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

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

Q1. If a magnet is suspended over a container of liquid air, it attracts droplets to its poles. The droplets contain only liquid oxygen and no nitrogen because

A. oxygen is ferromagnetic whereas nitrogen is diamagnetic

B. oxygen is diamagnetic whereas nitrogen is paramagnetic

C. oxygen is ferrimagnetic whereas nitrogen is diamagnetic

D. oxygen is paramagnetic whereas nitrogen is diamagnetic

Answer : Option D
Explaination / Solution:
No Explaination.

Under Graduate Entrance Exams NEET Entrance Exam # Physics Electronic Devices Prepare / Learn

Q2. A solid having uppermost energy – band partially filled with electrons is called

A. none of the above

B. a semi – conductor

C. an insulator

D. a conductor

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q3. With reference to the figure which shows a particle moving along a straight line , y axis represents the position and x axis represents time, if

x_{1}

= 18m, The average velocity at if

x_{1}

in m/s is

A. 18.0

B. 20

C. 1.8

D. 180

Answer : Option A
Explaination / Solution:

Average velocity can be defined as the displacement divided by the time.

Total displacement d = 18 m

Time taken t = 1 s

average velocity $v_{a v g} = \frac{T o t a l d i s p l a c e m e n t}{t i m e t a k e n}$

$= \frac{18}{1} = 18 m / s$

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

Q4. Two tuning forks of frequencies 250 Hz produce beats. If a maximum is produced just now, after how much time the minimum is produced at the same place

\frac{1}{24} s

\frac{1}{6} s

\frac{1}{6} s

\frac{1}{12} s

C. 112s

D. 118 s

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q5. The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is

B_{0}

= 510 nT. Amplitude of the electric field part of the wave is

A. 173N/C

B. 153 N/C

C. 158N/C

D. 163N/C

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q6.

A circular coil of radius 8.0 cm and 20 turns is rotated about its vertical diameter with an angular speed of 50 rad $s^{- 1}$ in a uniform horizontal magnetic field of magnitude $3 \times 10^{- 2}$ T. If the coil resistance is $10 Ω$ , maximum emf induced in the coil,maximum value of current in the coil and average power loss due to Joule heating are

A. 0.303 V, 0.0603 A,0.018 W

B. 0.603 V, 0.0603 A,0.038 W

C. 0.603 V, 0.0603 A,0.018 W .

D. 0.603 V, 0.0303 A,0.018 W

Answer : Option C
Explaination / Solution:

$e = N B A ω = 20 \times 3 \times 10^{- 2} \times (3.14 \times 0.08 \times 0.08) \times 50 = 0.603 V$

$i = \frac{e}{R} = \frac{0.603}{10} = 0.0603 A$

average power loss due to joule heating

$P = \frac{e i}{2} = \frac{0.603 \times 0.0603}{2} = 0.018 W$

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

Q7. If the wavelength of light incident on photo-electric cell be reduced from 4000

\overset{0}{A}

to3600

\overset{0}{A}

,then what will be the change in the cut off potential.

(h = 6.6 \times 1 0^{- 34} J - s, c = 3 .0 \times 1 0^{8} m / s, e = 1.6 \times 1 0^{- 19} C)

A. 0.43Volt

B. 0.34Volt

C. 0.42Volt

D. 0.30Volt

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q8. To radiate signals with high efficiency, the antennas should have a size

A. comparable to the wavelength λ of the signal (at least λ4)

B. much smaller than the wavelength λ of the signal

C. none of these

D. much greater than the wavelength λ of the signal

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q9. The position of a particle is given by

r = 3.0 t \hat{i} - 2.0 t^{2} \hat{j} + 4.0 \hat{k}

Find the velocity and acceleration of the particle.

A. 3.0i^−4.0tj^ , -4.0j^

B. 4.0i^−4.0tj^ , -3.0j^

C. 2.0i^−4.0tj^, -2.0 j

D. 5.0i^−4.0tj^, -3.0 j

Answer : Option A
Explaination / Solution:

Position vector $\vec{r} = 3.0 t \hat{i} - 2.0 t^{2} \hat{j} + 4.0 \hat{k}$

We know velocity is given by

$\vec{v} = \frac{d \vec{r}}{d t}$

So $\vec{v} = 3.0 \hat{i} - 4.0 t \hat{j}$

Acceleration is given by

$\vec{a} = \frac{d \vec{v}}{d t}$

So, $\vec{a} = - 4.0 \hat{j}$

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

Q10. Four point charges qA=2μC,qB=−5μC,qC=2μC,andqD=−5μC are located at the corners of a square ABCD of side 10 cm. Force on a charge of 1μC placed at the centre of the square is

A. 1.8 N

B. 3.6

C. 0 N

D. 4.5 N

Answer : Option C
Explaination / Solution:

EB-ED=0 and

E_{A} - E_{C}

so the net electric field at centre=0 so force on charge 1µC=0

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