NEET Physics: Questions 1339 - 1344 of 2142

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Question number: 1339

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

MCQ▾

Question

What will be the angle of diffraction for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit width 0.55 mm?

Choices

Choice (4) Response

a.

l rad

b.

0.01 rad

c.

0.1 rad

d.

0.001 rad

Passage

Read the passage given below and answer the questions that follow:

There is a small mercury drop of radius 4.0 mm. A surface P of area 1.0 mm 2 is placed at the top of the drop. Atmospheric pressure = 10 5 Pa. Surface tension of mercury = 0.465 N/m. Gravity effect is negligible.

Question number: 1340 (1 of 2 Based on Passage) Show Passage

» Properties of Solids & Liquids » Application of Surface Tension

MCQ▾

Question

The force exerted by air on surface P is

Choices

Choice (4) Response

a.

0.1 N

b.

1.0N

c.

1.0023 N

d.

10 5 N

Question number: 1341 (2 of 2 Based on Passage) Show Passage

» Properties of Solids & Liquids » Application of Surface Tension

MCQ▾

Question

The force exerted by mercury drop on the surface P is

Choices

Choice (4) Response

a.

1.0023 N

b.

0.00023 N

c.

0.10023 N

d.

0.1 N

Question number: 1342

» Properties of Solids & Liquids » Surface Energy and Surface Tension

MCQ▾

Question

A candle of diameter d is floating on a liquid in a cylindrical container of diameter D (D > > d). If it is burning at the rate of 2 cm/hour then the top of the candle will,

Choices

Choice (4) Response

a.

Fall at the rate of 2 cm/hour

b.

Fall at the rate of 1 cm/hour

c.

Remain at the same height

d.

Go up the rate of 1 cm/hour

Question number: 1343

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

The value of the kinetic energy divided by the total energy of an electron in a Bohr orbit is

Choices

Choice (4) Response

a.

2

b.

-1

c.

0.5

d.

All of the above

Question number: 1344

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

The Young’s modulus of steel is 2 × 10 11 N/m 2 and its coefficient of linear expansion is 1.1 × 10 -5 per deg. The pressure to be applied to the ends of a steel cylinder to keep its length constant on raising its temperature by 100°C, will be -

Choices

Choice (4) Response

a.

1.8 × 10 6 N/m 2

b.

5.5 × 10 4 N/m 2

c.

2.0 × 10 11 N/m 2

d.

2.2 × 10 8 N/m 2

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