NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1246 - 1249 of 2320

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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

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