) about 2000 times larger than that of the electron y) a little larger than that of the electron z) smaller than that of the electron

Description : An electron and a proton are moving at the same speed in circular paths in the same uniform magnetic field. The radius of the path of the proton is one of the following. Is this radius: w) the same ... of the electron y) a little larger than that of the electron z) smaller than that of the electron

Last Answer : ANSWER: X -- ABOUT 2000 TIMES LARGER THAN THAT OF THE ELECTRON

In changing from an energy state of -1.51 electron-volts to -3.40 electron-volts, an atom emits a photon whose energy is: w) 1.51 electron-volts x) 1.89 electron-volts y) 3.40 electron-volts z) 4.91 electron-volts

Description : In changing from an energy state of -1.51 electron-volts to -3.40 electron-volts, an atom emits a photon whose energy is: w) 1.51 electron-volts x) 1.89 electron-volts y) 3.40 electron-volts z) 4.91 electron-volts

Last Answer : ANSWER: X -- 1.89 ELECTRON-VOLTS

For the hydrogen atom, which series describes electron transitions to the N = 2 orbit? Is it the: w) Lyman series x) Paschen series y) Balmer series z) Pfund series

Description : For the hydrogen atom, which series describes electron transitions to the N = 2 orbit? Is it the: w) Lyman series x) Paschen series y) Balmer series z) Pfund series

Last Answer : ANSWER: Y -- BALMER SERIES

The rest mass of an electron is closest to: w) 10-15 kilograms x) 10-17 kilograms y) 10-30 kilograms z) 10-50 kilograms

Description : The rest mass of an electron is closest to: w) 10-15 kilograms x) 10-17 kilograms y) 10-30 kilograms z) 10-50 kilograms

Last Answer : ANSWER: Y -- 10-30 KILOGRAMS (accept 9.11 x 10-31kg) 

Of the following choices, approximately how many times greater is the mass of a proton than the mass of an electron? w) 200 x) 2000 y) 20,000 z) 200,000

Description : Of the following choices, approximately how many times greater is the mass of a proton than the mass of an electron? w) 200 x) 2000 y) 20,000 z) 200,000 

Last Answer : ANSWER: X -- 2000

The anti-particle to an electron is: w) proton x) positron y) neutron z) anti-proton

Description : The anti-particle to an electron is: w) proton x) positron y) neutron z) anti-proton

Last Answer : ANSWER: X -- POSITRON

In the Compton effect, a photon of wavelength l (read: lambdw) collides with a stationary electron. The wavelength of the emitted photon is: w) longer than l x) shorter than l y) the same as l z) no photon is emitted

Description : In the Compton effect, a photon of wavelength l (read: lambdw) collides with a stationary electron. The wavelength of the emitted photon is: w) longer than l x) shorter than l y) the same as l z) no photon is emitted

Last Answer : ANSWER: W -- LONGER THAN l

An alpha particle colliding with an electron loses: w) none of its energy x) little of its energy y) half of its energy z) all of its energy

Description : An alpha particle colliding with an electron loses: w) none of its energy x) little of its energy y) half of its energy z) all of its energy

Last Answer : ANSWER: X -- LITTLE OF ITS ENERGY

In radioactive decay, the emission of an electron is characteristic of: w) Alpha decay x) Beta decay y) Gamma decay z) X-rays

Description : In radioactive decay, the emission of an electron is characteristic of: w) Alpha decay x) Beta decay y) Gamma decay z) X-rays

Last Answer : ANSWER: X -- BETA DECAY

When an atomic nucleus emits a beta particle, one of its neutrons disintegrates into one of the following set of particles. Does it disintegrate into: w) a positron and an electron x) a proton, an electron, and an antineutrino y) a proton, an electron, and a positron z) a neutrino and an antineutrino

Description : When an atomic nucleus emits a beta particle, one of its neutrons disintegrates into one of the following set of particles. Does it disintegrate into: w) a positron and an electron x) a proton, an ... and an antineutrino y) a proton, an electron, and a positron z) a neutrino and an antineutrino

Last Answer : ANSWER: X -- A PROTON, AN ELECTRON AND AN ANTINEUTRINO 

An x-ray photon collides with a free electron, and the photon is scattered. During this collision there is conservation of: w) momentum but not energy x) neither momentum nor energy y) energy but not momentum z) both momentum and energy

Description : An x-ray photon collides with a free electron, and the photon is scattered. During this collision there is conservation of: w) momentum but not energy x) neither momentum nor energy y) energy but not momentum z) both momentum and energy

Last Answer : ANSWER: Z -- BOTH MOMENTUM AND ENERGY 

The collision between a photon and a free electron was first explained by which of the following scientists? w) Einstein x) Heisenberg y) Compton z) Bohr

Description : The collision between a photon and a free electron was first explained by which of the following scientists? w) Einstein x) Heisenberg y) Compton z) Bohr

Last Answer : ANSWER: Y -- COMPTON

For the hydrogen atom, which series describes electron transitions to the N=1 orbit, the lowest energy electron orbit? Is it the: w) Lyman series x) Balmer series y) Paschen series z) Pfund series

Description : For the hydrogen atom, which series describes electron transitions to the N=1 orbit, the lowest energy electron orbit? Is it the: w) Lyman series x) Balmer series y) Paschen series z) Pfund series

Last Answer : ANSWER: W -- LYMAN SERIES

The streak of a mineral can be obtained most easil by performing which of the following tests? w) rubbing the mineral on an unglazed white tile x) putting the mineral into acid y) scratching the mineral with a diamond z) examining the mineral under a microscope

