NEST (National Entrance Screening Test) Physics: Questions 53 - 57 of 58

Access detailed explanations (illustrated with images and videos) to 58 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. Subscription can be renewed yearly absolutely FREE! View Sample Explanation or View Features.

Rs. 100.00 or

How to register?

Question number: 53

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

Edit

Appeared in Year: 2019

Essay Question▾

Describe in Detail

A particle of mass moving in one – dimension satisfies the modified Schrodinger equation

Where is the velocity of the substrate. If now this particle is treated as Gaussian wave packet peaked at wave number , its group velocity will be

Explanation

Given

Treating it as a plane wave solution

Replacing and

… (96 more words) …

Question number: 54

» Electronic Devices » Logic Gates (Or, and, NOT, NAND and Nor)

Edit

Appeared in Year: 2019

Essay Question▾

Describe in Detail

The circuit shown below uses only NAND gates: - The final output –

Image shows The circuit shown below uses only NAND gates

Image Shows the Circuit Shown below Uses Only NAND Gates

Image shows The circuit shown below uses only NAND gates

Explanation

output is XOR

… (53 more words) …

Question number: 55

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

Edit

Appeared in Year: 2019

Essay Question▾

Describe in Detail

An ideal gas engine is run according to the cycle shown in the diagram below, where the process from to is known to be isochoric (i. e. maintaining constant).

Image shows The corresponding cycle

Image Shows the Corresponding Cycle

Image shows The corresponding cycle

Explanation

Since is isothermal process, and entropy is decreasing, so volume also decreases.

This condition can be checked from option for .

In process to , volume is constant (isochoric) so pressure temperature. Here temperature is decreasing in , so pressure also decreases from

… (29 more words) …

Question number: 56

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

Edit

Appeared in Year: 2019

Essay Question▾

Describe in Detail

Consider the surface defined by , where and are constants. If and are unit normal vectors to the surface at the points and respectively, and is a unit vector normal to both and , then

Explanation

Normal vector to the surface: -

… (145 more words) …

Question number: 57

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

Edit

Appeared in Year: 2019

Essay Question▾

Describe in Detail

Consider a thermal ensemble at temperature which is composed of identiced quantum harmonic oscillator of frequency with non – overlapping wave function, the probability that there will be an even number of energy in the system is

Explanation

Probability

For even energy quanta

Otherwise

… (176 more words) …