Encyclopedia of Solved Past Papers

# Lecturer Physics MCQs Past Papers

PPSC Lecturer Past Papers & MCQs, SPSC Lecturer Past Papers & MCQs, FPSC Lecturer Past Papers & MCQs, KPPSC Lecturer Past Papers & MCQs, BPSC Lecturer Past Papers & MCQs, AJKPSC Lecturer Past Papers & MCQs.

#### Lecturer Physics MCQs Past Papers

(1) If A= 6i-8j, then 4A has the magnitude:
(a) 40 (b) 10  (c) 20  (d) None of these
2)  Let A= 2i+6j-3k and B= 4i+2j+k then A.B equals:
(a) 8i+12j-3k (b) 17  (c) 23  (d) None of these
3) If V is an operator, then V.V means:
(a) Gradient of a Scalar field  (b) Curl of a vector field
(c) Divergence of a Vector field  (d) None of these
4)  The volume of a parallelepiped bounded by Vectors A,B and C can be obtained from the
expression:
(a) ( A x B ).C  (b) (A.B)x C  (c) ( A x B ) x C  (d) None of these
5)  A force acting on a particle is conservative if:
(a) It obeys Newton’s third law  (b) It obeys Newton’s second law
(c) It works equals the change in Kinetic energy (d) None of these
6)  A torque applied to a rigid object always tends to produce:
(a) A rotational acceleration  (b) A linear acceleration
c) Precision  (d) None of these
7)  When the velocity of a body is constant, its acceleration is:
(a) Maximum  (b) Zero  (c) Infinity  (d) None of these
8) In the absence of external torque the total angular momentum is:
(a) Constant (b) Zero  (c) infinity  (d) None of these
9)  The rate of change of Momentum of the particle is:
(a) Energy (b) Force  (c) Impulse  (d) None of these
10)  The intensity of a wave is proportional to the square of:
(a) Amplitude (b) Time  (c) Intensity  (d) None of these
11) The colours in soap bubbles, oil slick etc. in a thin film is due to:
(a) Diffraction  (b) Polaristaion  (c) Interference  (d) None of these
12) For higher resolution, in a diffraction grating, one needs to have:
(a) Large number of ruling  (b) Small number of ruling
(c) No rulings at all  (d) None of these
13) To produce interference, the sources must be:
(a) Intense (b) Incoherent  (c) Coherent  (d) None of these
14) Interference fringes are of:
(a) Unequal width (b) Equal width  (c) Variable width (d) None of these
15) A Carnot Cycle is:
(a) a rectangle on a P-V graph (b) bounded by two isotherms and two adiabatics
(c) any four sided process on a P-V graph (d) None of these
16) In an Adiabatic process:
(a) The temperature of the system remains constant
(b) The temperature of the system must change
(c) The internal energy of the system remains constant
(d) None of these
17) A Carnot Cycle heat engine operates between 227°C and 127° C. Its efficiency is:
(a) 44%  (b) 20%  (c) 79%  (d) None of these
18) Metals pipe carrying water some times bursts in winter because:
(a) Water expands (b) Ice expands when melts
(c) Metal contracts more than water (d) None of these
19) A Fahrenheit thermometer and Celsius thermometer shows the same reading at:
(a) 200° (b) -40°  (c) 100°  (d) None of these
20)  Constructive and destructive superposition of waves is observed in:
(a) Polarisation (b) Interference  (c) Diffraction  (d) None of these
21) A Watt – sec is a unit of:
(a) Force  (b) Energy  (c) Power  (d) None of these
22) The direction of any magnetic induction effect is such as to oppose the cause of the effect. This is:
(a) Coulumb’s Law (b) Ampere’s Law  (c) Lenz’s Law  (d) None of these
23)  A magnetic field cannot:
(a) accelerate a charge (b) Exert a force on a charge
(c) change the kinetic energy of a charge (d) None of these
24)  The inverse of resistivity is called Conductivity. Its unit is:
(a) Ohm-1(b) ohm-metre  (c) (ohm-meter)-1(d) None of these
25  An LRC Circuit has R= 4Ω, Xc = 3 and XL=6, the impedence of the circuit is:
(a) 5 Ω  (b) 7 Ω  (c) 13 Ω    (d) None of these
26)  A “step-down” transformer is used to:
(a) increase the power (b) decrease the voltage (c) Increase the voltage (d) None of these
27) Electrical potential is the potential energy per unit:
(a) Charge (b) Voltage  (c) Force  (d) None of these
28) The force on a charge moving with the velocity in a magnetic field B is given by:
(a) F = (q/v x B)  (b) F = ( qv x B )  (c) F = (qv + B) (d) None of these
29) A changing current “i” in any circuit induces an emf “e” in that circuit, which is equal to:
(a) e = di/dt (b)  E = i dΦ/dt  (c) e = – L di/dt  (d) None of these
30)  Inductive reactance of an inductor is:
(a) XL= ω2L  (b) XL= ω/L  (c) e = -L di/dt  (d) None of these
31) The resonant frequency of an LC-Circuit is:
(a)  f = 2Π LC  (b)  f = 1 / 2Π√ LC  (c) f = 1/ 2LC  (d) None of these
32) The deliberate addition of an impurity element in a semi-conductor is called:
(a) doping  (b) annealing  (c) mixing  (d) None of these
33) The conversion of AC into DC is called:
(a) amplification (b) rectification  (c) modulation (d) None of these
34) The Laser light is:
(a) monochromatic (b) coloured  (c) chromatic  (d) None of these
35) The Laser light may be obtained from:
(a) quartz crystal (b) NaCl crystal  (c) ruby crystal  (d) None of these
36) The emission of photoelectrons in photoelectric effect is dependent on:
(a) threshold frequency (b) intensity of light (c) Nature of metal (d) None of these
37) Which one of the following is NOT needed in Nuclear Fission reactor:
(a) fuel  (b) accelerator  (c) moderator (d) None of these
38) The half life of a radioactive isotope is 140 days. How many days would it take to loose 3/4 of its
initial activities:
(a) 105 days  (b) 280 days  (c) 35 days (d) None of these
39) Most of the energy produced in Sun is due to:
(a) Nuclear fusion (b) Chemical reaction  (c) Nuclear Fission (d) None of these
40) A U-235 nucleus will split when it captures:
(a)  an α-particle (b) e.m. radiation  (c) neutron  (d) None of these
41)  Two particles each of mass 5.0kg are mounted 4.0m apart on a mass-less light rod which is
capable of rotation about its center? The moment of inertia is:
(a) 1.25 kgm2(b) 20 kgm2(c) 40 kgm2(d) None of these
42)  The time period of mass of 1kg attached to a spring of spring constant of 100N/m is:
(a) 0.2π(b)  π(c) 2π(d) None of these
43)  A 14cm inner diameter water main furnishes water (through intermediate pipes) to a 1.00cm inner
diameter faucet pipe. If the average speed in the faucet pipe is 3.0 cm/s, what will be the average
speed it causes in the water main?
(a) 0.015 cm/s (b) 0.15 m/s (c) 0.5 m/s (d) None of these
44)  What is the tension T in the rope if a 10N weight is being pulled upward by it with a constant
velocity of 2m/s?
(a) 12N (b) 8N (c) 5N (d) None of these
45)  The ratio of linear Stress/Linear Strain is called:
(a) Young’s Modulus (b) Bulk Modulus (c) Deformation (d) None of these
46)  A body is moving with constant speed in a circle, its velocity vector:
(a) Remains constant (b) Changes its magnitude (c) Changes its direction
(d) None of these
47)  When a constant torque is acting on a rotating system, which of the following is constant?
(a) Angular velocity (b) Angular acceleration (c) Angular momentum
(d) None of these
48)  A geo-stationary satellite revolves around the earth from:
(a) East to west (b) West to east (c) North to south (d) None of these
49) According to Einstein, with the great i
ncrease in the speed of a body, the relativistic is:
(a) Length remains constant (b) Time decreases
(c) Mass increases (d) None of these
50) A body is moving northward and the force applied is eastward, the acceleration produced is:
(a) Northward (b) At 45oEast of North (c) Eastward (d) None of these
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