NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1188 - 1191 of 2320

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Question number: 1188

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

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MCQ▾

Question

From rest an electron is accelerated between two such points which has potential 20 & 40 volts respectively. Associated de-Broglie wavelength of electron is-

Choices

Choice (4)Response

a.

7.5 Å

b.

2.75 Å

c.

0.75 Å

d.

2.75 m

Question number: 1189

» Properties of Solids & Liquids » Heat Transfer » Conduction

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MCQ▾

Question

A solid copper sphere (density ρ and specific heat capacity c) of radius r at an initial temperature 200 K is suspends inside a chamber whose walls are at almost 0 K. The time required (in µ s) for the temperature of the sphere to drop to 100 K is

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1190

» Properties of Solids & Liquids » Thermal Expansion

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MCQ▾

Question

The coefficient of volumetric expansion of mercury is 18 × 10 -5 / o C. A thermometer bulb has a volume 10 -6 m 3 and cross section of stem is 0.006 cm 2. Assuming that bulb is filled with mercury at 0°C then the length of the mercury column at 100°C is

Choices

Choice (4)Response

a.

7.4 m

b.

4.5 cm

c.

0.03 m

d.

9.2 mm

Question number: 1191

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

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MCQ▾

Question

When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be 1.5 × 10 4 Joule. During this process about

Choices

Choice (4)Response

a.

3.6 × 10 3 cal of heat flowed out from the gas

b.

1.5 × 10 4 cal of heat flowed out from the gas

c.

3.6 × 10 3 cal of heat flowed into the gas

d.

1.5 × 10 4 cal of heat flowed into the gas

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