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