Grade 10 - Samacheer Kalvi - Laws of Motion & Optics
An interactive worksheet by GomathyD
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A very good day to you mam. Hope this message finds you well. I am Jonathan H of class X-A and I've completed my task mam.It was engrossing and I enjoyed spending time in these tasks.
ReplyDeleteExplanation:
I.Choose
1.Force is proportional to change in momentum/time
2.W=m x g, g=w/m, unit of weight is newton,unit of mass is kg, N/kg=Nkg-¹
3.1N=10 power 5 dyne
1kgf=9.8N
=9.8x10x10x10x10x10
=98x10⁴dyne
4.M=Fxd
F=40N
d=90cm=0.9m
=40x0.9=36Nm
5.The speed of light will be maximum when the refractive index is minimum
A has the minimum refractive index-1.31
IV.True or false
1.False-The linear momentum of a system of particles is conserved when no external force is applied.
2.False-The apparent weight of a person is not equal to his actual weight and it is equal when he/lift is at rest and it varies depending on the movement of the lift.
3.False-Weight of a body is lesser at the equator and greater at the polar region.
4.False-Turning a nut with a spanner with a long handle is so easy than one with a short handle.
5.False-Astronauts and orbiting space stations are under free fall condition with same acceleration, so the astronauts feel weightlessness
III.Fill in
1.The path of light is called a ray
2.The refractive index of a transparent medium will be greater than that of vacuum.
3.If the energy of incident beam and scattered beam are same, then the scattering of light is called elastic scattering.
4.According to Rayleigh's scattering law,the amount of scattering of light is inversely proportional to the fourth power of its wavelength.
II.Match
1.Retina-Screen of light (delicate membrane having enormous number of light sensitive cells or photo-receptors.
2.Pupil-Pathway of light(Pathway for the light to retina)
3.Ciliary muscles-Power of accommodation(helps the eye to achieve the ability to focus nearby as well as distant objects)
4.Myopia-Far point comes closer(short sightedness,occurs due to the lengthening of eye ball)
5.Hypermetropia-Near point moves away(long sightedness, occurs due to shortening of eye ball)
Thanking you.
From,
Jonathan H
COOL!. Actually it was like this , if any students wants an explanation the student can mention the question no in comment so we will post the explanation as a separate post
DeleteBut GOOD JOB done by you