NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1177 - 1181 of 2142

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Question number: 1177

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

The ratio of radii of two wires of same material is 2: 1. If these wires are stretched by equal forces, then the ratio of stresses produced in them will be

Choices

Choice (4) Response

a.

4: 1

b.

1: 2

c.

2: 1

d.

1: 4

Question number: 1178

» Dual Nature of Matter and Radiation » De-Broglie Relation

MCQ▾

Question

In photoelectric effect if intensity of light is doubled then maximum kinetic energy of photoelectrons will become

Choices

Choice (4) Response

a.

Four time

b.

Half

c.

No change

d.

Double

Question number: 1179

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

A cylindrical rod with one end in a steam chamber and it other end in ice results in melting of 0.3 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 Equation that of first, the rate at which ice melts in gm/sec will be

Choices

Choice (4) Response

a.

3.2

b.

0.6

c.

0.1

d.

0.2

Question number: 1180

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

Assertion-Reason▾

Assertion (Ꭺ)

The velocity increases, when water flowing in broader pipe enters a narrow pipe.

Reason (Ꭱ)

According to equation of continuity, product of area and velocity is constant.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is 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

Question number: 1181

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

MCQ▾

Question

Two spectral line of sodium D 1 & D 2 have wavelengths of approximately 5890 Å and 5896 Å. A sodium lamp sends incident plane wave on to a slit of width 2 micrometer. A screen is located at 2 m from the slit. Find the spacing between the first maxima of two sodium lines as measured on the screen.

Choices

Choice (4) Response

a.

9 × 10 4 m

b.

10 -4 m

c.

9 × 10 -4

d.

All of the above

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