[مرجانه]

1 – True or false and correct:
a) The unit of constant force K is cm. sec2.

Correct Answer
unit of constant force K is N\m
b) The necessary condition for simple harmonic motion in simple pendulum is θ < 0.

. I don’t know

c) In the capillary rise, the water rises in the tube because F.Cos(θ) is maximum.
True
d) The contact angle (θ) independent on the surface – tension of property of a certain liquid.
True
e) A block on the end of a spring is pulled to position x = A and released. In one full cycle of its motion, the total distance dose it travels is 2A.
True
f) The unit of acceleration due to gravity g is N /m2
Correct Answer
unit of acceleration due to gravity g is cm\sec2

g) Restoring force always directed toward the equilibrium position and the displacement from equilibrium.

I don’t know
h) The power of a lens is the ability of the lens to refract light rays closer its surface

I don’t know


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2 – Choose the correct answer:
1) The acceleration due to gravity is:
a) g = kΔl / m b) g = 4π2/(l/T2) c) both of a &b is correct d) there is no answer correct above.
2) The necessary condition for simple harmonic motion in simple pendulum is:
a) F = -k x b) F = k x c) θ =0 d) sin (θ) = θ

3) The contact angle (θ) depend upon
a) The surface tension property of liquid.
b) The solid surface. c) Liquid forces should be maximum. d) Liquid – solid forces must be very small.
4) The force constant is:
a) k = gΔl / m b) k = 4π2/(m/T2) c) both of a &b is correct d) there is no answer correct above

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بالتوفيق .