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

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

Q1. Which of the following is a possible final step in applying the scientific method

A. Building a theory

B. Formulation of a question

C. Analysis of test results

D. Formulating a hypothesis

Answer : Option C
Explaination / Solution:

Your experiment tests whether your prediction is accurate and thus your hypothesis is supported or not. It is important for your experiment to be a fair test. You conduct a fair test by making sure that you change only one factor at a time while keeping all other conditions the same. You should also repeat your experiments several times to make sure that the first results weren't just an accident.

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

Q2. The change in kinetic energy of a particle is equal to the

A. work done on it by the net force

B. loss in ambient kinetic energy

C. work done on it by the aerodynamic force

D. work done on it by some force

Answer : Option A
Explaination / Solution:

if a body of mass m move with velocity u under the action of force F. Its velocity become v after displaced by s. then v2=u2+2as v2−u2=2as mv2−mu2=2mas 12mv2−12mu2=Fs Kf−Ki=W ΔK=W

$\begin{aligned} v^{2} = u^{2} + 2 a s \\ v^{2} - u^{2} = 2 a s \\ m v^{2} - m u^{2} = 2 m a s \\ \frac{1}{2} m v^{2} - \frac{1}{2} m u^{2} = F s \\ K_{f} - K_{i} = W \\ Δ K = W \end{aligned}$

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

Q3. Which of these is an example of broadcast communication?

A. FAX

B. Telephony

C. Radio

D. Mobile

Answer : Option C
Explaination / Solution:

In broadcast mode of communication a large number of receivers are linked to a single transmiiter.Radio works as receiver which converts the transmiited information/message into the original form of the information.

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

Q4.

Multiplying a vector $\vec{v}$ by a positive real number $λ$

A. gives a scalar that is

λ

times the magnitude of

\vec{v}

B. gives a vector

\vec{v^{'}}

λ \vec{v}

in a direction opposite to

\vec{v}

C. gives a scalar that is

λ

times the polar angle of

\vec{v}

D. gives a vector

\vec{v^{'}}

λ \vec{v}

in the same direction as

\vec{v}

Answer : Option D
Explaination / Solution:

When a vector is multiplied by a positive number (for example 2, 3 ,5, 60 unit etc.) or a scalar only its magnitude is changed but its direction remains the same as that of the original vector.

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

Q5. Conservation of charges in tribo electric charging

A. implies half are positively charged and other half are neutral

B. implies one is positively charged and the other is negatively charged.

C. implies both are positively charged

D. implies both are negatively charged

Answer : Option B
Explaination / Solution:

The triboelectric effect (also known as triboelectric charging) is a type of contact electrification in which certain materials become electrically charged after they come into frictional contact with a different material. Rubbing glass with fur, or a plastic comb through the hair, can build up triboelectricity.

When we charge something with static electricity, no electrons are made or destroyed. No new protons appear or disappear. Electrons are just moved from one place to another. The net, or total, electric charge stays the same. This is called the principle of conservation of charge.

If a glass rod is rubbed with silk, some electrons moves from glass rod to silk no new charge is generated or destroyed.

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

Q6. Stress is

A. force per unit length

B. force per unit area

C. total applied force

D. three point average of forces

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q7. Diathermic wall is

A. a thermally conducting wall that does not allow flow of heat from one body to another

B. a thermally insulating wall that does not allow flow of heat from one body to many

C. a thermally conducting wall that allows flow of heat from one body to another

D. a thermally insulating wall that allows flow of heat from one body to another

Answer : Option C
Explaination / Solution:

A wall which prevents thermal interaction is known as adiabatic wall and a system enclosed within an adiabatic wall is called thermally isolated. If exchange of heat takes place between the system and surroundings through the boundary wall, the boundary is called diathermic wall.

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

Q8. In Geiger-Marsden experiment prediction was that

A. All the particles would go through the foil with hardly any deflection

B. some particles would be expected at 75

^{\circ}

C. All the particles would bounce from the foil at 180

^{\circ}

D. some particles would be expected at 45

^{\circ}

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q9. According to Newton's second law of motion

A. The momentum of a body is directly proportional to the applied force and takes place in the direction opposite to the force

B. The rate of change of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts

C. The momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts

D. The intergration of momentum of a body is directly proportional to the applied force and takes place in the direction in which the force acts

Answer : Option B
Explaination / Solution:

If mass does not change then acceleration of a particle is dependent on the forces acting upon the particle and the particle's mass. For a given particle, if the net force is increased, the acceleration is increased. For a given net force, the more mass a particle has, the less acceleration it has.

$F = m a = m \frac{d v}{d t} = \frac{d (m v)}{d t} = \frac{d p}{d t} .$

hence the rate of change of momentum of a body is directly proportional to the applied force

Under Graduate Entrance Exams NEET Entrance Exam # Physics Alternating Current Prepare / Learn

Q10. If

I_{m}

is the maximum current, then the average value of power dissipated in a resistance R over a cycle is

A. 32I2mR

B. 12I2mR

C. I2mR

D. 2I2mR

Answer : Option B
Explaination / Solution:

As in the case with DC power, the instantaneous electric power in an AC circuit is given by P = VI, but these quantities are continuously varying. So the average power is given by

Pavg = VI cosφ

where φ is the phase angle between the current and the voltage and where V and I are understood to be the effective or rms values of the voltage and current.

Now RMS value of I is = $\frac{I_{m}}{\sqrt{2}}$

So, RMS value of V= $\frac{I_{m} R}{\sqrt{2}}$

Therefore, Power will be

P= $\frac{1}{2} I_{m}^{2} R$ (because cosφ= 1 for circuit containing resistance only)

Physics - Online Test

Physics | Online Objective Test | Start Test

Prepare Before Start Test | Learn

UPSC Civil services Entrance exams | Online Test

GATE Exam | Online Test

Under Graduate Entrance Exams | Online Test

Problem Solving and Reasoning | Online Test

CAT Entrance Exams | Online Test

CLAT LAW Entrance exams | Online Test

Banking Entrance exams | Online Test

UGC NET Entrance exams | Online Test

TANCET Anna University | Online Test

TN State Board | Online Test