# 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▾

### 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

## 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

## 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

## 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

## 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