NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1246 - 1250 of 2184

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Question number: 1246

» Dual Nature of Matter and Radiation » De-Broglie Relation

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MCQ▾

Question

A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. Find the value of v. (Mass of hydrogen atom = 1.67 × 10 -27 kg)

Choices

Choice (4) Response

a.

3.5 m/s

b.

3.05 m/s

c.

32.5 m/s

d.

3.25 m/s

Question number: 1247

» Properties of Solids & Liquids » Application of Surface Tension

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Assertion-Reason▾

Question

Assertion (Ꭺ)

A large soap bubble expands while a small bubble shrinks, when they are connected to each other by capillary tube.

Reason (Ꭱ)

The excess pressure inside bubble (or drop) is inversely proportional to the radius.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

Question number: 1248

» Properties of Solids & Liquids » Terminal Velocity

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MCQ▾

Question

Water is filled in a cylindrical container to a height of 3m. The ratio of the cross-sectional area of the orifice and the beaker is 0.2. The square of the speed of the liquid coming out from the orifice at height 0.525 is, (g = 10m/s 2)

Choices

Choice (4) Response

a.

51.56 m 2 /s 2

b.

52.43. m 2 /r

c.

50.55 m 2 /s 2

d.

50.64 m 2 /s 2

Question number: 1249

» Properties of Solids & Liquids » Elastic Behavior

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MCQ▾

Question

A brass rod is to support a load of 400 N. If its elastic limit is 4.0 × l0 8 N/m 2 its minimum diameter must be -

Choices

Choice (4) Response

a.

1.13mm

b.

4.52mm

c.

3.71mm

d.

2.26mm

Question number: 1250

» Wave Optics » Young's Double Slit Experiment

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MCQ▾

Question

In an experiment similar to Young’s experiment, interference is observed using waves associated with electrons. The electrons are being produced in an electron gun. In order to decrease the fringe width,

(1) Electron gun voltage be increased.

(2) The slits be moved away from each other

(3) The screen be moved closer to interfering slits.

(4) Electron gun voltage be decreased.

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

Codes:

Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct