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

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

Q1. The vector product of two vectors a and b is a vector c such c is perpendicular to the plane containing a and b and the direction is given by is given by

A. index finger rule

B. left hand rule

C. right handed screw rule

D. left handed screw rule

Answer : Option C
Explaination / Solution:

If vectors A and B lie in the plane of this page, the vector C will be perpendicular to this plane.
The sense (upward or downward) of the direction of the vector product is given by the direction of the advance of the tip of a right-handed screw when rotated from A to B through angle

θ

between them, the screw being placed with its axis perpendicular to the plane containing the two vectors.

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

Q2. The S.I unit of force is

A. Newton

B. dyne

C. erg

D. Joule

Answer : Option A
Explaination / Solution:

In International System of Units (SI) the newton is the unit for force. It is equal to the amount of net force required to accelerate a mass of one kilogram at a rate of 1 m/sec2 in direction of the applied force. It is named after Isaac Newton in recognition of his work on classical mechanics, specifically Newton's second law of motion.

$1 N = 1 K g m / \sec^{2}$

Dyne is a cgs unit of force. One dyne is equal to 10−5 N

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

Q3. Digital weighing balance uses

A. a velocity transducer

B. an acceleration transducer

C. a position transducer

D. a force transducer

Answer : Option D
Explaination / Solution:

A force transducer is also known as a force sensor this converts an input mechanical force into output electrical signal.Hence a force transducer is used in digital weighing balance.

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

Q4. The addition of vectors and the multiplication of a vector by a scalar together gives rise to

A. intransitive law

B. distributive laws

C. asymmetric laws

D. commutative law

Answer : Option B
Explaination / Solution:

If a vector is multiplied by a scalar as in $p \vec{A}$ , then the magnitude of the resulting vector is equal to the product of p and the magnitude of $\vec{A}$ , and its direction is the same as $\vec{A}$ if p is positive and opposite to $\vec{A}$ $\vec{A}$ if p is negative.

Distributive law for scalar multiplication:

$p (\vec{A} + \vec{B}) = p \vec{A} + p \vec{B}$

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

Q5. Electrostatic force is

A. force exerted by one charge on another when the two are at rest in a given frame of reference

B. force exerted by one charge on another when the two are moving in a given frame of reference

C. force exerted by an electron on a neutron

D. force exerted by one charge on another when the two are accelerating in a given frame of reference

Answer : Option A
Explaination / Solution:

Electrostatics means charges at rest,or relatively at rest so this force can be applicable only when charge produce electric field which is constant which is possible only when charges at rest or relatively at rest.

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

Q6. volume strain is defined

A. as the ratio of change in volume (ΔV) to thrice the original volume V

B. as the change in volume ΔV

C. as the ratio of change in volume (ΔV) to twice the original volume V

D. as the ratio of change in volume (ΔV) to the original volume V

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q7. First Law of Thermodynamics is

The first law of thermodynamics is the application of the conservation of energy principle to heat and thermodynamic processes:

$Δ Q = Δ U + Δ W$

A. the general law of conservation of momentum applied to any system in which the energy transfer from or to the surroundings is taken into account

B. the general law of conservation of angular momentum applied to any system in which the energy transfer from or to the surroundings is taken into account

C. the general law of conservation of mass applied to any system in which the energy transfer from or to the surroundings is taken into account

D. the general law of conservation of energy applied to any system in which the energy transfer from or to the surroundings is taken into account

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q8. Newtonian mechanics could not explain

A. fall of bodies on earth

B. Some of the most basic features of atomic phenomena.

C. movement of planets

D. flight of rockets

Answer : Option B
Explaination / Solution:

When science progressed into the realm of the microscopic, of dimensions the size of an atom, i.e. less than a nanometer, it was observed that newtonian mechanics and classical electrodynamics were in contradiction with experiments, could not explain them. At the microscopic level, forces don't have a meaning, because nothing touches directly anything else. There are intermediate force carriers of what is perceived as "force" macroscopically.

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

Q9. spectrum is

A. The splitting into the component colors of white light when passed through a prism or a diffraction grating

B. The splitting into the component colors or wavelengths of light when passed through a lens.

C. the splitting into the component colors or wavelengths of monochromatic light when passed through a prism or a diffraction grating

D. The splitting into the component colors or wavelengths of light when passed through a prism or a diffraction grating

Answer : Option D
Explaination / Solution:
No Explaination.

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

Q10. The force acting on a freely falling body in terms of mass m and acceleration due to gravity g is

A. F =

m^{- 2}

B. F =

m^{2}

C. F = m

g^{2}

D. F = mg

Answer : Option D
Explaination / Solution:

according to newton's second law of motion F = ma here acceleration is due to gravity and is equal to g. So that for a freely falling body F = mg

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