The phenomenon that makes sound persist when its source has been removed is known as

• A. acoustic vibration
• B. rarefaction
• C. echo
• D. reverberation

When two flat plate conductors are arranged in such a way that they possess equal and opposite charges seperated by a dielectric, they form a/an

• A. electroscope
• B. electrophorus
• C. capacitor
• D. cell

In the curve below, PQRST represents an alternating voltage of frequency 50Hz. The time interval between points P and R on the graph is

• A. 25s
• B. 1/50s
• C. 1/100s
• D. 1/200s

At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that?

• A. P1 > P2
• B. P1 ? P2
• C. P1< P2
• D. P1 = P2

What type of motion does the skin of a 'talking' drum perform when it is struck with a drum stick?

• A. Random
• B. Rational
• C. Translational
• D. vibratory

Explain the rise of water in a glass capillary tube using the kinetic theory.

A narrow beam of white light can be split up into different Colours by a glass prism. The correct explanation is that

• A. white light Is an electromagnetic wave
• B. the prism has all the colours of the white light
• C. different colours of white light travel with different speeds in glass
• D. white light has undergone total Internal reflection in the prism

The graph of pressure (P) against the reciprocal of the volume (I/V) in Boyles's law is a?

• A. hyperbola
• B. parabola
• C. curve
• D. straight line

An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?

• A. The resultant of the parallel force is zero
• B. the algebraic sum of the moment of the forces is zero
• C. all the parallel forces must be equal in magnitude and in direction
• D. the sum of the forces in one direction must be equal to the sum of forces in the opposite direction

Which of the following has the same unit as the moment of a force?

• A. Force
• B. Power
• C. Work
• D. Momentum