A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum
- A. 4.0 m
- B. 3.0 m
- C. 2.0 m
- D. 1.5 m
The velocity y of a particle in a time t is given by the equation
y = 10 + 2t\(^2\)
Find the instantaneous acceleration after 5 seconds
- A. 60 ms-2
- B. 20 ms-2
- C. 15 ms-2
- D. 10 ms-2
In the series a.c circuit shown above, the p.d across the inductor is 8Vr.m.s and that across the resistor is 6Vr.m.s. The effective voltage is
- A. 2V
- B. 10V
- C. 14V
- D. 48V
In the diagram above, if the internal resistance of the cell is zero, the ration of the powers P1 and P2 dissipated by R1 and R2
- A. R2/R1
- B. R1/R2
- C. R1+R2/R1
- D. R1+R2/R2
In the circuit above, The potential across each capacitor is 100V. The total energy stored in the two capacitors is
- A. 3.0 x 104J
- B. 3.0 x 102J
- C. 2.5 x 10-2J
- D. 6.0 x 10-3J
In the circuit above, the ammeter reads a current of 5.0 A when R = 8Ω and reads 7.0A when R = 5Ω. The value of the unknown resistance X is
- A. 10.0Ω
- B. 7.5Ω
- C. 5.0Ω
- D. 2.5Ω
The diagram above shows a magnet X with its south pole moved along a soft – iron bar PQ in the direction shown. After some time, the poles at P and Q respectively are
- A. North - North
- B. North - South
- C. South - North
- D. South - South
The diagram above shows the prism arrangement in a
- A. binocular
- B. spectrometer
- C. periscope
- D. projector
The diagram above represents a transverse electromagnetic wave travelling with speed 3.0 x 108ms-1. What is the frequency of the wave.
- A. 3.0 x 107Hz
- B. 9.0 x 107Hz
- C. 1.0 x 109Hz
- D. 3.0 x 109Hz
In the J-tube above, Y and X are on the same horizontal level and 30cm3 of air is trapped above Y when the atmospheric pressure is 75cm Hg, calculate the volume of air trapped above Y when 15cm Hg is now poured into the limb above X
- A. 15 cm3
- B. 25 cm3
- C. 35 cm3
- D. 45 cm3
The diagram above shows a lift pump with valves at P and Q. During a downward stroke of the piston
- A. both valves are open
- B. P is open while Q is closed
- C. P is closed while Q is open
- D. Both valves are closed
The diagram above shows a solid figure with base PQ and center of gravity G on a inclined plane. Which of the following statements is correct
- A. The solid will fall over if the vertical line through G lies outside the base
- B. The solid will fall over if the vertical line through lies inside the base
- C. The solid will not fall over if the vertical line through G lies outside the base
- D. The solid can never fall over
The figure above represents a frictionless pulley system in which a weight W is in equilibrium with a weight of 40N. Find the value of W
- A. 13.3N
- B. 20.0N
- C. 40.0N
- D. 80.0N
The diagram above shows the velocity-time graph of a vehicle. Its acceleration and retardation respectively are
- A. 8.0 ms-2, 4,0 ms-2
- B. 4.0 ms-2, 8.0 ms-2
- C. 4.0 ms-2, 2.0 ms-2
- D. 2.0 ms-2, 4.0 ms-2
Vibration in a stretched spring cannot be polarized because they are
- A. stationary waves
- B. transverse waves
- C. longitudinal waves
- D. mechanical waves
the pressure of 3 moles of an ideal gas at a temperature of 27°C having a volume of 10-3m3 is
- A. 2.49 x 105-2
- B. 7.47 x 105-2
- C. 2.49 x 106-2
- D. 7.47 x 106-2
The phenomenon that makes sound persist when its source has been removed is known as
- A. acoustic vibration
- B. rarefaction
- C. echo
- D. reverberation
blowing air over a liquid aids evaporation by
- A. increasing its surface area
- B. decreasing its vapour pressure
- C. increasing its temperature
- D. decreasing its density
a ray of light which strikes a glass slab from air at normal incidence passes through the slab
- A. undeviated and undisplaced at a lower speed
- B. deviated and undisplaced at a lower speed
- C. deviated and displaced at a lower speed
- D. undeviated and displaced at a faster speed
water is a poor thermometric liquid because it
- A. is opaque
- B. is a poor conductor
- C. wets glass
- D. has low vapour pressure
A concave mirror of radius of curvature 40 cm forms a real image twice as large as the object.
the object distance is
- A. 10 cm
- B. 30 cm
- C. 40 cm
- D. 60 cm