Which of the following quantities is a vector?

• A. Volume
• B. Momentum
• C. Energy
• D. Speed

The image formed by a concave mirror is real, inverted and magnified, when object is placed

• A. at the focus
• B. at the centre of curvature
• C. beyond the centre of curvature
• D. between the centre of curvature and the focus

A bar AB is balanced horizontally on two knife edges as illustrated as in the diagram below. Determine the weight of the bar.

• A. 10.0N
• B. 20.0N
• C. 40.0N
• D. 50.0N

A ball falling through a viscous liquid is acted upon by

• A. upthrust only
• B. upthrust and the ball's weight
• C. the ball's weight and viscous force
• D. upthrust, the ball's weight and viscous force

A coin place below a rectangular glass block of thickness 9cm and refractive index 1.5 is viewed vertically above the block. The apparent displacement of the coin is

• A. 3 cm
• B. 5 cm
• C. 6 cm
• D. 8 cm

when a piece of rectangular glass block is inserted between two parallel capacitor,at constant plate area and distance of separation, the capacitance of the capacitor will

• A. increase
• B. decrease
• C. decrease then increase
• D. remain constant

A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is

• A. y = 0.15 sin 200π(x - 5.5t)
• B. y = 0.15 sin π(0.01x - 5.5t)
• C. y = 0.15 sin 5.5π(x - 200t)
• D. y = 0.15 sin π(550x - 0.01t)

(a) Explain (i) work: (ii) power

(b) Show that the efficiency E, the force ratio M.A. and the velocity ratio V.R. of a machine are related by the equation: E = M.A. x 100% V.R.

(c) An inclined plane of angle 15° is used raise a load of 4500N through a height of 2m. If the plane is 75% efficient calculate:

(i) velocity ratio of the plane;

(ii) work done on the load

(d) Explain Charles' law using the Kinetic theory of matter.

In the Rutherford scattering experiment, a beam of alpha particles was fired at a thin gold film with some of the particles being considerably deflected. This shows that

• A. a gold nucleus contains protons, neutrons and electrons uniformly distributed in a tiny volume
• B. the gold nucleus is positively charged and is concentrated in a tiny volume
• C. the gold nucleus emitted alpha particles
• D. the gold nucleus is concentrated in a tiny volume and contains alpha particles

An atom that emits an alpha-particle?

• A. may become a different element.
• B. becomes a different isotope of the element.
• C. daughter with increased mass.
• D. becomes a daughter of a different element always.