Jharkhand Polytechnic Entrance Exam 2018 Paper – Physics

Jharkhand Polytechnic Entrance Exam 2018 Paper – Physics

From the following phenomenon, which one cannot be explained by assuming light always travels in straight line?
(a) Refraction
(b) Reflection
(c) Diffraction
(d) Transmission

Image formed by plane mirror
(I) Double the size of the object
(II) Half the size of the object
(III) Same as the size of the object
(Iv) Laterally inverted
(a) I is true
(b) II and IV are true
(c) III and IV are ture
(d) All are wrong

What is the nature of the image obtained from surface of the spoon bulged outward and to what type mirror we can approximate it do?
(a) Inverted and concave mirror
(b) Inverted and convex mirror
(c) Erect and convex mirror
(d) Erect and concave mirror

An object is kept at infinite distance, produces a bright and sharp image on the screen kept at a distance ‘x’ in front of concave mirror, then ‘x’ is equal to
(a) Radius of curvature
(b) Twice of the focal length
(c) Focal length of the mirror
(d) Object distance

Select correct option from the following about, nature and distance of the image formed by plane mirror.
(a) Real, inverted and at the same distance as object in front of the mirror
(b) Virtual, erect and at the same distance as object behind the plane mirror
(c) Virtual, erect and at a distance smaller than the object distance behind the plane mirror
(d) Virtual, erect and at a distance larger than the object distance behind the plane mirror

To get virtual image of an object by a concave, the object should be placed at
(a) Centre of the curvature
(b) Between centre of curvature and principle focus
(c) Principle focus
(d) Between principle focus and pole

To get powerful parallel beam of light, head light of vehicles have
(a) Concave lens
(b) Concave mirror
(c) Convex lens
(d) Plane mirror

What type of mirror is used to get virtual and erect image always?
(a) Plane mirror
(b) Convex mirror
(c) Concave mirror
(d) Both (a) and (b)

If magnification m=+1.5, then
(a) Size of the image = size of the object, real image
(b) Size of the image > size of the object, real image
(c) Size of the object > size of the image, virtual image
(d) Size of the object is twice the size of the image, virtual image

A pencil partially immersed in water appears to be displaced at the interface of air and water, this is due to
(a) Tyndall effect
(b) Scattering
(c) Dispersion
(d) Refraction