NEST (National Entrance Screening Test-NISER) Physics: Questions 57 - 60 of 354

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Question 57

Appeared in Year: 2012

Question MCQ▾

A radioactive nucleus A has a single decay mode with half-life τA. Another radioactive nucleus B has two decay modes 1 and 2. If decay mode 2 were absent, the half-life of B would have been . If decay mode 1 were absent, the half – life of B would have been . If the actual half – life of B is , then the ratio is –

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Question 58

Appeared in Year: 2011

Question MCQ▾

The Quantum Hall Resistance RH is a fundamental constant with dimensions of resistance. If h is Planck՚s constant and e the electron charge, then the dimension of RH is the same as -

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Question 59

Appeared in Year: 2011

Question MCQ▾

One mole of an ideal gas at initial temperature T, undergoes a quasi-static process during which the volume V is doubled. During the process the internal energy U obeys the equation , where a is a constant. The work done during this process is

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Question 60

Appeared in Year: 2012

Question MCQ▾

In one model of the election, the mass of electron me is thought to be a uniformly charged shell of radius R and total charge e, whose electrostatic energy E is equivalent to its mass me via Einstein՚s mass energy relation E = mec2. In this model, R is approximately – (me = 9.1 × 10-31kg, c = 3 × 108 ms-1, magnitude of the electron charge = 1.6 × 10-19 C)

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