Science Physics MCQ-171

General Science-Physics MCQ test for SSC, CivilsPrelims, DelhiPolice, CDS, UPSC, UPPSC, NDA, RBI Exams

Two plane mirrors A and B are placed at a distance 12 cm apart facing towards each other. An object is placed in between them at a distance 8 cm from the mirror A. What will be the distance between them at a distance 8 cm from the mirror A What will be the distance between the first two images, formed in the mirror B ?


The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens ?


The image formed on the retina of a human eye is


A lens, immersed in a liquid becomes in visible when


An equi convex lens is prepared from a glass of refractive index 1 . The radius of curvature of the surface is 0 .5 m. The focal length of the lens is


A light wave travelling in a transparent homogeneous medium enters another homogeneous transparent medium of higher refractive index. The speed of light in the second medium


In a healthy human eye, the focussing is done by the


Consider the following statements

(1) compound microscope has and objective lens with a very short focal length
(2) simple microscope consists of a strong converging lens system
(3) television camera convents the optical images into electrical video signals
(4) Hypermetropia is corrected by using a diverging lens.

Which of these statement is/are correct ?


Two plane mirrors are inclined at an angle of 60e to each other. If an object is placed between them, the number of images produced will be


The magnifying power of a telescope can be increased by-


An object is kept 5 cm in front of a concave mirror of focal length 15 cm. What will be the nature of the image ?


Different objects at different distances are seen by the eye. The parameter that remains. Constant is-


How for must a girl stand in front of a concave spherical mirror of radius 120 cm to see an erect image of her face four times its natural size ?


In a simple microscope, the lens in held at a distance


A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens ?


Consider the following statements


Which one of the following is used to remove astigmatism for a human eye ?


What is the essential difference between a terrestrial telescope and an astronomical telescope ?


Abeam of light travelling at a velocity of V m/s is incident at an angle 450 on a glass. Slab of refractive index 1 . What is the velocity of the beam of light inside the slab ?


Optical fibre works on the principle of


Suppose a rocket ship is receding from the earth at a speed of 1/10 th the velocity of light. A light in the rocket ship appears blue to the passengers on the ship. What colour would it appear to an observer on the earth ?


An air bubble in water will act like a


Total internal reflection can take place when light travels from


When a CD (compact disc used in audio and video systems) is seen in sunlight. Rainbow like colours are seen. This can be explained on the basis of the phenomenon of


Assertion (A) : Small glass beads fixed on traffic signal glow brightly when light falls upon them.

Reason (R) : Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.