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

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

Q1. Noise in electronic communication refers to

A. Noise produced by sound

B. signals that are amplified for performance

C. Noise produced by whistles

D. unwanted signals that are mixed up with messages

Answer : Option D
Explaination / Solution:

In communication systems, noise is an error or undesired random disturbance of a useful information signal. The noise is a summation of unwanted or disturbing energy from natural and sometimes man-made sources.Consequently,a distored or corrupted version of the transmitted signal reaches the receiver.

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

Q2. The total mechanical energy of a system is conserved if the

A. forces, doing work on it, are conservative

B. forces, doing work on it, are damped

C. forces, doing work on it, are viscous

D. forces, doing work on it, are not conservative

Answer : Option A
Explaination / Solution:

Mechanical energy is the sum of kinetic and potential energy in an object that is used to do work. In other words, it is energy in an object due to its motion or position, or both. In case of conservative forces total mechanical energy remains conserved because potential energy applicable only for conservative forces.

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

Q3.

An arbitrary vector $\vec{A}$ in a plane can be expressed in terms of its x and y components by the equation

A. A⃗ =Axi^+Ayj

\vec{A} = A_{x} + A_{y}

\vec{A} = A_{x} \hat{i} - A_{y} \hat{j}

C. A⃗ =Axi^−Ayj

D. A⃗ =Ax−Ay

Answer : Option A
Explaination / Solution:

In a two-dimensional coordinate system, any vector can be broken into x -component and y -component.

Vector $\vec{A}$ can be represented as

$\vec{A} = A_{x} \hat{i} + A_{y} \hat{j}$

Where $A_{x}$ is component in direction of x-axis and $\hat{i}$ is a unit vector in same direction of x-axis

And $A_{y}$ is component in direction of y-axis and $\hat{j}$ is a unit vector in same direction of y-axis

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

Q4. The angular momentum L of the particle having a position vector r and linear momentum p, with respect to the origin O is defined to be

A. L⃗ =r⃗ ×p⃗

L = \vec{r} \times \vec{p} \times \vec{r}

\vec{L} = \vec{r} \times \vec{p} . \vec{ω}

C. L⃗ =r⃗ ×p⃗ .ω⃗

D. L⃗ =r⃗ ×r⃗ ×p⃗

Answer : Option A
Explaination / Solution:

Angular momentum is also referred as moment of linear momentum

The angular momentum L of a particle of mass m with respect to a chosen origin is given by

$\vec{L} = \vec{r} \times \vec{p}$

Direction of angular momentum is according to right hand rule.

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

Q5. Electric field at a point is defined as

A. electric force experienced by a dipole at that point

B. electric force per unit charge experienced by a unit charge at that point

C. electric force experienced by a charge at that point

D. electric force experienced by two charges at that point

Answer : Option B
Explaination / Solution:

Electric field intensity of a charge at a point is given by the force exerted by that charge on test charge or unit charge at that point
That is The electric field intensity of charge q is $E = \frac{F}{q_{0}}$

$I n v e c t o r f o r m \vec{E} = \frac{\vec{F}}{q_{0}}$

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

Q6. With reference to figure the yield strength point corresponds to

A. B

B. C

C. D

D. A

Answer : Option A
Explaination / Solution:

Yield point is point on the curve where the body deforms with negligible amount of stress. Hence it should be B

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

Q7. In case of isobaric process the volume of an ideal gas change the work done by the gas is given by

A. P / ΔV

B. P + ΔV

C. P ΔV

D. P - ΔV

Answer : Option C
Explaination / Solution:

$\begin{aligned} d W = F . d y = P A . d y = P . d V \\ W = \int_{V_{1}}^{V_{2}} P . d V \end{aligned}$

$W = P (V_{2} - V_{1}) = P Δ V$

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

Q8. Emission line spectra of different elements

A. is the same if both elements are in liquid form

B. is the same if both elements are at the same temperature

C. is different

D. is not different

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q9. What is central to the growth of physics?

A. Conjectural descriptions

B. Qualitative descriptions

C. Speculative descriptions

D. Quantitative measurement

Answer : Option D
Explaination / Solution:

Quantitative measurement is central to the growth of physics because Laws of nature happen to be expressible in more precise mathematical equations.

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

Q10. According to the law of conservation of momentum,

A. the total momentum of an isolated system of interacting particles is conserved.

B. the total momentum of an interacting system of particles and fields is conserved

C. the momentum of an interacting system of particles and fields is conserved

D. the momentum of an isolated system of interacting particles is conserved

Answer : Option A
Explaination / Solution:

when no external forces acts on a system of several interacting particles, then the total momentum is conserved.

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