Science Quiz

Q1: The angle of incidence for a ray of light is 45°. The angle of Reflection will be:
(a) 90°
(b) 45°
(c) 180°
(d) 0°

Q2: The focal length of a spherical mirror of radius of curvature 40 cm is
(a) 20 cm
(b) 40 cm
(c) 80 cm
(d) None of these

Q3: The mirror used in vehicles is
(a) Convex
(b) Concave
(c) Plane
(d) None of these

Q4: An object is placed at a distance of 10 cm in front of a plane mirror. The image is formed behind the mirror at a distance of
(a) 30 cm
(b) 10 cm
(c) 5 cm
(d) 40 cm

Q5: Which of the following is correct mirror formula
(a) f = v − u
(b) 1/f = 1/v – 1/u
(c) f = v + u
(d) 1/f = 1/v + 1/u

Q6: When ray of light goes from denser to rarer medium then it
(a) deviates towards the normal
(b) deviates away from the normal
(c) goes deviated
(d) reflected back

Q7: The power of a lens of focal length 25 cm is
(a) + 40 D
(b) 0.4 D
(c) + 4 D
(d) – 2 D

Q8: The apparent depth of a coin inside water tab decreases due to
(a) Refraction of light
(b) Reflection of light
(c) Total internal reflection
(d) Dispersion of light

Q9: The S. I. unit of refractive index is
(a) meter
(b) cm
(c) watt
(d) no unit

Q10: The lens used in a simple microscope is
(a) Concave
(b) Convex
(c) Cylindrical
(d) None

Q11: What is the magnification of an astronomical telescope in normal adjustment, if the focal length of eye lens is 4 cm and focal length of object lens is 120 cm
(a) 30
(b) 60
(c) 120
(d) 124

Q12: The least distance of distinct vision for a normal human eye is
(a) 10 cm
(b) 25 cm
(c) 50 cm
(d) 60 cm

Q13: The image formed in a compound microscope is
(a) erect
(b) inverted
(c) sometimes erect, sometimes inverted
(d) none

Q14: What will be total magnification of a compound microscope, if the magnification of object lens is 5 and of eye lens is 10
(a) 2
(b) 15
(c) 50
(d) 10

Q15: Which of the following is not a primary colour
(a) Red
(b) Blue
(c) Green
(d) Yellow

Q16: Which colour of light is deviated least
(a) Red
(b) Blue
(c) Violet
(d) Green

Q17: Which of the following is a comet
(a) Halley
(b) Mars
(c) Venus
(d) Moon

Q18: Time period of a satellite in geo-stationary orbit is
(a) one year
(b) 24 hours
(c) 10 hours
(d) 12 hours

Q19: Parsec is the unit of
(a) Energy
(b) Work
(c) Distance
(d) Speed

Q20: The planet nearest to earth is
(a) Mercury
(b) Saturn
(c) Jupiter
(d) Venus

ANSWERS:
1: (b) 45°
2: (a) 20 cm [Focal length is half of the radius of curvature of spherical mirror]
3: (a) Convex [always give erect images, have wider back view]
4: (b) 10 cm
5: (d) 1/f = 1/v + 1/u
6: (b) deviates away from the normal
7: (c) + 4 D
8: (a) Refraction of light
9: (d) no unit
10: (b) Convex
11: (a) 30
12: (b) 25 cm
13: (b) inverted
14: (b) 15
15: (d) Yellow
16: (a) red
17: (a) Halley
18: (b) 24 hours
19: (c) Distance
20: (d) Venus

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