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 decreases
Physics
Two parallel beams of positrons moving in the same direction will……..?
A. repel each other
B. not interact with each other
C. attract each other
D. be deflected normal to the plane containing the two beams.
The core of a transformer is laminated to reduce energy losses due to……….?
A. Eddy currents
B. Hysteresis
C. Resistance in winding
D. None of these
Which of the following is true ?
A. Lyman series is a continuous spectrum.
B. Paschen series is a line spectrum in the infra red.
C. Balmer series is a line spectrum in the ultraviolet.
D. the spectral series formula can be derived from the Rutherford model of the hydrogen atom.
Electric current in a solid metal conductor is caused by the movement of what ?
A. Protons
B. Electrons
C. Metal atoms
D. Metal ions
A force On particle is conservative if:……..?
A. It’s works equals the change in the kinetic energy of the particle.
B. It’s obeys Newton’s second law
C. It’s obeys Newton’s third law
D. It work depends on the end points of every motion, not on the path between.
A Stone thrown from the top of a tall building follows a path that is:
A. Circular
B. Made of two straight line segments
C. Hyperbolic
D. Parabolic
The speed of light will be minimum while passing through ?
A. Vaccum
B. Glass
C. Water
D. Air
Farad is the unit of………..?
A. inductance
B. voltage
C. capacitance
D. None of these