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

Under Graduate Entrance Exams NEET Entrance Exam # Physics Electrostatic Potential and Capacitance Prepare / Learn

Q1. Electric Potential is

A. potential energy of the field

B. potential energy per unit volume

C. potential energy per unit charge

D. potential energy of all charges

Answer : Option C
Explaination / Solution:

Electric potential V is the work done in bringing unit positive charge from infinity to the point in an electric field, and the potential energy

℧

is the work done in bringing any finite charge from infinity to the point in an electric field. They are related as,

℧ = q V

V = \frac{℧}{q}

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

Q2. Gauge pressure at a point is

A. pressure at that point + atmospheric pressure

B. (pressure at that point – atmospheric pressure)/2

C. pressure at that point – atmospheric pressure

D. (pressure at that point + atmospheric pressure)/2

Answer : Option C
Explaination / Solution:

Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. Negative signs are usually omitted

The difference between absolute pressure and atmospheric pressure is what we call gauge pressure ( $P_{g a u g e}$ ). It can be calculated if we know the absolute and atmospheric pressures using this formula:

$P_{g a u g e} = P_{a b s} - P_{a t m}$

Under Graduate Entrance Exams NEET Entrance Exam # Physics Kinetic Theory Prepare / Learn

Q3. The average distance a molecule can travel without colliding is called the

A. mean free path

B. mean free motion

C. mean free length

D. mean free distance

Answer : Option A
Explaination / Solution:

the mean free path is the average distance traveled by a moving particle (such as an atom, a molecule, a photon) between successive impacts (collisions), which modify its direction or energy or other particle properties

Under Graduate Entrance Exams NEET Entrance Exam # Physics Ray Optics and Optical Instruments Prepare / Learn

Q4. For a rectangular slab, refraction takes place at

A. One interfaces

B. Four interfaces

C. Three interfaces

D. Two interfaces

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q5. The nuclei of isotopes of a given element contain the same number of

A. Protons

B. Positrons

C. Neutrinos

D. Neutrons

Answer : Option A
Explaination / Solution:

Isotopes are variants of a particular chemical element which differ in neutron number. All isotopes of a given element have the same number of protons in each atom.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Moving Charges and Magnetism Prepare / Learn

Q6. The magnitude of the magnetic field due to a circular coil of radius R carrying a current I at an axial distance x from the centre is

A. B=μ0IR23(x2+R2)32

B. B=μ0IR22(x2+R2)32

C. B=μ0IR32(x2+R2)32

D. B=μ0IR22(x2+R2)35

Answer : Option B
Explaination / Solution:

magnetic field at a point located at a distance x from the center of the coil of radius R carrying current along its axis is

B = \frac{μ_{0} I R^{2}}{2 {(x^{2} + R^{2})}^{\frac{3}{2}}}

Under Graduate Entrance Exams NEET Entrance Exam # Physics Thermal Properties of Matter Prepare / Learn

Q7.

Relation between Kelvin (T) and Celsius scales ( $t_{C}$ ) is

A. T =

t_{C}

+ 32.15

B. T =

t_{C}

+ 212.15

C. T =

t_{C}

+ 180.15

D. T =

t_{C}

+ 273.15

Answer : Option D
Explaination / Solution:

TZ−TLTU−TL=TC−0100−0=TK−273.15373.15−273.15

Under Graduate Entrance Exams NEET Entrance Exam # Physics Units and Measurements Prepare / Learn

Q8. Newton is the SI unit of

A. acceleration

B. force

C. power

D. work

Answer : Option B
Explaination / Solution:

The newton is the SI unit for force; it is equal to the amount of net force required to accelerate a mass of one kilogram at a rate of one meter per second squared

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

Q9. Two resistances are connected in the two gaps of a meter bridge. The balance points is 20 cm from the zero end. When a resistance of 15 ohm is connected in series with the smaller of the two resistances, the null point shifts to 40 cm. The smaller of the two resistances has the value (in ohm)

A. 9.0

B. 10

C. 8

D. 12

Answer : Option A
Explaination / Solution:

Let the resistances be P and Q. When balanced,

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

Q10. Simple harmonic motion is motion represented by

A. x (t) = A exp (ωt + φ)

B. x (t) = A (ωt + φ)

C. x (t) = A cos (ωt + φ)

D. x (t) = A log (ωt + φ)

Answer : Option C
Explaination / Solution:

Equation of simple harmonic motion is given by

$x (t) = A \cos (ω t + ϕ)$

Where x(t) is the displacement of body at any instant of time

A is the amplitude of the body

$(ω t + ϕ)$ is the phase angle at the instant of time.

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