A resultant force of magnitude 15N acts on a body of mass 250g. Calculate the magnitude of the acceleration

• A. 0.06 ms^-2
• B. 3.75ms^-2
• C. 16.67ms^-2
• D. 60.00ms^-2

When two waves are superimposed on each other, the following occurrences are possible, except

• A. nodal lins
• B. anti nodal lines
• C. stationary waves
• D. dispersion

A girl stands on a scale in a lift. If the reading on the scale is less than her weight, then the lift is moving

• A. upward at uniform speed
• B. upward with uniform acceleration
• C. downward with uniform speed
• D. downward with uniform acceleration

In the formation of sea breeze. wind blows from

• A. sky to land
• B. sea to sky
• C. land to sea
• D. sea to land

Explain why it is desirable to install an air conditioner near the ceiling of a room and not close to the floor.

The S.I unit of heat is

• A. joule
• B. kelvin
• C. watt
• D. ampere

(a)

In the diagram illustrated, a body of mass m slides on an inclined plane. Show that the coefficient Mg of friction between the surfaces in contact is tan \(\theta\).

A spiral spring with a metal extends by 10.5 cm in air. When the metal is fully submerged in water, the spring extends by 6.8 cm. Calculate the relative density of the metal. (Assume Hooke's law is obeyed)

A metal sheet of area 100cm\(^2\) was heated through 70°C. Calculate its new area if the linear expansivity of the metal is 0.000017K\(^{-1}\).

• A. 100.06 cm²
• B. 100.12cm²
• C. 100.24cm²
• D. 100.36cm²

The magnetic relay is a device used for

• A. timing in sports
• B. storing magnetic field
• C. reading the magnitude of magnetic flux
• D. controlling another circuit carrying larger current

The time of flight for a projectile motion is given by the expression

• A. \(\frac{U sin \theta}{g}\)
• B. \(\frac{U sin \theta}{2g}\)
• C. \(\frac{2U sin \theta}{g}\)
• D. \(\frac{U sin 2\theta}{g}\)