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

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

Q1.

An ac generator consists of 8 turns of wire, each of area A=0.0900m² , and the total resistance of the wire is 12.0Ω. The loop rotates in a 0.500-T magnetic field at a constant frequency of 60.0 Hz. Maximum induced emf is

A. 136 V

B. 126 V

C. 106 V

D. 116 V

Answer : Option A
Explaination / Solution:

e=NBAω=NBA2πn=8×0.5×0.09×2×3.14×60=136V

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

Q2. Long distance radio broadcasts use short-wave bands because

A. None of the above

B. Ionosphere reflects waves in these bands.

C. Stratosphere reflects waves in these bands.

D. Troposphere reflects waves in these bands.

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q3. Maximum velocity of photoelectrons emitted from a metal surface having work function 4 eV is (given: frequency of incident radiations is

1 0^{15}

Hz)

A. 2

\times 1 0^{8} m s^{- 1}

B. None of these.

C. 2

\times 1 0^{8} m s^{- 1}

D. 3

\times 1 0^{5} m s^{- 1}

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q4. To reduce the distortion in amplitude modulation, modulation index is kept

A. small

B. very large

C. large

D. equal to 1

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q5.

At a distance L=400m from the traffic lights the brakes are applied to a locomotive moving at a velocity v=54km/hr. Determine the position of locomotive relative to the traffic lights 1 minute after the application of the brakes if its acceleration is -0.3m/s2.

A. 15 m

B. 25 m

C. 30 m

D. 40 m

Answer : Option B
Explaination / Solution:

Initial velocity u = 54 km/h = 15 m/s

Let Final velocity v = 0

Acceleration a = -0.3 m/s2

Time taken to stop = t

Using $v = u + a t$

=> $0 = 15 + (- 0.3) t$

=> t = 50 sec

It means it has been stopped before 1 minutes.

So distance covered in 1 minute

$v^{2} - u^{2} = 2 a s$

=> $0 - 225 = 2 \times (- 0.3) s$

=> s = 375 m

Position of locomotive relative to the traffic lights= 400-375 = 25 m

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

Q6. Six charges, each equal to + q, are placed at the corners of a regular hexagon of side a. The electric field at the point of intersection of diagonals is

A. 14πϵo.qa2

B. 14πϵo.6qa2

C. 14πϵo.3q√2a2

D. zero

Answer : Option D
Explaination / Solution:

The field of opposite charges cancels each other so net electric field at centre=0

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

Q7.

Compute the bulk modulus of water from the following data: Initial volume = 100.0 litre, Pressure increase = 100.0 atm (1 atm = 1.013

\times

1 0^{5}

Pa), Final volume = 100.5 litre

A. 2.126

\times

1 0^{9}

B. 2.226

\times

1 0^{9}

C. 2.026

\times

1 0^{9}

D. 2.326

\times

1 0^{9}

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q8.

Consider the cyclic process depicted in Figure If Q is negative for the process BC, and if $Δ E_{i n t}$ is negative for the process CA, what are the signs of W and $Δ E_{i n t}$ that are associated with BC?

A. 0, +

B. 0, -

C. 0, -

D. +, -

Answer : Option C
Explaination / Solution:

W = area under P-V curve = 0

$\begin{aligned} Δ Q = Δ E_{int} + W \\ W = 0, Δ Q = - v e \\ Δ E_{int} = - v e \end{aligned}$

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

Q9.

A shell of mass 0.020 kg is fired by a gun of mass 100 kg. If the muzzle speed of the shell is 80 m $s^{- 1}$ , what is the recoil speed of the gun?

A. 1.8 cm/s

B. 1.6 cm

s^{- 1}

C. 1.7 cm/s

D. 1.9 cm/s

Answer : Option B
Explaination / Solution:

Massof shell, $m = 0.02 k g$

Mass of gun, $M = 100 k g$

Speed of shell, $v = 80 m s^{- 1}$

Let V be the recoil speed of the gun. According to the law of conservation of momentum,

Initial momentum = Final momentum

$0 = m v + M V V = - \frac{m v}{M} = - \frac{0.02 \times 80}{100} V = - 0.016 m s^{- 1} = - 1.6 c m s^{- 1}$

Negative sign indicates that the gun moves backward as the bullet moves forward.

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

Q10. A 0.800-kg ball is tied to the end of a string 1.60 m long and swung in a vertical circle. (a) During one complete circle, starting anywhere, calculate the total work done on the ball by (i) the tension in the string and (ii) gravity

A. 30 J, 30 J

B. 25 J, -25 J

C. 0, 0

D. 10 J, 10 J

Answer : Option C
Explaination / Solution:

Work done by conservative force in round trip will be zero (displacement = 0). So that work done by tension and gravity will be zero.

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