NEET Physics: Questions 1427 - 1430 of 2098

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Question number: 1427

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A wire of cross sectional area 3 mm 2 is just stretched between two fixed points at a temperature of 20° C. Determine the tension when the temperature falls to 20° C. Coefficient of linear expansion a = 10 -5 °C -1 and Y = 2 × 10 11 N/m 2.

Choices

Choice (4) Response

a.

120 N

b.

102 N

c.

20 N

d.

120 KN

Question number: 1428

» Properties of Solids & Liquids » Surface Energy and Surface Tension

MCQ▾

Question

The radii of two soap bubbles are r 1 and r 2. In isothermal conditions, two meet together in vacuum. Then the radius R of the resultant bubble is given by

Choices

Choice (4) Response

a.

R=r1+r2

b.

R=r1+r22

c.

R2=r12+r22

d.

R=r1(r1r2+r2)

Question number: 1429

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is

Choices

Choice (4) Response

a.

122.4

b.

40.8

c.

1.51

d.

13.6

Question number: 1430

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

MCQ▾

Question

One mole of an ideal monatomic gas is taken from A to C along the path ABC. The temperature of the gas at A is T 0. For the process ABC –

System of gas molecule – path ABC

System of Gas Molecule – Path ABC

In above figure we show that one mole of an ideal monatomic gas is taken from A to C along the path ABC

(1) Work done by the gas is RT0

(2) Change in internal energy of the gas is 112RT0

(3) Heat absorbed by the gas is 112RT0

(4) Heat absorbed by the gas is 132RT0

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 2 ate correct

c.

1, 2 and 3 are correct

d.

1 and 3 are correct

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