Am elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of the string is
- A. 12cm
- B. 20cm
- C. 18cm
- D. 15cm
If two inductors of inductances 3H and 6H are arranged in series, the total inductance is
- A. 9.0H
- B. 18.0H
- C. 0.5H
- D. 2.0H
A force of 200N acts between two objects at a certain distance apart. The value of the force when the distance is halved is
- A. 400N
- B. 200N
- C. 100N
- D. 800N
The velocity of sound in air will be doubled if it’s absolute temperature is
- A. Quadrupled
- B. Constant
- C. Halved
- D. Doulbed
If the distance between two point charges its increased by a factor of four, the magnitude of the electrostatic force between them will be
- A. 1/4 of its former value
- B. 1/16 of its former value
- C. 1/2 of its former value
- D. 4 times its former value
The figure above shows three capacitors, 2μF, 3μF and 6μF connected in series. If the p.d across the system is 12V, the p.d, across the 6μF capacitor is
- A. 4V
- B. 12V
- C. 2V
- D. 6V
106J of heat is required to boil off completely 2kg of a certain liquid. Neglecting heat lost to the surroundings, the latent heat of vaporization of the liquid is
- A. 2.0 x 106J kg-1
- B. 5.0 x 106J kg-1
- C. 2.0 x 105J kg-1
- D. 5.0 x 105J kg-1
Two liquids L1 and L2 are contained in a U – tube. The height and the density of L1 are 8 cm and 103 kgm-3 respectively. If the density of L2 is 800 kgm-3, its height measured from the same level is
- A. 8 cm
- B. 10 cm
- C. 16 cm
- D. 12 cm
\( ^{235} _{92}U + ^1 _0n → ^{144} _{56}Ba + ^{90} _{36}Kr +2X \)
In the reaction above, X is
- A. electron
- B. proton
- C. neutrino
- D. neutron
In the circuit diagram of a transistor above, the terminal P, Q and R represent
- A. EMITTER, BASE and COLLECTOR
- B. COLLECTOR, EMITTER and BASE
- C. BASE, COLLECTOR and EMITTER
- D. BASE, ENITTER and COLLECTOR
In the figure above, the work done by the force of 100N inclined at an angle of 60o to the object dragged horizontally to a distance of 8m is
- A. 800J
- B. 600J
- C. 100J
- D. 400J
If the system above is in equilibrium, the tension in the string Q is
- A. 11N
- B. 9N
- C. 4N
- D. 6N
In the figure above, the coefficient of static friction is 0.5. If the tension in the string is T, the acceleration of the system in motion is
- A. 5 ms-2
- B. 15 ms-2
- C. 3 ms-2
- D. 9 ms-2
The value of F in the figure above when in equilibrium is
- A. 10N
- B. 12N
- C. 20N
- D. 27N
The figure above shows a plot of angles of deviation through a glass prism when light is incident at θ degrees on the prism. The incident angle that produces the minimum deviation is
- A. 20o
- B. 18o
- C. 35o
- D. 25o
The resistance of a piece of wire of length 20m has crossed-sectional area 8 x 10\(^{-6}\)m\(^2\)is?
[Resistivity of the wire = 4 x 10\(^{-7}\) Ω m]
- A. 5.0 Ω
- B. 0.5 Ω
- C. 10.0 Ω
- D. 1.0 Ω
Two charged particles are projected into a region where there is a magnetic field perpendicular to their velocities. if the charges are deflected in opposite directions, which of the following statements is true of the charge?
- A. the charge must be of opposite sign
- B. positive charges are more in number
- C. the charges are electrically neutral
- D. the charges are of the same sign
The electric field intensity in a place where a charge of 10-10c experiences a force of 0.4N is?
- A. 4.0 x 107 NC-1
- B. 8.0 x 109 NC-1
- C. 8.O x 10-12 NC-1
- D. 4.0 x 109 NC-1
A car battery rated 45 A H is charged with a charger whose rating is 2.5A.How long will it take to charge the battery full?
- A. 10 hrs
- B. 18 hrs
- C. 20 hrs
- D. 25 hrs
The north pole of a magnet can never be separated from the south pole because of the property knowledge as?
- A. magnetic octopole
- B. magnetic monopole
- C. magnetic dipole
- D. magnetic quadrupole
An electric device is rated 2000 W, 250 v. The correct fuse rating of the device is?
- A. 9 A
- B. 8 A
- C. 6 A
- D. 7 A