A process by which two light atoms join to form a new atom of higher atomic mass is
- A. natural radioactivity
- B. nuclear fission
- C. nuclear fusion
- D. chain reaction
Beta particles are faster-moving
- A. protons
- B. electrons
- C. neutrons
- D. photons
Which of the following statements is not a reason for using soft iron in making the core of a transformer? It
- A. retains its magnetism for a long time
- B. is easily magnitised
- C. reduces energy loss due to hysteresis
- D. is easily demagnetised
Which of the following statements is an advantage of nuclear fusion over nuclear fission?
- A. The resulting chain reaction which produces large amount of energy
- B. no radioactve wave is produced as bye product
- C. very high temperature is required in the process
- D. the end product is lead
an electric motor is a machine that converts
- A. mechanical energy into electrical energy
- B. electrical energy into mechanical energy
- C. high voltage to low voltage
- D. low voltage to high voltage
A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when
- A. the magnet is moved away from the stationary solenoid
- B. the solenoid is moved away from the stationary magnet
- C. the magnet is moved towards the stationary solenoid
- D. there is no relative motion between the magnet and the solenoid
Lenz’s law of electromagnetic induction states that
- A. a force is exerted on a current-carrying conductor in a magnetic field
- B. electromotive force id induced in a circuit whenever there is a change in the magnetic flux linked with the circuit
- C. the magnitude of the induced electromotive force in a circuit is proportional to the rate of change of flux linking the circuit
- D. the induced current in a coil is in such a direction that it sets up a magnetic field which opposes the change producing it
The mass and weight of a body on earth are 8kg and 80N respectively. Determine the mass and weight of the body respectively on a planet where the pull of gravity is \(\frac{1}{8}\) that on earth
- A. 8kg, 8N
- B. 1kg, 10N
- C. 64kg, 10N
- D. 8kg, 10N
A constantan wire has a cross sectional area of 4 x 10-8m2 and a resistivity of 1.1 x 10-6\(\Omega\)m. If a resistor of resistance 11\(\Omega\) is to be made from this wire, calculate the length of the wire required
- A. 0.4m
- B. 0.8m
- C. 2.5m
- D. 5.0m
Which of the following statements explains lost volt in an electric circuit? The
- A. total p.d from a source to maintain a flow of current through the circuit as well as the source
- B. p.d to drive current through the circuit component except the source
- C. p.d across all external components connected to the source of electricity
- D. p.d across the internal resistance of the cell
An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?
- A. N7.20
- B. N18.00
- C. 180.00
- D. N720.00
a chemical cell of internal resistance 1\(\Omega\) supplies electric current to an external resistor of resistance 3\(\Omega\). Calculate the efficiency of the cell
- A. 75%
- B. 50%
- C. 33%
- D. 25%
A parallel plate capacitor of capacitance 600\(\mu F\) has a potential difference of 200V between its plates. Calculate the charge on either plate of the capacitor
- A. 1.2C
- B. 3.3C
- C. 3330.0C
- D. 12.0000.0C
A parallel plate capacitor of capacitance 600\(\mu F\) has a potential difference of 200V between its plates. Calculate the charge on either plate of the capacitor
- A. 1.2C
- B. 3.3C
- C. 3330.0C
- D. 12.0000.0C
Two capacitors if capacitance 0.4\(\mu F\) and 0.5\(\mu F\) are connected in parallel and charged to a p.d. of 50V, Determine the total charge acquired
- A. 45\(\mu C\)
- B. 25\(\mu C\)
- C. 20\(\mu C\)
- D. 10\(\mu C\)
The ability of a material to store an electric charge when its plates are at different potentials is referred to as its
- A. conductance
- B. inductance
- C. capacitance
- D. resistance
In which of the following media is the transmission of sound wave fastest?
- A. Vacuum
- B. Air
- C. Wood
- D. Iron
A ray of light is incident normally on a plan mirror. If the incident ray is kept fixed while the mirror is rotated through an angle of 30o, determine the initial and final angles of reflection respectively
- A. 0o and 60o
- B. 90o and 30o
- C. 0o and 30o
- D. 90o and 60o
Which of the following optical instruments does not depend on the use of plane mirrors?
- A. kaleidoscope
- B. simple microscope
- C. sextant
- D. simple periscope
The amplitude of a wave is the
- A. distance travelled by the wave in a complete cycle of its motion
- B. maximum diplacement of the wave particle from the equilibrum position
- C. separation of two adjacent particles vibrating in a phase
- D. distance between two successive troughs of the wave
Radio waves travel in air at 3.0 x 108ms-1. If the waves enter water of refractive index \(\frac{4}{3}\), calculate the speed of radio waves in water
- A. 4.33 x 108ms-1
- B. 4.00 x 108ms-1
- C. 2.25 x 108ms-1
- D. 1.33 x 108ms-1