Q. A charged particle moves through a magnetic field perpendicular to it. The energy of the particle
A) increases
B) decreases
C) remains unchanged
D) first increase and then decreases
Q. The second law of thermodynamics introduces the concept of
A) Heat
B) Temperature
C) Entropy
D) Internal energy of the system
Q. Which of the following quantities is a vector
A) Area
B) Volume
C) Angle
D) Speed
Q. when a charged particle moves in a transverse magnetic field, it path of motion is
A) parabolic
B) circular
C) elliptical
D) linear
Q. The manifestation of band structure in solids is a consequence of
A) Pauli's exclusion principle
B) Heisenberg's uncertainity principle
C) Bohr's principle  
D) Ohm's law
Q. an electric or magnetic field cannot accelerate
A) electrons
B) protons
C) neutrons
D) alpha particles
Q. The saturation current in diode valve depends upon
A) plate voltage
B) temperature of the filament
C) neither a nor b
D) both a and b
Q. in a halfwave rectifier the rms valve of the a.c component of the wave is
A) greater than d.c value
B) less than d.c value
C) equal to d.c value
D) zero
Q. an electron moves with a constant velocity V parallel to the direction of uniform magnetic field B. the force experienced by the electron is
A) BeV
B) eV/B
C) B/eV
D) zero  
Q. When a metal is heated it emits predominantly
A) electrons
B) protons  
C) positrons  
D) neutrons
Today Challenging Question
Q. If a boat is moving in upstream with velocity of 14 km/hr and goes downstream with a velocity of 40 km/hr, then what is the speed of the stream ?
A) 13 km/hr
B) 26 km/hr
C) 34 km/hr
D) none of these
2 members solved
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