NEST (National Entrance Screening Test) Physics: Questions 20 - 23 of 58

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Question number: 20

» Physics and Measurement » Errors in Measurement

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Appeared in Year: 2013

MCQ▾

Question

The mean momentum of a particle has uncertainty . Taking Planck’s constant to be , the uncertainty in the de Broglie wavelength of the particle is –

Choices

Choice (4) Response

a.

b.

c.

0

d.

Question number: 21

» Atoms and Nuclei » Half Life and Mean Life

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Appeared in Year: 2009

MCQ▾

Question

A radioactive source, having a half – life of five minutes, was found to have a counting rate of at a certain point in time. Fifteen minutes after this observation, the counting rate is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 22

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

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Appeared in Year: 2009

MCQ▾

Question

Two identical circular current carrying coils and , each of radius are placed adjacently a distance apart . They carry equal currents in opposite sense. Let denote the self and mutual inductances.

Two identical circular current carrying coils

Two Identical Circular Current Carrying Coils

In figure two identical circular current carrying coils 1 and 2, each of radius R are placed adjacently a distance d apart.

Which of the following is at least approximately true?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 23

» Physics and Measurement » Dimensional Analysis and Its Applications

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Appeared in Year: 2013

MCQ▾

Question

Consider the following pairs of quantities:

(i) Coefficient of friction and relative permittivity

(ii) Breakdown voltage in lightning discharge and electric potential

(iii) Torque and kinetic energy

(iv) Light year and time period of simple harmonic motion

Which of the above pairs of quantities have the same dimensions?

Choices

Choice (4) Response

a.

(ii) and (iii) only

b.

(i), (ii), (iii) and (iv)

c.

(i), (ii) and (iii) only

d.

(i) and (iii)