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PHYSICS 2025
(Science General Group)
TIME: 3 Hours (85 Marks)
SECTION 'A' (Multiple Choice Questions)(17)
NOTE: (i)This section consists of 17 part questions and all are to be answered. (ii) Each question carries 1 mark. (iii) Do not copy the part questions in your answer book. Write only the answer in full against the proper number of the question and its part. (iv) The use of scientific calculator is allowed. All notations are used in their usual meanings.
1. Select the correct answer for each from the given options:
i) Average translational kinetic energy per mole of molecules of an ideal gas at any temperature "T" is: *32 KT *32 RT *23 KT *23 RT
ii) At this temperature all three states of water co-exist: *100°C *32°C *0.01°C *273K
iii) maximum work done is obtained in this process: *Isobaric *Isochoric *Isothermal✓ *Adiabatic
iv) The number of Neutrons in 92U235 is: *92 *235 *102 *143✓
v) 'tesla' is the unit of: *Magnetic Field *Magnetic Flux Density✓ *Magnetic Flux. *Magnetic Induction
vi) Population inversion occurs in: *Active Medium✓ *Passive Medium *Gaseous Medium *Vapour Medium
vii) In an inductive AC circuit the phase difference between current and voltage is: *0° *45° *60° *90°✓
viii) Reverse pressure of production of X-rays is: *Photoelectric effect *Compton's effect *Laser✓ *Pair Production
ix) This happen to the photon during the scattering in the compton's effect: *It gain energy and changes direction *It losses energy and changes direction✓ *It maintains energy and changes direction *It losses energy and maintains its direction
x) As the relative speed between an observer a rod increases, the observed length of the rod: *increases *decreases✓ *remains the same *fluctuates
xi) The Carnot engine is described as an ideal engine primarily because it is: *made of most advanced material *extremely powerful *free form heat losses and friction✓ *very small in size
xii) When a PN junction is reversed biased, the depletion region becomes: *narrower and less resistant *wider and more resistant✓ *thinner and more conductive *remain the same
xiii) This type of solid has a regular repeating atomic arrangement: *Polymeric solid *Amorphous solid *Glassy solid *Crystalline solid✓
xiv) Self-induced e.m.f is often called back e.m.f because: *It increases the current in the coil *It is always equal to applied voltage *It opposite the cause that produce it ✓ *It is generated in a separate coil
xv) In a refrigerator, a circulating fluid is used to: *generate heat *increase temperature of the cold reservoir *prevent energy transfer *exchange energy with the surrounding✓
xvi) An e.m.f of 10V is applied to the primary coil of a transformer having 50 turns and secondary coil has 100 turns. The output e.m.f is: *100V *20V ✓ *5V *10V
xvii) The dot product of magnetic field B and the area A is equal to: *Magnetic Flux *Magnetic Field *Electric Field *Electric Potential
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