NEST (National Entrance Screening Test) Physics: Questions 10 - 12 of 58

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Question number: 10

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

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Appeared in Year: 2008

MCQ▾

Question

A free particle with initial kinetic energy and de Broglie wavelength enters a region in which it has potential energy . The particle’s new de Broglie wavelength is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 11

» Current Electricity » Temperature Dependence of Resistance

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Appeared in Year: 2013

MCQ▾

Question

A cylindrical steel rod of length and thermal conductivity is welded end to end to a copper rod of thermal conductivity and of the same area of cross section but long. One end of the copper rod is maintained at . The free end of the steel rod is maintained at a temperature of . Assuming that the rods are perfectly insulated, the temperature of the junction is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 12

» Ray Optics » Lens Formula

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Appeared in Year: 2007

MCQ▾

Question

An illuminated object is fixed at one end of an optical bench of length and a screen is fixed at the other end of the bench. A convex lens is to be used to obtain the image of the object on the screen. The maximum value of the focal length of the lens that can be used (without changing the object and screen positions) for the purpose is:

Choices

Choice (4) Response

a.

b.

c.

d.