WorksheetsTheoretical Physics test-exam
Total questions: 48
Worksheet time: 2hrs 36mins
In air, a piece of paper falls slower than a steel ball because of:
The mass of the steel ball is larger than the mass of the piece of paper.
The weight of the steel ball is larger than the weight of the piece of paper.
Air resistance.
None of the following
The average acceleration is:
The magnitude of the instantaneous velocity.
The magnitude of the instantaneous acceleration.
The change of position divided by the time elapsed.
None of the following.
The instantaneous velocity is defined as the average velocity evaluated for:
A given time interval.
A given displacement.
An extremely short time interval.
None of the above.
Which of the following are vector quantities?
acceleration, velocity, displacement, force
temperature, speed, energy, force
velocity, speed, distance
none of the above
Which of the following statements is correct?
A scalar is defined by its magnitude and its direction
The magnitude of a vector is always positive
A vector is defined by a number and a unit
A scalar is always positive
Two opposite vectors:
have the same direction but different magnitudes
have the same magnitude and direction
have the same magnitude but opposite directions
have the same magnitude but different directions
A person walks 1 km due north and then 1 km due south. Which of the following statements is correct?
He travels a distance of 1 km
His displacement is equal to zero
The traveled distance is zero
both a and b
An object is moving with constant velocity in a straight line. Which of the following statements is true?
The net force on the object is zero
A constant force is being applied in the direction of motion
There are no forces acting on the object.
There is no frictional force acting on the object.
If you exert a force F on an object, the force which the object exerts on you will
depend on your mass.
depend on whether or not the object is moving.
always be:– F
depend on whether or not you are moving.
What does the word "normal" mean in the phrase "normal force"?
the component of the force exerted by a surface parallel to the surface
the force is due to contact between two objects.
the force that is usually exerted by a surface
the component of the force exerted by a surface perpendicular to the surface
the total force exerted by a surface
the cgs system, which units of the length, mass and time is:
Foot, slug, second
Centimeter, gram, second
Centimeter, kilogram, second
Meter, kilogram, second
Motion that happening under the influence of gravity only is known asL
Gravitational motion
Free Fall
Constant motion
None of the following
A car travels east with constant velocity. What is the net force on the car?
south
zero
east
west
Acceleration is always in the direction of:
the initial velocity
the final velocity
the displacement
the net force
What happens to a stationary object if the resultant force on it is zero ?
It stays still
It moves slowly
It moves quickly
none of these
Force is defined as :
Mass*Velocity
Pressure/Area
Mass/Volume
Mass*Acceleration
What is the SI unit of force?
N
J
Kg
Pa
What happens to a moving object if the resultant force on it is not zero
It speeds up in the direction of the resultant force.
It slows down in the direction of the resultant force.
It moves towards the resultant force.
** غير متاكد من الاجابه 100% لذلك المعذره لو طلعت اجابة هذا السؤال خاطئه
The reaction force exerts in the same direction of the action force
True
False
The gravitational force acting on an object is called its :
Mass
Weight
Density
Volume
stable equilibrium
unstable equilibrium
neutral equilibrium
none of these
If we double the resultant force applied to an object, what happens to its acceleration ?
It stays the same
It doubles
It halves
None of the following
Frictional forces in fluids are called :
Viscous forces
mechanical forces
Acoustic forces
none of these
Force multiplied by lever arm:
Center of Gravity
Rotational Speed
Torque
Center of Mass
A negative net torque on a rigid body means that this body is able to rotate :
Anti-clockwise
Clockwise
Out of the page
None of these
A positive net torque on a rigid body means that this body is able to rotate :
Anti-clockwise
Clockwise
Into the page
None of these
A rigid body is in translational equilibrium if:
The total torque on the rigid body is zero ∑𝝉 ⃗ = 𝟎
The net force on the rigid body is zero∑𝑭 =0
The mechanical advantage is zero 𝑴.𝑨 = 𝟎
None of theme
A rigid body is in rotational equilibrium if:
The total torque on the rigid body is zero ∑𝝉 ⃗ = 𝟎
The net force on the rigid body is zero∑𝑭 =0
The mechanical advantage is zero 𝑴.𝑨 = 𝟎
None of theme
During a complete heart pumping cycle, the pressure in the heart is:
Constant
At its maximum value
Goes through both a maximum and a minimum
Decreases
If the diameter of a small horizontal portion of an artery is reduced, then, according to the Bernoulli's theorem:
The velocity of blood decreases and the pressure decreases.
The velocity of blood increases and the pressure decreases.
The velocity of blood decreases and the pressure increases.
The velocity of blood increases and the pressure increases.
Bernoulli’s equation can be used under the following conditions:
The fluid is incompressible, non-viscous and the flow is turbulent and steady.
The fluid is incompressible, non-viscous and the flow is turbulent.
The fluid is incompressible, non-viscous and the flow is streamline and steady.
The fluid is incompressible, non-viscous and the flow is streamline.
The sphygmomanometer is used in upper human arm because:
it gives the difference in blood pressue between the heart and the upper arm.
it gives real value of blood pressure in the humain body.
it is easy to read the blood pressure.
it gives values nearly close to the pressure in the heart.
An incompressible fluid is a fluid with a :
Constant viscosity
Constant pressure
Constant density
Constant velocity
Turbulent
Compressible
Laminar
Incompressible
As a liquid temperature increases,
The viscosity doubles
Its viscosity increases
Its viscosity decreases
Its viscosity remains unchanged
As a gas temperature increases
Its viscosity increases
The viscosity doubles
Its viscosity decreases.
Its viscosity remains unchanged
For a viscous fluid,
The greater the viscosity, the larger the force required to maintain the flow.
The greater the viscosity, the smaller the force required to maintain the flow.
Viscosity and the force required to maintain the flow are not related.
The decrease viscosity, the larger force required to maintain the flow.
In a horizontal tube with constant cross section, Bernoulli's equation can be used for
Only non-viscous fluids
Non viscous fluids and its pressure constant along the tube
Both viscous and non-viscous fluids.
Only viscous fluids
A person cannot see the objects distinctly, when placed at a distance less than 90 cm. Identify the defect of vision:
Myopia
Nearsightedness
Hypermetropia
Astigmatism
In myopia:
Reduction of accommodation occurs due to age
Light from an object close to the eye is focused toward a point behind the retina
Parallel light from distant object is focused at a point in front of the retina
A person cannot simultaneously focus on both horizontal and vertical lines
Usually the flow resistance in a large artery is small .consequently the pressure drop in such arteries is
Small
Large
Zero
None of these
Astigmatism
Hypermetropia
Myopia
Presbyopia
When the eye cannot simultaneously focus on both horizontal and vertical lines, the defect is called :
Astigmatism
Hypermetropia
Myopia
Presbyopia
Diverging lenses are used to correct :
Astigmatism
Hypermetropia
Myopia
Presbyopia
Which one of the following radiation possesses maximum penetrating power?
β – rays
β + rays
gamma rays
alpha rays
In Alpha decay:
Z decreases by 2 and A decreases by 4
Z and A are unchanged
Z decreases by 4 and A decreases by 2
Z decreases by 4 and A decreases by 4
Isotopes are nuclear species that have:
the same neutron number and the same atomic number.
the same neutron number and the different atomic number.
the same neutron number and the same proton number.
the same atomic number and the different mass number.
The effective half-life of radionuclide is:
same biological half life
same physical half life
less than either the biological and physical half life
greater than either the biological and physical half life
