Jharkhand Polytechnic Entrance Exam 2019 Paper – Physics

Jharkhand Polytechnic Entrance Exam 2019 Paper – Physics

Image formed by a plane mirror is always
(a) Virtual and erect
(b) Real and inverted
(c) Virtual and inverted
(d) Real and erect

The imaginary line passing through the center of curvature and pole of a spherical mirror is
(a) Principal focus
(b) Principal axis
(c) Focal length
(d) Parallel ray

A ray parallel to the principal axis after reflection from a concave mirror will pass through
(a) Principal focus
(b) Principal axis
(c) Radius of curvature
(d) Center of curvature

The size of the image formed by a convex mirror when an object is placed at infinity is
(a) Point sized
(b) Enlarged
(c) Large
(d) Same size

The type of mirror used by dentists to see larger images of the teeth of patients is
(a) Concave
(b) Convex
(c) Plane
(d) Plano-convex

The ratio of sine of angle of incidence to the sine of angle of refraction is a constant for given pair of media. This law is known as
(a) Maulas law
(b) Snell’s law
(c) Stegan’s law
(d) Pascal’s law

Which among the following has a larger refractive index?
(a) Ice
(b) Carbon
(c) Diamond
(d) Ruby

The effective diameter of the circular outline of a spherical lens is called
(a) Aperture
(b) Optic center
(c) Pole
(d) Principal focus

The focal length of a plane mirror is
(a) Zero
(b) One
(c) Infinity
(d) Two

SI unit of power of a lens is
(a) Metre
(b) Dioptre
(c) Centimeter
(d) Steradian

Retina of the eye is a
(a) Light sensitive screen
(b) Lens
(c) Object
(d) Aperture

The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is called
(a) Presbyopia
(b) Accommodation
(c) Near sightedness
(d) Far sightedness

The change in focal length of an eye lens is caused by the action of the
(a) Pupil
(b) Retina
(c) Cilliary muscles
(d) Iris

The power of accomodation of the eye usually decreases with ageing. This condition is called as
(a) Myopia
(b) Presbyopia
(c) Hypermetropia
(d) Astigmatism

Among the following colours which bends the most when white light undergoes dispersion is
(a) Indigo
(b) Red
(c) Orange
(d) Yellow