If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
In a controlled thermal fission reactor, the use of control rods will not affect the
energy generated in the nuclear reactor
rate of production of the neutrons.
speed of the neutrons released on fission.
amount of radiation produced in the nuclear reactor.
Correct answer is C
In a controlled thermal fission reactor, control rods are used to absorb excess neutrons and thus control the rate of the nuclear reaction. They do not affect the speed of the neutrons released on fission. The speed of the neutrons is determined by the nature of the fission process itself, not by the control rods.
The process of producing electric current by a changing magnetic field is referred to as
magnet induction
electromagnetic induction
flux linkage
electrostatic induction
Correct answer is B
The process of producing electric current by a changing magnetic field is referred to as electromagnetic induction.
Electromagnetic induction is a phenomenon in which a voltage is generated in a conductor when it is exposed to a changing magnetic field. This voltage can then be used to drive an electric current.
( The diagrams above are meant to help you in answering this question)
A
B
C
D
Correct answer is B
The diagram above is a full wavelength and the length of an open pipe during first overtone equals one wavelength i.e. l = λ
The electric field in the region outside the parallel plate is zero, except for the edge effects
The magnitude of the electric field strength at any point between the plates, except near the edges, depends on the magnitude of the charge on each plate.
The magnitude of the electric field strength at any point between the plates is directly proportional to the magnitude of the charge on each plate.
The electric field is uniform everywhere in the space between the parallel plates
Correct answer is C
The magnitude of the electric field strength at any point between the plates is not directly proportional to the magnitude of the charge on each plate. Instead, it is directly proportional to the charge density (charge per unit area) on the plates. Therefore, if the charge on the plates is increased while keeping the area of the plates constant, the electric field strength will increase. However, if the area of the plates is also increased such that the charge density remains constant, the electric field strength will not change
The shape of the instrument
The tension of the string
The size of the instrument
The material of the instrument
Correct answer is B
The frequency of a sound wave is proportional to the tension of the string. If two instruments have the same frequency, but one has a tighter string, then the instrument with the tighter string will have a higher pitch.
The other factors listed, such as the size of the instrument, the material of the instrument, and the shape of the instrument, will also affect the pitch of the instrument, but they will have a smaller effect than the tension of the string.
In an AC circuit, resonance occurs when the impedance of the circuit is:
Zero
Maximum
Equal to the capacitive reactance of the circuit
Minimum
Correct answer is D
Resonance in an AC circuit occurs when the inductive reactance (XL) is equal to the capacitive reactance (XC). This is because at this point, the two reactances cancel each other out, leaving only the resistance of the circuit. As a result, the impedance of the circuit is minimized.
Which of the following is a type of wave that is both mechanical and longitudinal?
Water waves
Seismic waves
Sound waves
Light waves
Correct answer is C
Sound waves are mechanical waves that are longitudinal. This means that the particles of the medium through which sound waves travel, such as air or water, move back and forth in the same direction as the wave travels.
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