Physics Test 177

Result

Physics Test 177

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Question 1
4 / -1

In the figure shown a convex mirror of radius of curvature 20 cm is shown. An object O is placed in front of this mirror. Its ray diagram is shown. How many mistakes are there in the ray diagram (AB is its principal axis):

A
3

B
2

C
1

D
0

Solution
Question 2
4 / -1

For a real object, all of the following statements are correct except :

A
the magnification produced by a convex mirror is always less than one (except at the pole)

B
a virtual, erect, same sized image can be obtained by using a plane mirror

C
a virtual, erect, magnified image can be formed using a concave mirror

D
a real, inverted, same sized image can be formed using a convex mirror.

Solution

For a real object a convex mirror always form a virtual image.
Question 3
4 / -1

In the figure shown find the total magnification after two successive reflections first on M₁ & then on M₂

A
+1

B
-2

C
+2

D
-1

Solution
Question 4
4 / -1

A particle revolves in clockwise direction (as seen from point A) in a circle C of radius 1 cm and completes one revolution in 2 sec. The axis of the circle and the principal axis of the mirror M coincide. Call it AB. The radius of curvature of the mirror is 20 cm. Then the direction of revolution (as seen from A) of the image of the particle and its speed is

A
Clockwise, 1.57 cm/s

B
Clockwise, 3.14 cm/s

C
Anticlockwise, 1.57 cm/s

D
Anticlockwise, 3.14 cm/s

Solution

the image revolves in circle or radius 1/2 cm. image of a radius is erect ⇒particle will revolve in the same direction as the particle. The image will complete one revolution in the same time 2s.
Question 5
4 / -1

The relative refractive index of glass with respect to a material is 0.9 and the absolute refractive index of glass is 1.512. The refractive index of the material is

A
1.42

B
1.58

C
1.68

D
1.72

Solution
Question 6
4 / -1

A lens of focal length 20.0 cm and aperture radius 2.0 cm is placed at a distance 30.0 cm from a point source of light. On the other side a screen is placed at a distance 50.0 cm from the lens. The radius of spot of light formed on screen is. (Neglect spherical abberation through lens)

A
1/2 cm

B
1/3 cm

C
1/5 cm

D
1 cm

Solution
Question 7
4 / -1

A convex lens is cut into two parts in different ways that are arranged in four manners, as shown. Which arrangement will give maximum optical power ?

A

B

C

D

Solution

Focal length is minimum in case I,therefore power is maximum. (P=(1/f))
Question 8
4 / -1

A ray of light is incident at an angle of incidence 45º on an equilateral prism and emerge at an angle 45º then the refractive index of the medium of the prism is :

A
2

B
(sqrt{2})

C
(1over sqrt{2})

D
( sqrt{3})

Solution
Question 9
4 / -1

The distance of nth bright fringe to the (n+1)th dark fringe in Young's experiment is equal to:

A

B

C

D

Solution

The distance between nth bright fringe and (n+1)th dark fringe is equal to half of fringe width =
Question 10
4 / -1

In a Young's double slit experiment, d = 1 mm, λ = 6000 Å and D = 1 m (where d, λ and D have usual meaning). Each of slit individually produces same intensity on the screen. The minimum distance between two points on the screen having 75 % intensity of the maximum intensity is :

A
0.45 mm

B
0.40 mm

C
0.30 mm

D
0.20mm

Solution