# Optical Instruments Physics MCQs First year

FSC Physics MCQs Part 1 Physics Part 2 HSSC Pre Medical Pre Engineering text Book Questions first year and second-year Physics mcqs

A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called
A. center of curvature B. focus
C. optical center D. aperture
B
In going form a denser to rarer medium a ray of light is
A. undeviated B. bent away form the normal
C. bent towards the normal D. polarized
B
Dioptre power of an concave lens of 10 cm focal length is
A. 10 dioptre B. 10 dioptre
C. 1 / 10 dioptre D. 1 / 10 dioptre
B
If an object is placed away from 2f of a converging lens then the image will be
A. real and erect B. virtual and erect
C. real and inverted D. virtual
C
A convex lens gives a virtual image only when the objects lies
A. between principal focus and center of curvature B. beyond 2 f
C. at the principal focus D. between principal focus and optical center
D
Dispersional effect may produce error in light signals. This type of error
A. single mode step index fibre B. multimode step index fibre
C. multimode graded index fibre D. monomode step index fiber
C
Which one type of fibre is more suitable for transmission of signals in which white light is used ?
A. mono mode step index fibre B. multi mode step index fibre
C. multi mode graded index fibre D. single mode step index fibre
C
The electrical signals change into light signals for transmission through optical fibre. A light pulse represent
A. zero (0) B. One (1)
C. both zero (0) and one (1) D. neither zero (0) nor one (1)
B
If a convex lens of focal length f is cut into two identical halves along the lens diameter the focal length of each half is
A. f B. f/2
C. 2f D. 3f/2