GameChanger Academy

Mechanics

1. Units, Dimensions and Errors

2. Vectors and Scalars

3. Motion in a Straight Line

4. Projectile Motion

5. Newton's Laws of Motion

6. Friction

7. Work, Energy, Power and Collision

8. Circular motion

9. Rotational motion

10. Simple Harmonic Motion

11. Gravitation

12. Elasticity

13. Surface Tension

14. Fluid dynamics and Viscosity

15. Hydrostatics

Heat and Thermodynamics

16. Thermometry

17. Thermal expansion

18. Calorimetry, Change of State and Hygrometry

19. Gas Laws and Kinetic theory of Gases

20. Transmission of Heat

21. Thermodynamics

Sound and Waves

22. Wave

23. Superposition of Waves

24. Stationary/ Standing waves

25. Doppler's effect and Musical sound

Optics

26. Reflection of Plane and Curved Mirrors

27. Refraction at Plane surfaces and Total internal reflection

28. Refraction through prism and Dispersion of Light

29. Refraction through Lenses

30. Chromatic abberation in Lenses, Optical instruments and Human eye

31. Velocity of Light

32. Photometry

33. Wave nature of Light

Electrostatics

34. Charge and Force

35. Electric Field and Potential

36. Capacitance

Electrodynamics

37. Electric current

38. Heating Effect of Current

39. Thermoelectricity

40. Chemical effect of Current

41. Meters

Electromagnetism

42. Properties of Magnets

43. Magnetic effects of Current

44. Electromagnetic induction

45. Alternating current

Modern Physics

46. Cathode rays, Positive rays and Electrons

47. Photoelectric effect

48. X-rays

49. Atomic structure and Spectrum

50. Radioactivity

51. Nuclear physics

52. Semiconductor and Semiconductor devices

53. Diode and Triode valves

54. Logic gates

55. Relativity and Universe

56. Particle physics

Optics

26. Reflection of Plane and Curved Mirrors

1. Two mirrors are at 60°, the number of image formed is

[BP 2012/2016]

2. An object is placed at a distance twice the focal length of concave mirror. Then image formed is:

[BP 2010]

Virtual and inverted
Real and erect
Real inverted and diminished
Real, inverted and of same size as object

3. A plane mirror is rotated by an angle θ. The change in deviation of a ray produced by the mirror is

[MOE 2012]

4. Power of a plane mirror in Dioptre is

[MOE 2011]

+1
-1
0
Infinity

5. A ray of light falls on the surface of a spherical glass paper weight making an angle α with the normal and is refracted in the medium at an angle β. The angle of deviation of the emergent ray from the direction of the incident ray is

[IOM 2009]

(α-β)
2(α-β)
1/2(α-β)
(β-α)

6. Concave mirror

[KU 2014]

Always forms real image
Always forms virtual image
Forms real image if object is virtual
Forms real image if object is real

7. The rear view mirror in a car is

[KU 2014]

Plane mirror
Concave mirror
Convex mirror
Plano convex mirror

8. An object is placed at 20 cm from a convex mirror of focal length 10 cm. The image formed by the mirror is:

[KU 2011]

Real and 20 cm from the mirror
Virtual and at 20 cm from the mirror
Virtual and at 20/3 cm from the mirror
Real and at 20/3 cm from the mirror

9. An ant moves towards the plane mirror with speed of 2 m/s & the mirror is moved towards the ant with the same speed. What is the relative velocity between the ant and its image?

[IOM 98/MOE 2064]

2 m/s
4 m/s
8 m/s
16 m/s

10. When a mirror is rotated through an angle 30° keeping incident ray constant then reflected ray is rotated through an angle

[KU 08]

25°
30°
60°
90°

11. Two mirrors A and B are inclined at angle θ. A ray of light incident in mirrors B is deviated to 62° and the angle of emergence is 20°, then find the angle of inclination.

[IOM 2066]

20°
30°
40°
50°

12. If an object is placed symmetrically between two plane mirrors inclined at an angle of 72°. The number of images will be

[IE-04]

4
5
6
Infinity

13. A concave mirror has radius of curvature 20 cm. An object is placed 10 cm from the pole of the mirror. The image will be at

[BPKTHS 01]

10 cm from the pole on same side
Infinity
20 cm from the pole on same side
Will not be formed

14. A person approaches a plane mirror with velocity v then the relative velocity of approach of person and his image is

[BPKIHS-96]

zero
v
2v
v/2

15. An object is moving towards a plane mirror with a velocity v making a certain angle θ with normal of a plane mirror. The velocity of image w.r.t object is

[]

vcosθ
vsinθ
2vcosθ
2vsinθ

16. A cubical room is formed with 6 plane mirrors. An object started to move along the diagonal of floor. The velocity of image in two adjacent walls is 20√2 cm/s, then the velocity of image along the diagonal of the roof is:

[]

20√2 cm/s
20 cm/s
40√2 cm/s
40 cm/s

17. Two plane mirrors are inclined at a certain angle undergoes a deviation of 300°. The number of images observe is

[]

18. Two plane mirrors inclined at an angle θ form 9 images of an object placed symmetrically between them. Then the angle θ is:

[]

36°
45°
60°
75°

19. A ray of light is incident on a plane mirror at an angle of incidence 30°. The ray after reflection is deviated through

[]

30°
60°
90°
120°

20. A person is approaching a plane mirror with speed 10 cm/s. If the initial distance between person and mirror is 2m, then the distance between person and his image after 2.5 sec will be

[]

0.75 m
1.5 m
0.25 m
0.5 m

21. It is desired to photograph the image of an object placed at a distance 3m from a plane mirror. The camera which is at a distance of 4.5m from the mirror should be focused at a distance of:

[]

3m
4.5m
6m
7.5m

22. A ray is reflected in turn by three plane mirrors mutually at right angles to each other. The angle between the incident and reflected rays is:

[]

0°
90°
180°
270°

23. Two inclined plane mirrors are inclined at an angle 60° with each other. A ray of light travelling horizontally is reflected first from one mirror and then from the other mirror. Then the resultant deviation is

[]

60°
120°
180°
240°

24. A ray of light incident to the first mirror and parallel to the second mirror is reflected from the second mirror parallel to the first mirror. The angle between two mirrors is

[]

30°
60°
75°
90°

25. A point object is placed on principal axis of a concave mirror of focal length 20cm at distance 30cm from pole. The image is formed at distance

[]

60cm behind mirror
60cm infront of mirror
12cm behind mirror
12cm infront of mirror

26. How far should an object be held from concave mirror of focal length 40 cm so as to obtain a real image twice the size of the object?

[]

10cm
20cm
30cm
60cm

27. A bright spot situated at 60cm in front of convex mirror forms a virtual image 20cm behind the mirror. The focal length of the mirror is:

[]

30cm
50cm
60cm
75cm

28. A shaving mirror of focal length f produces an image x times the size of the object. If the image is real, then the distance of the object from the mirror is:

[]

(x + 1)f
(x + 1)f/x
(x - 1)f/x
(x - 1)f

29. What is the magnification when the object is placed at 2f from the pole of a convex mirror?

[]

-1/3
-2/3
-1
-3/2

30. A spherical mirror produces an image of magnification 3. Then the distance of the object from the mirror may be, if the focal length of spherical mirror is 24cm

[]

32cm only
16cm only
32cm, 24cm
32cm, 16cm

31. A convex mirror of focal length 20cm produces an image 1/4 times the size of the object. Then the distance in between the object and its image is

[]

40cm
60cm
160cm
None

32. A spherical mirror produces an image 3 times of the size of object. If the image is erect and the distance between the object and its image is 100cm then the focal length of the spherical mirror is:

[]

15cm
25cm
27.5cm
37.5cm

33. A short linear object of length 'b' is placed along the axis of a concave mirror. The distance of object from the pole of a concave mirror is u. Then the size of the image is equal to:

[]

b(f/(u-f))
b(f/(u-f))²
b((u-f)/f)
b((u-f)/f)²

34. A luminous object is placed 50cm from surface of a convex mirror and a plane mirror is set so that virtual images in two mirrors coincide. If plane mirror is at a distance of 30cm from object, then focal length of convex mirror is:

[]

12.5cm
25cm
20cm
40cm

35. A rod of length 10cm is placed parallel to the principal axis of a concave mirror. The nearest point of a rod is at a distance of 50cm from the mirror. The focal length of the mirror is 30cm. Then the length of the image is

[]

10cm
15cm
20cm
25cm

36. A thin rod of length f/2 lies along the axis of concave mirror of focal length f such that its real elongated image just touches one end of the rod. The length of the magnified image is:

[]

37. A thin rod of length f/2 lies along the axis of concave mirror of focal length f such that its real diminished image just touches the end of the rod. The length of its image is:

[]

38. A square of side 3cm is placed at a distance of 25cm from a concave mirror of focal length 10cm. The centre of a square is passing through the principal focus and plane is normal to the principal axis. Then area of image is:

[]

1cm²
2cm²
3cm²
4cm²

39. The focal length of a concave mirror is f and the distance of the object to the principal focus is p. The ratio of the size of the image to the size of the object is:

[]

f/p
p/f
f²/p²
√(f/p)

40. Two plane mirror parallel to each other are 10m apart. An object is placed at a distance of 4m from one of the mirrors. What is the distance between two second images formed by the two mirrors?

[]

41. A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from the feet to the head he uses a plane mirror at a distance of 1m from him. The minimum height of the plane mirror required is

[KU 2015]

85cm
90cm
170cm
180cm

42. If the object is real, a convex mirror always forms

[IOM 2015]

Real and inverted image
Real and erect image
Virtual and erect image
Virtual and inverted image

43. Focal length of convex mirror is 30cm. If image is 1/5 times magnified. Then object distance will be?

[IOM 2015]

30cm
36cm
40cm
50cm