Description : The streak of a mineral can be obtained most easil by performing which of the following tests? w) rubbing the mineral on an unglazed white tile x) putting the mineral into acid y) scratching the mineral with a diamond z) examining the mineral under a microscope

Last Answer : ANSWER: W -- RUBBING THE MINERAL ON AN UNGLAZED WHITE TILE

The non-relativistic mass of an object w) must be the same as its weight x) depends on where you measure it y) does not change with increasing velocity z) is greatest at the poles

Description : The non-relativistic mass of an object w) must be the same as its weight x) depends on where you measure it y) does not change with increasing velocity z) is greatest at the poles

Last Answer : ANSWER: Y -- DOES NOT CHANGE WITH INCREASING VELOCITY

Which of the following quantities has the GREATEST influence on the overall efficiency of a conventional (Rankine cycle) electric generating station burning fossil fuels? w) steam temperature at the steam turbine inlet x) net heating value of the fuel y) steam pressure at the steam turbine inlet z) pounds of ash and sulfur per pound of fuel

Description : Which of the following quantities has the GREATEST influence on the overall efficiency of a conventional (Rankine cycle) electric generating station burning fossil fuels? w) steam temperature at the steam turbine ... pressure at the steam turbine inlet z) pounds of ash and sulfur per pound of fuel 

Last Answer : ANSWER: W -- STEAM TEMPERATURE AT THE STEAM TURBINE INLET 

Which of the following implies the greatest precision? w) 1.02 x 105 x) 102 x 103 y) 0.102 x 106 z) 1.020 x 105

Description : Which of the following implies the greatest precision? w) 1.02 x 105 x) 102 x 103 y) 0.102 x 106 z) 1.020 x 105

Last Answer : ANSWER: Z -- 1.020 x 105

In simple harmonic motion, the acceleration is: w) constant x) proportional to the distance from the central position y) greatest when the velocity is greatest z) none of the above

Description : In simple harmonic motion, the acceleration is: w) constant x) proportional to the distance from the central position y) greatest when the velocity is greatest z) none of the above

Last Answer : ANSWER: X -- PROPORTIONAL TO THE DISTANCE FROM THE CENTRAL POSITION

Which of the following statements dealing with simple harmonic motion of a mass-spring system is TRUE? w) The acceleration is largest when the oscillating mass is instantaneously at rest. x) The larger the spring force constant the larger the period. y) The period of the motion depends linearly on the amplitude of the motion. z) The acceleration is larger when the oscillating mass has its greatest velocity.

Description : Which of the following statements dealing with simple harmonic motion of a mass-spring system is TRUE? w) The acceleration is largest when the oscillating mass is instantaneously at rest. x) The ... of the motion. z) The acceleration is larger when the oscillating mass has its greatest velocity.

Last Answer : ANSWER: W -- THE ACCELERATION IS LARGEST WHEN THE OSCILLATING MASS IS INSTANTANEOUSLY AT REST 

The greatest induced EMF will occur in a straight wire moving at constant speed through a uniform magnetic field when the angle between the direction of the wire's motion and the direction of the magnetic field is w) 0 degrees x) 30 degrees y) 60 degrees z) 90 degrees

Description : The greatest induced EMF will occur in a straight wire moving at constant speed through a uniform magnetic field when the angle between the direction of the wire's motion and the direction of the magnetic field is w) 0 degrees x) 30 degrees y) 60 degrees z) 90 degrees

Last Answer : ANSWER: Z -- 90 DEGREES

What does the letter "s" stand for in the acronym laser? w) scientific x) simulated y) stimulated z) solar

Description : What does the letter "s" stand for in the acronym laser? w) scientific x) simulated y) stimulated z) solar

Last Answer : ANSWER: Y -- STIMULATED (LIGHT AMPLIFICATION BY STIMULATED MISSI)

Electron microscope has a high resolution power. This is due to (a) electromagnetic lenses (b) very low wavelength of electron beam (c) low wavelength of light source used (d) high numerical aperture of glass lenses used.

Description : Electron microscope has a high resolution power. This is due to (a) electromagnetic lenses (b) very low wavelength of electron beam (c) low wavelength of light source used (d) high numerical aperture of glass lenses used.

Last Answer : (b) very low wavelength of electron beam

Nucleotide arrangement in DNA can be seen by (a) X-ray crystallography (b) electron microscope (c) ultracentrifuge (d) light microscope

Description : Nucleotide arrangement in DNA can be seen by (a) X-ray crystallography (b) electron microscope (c) ultracentrifuge (d) light microscope

Last Answer : (a) X-ray crystallography

As of December, 1990, which of the following countries generated the greatest percentage of its electricity by nuclear power? w) England x) Japan y) United States z) France

Description : As of December, 1990, which of the following countries generated the greatest percentage of its electricity by nuclear power? w) England x) Japan y) United States z) France

Last Answer : ANSWER: Z -- FRANCE

Standing waves are formed when two sets of waves of equal amplitude and frequency w) are in phase x) are in opposite phase y) move through each other in opposite directions z) are reflected from the same surface

Description : Standing waves are formed when two sets of waves of equal amplitude and frequency w) are in phase x) are in opposite phase y) move through each other in opposite directions z) are reflected from the same surface

Last Answer : ANSWER: Y -- MOVE THROUGH EACH OTHER IN OPPOSITE DIRECTIONS