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. Which of the following quantities is a vector
A) Area
B) Volume
C) Angle
D) Speed
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. mass spectrograph determines
A) spectrum of light
B) charge of the ion
C) specific charge of the positive rays
D) specific charge of the cathode rays
Q. the dimensional representation of plancks constant is same as that of
A) momentum
B) torque
C) gravitational constant
D) angular momentum
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. A disc shaped magnet levitage above a superconducting material that has been cooled by liquid nitrogen. this happens because a superconductor is
A) Diamagnetic
B) Nonmagnetic
C) paramagnetic
D) Ferromagnetic
Q. Thermonic emission was discovered by
A) Thomas Edison
B) lee de forest
C) fleming
D) Rutherford
Q. When a metal is heated it emits predominantly
A) electrons
B) protons  
C) positrons  
D) neutrons
Q. Superposition of two waves trains of amplitudes and nearly same frequiencies, moving in the same direction, results in the formation of beats. The maximum loudness heard at the waxing is 'n' times the loudness of each of the componet wave trains. the value of n is
A) 1
B) 2
C) 4
D) 8
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
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