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PHYSICS 2025
(Science Pre-Engineering & Pre-Medical Groups)
TIME: 3 Hours (85 Marks)
SECTION 'A' (Multiple Choice Questions)(17)
NOTE:
i) If charge on a particle moving in a magnetic field is doubled, while its velocity remains same, magnetic force on the particle will be: *Doubled✓ *Halved *Constant *Quadrupled
ii) According to Charle's law: *VT =constant, when pressure is constant *V/T =constant, when pressure is constant✓ *PV =constant, when temperature is constant *V/P =constant, when temperature is constant
iii) The Primary purpose of a truth table in digital electronics is to: *Determine input voltage *Measure circuit resistance *Calculate circuit power *Analyze output states based on input states✓
iv) An example of an inertial frame of reference in our daily life is: *Accelerating car *Train moving with constant velocity✓ *Spinning platform *Aeroplane encountering turbulence
v) The least number of energy levels required for LASER action are: *Two *Three ✓ *Four *Five
vi) If the temperature of a gas is tripled in Kelvin at constant volume, the pressure of the gas will be: *Double *Quadruple *One third *Triple✓
vii) A thermodynamics process at constant volume is called: *Isothermal *Isochoric✓ *Adiabatic *Isobaric
viii) The net change in entropy of a system in a natural process is always: *Positive✓ *Negative *Zero *Infinite
ix) In purely resistive AC circuit, the phase difference between current and voltage is: *0° ✓ *45° *90° *180°
x) Property o a body by virtue of which, it tends to regain its original size and shape, when the applied force is removed this characteristics is called: *Elasticity✓ *Rigidity *Plasticity *Compressibility
xi) An object is moving at a good of 0.9c and its mass is 1kg its relative mass will be: *Infinite *1.2kg *2.3kg✓ *1kg
xii) In an alternating current generator electrical energy is obtained by the conversion of: * Wind energy * Mechanical Energy✓ *Solar energy * Chemical energy
xiii) Least amount of energy required to emit an electron from surface of metal, in photoelectric effect is called: *Threshold frequency *Binding energy *Work function ✓ *Stopping potential
xiv) To Produce X-rays, an element of high atomic weight is bombarded by: *Photon *Electrons✓ *Helium *Neutron
xv) XA → z+1YA + -1e0, this equation presents: *y – emission *α – emission *β – emission ✓ *neutron – emission
xvi) In fission and fusion reaction energy is released due to: *Chemical reaction *Breaking of bond *Conversion of matter in energy✓ *Combustion process
xvii) This derive is not used in diesel engine: *Outlet valve *Piston *Sparking plug✓ *Injector
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