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Old Sunday, December 19, 2010
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Lightbulb 2010 physics paper solution

paper 1

Q.1. Select the best option/answer and fill in the appropriate box on the Answer Sheet.

(i) If A= 6i-8j, then 4A has the magnitude:

(a) 40
(b) 10
(c) 20
(d) None of these

(ii) 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

(iii) 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 [B]
(d) None of these (its Laplacian)

(iv) 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

(v) 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 (work done in a closed loop = 0 ie. independant of the path)


(vi) 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

(vii) When the velocity of a body is constant, its acceleration is:
(a) Maximum
(b) Zero
(c) Infinity
(d) None of these

(viii) In the absence of external torque the total angular momentum is:
(a) Constant
(b) Zero
(c) infinity
(d) None of these

(ix) The rate of change of Momentum of the particle is:
(a) Energy
(b) Force
(c) Impulse
(d) None of these

(x) Constructive and destructive superposition of waves is observed in:

(a) Polarisation
(b) Interference
(c) Diffraction
(d) None of these

(xi) The intensity of a wave is proportional to the square of:
(a) Amplitude
(b) Time
(c) Intensity
(d) None of these

(xii) 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

(xiii) 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

(xiv) To produce interference, the sources must be:

(a) Intense
(b) Incoherent
(c) Coherent
(d) None of these


(xv) Interference fringes are of:

(a) Unequal width
(b) Equal width
(c) Variable width
(d) None of these

(xvi) 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


(xvii) In an Adiabatic process:
(a) The temperature of the system remains constant
(b) The temperature of the system must change ( doubt)
(c) The internal energy of the system remains constant
(d) None of these

(xviii) 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

(xix) Metals pipe carrying water some times bursts in winter because:
(a) Water expands (when it cools on becoming ice ) ( doubt)
(b) Ice expands when melts
(c) Metal contracts more than water
(d) None of these

(xx) A Fahrenheit thermometer and Celsius thermometer shows the same reading at:
(a) 200°
(b) -40°
(c) 100°
(d) None of these
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Old Sunday, December 19, 2010
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paper 2
Q.1. Select the best option/answer and fill in the appropriate box on the Answer Sheet. (20)

(i) A Watt – sec is a unit of:
(a) Force
(b) Energy
(c) Power
(d) None of these

(ii) 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

(iii) 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 ( F=q v x b )

(iv) The inverse of resistivity is called Conductivity. Its unit is:
(a) Ohm-1
(b) ohm-metre
(c) (ohm-meter)-1
(d) None of these

(v) 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

(vi) A "step-down" transformer is used to:
(a) increase the power
(b) decrease the voltage
(c) Increase the voltage
(d) None of these

(vii) Electrical potential is the potential energy per unit:
(a) Charge
(b) Voltage
(c) Force
(d) None of these

(viii) 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

(ix) 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

(x) Inductive reactance of an inductor is:
(a) XL= ω2L
(b) XL = ω/L
(c) e = -L di/dt
(d) None of these (XL = ω.L )

(xi) 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

(xii) The deliberate addition of an impurity element in a semi-conductor is called:
(a) doping
(b) annealing
(c) mixing
(d) None of these

(xiii) The conversion of AC into DC is called:
(a) amplification
(b) rectification
(c) modulation
(d) None of these

(xiv) The Laser light is:
(a) monochromatic
(b) coloured
(c) chromatic
(d) None of these

(xv) The Laser light may be obtained from:
(a) quartz crystal
(b) NaCl crystal
(c) ruby crystal
(d) None of these

(xvi) 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

(xvii) Which one of the following is NOT needed in Nuclear Fission reactor:
(a) fuel
(b) accelerator
(c) moderator
(d) None of these

(xviii) 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

(xix) Most of the energy produced in Sun is due to:
(a) Nuclear fusion
(b) Chemical reaction
(c) Nuclear Fission
(d) None of these

(xx) A U-235 nucleus will split when it captures:

(a) an α-particle
(b) e.m. radiation
(c) neutron
(d) None of these
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