Physics | NEET Entrance Exam | Under Graduate Entrance Exams Online Objective Test

Under Graduate Entrance Exams NEET Entrance Exam # Physics Work Energy and Power Prepare / Learn

Q1. Physically, the notion of potential energy is applicable only to

A. The class of forces where work done against the force gets converted to thermal energy

B. The class of forces where work done against the force gets stored up as energy.

C. The class of forces where work done against the force gets converted to kinetic energy

D. The class of forces where work done against the force gets dissipated

Answer : Option B
Explaination / Solution:

Potential energy is the stored energy of an object. It is the energy by virtue of an object's position relative to other objects. Potential energy is often associated with restoring forces such as a spring or the force of gravity. It is applicable only for conservative forces.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Communication Systems Prepare / Learn

Q2. In Analog type signals

A. the signal value is available every 1 second

B. the value of the signal varies continuously with time

C. the voltages are fixed at 0 and 5 V

D. the voltages are fixed at -5 V and 5 V

Answer : Option B
Explaination / Solution:

A signal in which current or voltage varies with time is called analog signal.A vibrating fork produces such a sound signal of single frequency.Every speech or music is a complex signal formed by the superposition of several sinusoidal signals of different amplitudes and frequencies.

Under Graduate Entrance Exams NEET Entrance Exam # Physics System of Particles and Rotational Motion Prepare / Learn

Q3. Angular acceleration vector is defined as

A. α=d3ωdt3

B. α=2dωdt

C. α=d2ωdt2

D. α=dωdt

Answer : Option D
Explaination / Solution:

As per the definition of angular accerlation that " it is the time rate of change of angular velocity" , therefore

α = \frac{d ω}{d t}

Under Graduate Entrance Exams NEET Entrance Exam # Physics Motion in A Plane Prepare / Learn

Q4. An arbitrary vector v can be expressed as

A. a sum of three mutually perpendicular unit vectors each multiplied by the same scalar constant

B. a sum of three mutually perpendicular unit vectors each multiplied by a some scalar constant

C. a sum of three mutually perpendicular unit vectors each multiplied scalar constant equal to 1

D. a sum of three mutually perpendicular unit vectors each multiplied scalar constant equal to -1

Answer : Option B
Explaination / Solution:

Set of elements (vectors) in a vector space is called a basis, or a set of basis vectors, if the vectors are linearly independent and every vector in the vector space is a linear combination of this set.In more general terms, a basis is a linearly independent spanning set.

Given a basis of a vector space, every element of vector space can be expressed uniquely as a linear combination of basis vectors, whose coefficients are referred to as vector coordinates or components.

We can represent vector v as

$\vec{v} = x \hat{i} + y \hat{j} + z \hat{k}$

Under Graduate Entrance Exams NEET Entrance Exam # Physics Electric Charges and Fields Prepare / Learn

Q5. For charges

q_{1} a n d q_{2}

separated by a distance R the magnitude of the electrostatic force is given by

A.
F=q14πϵ0R2

B. F=q q2q21 4πϵ0R3

C.
F=q1q24πϵ0R

D. F=q q2q21 4πϵ0R2

Answer : Option D
Explaination / Solution:

According to Coulomb’s law the force between two point charges is

(a) The force is directly proportional to the product of magnitude of charges i.e. $F \propto | q_{1} | | q_{2} |$

(b) The force is inversly proportional to the square of distance between two charges i.e. $F \propto \frac{1}{r^{2}} (I n v e r s e s q u a r e l a w)$

Combining both

$F \propto \frac{| q_{1} | | q_{2} |}{r^{2}} . . . . . . (i)$

$F = k \frac{| q_{1} | | q_{2} |}{r^{2}}$

Where k is a constant of proportionality known as force constant having different value in different systems

Under Graduate Entrance Exams NEET Entrance Exam # Physics Mechanical Properties of Solids Prepare / Learn

Q6. With reference to figure the plastic zone is

A. CD

B. BC

C. AB

D. OA

Answer : Option A
Explaination / Solution:
No Explaination.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Thermodynamics Prepare / Learn

Q7. If

C_{p}

and

C_{v}

are molar specific heat capacities of an ideal gas at constant pressure and volume respectively and R is the universal gas constant, relation between the three is

C_{p}

C_{v}

= 2R

C_{p}

C_{v}

= R

C_{p}

C_{v}

= 2R

C_{p}

C_{v}

= R

Answer : Option D
Explaination / Solution:

This is Meyer's Equation

At constant volume as there is no work done on the gas(ΔV=0) all the heat supplied goes for the increase of internal energy. Hence temperature of body increases with less supply of heat. Whereas at constant pressure heat supplied accounts for both internal energy and work done on the gas.

if we increase temp. of 1 mole of gas by 1K or 1C then

$\begin{aligned} P Δ V = n R Δ T \\ n = 1 m o l e \\ Δ T = 1^{\circ} C \\ P Δ V = R \\ W = P Δ V \\ C_{P} > C_{V} \\ C_{P} - C_{V} = W \\ C_{P} - C_{V} = R \end{aligned}$

This is also called Meyer's formula.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Atoms Prepare / Learn

Q8. Absorption line spectrum is obtained

A. If we pass white (continuous-spectrum) light through a hot gas

B. If we pass white (continuous-spectrum) light through a cool gas

C. If we pass off-white (discrete-spectrum) light through a cool gas

D. If we pass off-white (discrete-spectrum) light through a hot gas

Answer : Option B
Explaination / Solution:
No Explaination.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Physical World Prepare / Learn

Q9. The microscopic domain of physics deals with

A. the constitution and structure of matter at the scales of stars and planets and their interaction with different elementary particles

B. None of these

C. The constitution and structure of matter at the scales of atoms and nuclei and their interaction with different elementary particles

D. the constitution and structure of matter at the scales of atoms and nuclei and their interaction with different bodies on the earth

Answer : Option C
Explaination / Solution:

Microscopic domain includes atomic,molecular and nuclear phenomena. It can be said as the study of matter.It includes the study of structure and configuration of atom,nucleus and the constitute particles of atom-electron,proton,neutron and interaction with elementary particles like electron,photon etc.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Laws of Motion Prepare / Learn

Q10. Newton’s third law states that

A. they exert forces on each other that at each instant are equal in magnitude and same in direction

B. they exert forces on each other that at some instants are equal in magnitude and opposite in direction

C. they exert forces on each other that at some instants are equal in magnitude and same in direction

D. they exert forces on each other that at each instant are equal in magnitude and opposite in direction

Answer : Option D
Explaination / Solution:

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body. According to Newton's law for every action there is always opposit and equal reaction or the mutual actions of two bodies upon each other are always equal and opposite in direction.

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