Physics Past Questions And Answers
Local actions is normally prevented in a simple electric cell by
- A. introducing an oxidizing agent in the acid
- B. not drawing current continously for long period
- C. amalgamating the surface of the zinc plate
- D. using a porous pot to isolate the zinc plate from the acid
A transformer with 5500 turns in its primary winding is used between a 240V a.c supply and 120V kettle. Calculate the number of turns in the secondary winding
- A. 11000
- B. 2750
- C. 460
- D. 550
The diagram below illustrates a variation of the displacement y of a wave particle with time t. lf the velocity of wave is 250ms-1, calculate the distance between two successive particles which are in phase
- A. 20m
- B. 2.5m
- C. 3.0m
- D. 5.0m
In what range of temperature is the expansion of water anomalous?
- A. +208oC to +212oC
- B. -80oC + -76oC
- C. 0oC to +4oC
- D. -4oC to +0oC
The electrochemical equivalent of a metal is 1.3 x 10-7kgC-1. The mass of the metal which 2.0 x 104C of electricity will deposit from a suitable electrolyte is
- A. 6.5 x 10-2kg
- B. 2.6 x 10-2kg
- C. 6.5 x 10-3kg
- D. 2.6 x 10-3kg
A loaded spring is set in simple harmonic motion. The force that tends to restore the load to its equilibrium position is
- A. adhesive
- B. elastic
- C. frictional
- D. gravitational
In collision between two objects, kinetic energy is conserved only if
- A. one of the objects was initially at rest
- B. potential energy is converted to work
- C. the collision is inelastic
- D. the collision is elastic
Calculate the length which corresponds to a temperature of 20oC if the ice and steam points of an unguarded thermometer are 400 mm apart
- A. 20mm
- B. 30mm
- C. 60mm
- D. 80mm
As an object is moved close to the focus of a converging lens from infinity its image I. moves closer to the lens II. moves away from the lens. III. Remains the same size. IV becomes smaller. Which of the statements above is/are correct?
- A. III and IV only
- B. I and III only
- C. IV only
- D. II only
In the normal use of a simple microscope, a person sees an
- A. inverted, virtual and magnified image
- B. erect, virtual and magnified image
- C. erect, real and magnified image
- D. inverted, real and magnified image