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

Under Graduate Entrance Exams NEET Entrance Exam # Physics Physical World Prepare / Learn

Q1. One example where technology predates science is

A. laser surgery

B. Radio

C. Steam engine

D. TV

Answer : Option C
Explaination / Solution:

Thomas Newcomen's atmospheric engine was the first commercial true steam engine using a piston, and was used in 1712 for pumping in a mine. They became popular for mining and 104 were in use by 1733, eventually over two thousand of them were installed. In1781 Scottish engineer James Watt patented a steam engine that produced continuous rotary motion. Watt's ten-horsepower engines enabled a wide range of manufacturing machinery to be powered. The engines could be sited anywhere that water and coal or wood fuel could be obtained.

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

Q2. A metal plate of thickness half the separation between the capacitor plates of capacitance C, is inserted between the plates. The new capacitance is

A. 0.0

B. C

C. c/2

D. 2C

Answer : Option D
Explaination / Solution:

The capacitance C of a parallel plate capacitor is given by

C = \frac{ε_{0} A}{d}

A metal plate of thickness d/2 when introduced between the plates reduces the distance between the plates to d/2. The effective capacitance becomes

Another explanation: The system can be considered to be three capacitors

C_{1}

C_{2}

, and

C_{3}

connected in series.

K of a metal is infinity.

C_{2} = \infty

. The equivalent capacitance

Under Graduate Entrance Exams NEET Entrance Exam # Physics System of Particles and Rotational Motion Prepare / Learn

Q3. A uniform rod of mass 2 kg is 1 meter long. Its radius of gyration about an axis through its one end and perpendicular to its length in SI units is

A. 2 /

\sqrt

(3)

C. 1 /

\sqrt

(3)

D. 1/ 2

\sqrt

(3)

Answer : Option C
Explaination / Solution:

Moment of inertia of rod about an axis through its one end and perpendicular to its length

$I = M L 2 3$ M = 2 KgL = 1 mMoment of inertia of rod in terms of radius of gyrationI = Mk2 $M L 2 3 = M k 2 k = L 2 3 - - - \sqrt = L 3 - \sqrt = 1 3 - \sqrt$

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

Q4. Two small drops of mercury, each of radius r, form a single large drop. The ratio of surface energy before and after this change is

A. 1:2

^{1 / 3}

B. 1:2

C. 2

^{1 / 3}

D. 2:1

Answer : Option A
Explaination / Solution:

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

Q5.

At what temperature is the root mean square speed of an atom in an argon gas cylinder equal to the rms speed of a helium gas atom at – 20 $^{\circ} C$ ? (Atomic mass of Ar = 39.9 u, of He = 4.0 u).

A. 2.26

\times

1 0^{3}

B. 2.77

\times

1 0^{3}

C. 2.52

\times

1 0^{3}

D. 2.63

\times

1 0^{3}

Answer : Option C
Explaination / Solution:

vAr=vHe3RT39.9−−−−−√=3R×2534−−−−−−−−√T=39.9×2534=2.52×103K

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

Q6. Binoculars is preferred to a terrestrial telescope to observe a cricket match, because

A. binoculars gives three dimensional view

B. telescope does not give erect image

C. binocular has shorter focal length

D. telescope has chromatic aberration

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q7. Plutonium decays with half life of 24000 years. If plutonium is stored for 72000 years, the fraction of it that remains is

A. 41282.0

B. 1 /3

C. 1 /4

D. 1 /2

Answer : Option A
Explaination / Solution:
No Explaination.

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

Q8. Which of the following statement(s) is/are true? (I) Every substance contains heat. (II) For heat to flow between two substances, they must be at different temperatures. (III) The internal energy of a substance is equal to the kinetic energy of the molecules in the substance.

A. I and II only

B. II only

C. II and III only

D. III only

Answer : Option B
Explaination / Solution:

Heat is the form of energy that is transferred from one body to another as the result of a difference in temperature

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

Q9.

How many g $c m^{2} s^{- 2}$ does 1 kg $m^{2} s^{- 2}$ equal?

A. 107

B. 103

C. 105

D. 108

Answer : Option A
Explaination / Solution:

We know 1 kg = 103 g

1 m2 = 104 cm

1 s-2 = 1s-2

multiply all these quantities we get

=> 1 kg m2 s-2 = $10^{3} \times 10^{4} g c m^{2} s^{- 2}$

$=> 1 k g m^{2} s^{- 2} = 10^{7} g c m^{2} s^{- 2}$

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

Q10. A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.5 Ω per km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town. Power that the plant supply, assuming there is negligible power loss due to leakage is

A. 1400 kW

B. 1000 kW

C. 1300 kW

D. 1200 kW

Answer : Option A
Explaination / Solution:

Total electric power required, P = 800 kW

supply voltage V = 220 volt

voltage at which electric plant generating power V1 = 440 volt

distance between town and power generating station, d = 15 km

total resistance of two wire cable R = (15+15) x 0.5 = 15 ohm

input voltage of transformer Vi = 4000 volt

output voltage of transformer Vo = 220 volt

current in wire line

$i = \frac{P}{V_{i}} = \frac{800 \times 10^{3}}{4000} = 200 A$

$P_{l o s s} = i^{2} R = 200 \times 200 \times 15 = 600 \times 10^{3} = 600 K W$

total power supplied by the plant = 800 + 600 = 1400 KW

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