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

Under Graduate Entrance Exams NEET Entrance Exam # Physics Electromagnetic Induction Prepare / Learn

Q1. The arm PQ of the rectangular conductor is moved from

x = 0

, outwards. The uniform magnetic field is perpendicular to the plane and extends from

x = 0

x = b

and is zero for

x > b

. Only the arm PQ possesses substantial resistance r. Consider the situation when the arm PQ is pulled outwards from

x = 0

x = 2 b

,and is then moved back to

x = 0

with constant speed v. flux and emf for

b \leq x < 2 b

b \leq x < 2 b

A. Blx,-Bv

B. Blb, zero .

C. Bl,-Blv

D. Bx,-Blv

Answer : Option B
Explaination / Solution:

ϕ=Blb

E=−dϕdt=0

Under Graduate Entrance Exams NEET Entrance Exam # Physics Dual Nature of Radiation and Matter Prepare / Learn

Q2.

If the energy of a photon corresponding to a wave length of 6000

\overset{0}{A}

is 3.32

\times 1 0^{19}

joule, the photon energy for a wavelength of 4000

\overset{0}{A}

will be

A. 6.98

\times 1 0^{19}

joules

B. 5.98

\times 1 0^{19}

joules

C. 2.22

\times 1 0^{19}

joules

D. 4.98

\times 1 0^{19}

joules

Answer : Option D
Explaination / Solution:

E=hcλE1E2=λ2λ13.32×1019E2=40006000E2=6×3.32×10194=4.98×1019J

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

Q3. Fourier series of a periodic rectangular pulse has a

A. discontinuous spectrum

B. continuous spectrum

C. none of these

D. discrete spectrum

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q4. In a harbor, wind is blowing at the speed of 72 km/h and the flag on the mast of a boat anchored in the harbor flutters along the N-E direction. If the boat starts moving at a speed of 51 km/h to the north, what is the direction of the flag on the mast of the boat?

A. approximately north

B. approximately north-east

C. approximately south

D. approximately east

Answer : Option D
Explaination / Solution:

The flag is fluttering in the north-east direction. It shows that the wind is blowing toward the north-east direction. When the ship begins sailing toward the north, the flag will move along the direction of the relative velocity (vwb) of the wind with respect to the boat.

The angle between vw and (–vb) = 90° + 45°

tan β = $\frac{51 S i n (90 + 45)}{72 + 51 C o s (90 + 45)}$

Substituting and solving we get,

tan β = $\frac{51}{50.80} = 1.0038$

∴ β = tan-1(1.0038) = 45.110

Angle with respect to the east direction = 45.11° – 45° = 0.11°

Hence, the flag will flutter approximately due east.

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

Q5. An uncharged sphere of metal is placed inside a charged parallel plate capacitor. The lines of force look like

A. Correct option is A

B. Correct option is B

C. Correct option is C

D. Correct option is D

Answer : Option C
Explaination / Solution:

Electric lines of force never intersect the conductor. They are perpendicular and slightly curved near the surface of conductor.so answer is A

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

Q6.

A steel rod 2.0 m long has a cross-sectional area of 0.30

c m^{2}

. It is hung by one end from a support, and a 550-kg milling machine is hung from its other end. Determine the stress on the rod.

A. 1.2

\times

1 0^{8}

B. 1.4

\times

1 0^{8}

C. 1.8

\times

1 0^{8}

D. 1.6

\times

1 0^{8}

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q7. In changing the state of a gas adiabatically from an equilibrium state A to another equilibrium state B, an amount of work equal to 22.3 J is done on the system. If the gas is taken from state A to B via a process in which the net heat absorbed by the system is 9.35 cal, how much is the net work done by the system in the latter case?

A. 17.2 J

B. 17.6 J

C. 16.8 J

D. 17.9 J

Answer : Option C
Explaination / Solution:

$Δ Q = Δ U + W$

In adiabatic process $Δ Q = 0$

$Δ U = - W$

Given that W = -22.3J

$Δ U = 22.3 J$

in second process $Δ Q = 9.35 \times 4.18 = 39.083 J$

$Δ Q = Δ U + W$

$\begin{aligned} Δ Q = 9.35 \times 4.18 = 39.083 J \\ Δ Q = Δ U + W \\ 39.083 = 22.3 + W \\ W = 16.8 J \end{aligned}$

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

Q8. In the ground state of which model electrons are in stable equilibrium with zero net force?

A. Rutherford’s model

B. Bohr model

C. No model

D. Thomson’s model

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q9. A body of mass 5 kg is acted upon by two perpendicular forces 8 N and 6 N. Give the magnitude and direction of the net force acting on the body.

A. 14 N at an angle of 37

^{\circ}

to the 8 N force

B. 16 N at an angle of 46

^{\circ}

to the 8 N force

C. 12 N at an angle of 36

^{\circ}

^{\circ}

towards the 8 N force

D. 12 N at an angle of 38

^{\circ}

to the 8 N force

Answer : Option C
Explaination / Solution:

Let F1 = 8N & F2 = 6 N.

then the resultant force is $F = \sqrt{F_{1}^{2} + F_{2}^{2}}$

= $\sqrt{8^{2} + 6^{2}}$

= 10N

The direction is determined as $t a n θ = \frac{F_{2}}{F_{1}}$

= 6/8

therefore $θ = 36^{o} 52^{o}$

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

Q10. A railway porter is holding a weight of 100 kgs on his head and is standing still. What is the work done by him?

A. 0 J

B. 100 J

C. 200 J

D. 1000 J

Answer : Option A
Explaination / Solution:

W = Force x displacement in the direction of force Work done will be zero because porter is stationary (i.e. displacement is zero)

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