Properties of Solids & Liquids (NEET Physics): Questions 69 - 73 of 188

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Question number: 69

» Properties of Solids & Liquids » Terminal Velocity

MCQ▾

Question

Water is filled in a cylindrical container to a height of 3m. The ratio of the cross-sectional area of the orifice and the beaker is 0.2. The square of the speed of the liquid coming out from the orifice at height 0.525 is, (g = 10m/s 2)

Choices

Choice (4) Response

a.

50.64 m 2 /s 2

b.

52.43. m 2 /r

c.

51.56 m 2 /s 2

d.

50.55 m 2 /s 2

Question number: 70

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A brass rod is to support a load of 400 N. If its elastic limit is 4.0 × l0 8 N/m 2 its minimum diameter must be -

Choices

Choice (4) Response

a.

2.26mm

b.

1.13mm

c.

4.52mm

d.

3.71mm

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.

U1=0

b.

U3=0

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

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