Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 71 - 75 of 190

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Question number: 71

» Properties of Solids & Liquids » Temperature

Assertion-Reason▾

Question

Assertion (Ꭺ)

Fahrenheit is the smallest unit measuring temperature.

Reason (Ꭱ)

Fahrenheit was the first temperature scale used for measuring temperature.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

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

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Question number: 72

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A black body is at a temperature of 2880 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U 1 between 999 nm and 1000 nm is U 2 and between 1499 nm and 1500 nm is U 3. The Wein’s constant b = 2.88 x 10 6 nm K. Then

Choices

Choice (4) Response

a.

b.

c.

U 1 > U 2

d.

U 2 > U 1

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Question number: 73

» Properties of Solids & Liquids » Newton's Law of Cooling

MCQ▾

Question

A body initially at 90° C cools to 60° C in 5 minutes and to 50° C in 10 minutes. The temperature of the body after 15 minutes will be

Choices

Choice (4) Response

a.

39.65° C

b.

48.70° C

c.

42.7° C

d.

45° C

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Question number: 74

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

The work done in increasing the length of a one meter long wire of cross-sectional area 1mm 2 through 1mm will be

(Y = 2 × 10 11 N/m 2)

Choices

Choice (4) Response

a.

250 J

b.

5 J

c.

10 J

d.

0.1 J

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Question number: 75

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A body cools from 60° C to 50° C in 10 minutes. If the room temperature is 25° C and assuming Newton ‘s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be

Choices

Choice (4) Response

a.

42.85° C

b.

40° C

c.

45° C

d.

38.5° C

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