Physics Past Questions And Answers
(a) Define Young modulus of elasticity;
(b) A spiral spring extends from a length of 10.0 cm to 10.01 cm when a force of 20 N is applied on it. Calculate the force constant of the spring.
View Discussion (0)WAEC 2002 THEORYAn object of mass 50kg is released from a height of 2m.Find the kinetic energy just before it strikes the ground
- A. 250J
- B. 1000J
- C. 10 000J
- D. 100 000J
A 100kg box is pushed along a road with force of 500N. If the box moves with a uniform velocity, the coefficient of friction between the box and the road is
- A. 0.4
- B. 1.0
- C. 0.8
- D. 0.5
A parallel plate capacitor is charged and the charging battery is subsequently disconnected. lf the plates of the capacitor are moved farther apart by means of insulating handles, the
- A. capacitance would increase
- B. capacitance would decrease
- C. charge on the capacitor would increase
- D. charge on the capacitor would decrease
Which of the following quantities is a vector?
- A. speed
- B. distance
- C. energy
- D. momentum
An object of mass 100g projected vertically upwards from the ground level has a velocity of 20ms-1 at a height of 10m. calculate its initial kinetic energy at the ground level.[g = 10ms-2, neglect air resistance]
- A. 10 J
- B. 20 J
- C. 30 J
- D. 50 J
Which of the following statements is not true?
- A. Musical notes consist of the combination of sounds of regular frequency
- B. The combination of overtones produced by an instrument determines the quality of the sound
- C. the loudness of sound is determined by its frequency
- D. the pitch of a note depends on the frequency of vibration of the source
Which of the following statements about a spring balance and/or a chemical balance is not correct?
- A. the chemical balance operates on the principle of moments
- B. the sprin balance operates on Hooke's law
- C. either may be used to measure the weight of a substance
- D. the reading of a spring balance changes over the surface of the earth, while that of the chemical balance remaind constant
A body is under action of a force F such that the force displacement graph of the body is semi circular as shown below. The work done on the body by the force in moving through 24 meters is
- A. 36π J
- B. 72π J
- C. 144π J
- D. 288π J
In which of the following media would sound wave travel fastest?
- A. wood
- B. water
- C. iron
- D. mercury