[انا العمري]

ارجو منكم حل الاسئله ..
A) True or false and correct:
1 – The contact angle (θ) independent on the surface – tension of property of a certain liquid.
………………………………………………………………………………………….
2 - Restoring force always directed toward the equilibrium position and the displacement from equilibrium.
………………………………………………………………………………………….
3 – The focal length of lens defined as: the ability of the lens to refract light rays closer its surface.
………………………………………………………………………………………….
B) Choose the correct answer:
1 – The necessary condition for simple harmonic motion in simple pendulum is:
a) F = - k x b) F = k x c) F = 1 / k x
2 – In the capillary tubs, water rise in the tube because F. Cos (θ) is
a) Maximum b) Minimum c) Equal zero
3 – The unit of surface tension is
a) N / m b) N / m2 c) N.m


A) Complete the following:
1 – The magnitude of contact angle (θ) dependent ………………………
………………………………………………………………………………………….
2 – In helical spring if the mass is pulled down distance x = 2 cm and then released, if it travel one and half cycle of its motion. So,
x = ………………………………cm.
3 – The focal length of lens defined as: …………………………………….
…………………………………………………………………………………………
B) True or false and correct:
1 – The necessary conditions for simple harmonic motion in simple pendulum are F = - k x and θ >>>
[Where, F restoring force, x the displacement and θ the displacement angle].
………………………………………………………………………………………….

2 – In the capillary tubs, the water will stop rising when ……………..
…………………………………………………………………………….....................

3 – The unit of power of lens is ……………………………………….............

A) Complete the following:
1 – In the capillary tubes, the water ……………………… in the tube because …………………….. is maximum.
2 – The acceleration due to gravity equal …………………… with the unit …………………….
3 – The surface tension defined as: …………………………………………...
…………………………………………………………with the unit ………………
B) Choose the correct answer:
1 – The magnitude of the contact angle (θ) depends upon the:
a) Surface-tension property of liquid.
b) Liquid forces should maximum.
c) Liquid-solid forces must be very small.
2 – A block on the end of a spring is pulled to position x = 3 cm and released. In two full cycles of its motion, the total distance does it travels is:
a) x = 6 cm b) x = 12 cm c) x = 24 cm
3 – The force constant is directly proportional to the ………........, But oppositely directed.
a) Displacement.
b) Motion of pendulum.
c) The displacement angle.

A) Complete the following:
1 – The magnitude of the contact angle (θ) depends upon the ………
……………………………………………………………………………

2 - The force constant is directly proportional to the ……….......... But, ………………. directed.

3 – The focal length of the lens is defined as: …………………………
…………………………………………………………………………….

B) True or false and correct:
1 – The surface tension (γ) is defined as the force per unit area of the liquid with the unit of (N/m).
…………………………………………………………………………….
2 – The force constant k = 4 π2 /(m/T2) with unit gm / m.
……………………………………………………………………………..
3 – In the capillary tubes, the water rise in the tube because F. cos(θ) is must equal zero.
……………………………………………………………………………..




A) True or false and correct:
1 – The magnitude of the contact angle (θ) depends upon the physical properties of solid surface.
……………………………………………………………………………
2 – In the helical spring if the mass is pulled down a little and then released vibrate. In this situation there is unbalanced force acting opposite the direction.
……………………………………………………………………………
3 – The power of lens is defined as the reciprocal of the focal length in meters. And its unit is Diopter.
…………………………………………………………………………….

B) Choose the correct answer:
1 – The unit of force constant is
a) N/ m2 b) N.m c) gm / m2
2 – In the capillary tubes, the water rise in the tube because
a) F. cos(θ) = zero.
b) F. cos(θ) is maximum.
c) F. cos(θ) is minimum.
3 – The acceleration due to gravity (g) is:
a) g = 4 π2 /(L/T2) b) g = 4 π2 /(L.T2) c) g = 4 π2 (L/T2)


A) True or false and correct:
1 – In the capillary tubes, the water stop in the tube because F . cos (θ) is maximum.
………………………………………………………………………………………….
2 – The acceleration due to gravity g = 4 π2 (m/T2) with the unit m sec2.
…………………………………………………………………………………………..
3 – The surface tension defined as: is the work done per unit area of the liquid surface to decrease this area with unit N / m.
…………………………………………………………………………………………..
B) Choose the correct answer:
1 – The magnitude of surface tension change by change of
a) Surface-tension property of liquid.
b) Liquid temperatures.
c) Liquid-solid forces must be very small.
2 – A block on the end of a spring is pulled to position x = 3 cm and released. In half cycles of its motion, the total distance does it travels is:
a) x = 6 cm b) x = 12 cm c) x = 24 cm
3 – The focal length is reciprocal to the ………..
a) Power of lens. b) Displacement from lens to focal
c) Refractive index.

A) Complete the following:
1 – In the capillary tubes, the water stop in the tube when …………………………………………………………………………………..

2 – In helical spring when a mass pull down there are ……….…….......... force is always act …………………………………to the motion

3 – The Diopter defined as: ……………………………………………..……...
…………………………………………………………………………. ………………

B) True or false and correct:
1 – The surface tension is constant to any liquids and also don’t change with temperature changes.
…………………………………………………………………………………………..
2 – The unit of the acceleration due gravity is N/m and also the surface tension.
…………………………………………………………………………………………..
3 – The magnitude of contact angle is constant to all liquids and independent on solid surface.
……………………………………………………………………………. ……………



A) Choose the correct answer
1 – The surface tension depending upon
a) The properties of liquids.
b) The properties of solid surface.
c) The temperature which must be maximum.

2 - Restoring force always directed with ……………. and opposite the direction
a) Displacement b) Periodic time c) mass

3 – The unit of the focal length of lens
a) m b) m-1 c) Diopter

B) True or false and correct:
1 – The necessary condition for simple harmonic motion in simple pendulum is θ must be maximum. Where, θ is the displacement angle.
…………………………………………………………………………………………
2 – In the capillary tubs, water stop in the tube because F. Cos (θ) is
………………………………………………………………………………………….
3 – The unit of surface tension is j / m
…………………………………………………………………………………………..