Waec Physics Past Questions For Year 1996
Question 6
The magnitude of the force required to make an object of mass M move with speed V in a circular path of radius R is given by the expression.
- A. mr/v
- B. (mr) 2/v
- C. mv2/r
- D. mv/2
- E. mv/r
Question 7
Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is
- A. 1 : 50
- B. 3 : 20
- C. 3:4
- D. 4:3
- E. 20:3
Question 8
The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms-2)
- A. 25N
- B. 90N
- C. 96N
- D. 250N
- E. 960N
Question 9
A rocket is launched from the surface of the earth. If the radius of the earth is 6.4 x 106m and the acceleration of free fall due to gravity is 1Oms-1 calculate the escape velocity of the rocket.
- A. 2.53 x 104ms-1
- B. 1.13 x 104ms
- C. 8.00 x 103ms-1
- D. 4.23 x 103ms-1
- E. 6.41 x 104ms-1
Question 10
The linear expansivity of a metal P is twice that of another metal Q. When these materials are heated through the same temperature change, their increase in length is the same. Calculate the ratio of the original length of P to that of Q.
- A. 1:4
- B. 1:2
- C. 2:1
- D. 4:1
- E. 6:1
