Physics Test 97

Result

Physics Test 97

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Weekly Quiz Competition

Question 1
4 / -1

What should the width of each slit be to obtain 20 maxima of the double slit pattern within the central maximum of the single slit pattern ? (Distance between both slit = 2 mm)

A
0.1 mm

B
0.2 mm

C
0.8 mm

D
0.4 mm

Solution
Question 2
4 / -1

For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm ?

A
9 m

B
12 m

C
15 m

D
18 m

Solution
Question 3
4 / -1

In double slit experiment using light of wavelength 600 nm the angular width of a fringe formed on a distance screen is 0.1 degree. Find distance between both slits ?

A
0.20 mm

B
0.24 mm

C
0.34 mm

D
0.40 mm

Solution
Question 4
4 / -1

Ratio of intensities of two light waves is given by 4 : 1. The ratio amplitudes of the waves is :-

A
2 : 1

B
1 : 2

C
4 : 1

D
1 : 4

Solution
Question 5
4 / -1

In Y.D.S.E. λ = 4000 Å is used and fringes are formed at 2 m distance and has a fringe width of 0.6 mm. If whole of the experiment is performed in a liquid of refractive index 1.5 then width of the fringe will be

A
0.2 mm

B
0.3 mm

C
0.4 mm

D
1.2 mm

Solution
Question 6
4 / -1

The slits in a Y.D.S.E. have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringe is I₀/4. If one of the slits is closed, the intensity at this point will be :

A
I₀

B
I₀/4

C
I₀/16

D
I₀/32

Solution
Question 7
4 / -1

Colours of thin films results from :-

A
Dispersion of light

B
Interference of light

C
Absorption of light

D
Scattering of light
Question 8
4 / -1

Ray diverging from a point source form a wave front that is

A
Cylindrical

B
Spherical

C
Plane

D
None
Question 9
4 / -1

In Y.D.S.E. max intensity is I then the position where the intensity becomes I/4 is :-

A
sin^–1(λ/d)

B
sin^–1(λ/3d)

C
sin^–1(λ/2d)

D
sin^–1(λ/4d)

Solution

I/4 = I cos²(ϕ/2) ⇒ f = 120^o = 2π/3

Δx = λ/3

d sinθ = λ/3

sin θ = λ/3d ⇒ θ = sin^–1(λ/3d)
Question 10
4 / -1

In single slit diffraction pattern :-

A
Central fringe has negligible width than other

B
All fringes are of same width

C
Central fringe does not exist

D
None