2015 - JAMB Physics Past Questions and Answers - page 7

Volatile liquids (i.e. Ammonia or Freon) are usually have low boiling point

d = y, s = 6 m/s (The Man & Plane Mirror)

d – δy, s = (5 – ;6) m/s (The Man and Image)

d₂ ÷ s₁ = d₂ ÷ s₂, y ÷ 6 = 2y ÷ s + 6

Y (s + 6) = 2y × 6

s + 6 = 12

S_o = 12 – 6 = 6

Since S + 6 = 0

Then, S = 6 (substitute the value of S i.e S = 6)

Into S + 6 = 0

∴S_o = S + 6 = 6 + 6 = 12 m/s

∴ S = 12 m/s

Voltmeter: an instrument for measuring electric potential in volts

Galvanometer: it is a device used to indicate direction of a small electric current

Potentiometer: is a device for measuring or comparing e.m.fs of cells

Meter rule: measuring a distance at different points

In an inelastic collision, linear momentum is conserved and energy is decreased

Momentum and kinetic energy are conserved in elastic collision

Simple pendulum does not depend on thermal expansion

Five alarms, Thermostat and Bimetallic thermometer are application of thermal expansion of solid

The range of temperature is between 35°C and 43°C but for normal temperature of human body is between the range of 35°C to 37°C respectively

Inertia: the property of a body that resists any change to its uniform motion, equivalent to its mass

Momentum and kinetic energy are conversed in elastic collision

F = 100HZ, period, T = 1/f = 1/100

= 0.01 sec

The period (T) = 0.01sec

General formular of Gas laws

(P₁V₁) ÷ T₁= (P₂V₂) ÷ T₂

P₁ = 800mmHg, V, = 76cm3, T_r = 273 + 27 = 300k

P₂ = 760mmHg, V₂ = ? T₂= 273 + 0 = 273 + 6 = 277k

(800 × 76) ÷ 300 = (760 × V₂) ÷ 273

V₂ = (300 × 76 × 273) ÷ (300 × 760) = 72.8 cm3

The volume of gas as S.T.P = 72.8 cm³