ENTRANCE TEST – 2013 Multiple Questions and Answers.




21. A solenoid is cut into two halves. Magnetic induction due to same current in each half will be:
A. Half of the original
B. Double of the origina
C. Same as original
D. Four times of the original

22.A long straight current carrying conductor has current directed from bottom to top when held vertically. What will be the direction of magnetic field lines when observed from below the conductor?
A. Clockwise
B. Anti clockwise
C. Vertically upward
D. Vertically downward

23.X-rays from a given X-ray tube operating under specified conditions have a minimum wavelength. The value of this minimum wavelength could be reduced by:
A. Cooling the target
B. Reducing the temperature of the filament
C. Increasing the potential difference between the cathode and the target
D. Reducing the pressure in the tube

24.Helium-neon lasers are used for the:
A. Precise measurement of range finding
B. Optical fiber communication systems
C. Surveying for construction of tunnels
D. Welding detached bone of body

25.What is the type of characteristic X-ray photon whose energy is given by relation ‘hf = EM – EK’?
A. K – alpha
B. M – alpha
C. K – beta
D. M – beta

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