NEET Physics: Questions 1314 - 1318 of 2099

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Question number: 1314

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

MCQ▾

Question

Energy of an α-particle, having de-Broglie wavelength of 0.004 Å is approximately.

Choices

Choice (4) Response
a.

1275 eV

b.

1200 KeV

c.

1200 GeV

d.

1200 MeV

Question number: 1315

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

MCQ▾

Question

A beam of electron accelerated through 70 kV strikes against a target. Which one of following

X-ray frequency will be missing?

Choices

Choice (4) Response
a.

16.9×1018Hz

b.

6×108Hz

c.

2×109Hz

d.

12×1018Hz

Question number: 1316

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

A room is maintained at 20°C by a heater of resistance 20 ohm connected to 400 volt mains. The temperature is uniform throughout the room and heat is transmitted through a glass window of area 4 m 2 and thickness 0.2 cm. What will be the temperature outside? Given that thermal conductivity K for glass is 0.2 cal/m/°C/sec and J = 4.2 J/cal

Choices

Choice (4) Response
a.

15.25 °C

b.

15.023 °C

c.

24.15 °C

d. Question does not provide sufficient data or is vague

Question number: 1317

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

Question

Light of wavelength 3320 A is incident on metal surface (work function = 1.07 eV). To stop emission of photo electron, retarding potential required to be

(Take hc = 12420 eV- Å)

Choices

Choice (4) Response
a.

3.74 V

b.

4.81V

c.

2.67 V

d.

1.07 V

Question number: 1318

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

MCQ▾

Question

Which graph represents the variation of surface tension with temperature over small temperature ranges for water?

Choices

Choice (4) Response
a.
Curve of Surface tension → Temparature. choice A.

Curve of Surface Tension → Temparature. Choice a.

Figure shows the graph of Surface Tension vs temperature, which; is not linear.

b.
Curve of Surface tension → Temparature.Choice B

Curve of Surface Tension → Temparature. Choice B

Figure shows the graph of Surface Tension vs temperature, which; is not linear.

c.
Curve of Surface tension → Temparature. Choice C

Curve of Surface Tension → Temparature. Choice C

Figure shows the graph of Surface Tension vs temperature, which; is not linear.

d.
Curve of Surface tension → Temparature. Choice D

Curve of Surface Tension → Temparature. Choice D

Figure shows the graph of Surface Tension vs temperature, which; is not linear.

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