The diagram above show s the force-extension curve of a piece of wire. The energy stored when the wire is stretched from E to F is?
- A. 7.5 x 10-3J
- B. 2.5 x 10-3J
- C. 1.5 x 10-2J
- D. 7.5 x 10-1J
In the diagram above, determine the r.m.s current
- A. 31A
- B. 48A
- C. 60A
- D. 80A
In the circuit diagram above , the ammeter reads a current of 3A when R is 5Ω and 6A when R is 2Ω. Determine the value of x
- A. 8Ω
- B. 2Ω
- C. 10Ω
- D. 4Ω
The diagram above shows a closed side 0.5m in a uniform electric field E in the direction shown by the arrows. What is the flux Φ for the box?
- A. 0.5 E
- B. 2.0 E
- C. 0.2 E
- D. 0.0 E
The diagram above shows the capacitors C1, C2 and C3 2μF, 6μF and 3μF respectively. The potential difference across C1, C2 and C3 respectively are
- A. 4V, 6V and 2V
- B. 2V, 6V and 4V
- C. 6V, 4V and 2V
- D. 6V, 2V and 4V
The diagram above shows two capacitors P and Q of capacitance 2μF and 4μF respectively connected to a d.c source. The ratio of energy stored in P to Q is
- A. 4:1
- B. 2:1
- C. 1:4
- D. 1:2
In the diagram above , the current I is
- A. 3/8
- B. 9/11
- C. 11/9
- D. 8/3
If ray travelling in air is incident on a transparent medium as shown in the diagram, the refractive index of the medium is given as
- A. cosα / sinβ
- B. sinα / sinβ
- C. cosβ / sinα
- D. sinβ / sinα
The diagram above is a block and tackle pulley system in which an effort of 80N is use to lift a load of 240N. The efficiency of the machine is
- A. 60%
- B. 50%
- C. 40%
- D. 33%
In the diagram above, which of the simple pendula will resonate with P when set into oscillation
- A. T
- B. U
- C. R and T
- D. Q and R
In the a.c circuit above, the current value is
- A. 0.58 A
- B. 3.00 A
- C. 4.00 A
- D. 6.67 A
If current flows in the direction of the arrows in the solenoid above, the north pole is at
- A. P
- B. Y
- C. X
- D. Q
The correct position for a fuse in the diagram above is
- A. between P and Q
- B. Q
- C. S
- D. P
In the diagram above, the values of V1 and V2 are respectively
- A. 1V and 1/3V
- B. 1/3V and 1V
- C. 1/3V and 2/3V
- D. 1V and 2/3V
In the diagram above a beam of white light travels from a rare to a dense medium. What colours of light do the rays a, b and c respectively represents?
- A. red, green and blue
- B. Green, red and blue
- C. Yellow , blue and red
- D. Blue , yellow and red
The diagram above shows two capacitors P and Q of capacitance 5μF and 10μF. Find the charges stored in P and Q respectively
- A. 2μC and 4μC
- B. 4μC and 2μC
- C. 100μC and 200μC
- D. 200μC and 100μC
The diagram above shows a maximum and minimum thermometer divided into three portions P, Q and R. Which of the following is true about the respective content of P,Q and R
- A. Alcohol, mercury and alcohol
- B. Air, alcohol and mercury
- C. Mercury, alcohol and mercury
- D. Air, mercury and alcohol
An engineer intends to deviate a light ray from its path by 120o through reflection from a plane mirror. Calculate the angle of incidence
- A. 60o
- B. 40o
- C. 30o
- D. 20o
A transverse wave is applied to a string whose mass per unit length is 3 x 10-2kgm-1. If the string is under a tension 12N, the speed of the propagation of the wave is
- A. 5 ms-1
- B. 20 ms-1
- C. 30 ms-1
- D. 40 ms-1
A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is
- A. y = 0.15 sin 200π(x - 5.5t)
- B. y = 0.15 sin π(0.01x - 5.5t)
- C. y = 0.15 sin 5.5π(x - 200t)
- D. y = 0.15 sin π(550x - 0.01t)
A sonometer wire is vibrating at frequency fo. If the tension in the wire is doubled while the length and the mass per unit length are kept constant, the new frequency of vibration is
- A. fo/2
- B. 2fo
- C. fo/√2
- D. fo√2