Properties of Solids & Liquids-Heat Transfer (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 18 - 21 of 40

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Question number: 18

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Three rods of the same dimension have thermal conductivities 4K, 2K and 2K. They are arranged as shown in fig. with their ends at 100°C, 50°C and 20°C. The temperature of their junction is

Three rod of same dimension 4K, 2K and 2K

Three Rod of Same Dimension 4K, 2K and 2K

In above fig show three rod of same dimension having thermal conductivities 4K, 2K and K.

Choices

Choice (4) Response

a.

67.5°C

b.

35.3°C

c.

70.45°C

d.

50.43°C

Question number: 19

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

For cooking the food, which of the following type of utensil is most suitable

Choices

Choice (4) Response

a.

Low specific heat and high conductivity

b.

High specific heat and low conductivity

c.

Low specific heat and low conductivity

d.

High specific heat and high conductivity

Question number: 20

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

Consider two hot bodies B 1 and B 2 which have temperature 100° C and 80° C respectively at t = 0. The temperature of surroundings is 40° C. The ratio of the respective rates of cooling R 1 and R 2 of these two bodies at t = 0 will be,

Choices

Choice (4) Response

a.

R 1: R 2 = 3: 2

b.

R 1: R 2 = 2: 3

c.

R 1: R 2 = 5: 4

d.

R 1: R 2 = 4: 5

Question number: 21

» Properties of Solids & Liquids » Heat Transfer » Radiation

Assertion-Reason▾

Assertion (Ꭺ)

As temperature of a black body is raised, wavelength corresponding to maximum energy reduces.

Reason (Ꭱ)

Higher temperature would mean higher energy and hence higher wavelength.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

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

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