Question Library

In a large telecommunications auditorium, perforated absorbent materials are used to line the ceiling so as to

The phenomenon of light bending round an obstacle is?

The instrument used by designers to obtain different color pattern is called?

A glass plate 0.9cm thick has a refractive index of 1.50. How long does it take for a pulse of light to pass through the plate? [c = 3.0 x 10\(^8\) ms-1]

When an object is placed between the principal focus and the optical center of a convex lens, it could be used as a?

The production of pure spectrum could easily be achieved using a?

The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is

An object placed 10cm from a concave mirror of focal length 5cm would have its image

A submarine is observed to rise from a real depth of 80 m to 60 m in water. Calculate the change in apparent depth. [Refraction index of water \(\frac{4}{3}\)]

Non-luminous object can be seen because they

The wavelength of the first overtone of a note in a closed pipe of length 33 cm is?

A person can focus objects when they lie beyond 75 cm from his eyes. The focal length of the lens required to reduce his least distance of distinct vision to 25 cm is?

A mirror of weight 75N is hung by a cord from a hook on the wall. If the cord makes an angle of 30o with horizontal, the tension in the cord is

A progressive wave equation is represented by y = a sin(150 \pit - \(\frac{\pix}{4}\)). if the phase difference of a progressive wave is 45^\circ, the value of x in the equation is

The frequency of the wave in the diagram above is