NEET Physics: Questions 2083 - 2086 of 2098

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Question number: 2083

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

Appeared in Year: 2016

MCQ▾

Question

Electrons of mass m with De – Broglie wavelength λ fall on the target in a X – ray tube. The cutoff wavelength (λ0) of the emitted X – ray is:

Choices

Choice (4) Response

a.

λ0=λ

b.

λ0=2hmc

c.

λ0=2m2c2λ3h2

d.

λ0=2mcλ2h

Question number: 2084

» Current Electricity » Ohm's Law

Appeared in Year: 2016

MCQ▾

Question

A filament bulb (500W,100V) is to be used in a 230V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500W . The value of R is –

Choices

Choice (4) Response

a.

13Ω

b.

230Ω

c.

46Ω

d.

26Ω

Question number: 2085

» Gravitation » Energy

Appeared in Year: 2016

MCQ▾

Question

A satellite of mass m is orbiting the earth (of radius R) at a height h from its surface. The total energy of the satellite in terms of g0 , the value of acceleration due to gravity at the earth’s surface, is –

Choices

Choice (4) Response

a.

2mg0R2R+h

b.

2mg0R2R+h

c.

mg0R22(R+h)

d.

mg0R22(R+h)

Question number: 2086

» Properties of Solids & Liquids » Application of Surface Tension

Appeared in Year: 2016

MCQ▾

Question

Three liquids of densities ρ1,ρ2 and ρ3 (with ρ1>ρ2>ρ3 ), having the same value of surface tension T, rise to the same height in three identical capillaries. The angle of contact θ1,θ2 and θ3 obey –

Choices

Choice (4) Response

a.

π2<θ1>θ2>θ3<π

b.

π2>θ1>θ2>θ30

c.

0θ1<θ2<θ3<π2

d.

π>θ1>θ2>θ3<π2

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