The first reflecting telescope was built by: w) Galileo x) Copernicus y) Tycho Brahe z) Isaac Newton. ANSWER: Z -- ISAAC NEWTON. Ten Coulombs of charge flowing through a wire per second is equal to: w) 100 Amperes x) 10 Ampere y) 1 Amperes z) 0.1 Amperes.ANSWER: X -- 10 AMPERES
What process produces most of the energy that is radiated by the Sun? w) gravitational contraction x) chemical combustion y) nuclear fusion z) nuclear fission ANSWER: Y -- NUCLEAR FUSION. What is the hydrostatic pressure at the bottom of a pool 6 meters deep? w) 60,000 Newtons per meter squared x) 6,000 Newtons per meter squared y) 600
In an ideal case, if a point source of light is placed at the focal point in front of a concave reflector, where will the image form? ANSWER: WILL NOT FORM or FORMS AT INFINITY. A 10 kg mass initially sitting on the ground is placed on a ledge 3 meters above ground level. What is the increase in potential energy of the mass? ANSWER: 294 JOULES.
The coating on the plastic tape you use in your cassette players is w) diamagnetic x) paramagnetic y) ferromagnetic z) a permanent magnet. ANSWER: Y -- FERROMAGNETIC. Your Minolta camera has a 50 millimeter lens. The 50 millimeters is the lens' w) diameter x) focal length y) magnification z) aperture ANSWER: X -- FOCAL LENGTH
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.
Light bends around sharp corners as a result of w) refraction x) reflection y) diffraction z) dispersion. ANSWER: Y -- DIFFRACTION; A light ray traveling from glass into air strikes the glass-air surface at an angle 50 degrees to the normal. If the critical angle for the glass-air combination is 42 degrees.
t a point halfway between two identical point charges, the electric field is equal to: w) zero x) half its maximum value y) its maximum value z) pointing away from the two charges. ANSWER: W -- ZERO. 2. A charged particle is moving in a UNIFORM magnetic field. If the direction of motion of the charged particle is at right angles to the magnetic field
Isotopes of an element have different numbers of: w) electrons x) protons y) neutrons z) leptons , ANSWER: Y -- NEUTRONS. Which one of the following particles travels at the speed of light? w) neutrons x) electrons y) photons z) muons. ANSWER: Y -- PHOTONS
According to standard convention, the angles of incidence and reflection for a plane surface are measured from: w) the reflecting surface x) lines at 45 degrees to the reflecting surface y) a line at 90 degrees to the reflecting surface z) there is no standard. ANSWER: Y -- A LINE AT 90 DEGREES TO THE REFLECTING SURFACE
A hollow METALLIC sphere has an inner radius A and an outer radius B. If charge is placed on the inner surface, that is at radius A, where is the charge located after it has come to rest? ANSWER: ON THE SPHERE'S OUTER SURFACE or OUTSIDE RADIUS B
Which of the following sets of 3 forces CANNOT have a vector sum of zero? w) 10, 10 and 10 Newtons x) 10, 10 and 20 Newtons y) 10, 20 and 20 Newtons z) 10, 20 and 40 Newtons; ANSWER: Z -- 10, 20 AND 40 NEWTONS. 2 A small cluster of stars appear, after many decades of observation, to be converging toward a common point in the sky.
According to the kinetic theory, the Kelvin temperature of an ideal gas is proportional to which one of the following. Is the temperature proportional to the gas's average molecular: w) velocity x) momentum y) kinetic energy z) potential energy ;ANSWER: Y -- KINETIC ENERGY PHYS-91
A car is moving along a straight horizontal road at a speed of 20 meters per second. The brakes are applied and a constant force of 5000 Newtons decelerates the car to a stop in 10 seconds. The mass of the car is: w) 1250 kilograms x) 2500 kilograms y) 5000 kilograms z) 10,000 kilograms; ANSWER: X -- 2500 KILOGRAMS
A 10 kilogram mass rests on a horizontal frictionless surface. A horizontal force of 5 Newtons is applied to the mass. After the force has been applied for 1 second, the velocity of the mass is: w) 0 meters per second x) 0.5 meters per second y) 5 meters per second z) 50 meters per second. ANSWER: X -- 0.5 METERS PER SECOND
PHYS-91; Multiple Choice: For a negative point charge, the electric field vectors: w) circle the charge x) point radially in toward the charge y) point radially away from the charge z) cross at infinity; ANSWER: X -- POINT RADIALLY IN TOWARD THE CHARGE; PHYS-91; Multiple Choice: For an infinite sheet of positive charge, the electric field lines
PHYS-91; Multiple Choice: 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, ANSWER: W -- LYMAN SERIES. PHYS-91; Multiple Choice: Electric current may be expressed in which one of the following units?