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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 |
The Following User Says Thank You to bear For This Useful Post: | ||
neha rana (Tuesday, April 19, 2011) |
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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 |
The Following 3 Users Say Thank You to bear For This Useful Post: | ||
dcet127 (Thursday, January 13, 2011), neha rana (Tuesday, April 19, 2011), very special 1 (Saturday, January 01, 2011) |
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