Lecturer Physics Online Past MCQS Practice Test

Lecturer Physics Online Past MCQS Practice Test

Lecturer Physics Sample Papers, MCQs from Past Papers, Prepare Online Practice Test

(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   Next Page