PHYSICS-OBJ

1-10: DAEDBEA

11-20: CBAEAEDDED

21-30: BCDCEECBCD

31-40: DCCCEBEACD

(1)

Coming!!!!

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(3i)

The principle of floatation states that when an object floats in a liquid the buoyant force/upthrust that acts on the object is equal to the weight of the object.

Weight of the object (W) = upthrust (F)

(3ii)

(i) Volume of the object

(ii) Density of the liquid

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(4i)

E= mgh = 40 X 10 X 0.3 X 6= 720J

(4ii)

P= mgh/t

m= PT/GH= 60 X 12 / 10 X 0.3 X 6 = 40g

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(5a).

Positive charge: This type of charge can be produced by rubbing a glass rod with silk.

(5b)

P₁ = 600mmHg

V₁ = 500cm³

T₁ = 23°C + 273.15 = 296.15K

T₂ = 37°C + 273.15 = 310.15K

P₂ = 720mmHg

V₂ =?

P₁V₁/T₁ = P₂V₂/T₂

V₂ = (P₁V₁T₂)/T₁P₂

V₂ = (600 x 500 x 310.15)/(296.15 x 720)

V₂ = (93045000)/213228

V₂ = 436.36cm³

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(6a)

In longitudinal waves, the particles transfer energy from one point to another by vibrating in the line of direction of propagation of the wave. The movement of particles is usually parallel to the movement of energy WHILE In transverse waves, the particles transfer energy from one point to another point by vibrating perpendicularly in the direction of the propagation of the wave. The particles are displaced perpendicular to the direction that the wave travels.

(6b)

(i) sound waves

(ii) seismic waves.

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(7i)

The angle between the incident ray and the normal is equal to the angle between the reflected ray and the normal.

(7ii)

(i) Colorimeter

(ii) spectrophotometer

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(8a)

Resistivity of a wire is the resistance per unit length and cross-sectional area. It is the property of the material that opposes the flow of charge or the flow of electric current. The unit of resistivity is ohm metre. We know that R = ρ L / A.

(8b).

R = ρ L / A.

ρ = R A /L

A = ρ L / R

A= 3.0 x 10^-6 x 4 / 0.5

A = 1.2 x 10^-5 / 0.5

A = 2.4 x 10^-5 m²