NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1380 - 1385 of 2142

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Question number: 1380

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

MCQ▾

Question

Two soap bubbles of radii r 1 and r 2 equal to 8 cm and 9 cm are touching each other over a common surface S 1 S 2. Its radius will be

Choices

Choice (4) Response

a.

45 cm

b.

58 cm

c.

20 cm

d.

72 cm

Question number: 1381

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A brass rod is to support a load of 500 N. If its elastic limit is 5.0 × l0 8 N/m 2 its minimum diameter must be -

Choices

Choice (4) Response

a.

3.71mm

b.

1.13mm

c.

1.26mm

d.

2.26mm

Question number: 1382

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

MCQ▾

Question

The de-Broglie wavelength of an electron is 0.2 Å. Calculate the potential difference (approximate) required to retard it to rest-

Choices

Choice (4) Response

a.

3.76 × 10 3 V

b.

3.76 × l0 -3 V

c.

376.5 V

d.

3.76 × 10 3 eV

Question number: 1383

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Consider two hot bodies B 1 and B 2 which have temperature 100° C and 60° C respectively at t = 0. The temperature of surroundings is 50° C. The ratio of the respective rates of cooling R 1 and R 2 of these two bodies at t = 0 will be

Choices

Choice (4) Response

a.

R 1: R 2 = 4: 5

b.

R 1: R 2 = 3: 2

c.

R 1: R 2 = 2: 3

d.

R 1: R 2 = 5: 1

Question number: 1384

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is

Choices

Choice (4) Response

a.

27: 5

b.

5: 27

c.

4: 1

d.

1: 4

Question number: 1385

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

Question

An iron tire is to be fitted on to a wooden wheel 2 m in diameter. The diameter of tire is 4mm smaller than that of wheel. The tire should be heated so that its temperature increases by a minimum of (The coefficient of cubical expansion of iron is 3.6 ×10 -5 /°C)

Choices

Choice (4) Response

a.

1000°C

b.

500°C

c.

167°C

d.

334°C

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