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- 1. Fill in the Blank
An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:
- 2. Multiple Choice
A concave mirror produces a magnification of +4. The object is placed:
At the focus
Between focus and centre of curvature
Between focus and pole
Beyond the centre of curvature
- 3. Multiple Choice
A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:
120o
90o
45o
0o
- 4. Multiple Choice
A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:
A
B
C
D
- 5. Multiple Choice
Focal length of plane mirror is
At infinity
Zero
Negative
None of these
- 6. Multiple Choice
In optics an object which has higher refractive index is called
Optically rarer
Optically denser
Optical density
Refractive index
- 7. Multiple Choice
The number of images observable between two parallel mirrors is :
1
2
4
Infinity
- 8. Multiple Choice
Total internal reflection of light is possible when light enters from :
Water to air
Air to water
Vacuum to air
Air to glass
- 9. Multiple Choice
A man runs towards the plane mirror at 2 m/s. The relative speed of his image with respect to him will be:
4 ms⁻¹
2 ms⁻¹
8 ms⁻¹
10 ms⁻¹
- 10. Multiple Choice
Refractive index:
Depends on the wavelength of light used to measure
Is actual property of the substance
Depends on the angle of incidence
None of these
- 11. Fill in the Blank
Value of tan30°/cot60° is:
- 12. Multiple Choice
If cos A = 4/5, then tan A = ?
3/5
3/4
4/3
4/5
- 13. Multiple Choice
value of the expression
[cosec (75° + θ) – sec (15° - θ) – tan (55° + θ) + cot (35° - θ)] is
0
1
-1
None of these
- 14. Multiple Choice
sin A = 1/2 and cos B = 1/2,
then A + B = ?
00
300
600
900
- 15. Multiple Choice
If cos (A + B) = 0, then sin (A – B) is reduced to:
cos 2B
cos A
sin 2B
sin A
- 16. Fill in the Blank
cos 0°. cos 1°. cos 2°. cos 3°… cos 89° cos 90° is
- 17. Multiple Choice
If x and y are complementary angles, then
sin x = sin y
tan x = tan y
cos x = cos y
sec x = cosec y
- 18. Fill in the Blank
If A and (2A – 45°) are acute angles such that sin A = cos (2A – 45°), then tan A is equal to
- 19. Fill in the Blank
If sin θ + sin² θ = 1, then
cos² θ + cos4 θ = .....
- 20. Fill in the Blank
What is the minimum value of sin A,
0 ≤ A ≤ 90°
- 21. Fill in the Blank
If in ΔABC, ∠C = 90°,
then sin (A + B) =
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