Reciprocal of resistivity is called__________________?
Reciprocal of resistivity is called__________________?
A. resistance
B. inductance
C. conductivity
D. flexibility
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Which one of the following properties of light does not change with the nature of the medium ?
Which one of the following properties of light does not change with the nature of the medium ?A. velocity
B. wavelength
C. amplitude
D. frequencyThe centripetal acceleration produced in a rotating body is commonly due to change on_________of body?
The centripetal acceleration produced in a rotating body is commonly due to change on_________of body?A. magnitude
B. directionÂ
C. both
D. None of theseA particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?
A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?A. independent mass m
B. directly proportional to m
C. directly proportional to q
D. directly proportional to BA piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.
A piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.A. The resistance of each of them increases.
B. The resistance of each of them decreases.
C. The resistance of copper decreases and that of germanium increases.
D. The resistance of copper increases and that of germanium decreasesMagnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?
Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?A. magnetic flux
B. magnetic field intensity
C. magnetic induction
D. self inductanceThe periodic alternation of sound between maximum and minimum loudness are called___________________?
The periodic alternation of sound between maximum and minimum loudness are called___________________?A. silence zone
B. interference
C. beats
D. resonance