A body moving with an initial velocity U accelerates until it attains a velocity of V within a time t. The distance, s covered by the body is given by the expressions

• A. s = (\(\frac{v - u}{2}\))t
• B. s = (\(\frac{v + 2u}{2}\))t
• C. s = (\(\frac{v + u}{2}\))t
• D. s = (\(\frac{2v + u}{2}\))t

Water of mass 120g at 50°C is added to 200g of water at 10°C and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

• A. 60^oC
• B. 40^oC
• C. 25^oC
• D. 10^oC

The acceleration of a moving object can be determined from the?

• A. slope of its distance-time graph.
• B. area under its distance-time graph.
• C. slope of its velocity-time graph.
• D. area under its velocity-time graph

A body of mass m moving around a circle of radius r with a uniform speed v experiences a centripetal force F. The work done by the centripetal force on it is

• A. Fv
• B. zero
• C. Fmr
• D. Fr/m

Capacitors are used in the induction coil to

• A. control circuits
• B. prevent distortion of electric fields
• C. prevent electric sparks
• D. dissipate energy

The circuit diagram below is a simple current rectifier circuit. Use it to answer the questions that follow:

(a) State the function of each of the parts labelled A and B. Sketch the output signal produces.

In a solar panel for heat supply, state the function of each of the following parts: (a) metal flat plate; (b) thermal insulator: (c) tubes.

The volume of an air bubble increases from the bottom to the top of a lake at constant temperature because

• A. atmospheric pressure acts on the surface of the lake
• B. pressure increases with depth
• C. density remains constant with pressure
• D. the bubble experiences an upthrust

A glass block of thickness 10cm is placed on an object. If an observer views the object vertically, the displacement of the object is

• A. 3.33cm
• B. 5.00cm
• C. 6.67cm
• D. 8.50cm

A turning fork of frequency 340Hz is vibrated just above a cylindrical tube of height 1.2m. If water is slowly poured into the tube, at what maximum height will resonance occur. [speed of sound in air = 340ms-1]

• A. 0.95m
• B. 0.60m
• C. 0.50m
• D. 0.45m