IMSU Physics 2012/2013 Past Questions

Practice each question, then open it to see the full details.

When an object is placed between the principal focus and the optical centre of a convex lens. It could be used as a?

A.compound microscope
B.simple microscope
C.projector
D.reflecting lens

The instrument used by designers to obtain different colour pattern is called

A.sextant
B.kaleidoscope
C.periscope
D.episcope

The production of pure spectrum could easily be achieved using a

A.triangular prism only
B.Triangular prism with two convex lenses.
C.glass prism with a pin
D.triangular prism with two concave lenses

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?

A.3.0 x 10^-10s
B.3.0 x 10^-11s
C.4.5 x 10^-10s
D.4.5 x 10^-11s

The phenomenon of light bending round an obstacle is

A.reflection
B.diffraction
C.Polarisation
D.Refraction

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

A.At the radius of curvature
B.at centre of curvature
C.At infinity
D.10cm from the focus

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

A.75.00 cm
B.18.75 cm
C.25.00 cm
D.37.50cm

Non luminous objects can be seen because they

A.Emit light
B.Are polished
C.Are near
D.Reflect light

A submarine is observed to rise from a real depth of 80m to 60m in water. Calculate the change in apparent depth (Refractive index of water = 4/3)

A.45m
B.60m
C.80m
D.15m

A real image three times the size of an object is formed 24cm from a converging mirror. What is the focal length of the mirror?

A.8cm
B.16cm
C.6cm
D.12cm