A thousand ways to pass basic physics examination

181.X- rays cannot be used
  • A. to take photographs of bone structure in the body
  • B. to detect finger prints
  • C. to detect flaws in metal castings
  • D. to detect alterations to works of art
182.1 farad is equivalent to:
  • A. 1 coulomb/volt
  • B. 1 volt/coulomb
  • C. 1 joules/coulomb
  • D. 1 ampere/sec
183.A 0 - 10mA galvanometer with a coil resistance of 30 ohm can be converted to a 0-10A ammeter by using
  • A. 0.03ohm series resistor
  • B. 9.99ohm shunt resistor
  • C. 0.03ohm shunt resistor
  • D. 9.99ohm series resistor
184.A battery has an internal resistance of 4 and an emf of 12V. The terminal voltage when a load of 20 Ω is connected across it is:
  • A. 4 V
  • B. 10 V
  • C. 20 V
  • D. 2 V
185.A magnet cannot be demagnetized by
  • A. heating
  • B. hammering
  • C. chemical treatment
  • D. the use of solenoid through which an alternating current is flowing
186.An a.c voltage is connected to an RLC series circuit of resistance 5 Ω, inductance 3 mH and a capacitance of 0.05 µF. Calculate the resonance frequency.
  • A. 11.0 kHz
  • B. 12.0 kHz
  • C. 13.0 kHz
  • D. 14.0 kHz
187.An electric heater converts 1KJ of electrical energy to heat energy every 2 second with 100% efficiency. The power produced is
  • A. 0.5 KW
  • B. 2 KW
  • C. 1KW
  • D. 10W
188.Complete the following statement: The electromotive force is
  • A. the maximum potential difference between the terminals of a battery
  • B. the force that accelerates electrons through a wire when a battery is connected to it
  • C. the force that accelerates protons through a wire when a battery is connected to it
  • D. the maximum capacitance between the terminals of a battery
189.If a charged body is moving in a circle on a horizontal plane, what is the general direction of the resulting magnetic field?
  • A. In the plane of the circle
  • B. At an angle 45o to the plane of motion
  • C. Along the perpendicular axis through the center of the circle
  • D. Along the tangent to the circle
190.If a resistor is halved in magnitude and the potential across it is tripled, then the ratio of the old current to the new current is
  • A. 1:3
  • B. 3:1
  • C. 6:1
  • D. 1:6
191.The angle between the earth’s magnetic field and the horizontal is called angle of
  • A. declination
  • B. dip
  • C. variation
  • D. inclination
192.The basic difference between the galvanometer and the electric motor is
  • A. The size of the magnetic fields
  • B. The presence of hair springs in the galvanometer
  • C. The soft iron armature in the galvanometer
  • D. The couple formed on the parallel sides of the rectangular coil in the galvanometer
193.The electromotive force is in such a direction as to oppose the motion or charge producing it. This is a statement of
  • A. Faraday’s Law
  • B. Lenz Law
  • C. Maxwell Law
  • D. Ampere’s law
194.The potential difference across the ends of a wire is doubled in magnitude. If Ohm’s law is obeyed, one of the following statements concerning the resistance of the wire is true?
  • A. The resistance is one half of its original value
  • B. The resistance is twice its original value
  • C. The resistance is not changed
  • D. The resistance increases by a factor of four
195.The process of adding impurity to a semiconductor to increase its conductivity is called
  • A. Doping
  • B. Annealing
  • C. Heating
  • D. Hardening
196.Which if the following combinations consists of intrinsic properties of materials
  • A. volume and density
  • B. density and mass
  • C. resistance and resistivity
  • D. density and resistivity
197.Which of the following can be measured with a potentiometer:
  • A. Emf of a secondary cell
  • B. Resistivity of a wire
  • C. Potential difference across a conductor
  • D. Resistance of a wire
198.Which of the following devices is odd in the list ?
  • A. thermocouple
  • B. potentiometer
  • C. d.c. generator
  • D. solar cell
199.Which of the following is an essential physical property of the wires used for making fuses?
  • A. high thermal conductivity
  • B. low density
  • C. low melting point
  • D. low electrical resistivity
200.Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true?
  • A. It is a maximum if the particle is stationary
  • B. It is a maximum if the particle moves parallel to the field
  • C. It acts in the direction of motion for a positively charged particle
  • D. It depends on the component of the particle's velocity that is perpendicular to the field