Related InterviewSolutions

• In and atom an electron excites to the fourth orbit. When it jumps back to the energy levels a spectrum is formed. Total number of spectral lines in this spectrum would be (A)   3(B)   4(C)   5 (D)   6 
• A vertical narrow wire is illuminated with laser. Alternate dark and bright bands are formed on a graph paper pasted on a distant wall. Indicate the correct statement/s. (a)  making appropriate measurements, it is possible to determine the diameter of the wire (b)  this phenomenon exhibits that light does not follow rectilinear paths (c)  this is a case of Fraunhoffer diffraction (d)  this is a case of interference of an infinitely large number of Huygens's secondary waves leading to a diffraction pattern
• Which one of the following statements is not a tautology ?(1)  P → (p ∨ q)(2)   (p ∧ q) → (~p) ∨ q(3)  (p  ∧ q) → p (4)   (p ∨ q) → (p) ∨ (~q) 
• Which one of the following devices does not respond to the intensity of light incident on it ?(A)  Photoresistor (LDR)(B)  Photodiode(C)  Light Emitting Diode(D)   Solar Cell
• The equation correctly represented by the following graph is (a and b are constants)(A)   x + y = b(B)   ax2 + by2 = 0 (C)   x + y = ab (D)  y = axb
• A ball is dropped onto a horizontal surface from a height of 36 cm. After bouncing several times it comes to rest covering a total distance of 100 cm measured in a vertical direction. The percentage loss in its kinetic energy after its first impact is(a) 36 (b) 64 (c) 53 (d) 96 
• The frequency of the pendulum having maximum amplitude is (a)  f0 / 2 (b)  f0 (c)   2 f0 (d)  not related to  f0
• Which of the following will give a straight line graph? (a) log A against t (b) log A against1/t (c) A against t2 (d) A2 against t
• The variation of amplitude A with respect to time t is shown as
• An object is placed 30 cm away from a symmetric convex lens and an image two thirds of the size of the object is produced. The object is moved by a distance of 20 cm so as to get a magnified image. Now we get (a)  a real image of magnification (b)  a virtual image of magnification 5 (c)  a real image at a distance of 40 cm (d)  a virtual image at a distance of 60 cm