NEET Physics: Questions 1395 - 1399 of 2142

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Question number: 1395

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

A steel wire is 4.0 m long and 2 mm in diameter. Young’s modulus of steel is 1.96 x 10 11 N/m 2. If a mass of 20 kg is suspended from it the elongation produced will be -

Choices

Choice (4) Response

a.

0.64 mm

b.

127 mm

c.

2.54 mm

d.

0.27 mm

Question number: 1396

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

In Fresnel’s biprism experiment the width of 10 fringes is 2cm which are formed at a distance of 2 meter from the slit. If the wavelength of light is 5100 Å then the distance between two coherent sources will be,

Choices

Choice (4) Response

a.

5.1 ×10 -4 mm

b.

5.1 ×10 -4 m

c.

5.1 ×10 -4 cm

d.

10.1 ×10 -4 cm

Question number: 1397

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

Fraunhoffer diffraction pattern is observed at a distance of 2m on screen, when a plane-wavefront of 6000A is incident perpendicularly on 0.2 mm wide slit. Width of central maxima is:

Choices

Choice (4) Response

a.

12 mm

b.

6 mm

c.

10 mm

d.

None of the above

Question number: 1398

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

MCQ▾

Question

The pressure in the tire of a car is four times the atmospheric pressure at 200 K. If this tire suddenly bursts, its new temperature will be (γ = 1.4)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 1399

» Properties of Solids & Liquids » Specific Heat Capacity

MCQ▾

Question

A beaker contains 200 gm of water. The heat capacity the beaker is equal to that of 20 gm of water. The initial temperature of water in the beaker is 20°C. If 440 gm hot water at 92°C is poured in it, the final temperature (neglecting radiation loss) will be nearest to

Choices

Choice (4) Response

a.

68°C

b.

73°C

c.

58°C

d.

78°C

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