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. In a graph of F(x) vs x, the area under the curve

A. represents the momentum of F(x).

B. represents the impulse of F(x)

C. represents energy of F(x).

D. represents work done by F(x).

Answer : Option D
Explaination / Solution:

Work done by a variable force is given by W = ∫F(x)dx above integration gives us area area under F and x.

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

Q2. Signal in electronic communication refers to

A. large values of electrical voltages like 220 volts

B. small values of the order of micro to milli volts varying with time

C. constant function of time like 3v

D. Very large values of electrical voltages like 5 KV

Answer : Option B
Explaination / Solution:

In communication a signal implies a time varying electrical signal obtained by transforming original signal with the help of a suitable transducer.It is single valued function of time that conveys the information.

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

Q3. If a body is rotating about z axis with a speed ω and a point is at a distance of r in the x-y plane then the velocity of the point is

A. rω/2

B. rω

C. 3rω

D. 3rω

Answer : Option B
Explaination / Solution:

angular displacement of particle about z axis

$d θ = \frac{d s}{r}$

differentiate with respect to time

$\begin{aligned} \frac{d θ}{d t} = \frac{1}{r} \frac{d s}{d t} \\ \frac{d θ}{d t} = ω \\ \frac{d s}{d t} = v \\ ω = \frac{v}{r} \\ v = r ω \end{aligned}$

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

Q4. Null vector or a zero vector has a magnitude

A. less than zero

B. equal to zero

C. that is complex

D. greater than zero

Answer : Option B
Explaination / Solution:

A null vector is a vector having magnitude equal to zero.It is represented by $\vec{0}$ .

A null vector has no direction or it may have any direction.

Generally a null vector is either equal to resultant of two equal vectors acting in opposite directions or multiple vectors in different directions.

$\vec{0} = \vec{A} + (- \vec{A})$

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

Q5. Conductors are materials

A. that allow movement of electrons

B. that allow movement of protons

C. that allow movement of neutrons

D. that allow only random movement of electrons

Answer : Option A
Explaination / Solution:

Conductors are materials that permit electrons to flow freely from particle to particle. An object made of a conducting material will permit charge to be transferred across the entire surface of the object. In conductors some electrons are unpaired so these electrons can move freely.

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

Q6. According to Hooke’s law

A. For small deformations the stress is proportional to square of strain

B. For large deformations the stress and strain are proportional to each other

C. For small deformations the stress and strain are proportional to each other

D. For small deformations the stress and strain are inversely proportional to each other

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q7.

If $Δ$ Q is the energy supplied to the system $Δ$ U the change in internal energy, and $Δ$ W the work done on the environment, First Law of Thermodynamics states that

A. Δ U + ΔW = 0

B. Δ Q = ΔU - ΔW

C. Δ Q = ΔU × ΔW

D. Δ Q = ΔU + ΔW

Answer : Option D
Explaination / Solution:

Heat given to a system is equal to the sum of increase in its internal energy and the work done by the system against the surroundings.

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

Q8. Wave picture of light failed to explain.

A. the photoelectric effect

B. diffraction of light

C. interference of light

D. polarization of light

Answer : Option A
Explaination / Solution:

If light were strictly a wave, the energy in the light would be represented by the amplitude of the light wave. A more intense light source, even if it was light of a lower frequency, would have enough energy to knock electrons away from their molecular orbits, which is necessary to generate a photoelectric current. What actuall occurs is that light below a certain threshold frequency does not generate any current, no matter how intense the light is. Even though the total light energy hitting the photoelectric cell may be high, it cannot free electrons.

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

Q9. Continuous spectrum is produced by

A. lasers

B. Hydrogen atoms in electrical field

C. incandescent lamp

D. Hydrogen atoms in magnetic field

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q10. Impulse is

A. the average of force over a short period

B. the derivative of force over a short period

C. the integral of force over a short period

D. the difference of force over a short period

Answer : Option C
Explaination / Solution:

A resultant force causes acceleration and a change in the velocity of the body for as long as it acts.The change in momentum is equal to the product of the average force and duration. Conversely, a small force applied for a long time produces the same change in momentum, the same impulse, as a larger force applied for a short time interval.

Impulse J is

$J = F_{average} (t_{2} - t_{1})$

The impulse is the integral of the resultant force (F) with respect to time

$J = \int_{t_{1}}^{t_{2}} F . d t$

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