PHY101-Physics Mid-Term Grand Quiz Fall 2021

 

MID-TERM GRAND QUIZ
 FALL 2020

Question No 1:

As per Coulomb’s law, the force of attraction or reputation between two (Raise For Success) point’s charges directly proportional to the:

• Cube of the distance
• Product of the magnitude of changes Correct
• Sum of the magnitude of changes
• Square of the distance between them

Question No 2:

A body is changing its direction but its speed is constant, (Raise For Success) the object is:

• Accelerating
• Slowing down
• Speeding
• Displacing Correct

Question No 3:

Stress can be (Raise For Success) measured in:

• N/m
• N-m
• N/m2 Correct
• N-m2

Question No 4:

A 4.0m long steel beam with a cross sectional area of 1.0 x 10-2 m2 and a Young’s module of 2.0 x 1011 N/m2 is wedged horizontally between two vertical walls. In order to wedge the beam, it is compressed by 0.020mm. If (Raise For Success) the coefficient of static friction between the beam and the walls is 0.70 the maximum mass (including its own) it can bear without slipping is:

• 3.6kg
• 36kg
• 71kg
• 710kg Correct

Question No 5:

Add two vectors of length 4m and 5m but their orientation is (Raise For Success) not known. The length after addition of these two vectors will be:

• Less than 1m
• Between 9m and 1m Correct
• Between 9m and 5
• 9m

Question No 6:

If the force (Raise For Success) acting on a body is doubled then the acceleration becomes:

• Double
• Half Correct
• One fourth
• Constant

Question No 7:

Change in (Raise For Success) mountain in one second is called:

• Impulse
• Torque
• Force
• Work

Question No 8:

A force of 5000N is applied outwardly to each of a 5.0-m long rod with (Raise For Success) a radius of 34.0cm and a Young’s modules of 125 x 108 N.m2. The elongation of the rod is:

• 0.0020mm
• 0.0040mm
• 0.14mm
• 0.55mm Correct

Question No 9:

The goal of all (Raise For Success) scientific inquiry (or scientific method) is:

• World peace
• Predicting natural events based on known patterns Correct
• To make everyone rich and happy
• World dominion

Question No 10:

The gravitational (Raise For Success) constant G has the derived units:

• N*m
• N*m/kg
• N*kg/m
• N*m2/kg2 Correct

Question No 11:

The momentum of an object at a given instant is independent (Raise For Success) of its:

• Acceleration Correct
• Velocity
• Speed
• Mass

Question No 12:

Lighter objects always reach the ground later than heavier (Raise For Success) objects.

Which is the most suitable explanation for the above statement?

I)                    There are some external forces acting on the object’s, for example, the air friction.

II)                  A heavier object has a large uniform velocity when it falls freely.

III)                 A heavier object has a larger acceleration due to gravity.

• i only Correct
• Ii only
• Ii and iii only
• Ii, iii and I

Question No 13:

A sound wave has a wavelength of 3.0m. The distance from a compression (Raise For Success) center to the adjacent rarefaction center is:

• 0.75m
• 1.5m Correct
• 3.0m
• Need to know frequency

Question No 14:

Which of the following statement is TRUE of sound intensity and (Raise For Success) decibel levels? Identify all the apply.

• The intensity of sound, which corresponds to the threshold of pain, is one trillion times more than the sound, which corresponds to the threshold of hearing.
• Two sounds, which have a ratio of decibel ratings, equal to 2.0. This mean that the second sound is twice as intense as the first sound.
• Sound A is 20 times more intense than sound B. So, if sound B is rated at 30dB, then sound A is rated at 50dB.
• A machine produces a sound, which is rated at 60dB. It two of the machines were used at the same time; the decibel rating would be 120dB. Correct

Question No 15:

The dimension (Raise For Success) of Joule is:

• [M L1 T-2]
• [M L2 T-1]
• [M L2 T-2] Correct
• [M L2 T-3]

Question No 16:

If the magnitude (Raise For Success) of force applied is increased, the work done will ________.

• Have no change
• Become zero
• Be increased Correct
• Be decreased 

Question No 17:

The speed of sound (Raise For Success) in medium depends upon:

• Amplitude
• Frequency
• Wavelength Correct
• Properties of the medium

Question No 18:

Question No 19:

The perpendicular distance between the axis of rotation and the line (Raise For Success) of action of the force is called the _______.

• Displacement
• Velocity
• Inertia
• Moment arm Correct

Question No 20:

The vibrations or the pressure variations inside the inner ear are converted into electrical signals by (Raise For Success) the _______

• Cochlea Correct
• Tympanic membrane
• Pinna
• Anvil

Question No 21:

A couple (Raise For Success) produces:

• Purely linear motion Correct
• Purely rotational motion
• Linear and rotational motion
• No motion

Question No 22:

Newton-second (Raise For Success) is SI unit of:

• Impulse Correct
• Acceleration
• Angular momentum
• Torque

Question No 23:

Physics is one of (Raise For Success) the branches of:

• Social Physics
• Physical sciences Correct
• Biological sciences
• Abstract art

Question No 24:

If F is the force (Raise For Success) acting on the last charge qo, the electrical field intensity E would be given by:

• E-qo/F
• E=F+qo
• E=F/qo Correct
• E=F-qo

Question No 25:

Which of the following statements about completely submerged objects (Raise For Success) resting on the ocean bottom is correct? 

• The buoyant force acting on to object is equal to the object’s weight Correct
• The apparent weight of the object depends on the objects density
• The displaced volume of fluid is greater than the volume of the object
• The weight of the object and the buoyant force are equal and opposite.

Question No 26:

For a body to be in (Raise For Success) equilibrium under the combined action of several forces:

• All the forces must be applied at the same point
• All of the forces form pairs of equal and opposite forces
• Any two of these forces must be balanced by a third force
• The sum of the torques about my point must equal zero Correct

Question No 27:

Young modulus is a proportionality constant that relates the force per (Raise For Success) unit area applied perpendicularly at the surface of an object to:

• The shear
• The fractional change in volume
• The fractional change in length Correct
• The pressure

Question No 28:

The speed of a (Raise For Success) sound wave is determined by:

• Its amplitude
• Its intensity
• The transmitting medium Correct
• Number of harmonics present

Question No 29:

When the momentum of (Raise For Success) a body is doubled, its kinetic energy _______

• Become ten times its kinetic energy
• Becomes four times its initial kinetic energy Correct
• Drops to zero
• Remains the same

Question No 30:

In ______ object returns (Raise For Success) to the original position if displaced slightly:

• Dynamic equilibrium
• Stable equilibrium Correct
• Unstable equilibrium
• Rotational equilibrium