NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1351 - 1354 of 2184

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Question number: 1351

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

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MCQ▾

Question

The first diffraction minima due to a single slit diffraction is at θ = 30° for a light of wavelength 5000 Å. The width of the slit is-

Choices

Choice (4) Response

a.

2.5 × 10 -5 cm

b.

5 × 10 -5 cm

c.

1.0 × 10 -5 cm

d.

1.25 × 10 -5 cm

Question number: 1352

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

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MCQ▾

Question

A diffraction pattern is produced by a single slit of width 0.5mm with the help of a convex lens of focal length 40cm. If the wavelength of light used is 5896A. Then the distance of first dark fringe from the axis will be

Choices

Choice (4) Response

a.

0.047 mm

b.

0.047 cm

c.

0.047 m

d.

47 cm

Question number: 1353

» Properties of Solids & Liquids » Heat Transfer » Convection

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MCQ▾

Question

The rate of loss of heat from a body cooling under conditions of forced convection is proportional to its

(1) Surface area

(2) Excess of temperature over that of surrounding

(3) Heat capacity

(4) Absolute temperature

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1,2 and 3 are correct

Question number: 1354

» Wave Optics » Young's Double Slit Experiment

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MCQ▾

Question

In Young’s double slit experiment, carried out with light of wavelength λ = 5000 Å, the distance between the slits is 0.2 mm and the screen is at 200 cm from the slits, The central maximum is at x = 0. The third maximum will be at

Choices

Choice (4) Response

a.

1.67 cm

b.

0.5 cm

c.

5.0 cm

d.

1.5 cm