Mock Test

Optics part (2)

by mocktest
Updated On:

Total Questions: 45

11. In driving a car which type of mirror would you like to use for observing traffic at your back ? [U.P.P.C.S.(pre) 1991, Uttarakhand P.C.S.(PRE) 2005]

Correct Answer: (c) convex mirror
Solution:A convex mirror gives a much wider field of view of the traffic at your back then a plain mirror of the same size. It always forms an erect and diminished image and they also have a wider field of view as they are curved outwards.

12. Which one of the following types of the mirror is used to see the traffic behind the car ? [U.P.P.C.S. (pre) 2015]

Correct Answer: (a) convex mirror
Solution:A convex mirror gives a much wider field of view of the traffic at your back then a plain mirror of the same size. It always forms an erect and diminished image and they also have a wider field of view as they are curved outwards.

13. Which mirror is used as a rear view mirror in vehicles ? [U.P.P.C.S. (pre) 2011, U.P.P.C.S. (mains) 2010]

Correct Answer: (b) convex
Solution:A convex mirror gives a much wider field of view of the traffic at your back then a plain mirror of the same size. It always forms an erect and diminished image and they also have a wider field of view as they are curved outwards.

14. The image formed by concave mirror is real, inverted and of the same size as that of the object. The position of the object should be : [B.P.S.C. (Pre) 2023]

Correct Answer: (b) at the centre of curvature
Solution:If an object is placed at the centre of curvature of a concave mirror, then the image formed is real, inverted and of the same size as that of the object. The image formed is not magnified.

15. A person standing in front of a mirror finds his image larger than himself. This implies that the mirror is: [67th B.P.S.C.(PRE) 2022]

Correct Answer: (a) concave
Solution:A person standing in front of a mirror finds his image larger than himself implies that the mirror is concave. A spherical mirror, whose reflecting surface is curved inwards, that is, faces towards the centre of the sphere, is called a concave mirror.

Concave mirrors are commonly used in torches, search-lights and vehicles' headlights to get powerful parallel beams of light. They are often used as shaving mirrors to see a large image of the face. Dentists use concave mirrors to see large images of the teeth of patients.

16. For shaving one uses - [43rd B.P.S.C. (PRE) 1999]

Correct Answer: (a) concave mirror
Solution:People use a concave mirror for shaving because when a man standing between the principle focus and a pole of a concave mirror he sees as enlarged the erect and virtual image of his face. This is the reason why a concave mirror of a large focal length is used for shaving.

17. The mirror which is used in searchlights is - [U.P.P.C.S.(mains) 2009]

Correct Answer: (a) concave mirror
Solution:concave mirror is used in the headlights of cars and in searchlight .A light is placed at the focus of concave lens can form a parallel beam and is used in car headlight and searchlights.

18. The mirror used by a dentist to examine the teeth of the patient is [U.P.P.C.S. (pre) 2013, U.P.P.C.S. (pre) (re.exam) 2015]

Correct Answer: (a) concave
Solution:concave mirror is used in the headlights of cars and in searchlight .A light is placed at the focus of concave lens can form a parallel beam and is used in car headlight and searchlights.

19. In order to avoid sunlight which of the following colour combination for an umbrella is most appropriate ? [U.P.P.C.S.(pre) 1993]

Correct Answer: (b) top white and bottom black
Solution:In order to avoid sunlight heat option (b) top of the white and bottom black combination for an umbrella is most appropriate the outer colour will reflect most of the radiation while the black colour inside will absorb anything passing through the outer layer.

20. The image formed by astronomical telescope is - [U.P.P.C.S.(MAINS) 2013]

Correct Answer: (b) virtual and magnified
Solution:Astronomical telescope consists of two convex lenses: Objective and Eyepiece.

The final image formed by the astronomical telescope is inverted, virtual and highly magnified.

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