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

Q1. The edge of an aluminum cube is 10 cm long. One face of the cube is firmly fixed to a vertical wall. A mass of 100 kg is then attached to the opposite face of the cube. The shear modulus of aluminum is 25 GPa. What is the vertical deflection of this face?

A. 2

\times

1 0^{- 6}

B. 8

\times

1 0^{- 6}

C. 4

\times

1 0^{- 6}

D. 6

\times

1 0^{- 6}

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q2. A steam engine delivers 5.4

\times

1 0^{8}

J of work per minute and services

3.6 \times 10^{9} J

of heat per minute from its boiler. What is the efficiency of the engine? How much heat is wasted per minute?

A. 12 percent, 2.8

\times

1 0^{9}

B. 14 percent, 3.0

\times

1 0^{9}

C. 15 percent, 3.0

\times

1 0^{9}

D. 13 percent, 2.9

\times

1 0^{9}

Answer : Option C
Explaination / Solution:

$\begin{aligned} η = \frac{W o r k D o n e}{H e a t E x t r a c t e d} = \frac{5.4 \times 10^{8}}{3.6 \times 10^{9}} = 0.15 = 15 % \\ H e a t w a s t e d = H e a t E x t r a c t e d - W o r k D o n e \end{aligned}$

Heat Wasted = $3.6 \times 10^{9} - 5.4 \times 10^{8} = 3.06 \times 10^{9} J$

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

Q3. A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom make a transition from the upper level to the lower level?

A. 6.1

\times 1 0^{14}

B. 5.1

\times 1 0^{14}

C. 5.6

\times 1 0^{14}

D. 6.6

\times 1 0^{14}

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q4. The ground state energy of hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?

A. 14.6 eV, –27.2 eV

B. 13.1 eV, –29.2 eV

C. 13.6 eV, –27.2 eV

D. 14.6 eV, –29.2 eV

Answer : Option C
Explaination / Solution:
No Explaination.

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

Q5.

A truck starts from rest and accelerates uniformly at 2.0 m $s^{- 2}$ . At t = 10 s, a stone is dropped by a person standing on the top of the truck (6 m high from the ground). What is the magnitude of acceleration (in m $s^{- 2}$ ) of the stone at t = 11s? (Neglect air resistance.)

A. 14

B. 12

C. 8

D. 10

Answer : Option D
Explaination / Solution:

When the stone is dropped from the truck , the horizontal force acting on it become zero after stone is released. Stone continue to move under the influence of gravity only. So that acceleration of the stone is equal to the gravitational acceleration g.

a = g = 10ms-2 acting vertically downward.

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

Q6. A 6.0-kg block initially at rest is pulled to the right along a horizontal, surface having a coefficient of kinetic friction of 0.15, by a constant horizontal force of 12 N. Find the speed of the block after it has moved 3.0 m.

A. 1.8 m/s

B. 0.8 m/s

C. 2.8 m/s

D. 3.8 m/s

Answer : Option A
Explaination / Solution:

ΔK=W

F=12N

f=μR=μmg=0.15×6×9.8=8.82N

12mv2−12mu2=Fnets

(12×6×v2)−0=3.18×3

3v2=3.18×3

v2=3.18

v=1.8m/sec

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

Q7. Albert Einstein was awarded the Nobel Prize for his work on

A. Explanation of photoelectric effect

B. E =

m c^{2}

C. scattering of light

D. Theory of relativity

Answer : Option A
Explaination / Solution:

The Nobel Prize in Physics 1921 was awarded to Albert Einstein "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect". Albert Einstein received his Nobel Prize one year later, in 1922.

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

Q8. When 2 charged conductors are connected by a wire,

A. there is always loss of energy

B. there will not be any change in energy

C. there is always gain of energy

D. there is loss or gain of energy depending upon the potentials of the

Answer : Option A
Explaination / Solution:

Let the two conductors have capacitances

C_{1}

and

C_{2}

and let their potentials be

V_{1}

and

V_{2}

. Total initial energy of the conductors

U_{i} = \frac{1}{2} C_{1} V_{1}^{2} + \frac{1}{2} C_{2} V_{2}^{2}

. When two charged conductors are connected by a wire, the flow of charge stops when the potentials are equalized. Let V be the common potential and

Q_{1}

and

Q_{2}

be the charges on the conductors after the common potential is attained.

The final energy

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

Q9. A jet airplane travelling at the speed of 500 kmh–1 ejects its products of combustion at the speed of 1500 km h–1relative to the jet plane. What is the speed of the combustion with respect to an observer on ground?

A. -2550 km/h

B. -2000 km/h

C. -1250 km/h

D. -1000 km/h

Answer : Option D
Explaination / Solution:

Speed of the jet airplane, vjet = 500 km/h Relative speed of its products of combustion with respect to the plane, vsmoke = – 1500 km/h

Speed of its products of combustion with respect to the ground = v′smoke

Relative speed of its products of combustion with respect to the airplane, vsmoke = v′smoke – vjet

=> – 1500 = v′smoke – 500

=> v′smoke = – 1000 km/h

The negative sign indicates that the direction of its products of combustion is opposite to the direction of motion of the jet airplane.

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

Q10. If two soap bubbles of different radii are in communication with each other

A. air flows from the smaller bubble into the larger one and large bubble grows at the expense of the smaller one

B. air flows from the larger into the smaller bubble until the radius of the smaller one becomes half that of the larger one

C. air flows from the larger bubble into the smaller one until the two bubbles are of equal size

D. the sizes of the bubbles remain unchanged

Answer : Option A
Explaination / Solution:
No Explaination.

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