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

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

Q1.

The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm in $m m^{2}$ is equal to

B. 1.5 × 10⁴

Answer : Option B
Explaination / Solution:

Radius of cylinder r = 2 cm = 20 mm

Height of cylinder h = 10 cm = 100 mm

Surface area of cylinder = $2 π r (r + h)$

= $2 \times 3.14 \times 20 (20 + 100)$

= $2 \times 3.14 \times 20 \times 120$

= 15072 mm2

$\approx 1.5 \times 10^{4} m m^{2}$

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

Q2. Angular resonant frequency and Q-factor of a series LCR circuit with L = 3.0 H, C = 27 μF, and R = 7.4 Ω are respectively

A. 111 rad/s 35

B. 90 rad/s 45 Hz

C. 100 rad/s 45

D. 111 rad/s 45

Answer : Option D
Explaination / Solution:

L = 3.0 H

C = 27 $μ F$

R = 7.4 $Ω$

Angular resonant frequency

$ω = \frac{1}{\sqrt{L C}} = \frac{1}{\sqrt{3 \times 27 \times 10^{- 6}}} = \frac{1}{9 \times 10^{- 3}} = 111 r a d / s$

Q-factor

$Q = \frac{1}{R} \sqrt{\frac{L}{C}} = \frac{1}{7.4} \sqrt{\frac{3}{27 \times 10^{- 6}}} = 45$

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

Q3. Meter Bridge is used to

A. determine unknown resistance R

B. determine unknown power P

C. determine unknown emf e

D. determine unknown voltage v

Answer : Option A
Explaination / Solution:

With a known resistance in one of the gaps, the meter bridge is used to determine the value of an unknown resistance by the formula,

$\begin{array}{l} \frac{R}{X} = \frac{l}{(100 - l)} \end{array}$

where l is the null point.

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

Q4. The total energy of a particle, executing simple harmonic motion is

A. ∝x

B. ∝x2

C. ∝x2

D. Independent of x

Answer : Option B
Explaination / Solution:

$E = K E + P E$

$K E = \frac{1}{2} m ω^{2} A^{2} s i n^{2} (ω t + ϕ)$

$P E = \frac{1}{2} m ω^{2} A^{2} c o s^{2} (ω t + ϕ)$

$E = \frac{1}{2} m ω^{2} A^{2}$ (as) $s i n^{2} (ω t + ϕ) + c o s^{2} (ω t + ϕ) = 1$

Thus total energy of the oscillator remains constant as displacement is regained after every half cycle.

no energy is dissipated then all the potential energy becomes kinetic and vice versa.

Figure below shows the variation of kinetic energy and potential energy of harmonic oscillator with time where phase φ is set to zero for simplicity

Under Graduate Entrance Exams NEET Entrance Exam # Physics Wave Optics Prepare / Learn

Q5. If ‘a’ is aperture size (i.e., slit or hole) and λ the wave length formula for Fresnel distance is

A. a2/2λ

B. λ2/a

C. λ2/2a

D. a2/λ

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q6. If we wanted to cancel the Earth’s magnetic field by running an enormous current loop around the equator, which way would the current have to flow: or west to east?

A. east to west

B. West to east

C. south to north

D. north to south

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q7. When Ge crystal is doped with phosphorus atoms, it becomes

A. n-type

B. superconductor

C. Insulator

D. p-type

Answer : Option A
Explaination / Solution:

Doping is the process of intentionally introducing impurities into an extremely pure (i.e., intrinsic) semiconductor in order to change its electrical properties. The impurities are dependent upon the type of semiconductor. Lightly and moderately doped semiconductors are referred to as extrinsic semiconductor. A semiconductor which is doped to such high levels that it acts more like a conductor than a semiconductor is called degenerate. Dopant atoms can either be “donors” or “acceptors.” Donors increase the elctron concentration in the silicon, whereas acceptors increase the hole concentration. When Germanium crystal is doped with phosphorus atoms, then it becomes N-type.

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

Q8. Domestic power supply in India is

A. 416 V 60 Hz

B. 220 V 50 Hz

C. 110 V 60 Hz

D. 24 V DC

Answer : Option B
Explaination / Solution:

The voltage in India is 220 volts, alternating at 50 cycles (Hertz) per second. This is the same as, or similar to, most countries in the world including Australia, Europe and the UK.

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

Q9. An echo repeats two syllables. If the velocity of sound is 330 m/s, then the distance of reflecting surface is

A. 16.5 m

B. 33.0 m

C. 66 m

D. 99 m

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q10. Figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15A. Capacitance and the rate of charge of potential difference between the plates are

A. 67.1

p F, 1.87 \times 1 0^{9} V s^{- 1}

B. 70.1

p F, 1.87 \times 1 0^{9} V s^{- 1}

C. 74.1

p F, 1.87 \times 1 0^{9} V s^{- 1}

D. 80.1

p F, 1.87 \times 1 0^{9} V s^{- 1}

Answer : Option D
Explaination / Solution:
No Explaination.

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