NEET Physics: Questions 1183 - 1186 of 2099

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Question number: 1183

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

The Young’s modulus of steel is 2 × 10 11 N/m 2 and its coefficient of linear expansion is 1.1 × 10 -5 per degree. The pressure to be applied to the ends of a steel cylinder to keep its length constant on raising its temperature by 80°C, will be -

Choices

Choice (4) Response
a.

2.2 × 10 8 N/m 2

b.

5.5 × 10 4 N/m 2

c.

1.8 × 10 6 N/m 2

d.

1.76 × 10 8 N /m 2

Question number: 1184

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

Ratio of the wavelengths of first line of Lyman series and first line of Balmer series is

Choices

Choice (4) Response
a.

4: 9

b.

5: 27

c.

1: 3

d.

27: 5

Question number: 1185

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

MCQ▾

Question

Ultraviolet light of wavelength 280 nm is used in an experiment on photo electric effect with lithium (Φ = 2.5 eV) cathode.

(1) The maximum kinetic energy is 1.9 eV

(2) The stopping potential is 1.9 V

(3) The maximum kinetic energy is 4.4 V

(4) The stopping potential is 4.4 eV

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

Choices

Choice (4) Response
a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

Question number: 1186

» Wave Optics » Brewster's Law

MCQ▾

Question

When light of a certain wavelength is incident on a plane surface of a material at a glancing angle 30°, the reflected light is found to be completely plane polarized. Determine refractive index of given material –

Choices

Choice (4) Response
a.

3

b.

2

c.

12

d.

2

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