NEET Physics: Questions 1443 - 1446 of 2142

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Question number: 1443

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

A cylindrical rod with one end in a steam chamber and its other end in ice results in melting of 0.1 gm of ice per second. If the rod is replaced by another with half the length and double the radius of the first and if the thermal conductivity of material of second rod is ¼ that of firth, the rate at which ice melts in gm/sec will be

Choices

Choice (4) Response

a.

0.1

b.

1.6

c.

0.2

d.

3.2

Question number: 1444

» Thermodynamics » Laws of Thermodynamics » Zeroth Law of Thermodynamics

MCQ▾

Question

One mole of an ideal gas expands at a constant temperature of 200 K from an initial volume of 10 litres to a final volume of 20 litres. The work done in expanding the gas is

(R = 8.31 J/mole-K)

Choices

Choice (4) Response

a.

750 Joules

b.

3456 Joules

c.

1728 Joules

d.

1500 Joules

Question number: 1445

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A spring is stretched by 3 cm when a load of 5.4 × 10 6 dyne is suspended from it. Work done will be

Choices

Choice (4) Response

a.

8.1 × 10 6 erg

b.

8.0 × 10 6 erg

c.

8.1 × 10 6 J

d.

8 × 10 6 J

Question number: 1446

» Properties of Solids & Liquids » Heat Transfer » Conduction

Assertion-Reason▾

Assertion (Ꭺ)

The equivalent thermal conductivity of two plates of same thickness in contact (series) is less than the smaller value of thermal conductivity.

Reason (Ꭱ)

For two plates of equal thickness in contact (series) the equivalent thermal conductivity is given by

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

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