Question Library

The volume of object is the same as the volume of liquid displaced in a container such as measuring cylinder.

Colours presented by objects are the ones reflected

From two parts 20m apart a = 10m, x = 6m, A = 5 V = \omega\(\sqrt{A^2 - X^2}\) = 5\(\sqrt{10^2 - 6^2}\) = 40m/s

Potential energy = mgh = (mg)h = force \times distance ⇒ 0 \times d = 0

ρ\(_m\)h\(_m\) = ρ\(_a\)h\(_a\) 13.6(760 - p) \times 10\(^{-3}\) = 13 \times 10\(^{-5}\)(20 \times 10\(^3\)) 760 - p = 13 \times 10\(^{-5}\) \times 20 \times 10\(^{3}\) 13.6 \times 10\(^{-3}\) = 19.12 \times 10\(^{1}\) 760 - p = 191.2 p = 760 - 191.2 ≈ 570mmHg

½Ke\(^{2}\) = ½mv\(^{6}\) ½ x 200 x (0.05)\(^{2}\) = ½ x 0.02 x v\(^{2}\) v\(^{2}\) = 25 v = 5 m s\(^{-1}\)

The expected answer is (a) Identification of labelled physical quantities P - initial velocity/ velocity of projection b - angle of projection H - maximum height reached R - range/horizontal distance (covered) (b) Equation showing relationship between P, g and Rmax Rmax = \(\frac{p^2}{g}\)

Observable phenomena in which waves behave like a particle - reflection; - refraction; - diffraction; - polarization; - interference; - Compton effect; - blackbody radiation

Magnetic elements that determine the earth’s magnetic field at a point - Angle of dip/inclination - angle of declination/variation - horizontal component of the earth’s magnetic field

Explanation of terms (a) Free electrons; Negative charge carriers (b) Holes; Positive charge carriers

In unstable equilibrium, when the cone is disturbed, it tends to fall further from its equilibrium position, leading to a decrease in height and thus an increase in potential energy.

\omega = 2\piF = 2\pi \times 2 = 4\pirad\(^{-1}\) Centripetal force = mr\omega\(^2\) ⇒ 0.5 \times 2 \times (4\pi)\(^2\) ⇒ 157.75N Approximately = 158N.

Stable equilibrium brings about increase in potential energy as the height rises after displacement.

Meter rule has a reading accuracy of 0.5mm or 0.05cm, thus measurement is M \pm 0.05cm i.e 2.00, 2.05, 2.50, 2.55 etc. The reading that cannot be read is 2.56cm.

This is the correct graph. The graph is volume against temperature where temperature is in Celsius.