A handbag containing some load weighing 162N is carried by two students each holding the handle of the bag next to him. If each handle is pulled \( 60^{\circ} \) to the vertical, find the force on each student’s arm
- A. 81N
- B. 121N
- C. 162N
- D. 324N
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
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
Light of energy 5eV falls on a metal of work function 3eV and electrons are liberated. The stopping potential is
- A. 1.7V
- B. 2.0V
- C. 8.0V
- D. 15.0V
A conductor of length 2m carries a current of 0.8A while kept in a magnetic field of magnetic flux density 0.5T. The maximum force acting on it is
- A. 0.2N
- B. 0.8N
- C. 3.2N
- D. 8.0N
A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is
- A. 25%
- B. 33%
- C. 50%
- D. 75%
A 2H inductor has negligible resistance and is connected to a 50/π Hz A.C. Supply. The reactance of the inductor is
- A. 200 Ω
- B. 50 Ω
- C. 100/π Ω
- D. 25/π Ω
A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are
- A. beta rays
- B. gamma rays
- C. x-rays
- D. ultra-violet rays
If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?
- A. 24 years
- B. 20 years
- C. 10 years
- D. 2 years
If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?
[e = 1.6 x 10\(^{19}\)C, h = 6.63 x 10\(^{-34}\)Js]
- A. 6630.0V
- B. 663.0V
- C. 66.3V
- D. 6.6V