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

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

Q1. A man of mass 70 kg stands on a weighing scale in a lift which is moving downwards with a uniform acceleration of 5 m

s^{- 2}

what would be the reading on the scale?

A. 35 kg

B. 53 kg

C. 38 kg

D. 45 kg

Answer : Option A
Explaination / Solution:

When the lift moves downward with acceleration = 5 ms-2 the net force acting downward

$\begin{aligned} m g - N = m a \\ N = m g - m a \\ N = m (g - a) \\ N = 70 (10 - 5) \\ N = 350 N \end{aligned}$

R = 350 N

therefore reading on the scale = $\frac{350}{g} = \frac{350}{10} = 35 k g$

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

Q2. A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated. How much work does she do against the gravitational force?

A. 49000 J

B. 59000 J

C. 45000 J

D. 55000 J

Answer : Option A
Explaination / Solution:

Work done by force applied against gravity for one lift will be

$W = F s = m g h = 10 \times 9.8 \times 0.5 = 49 J$

So work done for 1000 lifts = 49 x 1000 = 49000 J

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

Q3. In electrolytic capacitors positive terminal is

A. either of the two terminals

B. one on which aluminium oxide film is formed

C. none of the above.

D. one on which aluminium oxide film is not formed

Answer : Option B
Explaination / Solution:

Aluminium electrolytic capacitors have the Aluminium foil anode (positive terminal) which is etched and covered with a layer of Aluminium Oxide which acts as a dielectric. The whole assembly is covered using a paper separator soaked in electrolyte such as, Borax or Glycol and covered by Aluminium foil which acts as cathode ( negative electrode)

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

Q4. Strong Nuclear Force

A. is responsible for holding the nucleus of an atom together

B. is a long range force

C. is responsible for holding the nucleus of an atom and the electrons

D. is responsible for holding the electrons of an atom together

Answer : Option A
Explaination / Solution:

The strong nuclear force is the nuclear binding force, the force that provides the attraction.it might also be responsible for holding particles together within the nucleus of atoms.

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

Q5.

The moment of inertia of a solid sphere about a diameter is 8000 gms $c m^{2}$ (mass of sphere = 50 gm, radius = 20 cm). The moment of inertia about a tangent will be

A. 8400 gm

c m^{2}

B. 280 gm

c m^{2}

C. 2.8

\times

1 0^{3}

c m^{2}

D. 2.8

\times

1 0^{3}

c m^{2}

Answer : Option D
Explaination / Solution:

I = 2/5 MR2 = 8000 gm cm2 , using parallel axis theorem the moment of Inertia about tangent to sphere is = 2/5 MR2+ MR2 = 7/5 MR2. =2.8 $\times$ $1 0^{4}$ gm cm2

$c m^{2}$

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

Q6. Small droplets of liquid are usually more spherical in shape than larger drops of the same liquid because

A. force of gravity and force of surface tension act in the same direction and are equal

B. force of surface tension predominates the force of gravity

C. force of surface tension is equal and opposite to the force of gravity

D. force of gravity predominates the force of surface tension

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q7. A 14.5 kg mass, fastened to the end of a steel wire of unstretched length 1.0 m, is whirled in a vertical circle with an angular velocity of 2 rev/s at the bottom of the circle. The cross-sectional area of the wire is 0.065

c m^{2}

. Calculate the elongation of the wire when the mass is at the lowest point of its path.

A. 1.239

\times

1 0^{- 4}

B. 1.339

\times

1 0^{- 4}

C. 1.439

\times

1 0^{- 4}

D. 1.539

\times

1 0^{- 4}

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q8. An equi-convex crown glass lens has a focal length 20 cm for violet rays. Its focal length for red rays is

μ_{v} = 1.5 & μ_{r} = 1.47

A. 20.82 cm

B. 24.85 cm

C. 22.85 cm

D. 21.28 cm

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q9. Which of the following is the best nuclear fuel

A. Uranium – 236

B. Plutonium – 239

C. Thorium – 236

D. Neptunium – 239

Answer : Option B
Explaination / Solution:
No Explaination.

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

Q10.

A large steel wheel is to be fitted on to a shaft of the same material. At 27 $^{\circ}$ C, the outer diameter of the shaft is 8.70 cm and the diameter of the central hole in the wheel is 8.69 cm. The shaft is cooled using ‘dry ice’. At what temperature of the shaft does the wheel slip on the shaft? Assume coefficient of linear expansion of the steel to be constant over the required temperature range: $α_{s t e e l}$ = 1.20 $\times$ $1 0^{- 5}$ $K^{- 1}$

A. – 69

^{\circ}

B. – 59

^{\circ}

C. – 89

^{\circ}

D. – 79

^{\circ}

Answer : Option A
Explaination / Solution:

$\begin{aligned} α = \frac{Δ l}{l Δ T} \\ Δ T = \frac{Δ l}{l α} = \frac{0.01}{8.70 \times 1.2 \times 10^{- 5}} = 96 C^{\circ} \end{aligned}$

final temp. = $27 - 96 = - 69^{\circ} C$

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